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NSTS Bancorp, Inc.

For the period ended Jun 30, 2026. Filed Aug 13, 2026.

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About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Jun 30, 2026 · Filed Aug 13, 2026

NSTS$14.26+0.5%Stored close · as of Sep 30, 2026

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NOTES TO THE UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

Note1: Summary of Significant Accounting Policies

The accompanying unaudited consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and conform to practices within the banking industry. The accounting policies followed in the preparation of the interim consolidated financial statements are consistent with those used in the preparation of the annual financial statements. The interim consolidated financial statements reflect all normal and recurring adjustments that are necessary, in the opinion of management, for fair statement of results for the interim periods presented. Results for thethree andsix month periods ended* June 30, 2026*, arenot necessarily indicative of the results that* maybe expected for the year ending December**31,* 2026.

Nature of Operations

NSTS Bancorp, Inc. (“NSTS” or the “Company”, “we” or “our”) was formed to serve as the stock holding company for North Shore Trust and Savings (the “Bank”) in connection with the conversion of North Shore Trust and Savings, NSTS Financial Corporation and North Shore MHC, into the stock form of organization, which was completed on* January 18, 2022.Shares of NSTS Bancorp, Inc. stock began trading on January 19, 2022*on the Nasdaq Capital Market under the trading symbol "NSTS."

The Bank operates primarily out ofthree bank branch locations in the northern suburbs of Chicago, Illinois. The Bank offers a variety of financial services to customers in our surrounding communities. Financial services consist primarily of1-4 family mortgage loans, savings accounts, and certificate of deposit accounts. There areno significant concentrations of loans to anyone industry or customer. The Bank’s exposure to credit risk is significantly affected by changes in the economy in the Bank’s market area. During the quarter ended* June 30, 2026,and as announced on June 4, 2026,the Bank divested its mortgage lending division, Oak Leaf Community Mortgage ("OLCM"), which operated inthree* locations in the north and western suburbs of Chicago. As of* June 30, 2026,13 employees areno longer with the Company. An additionalthree employees left prior to, or on, August 3, 2026.*

Basis of Presentation

The accompanying unaudited Consolidated Financial Statements were prepared in accordance with GAAP and the instructions to Form10-Q and Rule10-01 of Regulation S-X. Accordingly, they donot include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with NSTS Bancorp, Inc.’s Consolidated Financial Statements and footnotes thereto included in the Company’s Annual Report on Form10-K for the year ended* December 31, 2025*. The unaudited Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

Management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results* mayvary from those estimates. Material estimates that could significantly change in the near-term include the adequacy of the allowance for credit losses, determination of the valuation allowance on deferred tax assets and the valuation of investment securities and the related tax effect. The results of operations for thethree* andsix months ended* June 30, 2026*, arenot necessarily indicative of results that* maybe expected for any other interim period or the entire fiscal year ending December 31, 2026.*Certain amounts in prior year financial statements have been reclassified to conform to the current presentation.No significant subsequent events have occurred through this date requiring adjustment to the financial statements or disclosures.

All of the Company’s financial results are similar and considered by management to be aggregated intoone reportable operating segment. While the Company has assigned certain management responsibilities by business-line, the Company’s Chief Operating Decision Maker ("CODM") evaluates financial performance on a Company-wide basis. The Company's assigned business lines have similar economic characteristics, products, services and customers. Accordingly, all of the Company’s operations are considered by management to be aggregated inone reportable operating segment.

Financial performance is reported to the CODM monthly, and the primary measure of performance is consolidated net income. The allocation of resources throughout the Company is determined annually based upon consolidated net income performance. The presentation of financial performance to the CODM is consistent with amounts and financial statement line items shown in the Company's consolidated balance sheets and consolidated statements of operations. Additionally, the Company's significant expenses are adequately segmented by category and amount in the consolidated statements of operations to include all significant items when considering both qualitative and quantitative factors. Significant expenses of the Company include salaries and employee benefits, equipment and occupancy expense, data processing, professional services and advertising.

In* November 2024,the FASB issued ASUNo.* 2024-03, “Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic220-40).” The pronouncement requires public entities to disclose additional information about specific expense categories in the notes to the financial statements. The guidance is effective for public business entities for fiscal years beginning after* December 15, 2026,and interim reporting periods beginning after December 15, 2027.Early adoption is permitted. The Company is assessing ASU2024*-03 and its impact on its Consolidated Financial Statements and disclosures, and doesnot expect the amendments to have a material impact to the annual financial statements of the Company.

8

Proposed Merger with Brookfield Bancshares, Inc.

As previously disclosed, on* May 12, 2026,*Brookfield Bancshares, Inc. ("Parent") and the Company entered into an Agreement and Plan of Merger (the "Merger Agreement"), pursuant to which (1) the Company will merge with and into a newly formed Delaware corporation and wholly owned subsidiary of Parent, BRKD Merger Sub Inc. ("Parent Merger Sub"), with the Company as the surviving corporation (the "Merger') and (2) immediately following the Merger, the Company will be merged with and into Parent, with Parent surviving the merger (the "Second Merger"). Following the Second Merger, the Bank will become a wholly owned subsidiary of Parent. The Bank will continue to operate under its existing name and federal savings association charter as a subsidiary of Parent.

Under the terms of the Merger Agreement, each share of common stock, par value $0.01 per share, of the Company (“Company Stock”) that is issued and outstanding at the effective time of the Merger (the “Effective Time”), will be converted into the right to receive cash in an aggregate amount equal to $73,662,000 (the “Merger Consideration”), or approximately $14.28 per share of outstanding Company Stock, calculated based on fully diluted shares net of ESOP shares repurchased upon the repayment of the loan. In addition, all shares of restricted stock of the Company granted under the NSTS Bancorp, Inc.2023 Equity Incentive Plan (the “Plan”), whether ornot vested, will vest at the Effective Time and be entitled to receive the Merger Consideration. All stock options granted under the Plan, whether ornot vested, will vest at the Effective Time and be entitled to receive a cash payment equal to the difference between the option’s exercise price and the per share Merger Consideration, to be paid out of the aggregate Merger Consideration.

Consummation of the Merger is subject to certain conditions, including, among others, approval of the Merger and the Merger Agreement by the Company’s stockholders, the receipt of all required regulatory approvals and expiration of applicable waiting periods, accuracy of specified representations and warranties of each party, the performance in all material respects by each party of its obligations under the Merger Agreement, and the absence of any injunctions or other legal restraints. The transaction is anticipated to close in thefourth quarter of2026.

9

Note2: Securities Available for Sale

The amortized cost and estimated fair value of debt securities at* June 30, 2026* and* December 31, 2025*, by contractual maturity, are shown below. Theaccrued interest receivable for securities available for sale was $315,000 and $326,000 on* June 30, 2026* and* December 31, 2025,respectively. Maturities maydiffer from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may*be called or repaid without any penalties, therefore, these securities have been included in the below table based on average remaining life.

June 30, 2026U.S. Treasury notesU.S. government agency obligationsMunicipal obligationsMortgage-backed residential obligationsCollateralized mortgage obligationsTotal available-for-sale
(Dollars in thousands)
1 year or less$1,001$—$119$—$5,728$6,848
1 to 5 years6,0197,7851,2068,00613,35536,371
5 to 10 years—3684,62213,1924,59022,772
After 10 years——6,0815532,0028,636
Fair value7,0208,15312,02821,75125,67574,627
Gross unrealized gains——————
Gross unrealized losses(87)(718)(1,842)(3,099)(2,620)(8,366)
Amortized cost$7,107$8,871$13,870$24,850$28,295$82,993
December 31, 2025U.S. Treasury notesU.S. government agency obligationsMunicipal obligationsMortgage-backed residential obligationsCollateralized mortgage obligationsTotal available-for-sale
(Dollars in thousands)
1 year or less$—$—$198$—$1,412$1,610
1 to 5 years7,0857,2081,2028,86017,75742,112
5 to 10 years—1,3263,64214,3365,91825,222
After 10 years——7,1045732,0989,775
Fair value$7,085$8,534$12,146$23,769$27,185$78,719
Gross unrealized gains4———15
Gross unrealized losses(7)(685)(1,829)(2,990)(2,552)(8,063)
Amortized cost$7,088$9,219$13,975$26,759$29,736$86,777

As of* June 30, 2026*, and* December 31, 2025*, no securities were pledged to secure public deposits or for other purposes as required or permitted by law.

Information pertaining to securities with gross unrealized losses at* June 30, 2026* and* December 31, 2025*, aggregated by investment category and length of time that individual securities have been in a continuous loss position, is as follows:

Less than 12 Months · 12 Months or Longer · Total
(Dollars in thousands)
FairUnrealizedFairUnrealizedFairUnrealized
ValueLossesValueLossesValueLosses
U.S. Treasury notes$7,020$87$—$—$7,020$87
U.S. government agency obligations986147,1677048,153718
Municipal obligations——12,0281,84212,0281,842
Mortgage-backed residential obligations——21,7513,09921,7513,099
Collateralized mortgage obligations2,4654923,2102,57125,6752,620
Total$10,471$150$64,156$8,216$74,627$8,366
U.S. Treasury notes$2,990$7$—$—$2,990$7
U.S. government agency obligations1,00017,5346848,534685
Municipal obligations——12,1461,82912,1461,829
Mortgage-backed residential obligations——23,7692,99023,7692,990
Collateralized mortgage obligations1,5302424,6542,52826,1842,552
Total$5,520$32$68,103$8,031$73,623$8,063

10

At* June 30, 2026* and* December 31, 2025*, many of the investment securities were in unrealized loss positions. There wereno securities with identified credit losses at* June 30, 2026* and* December 31, 2025*, respectively. Unrealized losses havenot been recognized into income because, based on management's evaluation, the decline in fair value is largely due to increased market rates, temporary market conditions and trading spreads, and, as such, are considered to be temporary by the Bank. In addition, management has the intent and ability to hold the securities until they mature or they recover their carrying values.

All U.S. government agency obligations, mortgage-based residential obligations and collateralized mortgage obligations are agency-issued or government-sponsored enterprise issued. Agency-issued securities are generally guaranteed by a U.S. government agency, such as the Government National Mortgage Association. Government-sponsored enterprises, such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, or the Small Business Administration, have either a direct or implied guarantee by the U.S. government.

The Bank holdstwo classifications of municipal bonds, general obligation bonds and revenue bonds. General obligation bonds are backed by the general revenue of the issuing municipality, while revenue bonds are supported by a specific revenue source. All general obligation and revenue bonds have a bond rating of investment grade by Standard and Poor's or Moody's Investor Services or arenot rated. There have beenno declines in investment grades on bonds in a loss position and, as of* June 30, 2026*, all municipal bonds are paying as agreed.

There wereno sales of securities available-for-sale during thesix months ended* June 30, 2026* and2025.

Note3: Loans and allowance for credit losses

A summary of loans by major category as of* June 30, 2026* and* December 31, 2025* is as follows:

June 30, 2026December 31, 2025
(Dollars in thousands)
First mortgage loans
1-4 family residential$116,514$118,222
Multi-family3,7753,240
Commercial3,8463,813
Construction3,0203,921
Total first mortgage loans127,155129,196
Consumer loans312268
Total loans127,467129,464
Net deferred loan costs156299
Allowance for credit losses on loans(1,095)(1,128)
Total loans, net$126,528$128,635

First mortgage loans serviced and subserviced for others arenot included in the accompanying Consolidated Balance Sheets. The unpaid principal balance of these loans totaled $40.0 million and $41.0 million at* June 30, 2026* and* December 31, 2025*, respectively. Custodial escrow balances maintained in connection with the loans serviced were $529,000 and $480,000 at* June 30, 2026* and* December 31, 2025*, respectively.

The accrued interest receivable for loans, net, was $541,000 and $577,000 for* June 30, 2026* and* December 31, 2025,*respectively

In the normal course of business, loans are made by the Bank to directors and officers of the Company and the Bank (related parties). The terms of these loans, including interest rate and collateral, are similar to those prevailing for comparable transactions with other customers and donot involve more than a normal risk of collectability. At* June 30, 2026* and* December 31, 2025*, such borrowers were indebted to the Bank in the aggregate amount of $414,000 and $564,000, respectively.

11

The following tables present the activity in the allowance for credit losses ("ACL") for thethree andsix months ended* June 30, 2026* and2025:

1-4 family
residentialMulti-familyCommercialConstructionConsumerTotal
(Dollars in thousands)
Three months ended
Beginning balance$956$39$34$63$3$1,095
Charge-offs——————
Recoveries——————
Net recoveries (charge-offs)——————
Provision for (release of) credit losses1153(19)——
Ending balance$967$44$37$44$3$1,095
1-4 family
residentialMulti-familyCommercialConstructionConsumerTotal
(Dollars in thousands)
Six months ended
Beginning balance$989$39$37$61$2$1,128
Charge-offs——————
Recoveries——————
Net recoveries (charge-offs)——————
(Release of) provision for credit losses(22)5—(17)1(33)
Ending balance$967$44$37$44$3$1,095
1-4 family
residentialMulti-familyCommercialConstructionConsumerTotal
(Dollars in thousands)
Three months ended
Beginning balance$1,034$37$38$45$2$1,156
Charge-offs——————
Recoveries——————
Net recoveries (charge-offs)——————
Provision for credit losses22—616—44
Ending balance$1,056$37$44$61$2$1,200
1-4 family
residentialMulti-familyCommercialConstructionConsumerTotal
(Dollars in thousands)
Six months ended
Beginning balance$1,056$37$41$65$2$1,201
Charge-offs——————
Recoveries——————
Net recoveries (charge-offs)——————
Provision for (release of) credit losses——3(4)—(1)
Ending balance$1,056$37$44$61$2$1,200

The ACL on loans excludes the allowance for off-balance sheet exposures as of* June 30, 2026* and2025, respectively, recorded within Other Liabilities on the Consolidated Balance Sheets. Off-balance sheet exposures consist of unused lines of credit, the unused portion of construction loans and commitments to originate loans. The following tables present the activity in the ACL for off-balance sheet exposures for thethree andsix months ended* June 30, 2026* and2025:

Off-balance sheet exposures
(Dollars in thousands)
Three months ended June 30,Six months ended June 30,
2026202520262025
Beginning balance$46$67$40$59
Provision for credit losses113721
Ending balance$47$80$47$80

12

As of* June 30, 2026*, there weresix collateral dependent loans totaling $2.4 million in theone tofour-family residential loan segment. These loans are collateralized by residential real estate and haveno ACL as of* June 30, 2026.As of December 31, 2025,there weretwo* collateral dependent loans totaling $284,000 in theone tofour-family residential loan segment. These loans are collateralized by residential real estate and haveno ACL as of* December 31, 2025.There wereno other collateral dependent loans as of June 30, 2026and December 31, 2025.*

The Bank evaluates collectability based on payment activity and other factors. The Bank uses a graded loan rating system as a means of identifying potential problem loans, as follows:

Pass

Loans in these categories are performing as expected with low to average risk.

Special Mention

Loans in this category are internally designated by management as “watch loans.” These loans are starting to show signs of potential weakness and are closely monitored by management.

Substandard

Loans in this category are internally designated by management as “substandard.” Generally, a loan is considered substandard if it is inadequately protected by the paying capacity of the obligors or the current net worth of the collateral pledged. Substandard loans present a distinct possibility that the Bank will sustain losses if such weaknesses arenot corrected.

Doubtful

Loans classified as doubtful have all the weaknesses inherent in those designated as “substandard” with the added characteristic that the weaknesses* may*make collection or liquidation in full, on the basis of currently existing facts, highly questionable and improbable.

On an annual basis, or more often if needed, the Bank formally reviews the ratings on commercial loans. In addition, the Bank performs an independent review of a significant portion of the commercial loan portfolio. Management uses the results of the independent review as part of its annual review process.

13

The following tables present the credit risk profile of the Company's loan portfolio based on risk rating category and year of origination as of* June 30, 2026* and* December 31, 2025*.

Term loans amortized cost basis by origination year
20262025202420232022PriorRevolving loans amortized cost basisRevolving loans converted to term loans amortized cost basisTotal
(Dollars in thousands)
1-4 family residential
Pass$9,097$12,233$11,408$12,305$10,113$51,525$7,422$—$114,103
Special Mention—————————
Substandard—6402621,441—68——2,411
Total 1-4 family residential9,09712,87311,67013,74610,11351,5937,422—116,514
Current year-to-date gross write-offs—————————
Multi-family
Pass602—502——2,671——$3,775
Special Mention—————————
Substandard—————————
Total multi-family602—502——2,671——3,775
Current year-to-date gross write-offs—————————
Commercial
Pass———160—2,796890—$3,846
Special Mention—————————
Substandard—————————
Total commercial———160—2,796890—3,846
Current year-to-date gross write-offs—————————
Construction
Pass3321,80280383————$3,020
Special Mention—————————
Substandard—————————
Total construction3321,80280383————3,020
Current year-to-date gross write-offs—————————
Consumer
Pass981173034303——$312
Special Mention—————————
Substandard—————————
Total consumer981173034303——312
Current year-to-date gross write-offs—————————
Total
Pass10,12914,15212,74312,58210,14356,9958,312—125,056
Special Mention—————————
Substandard—6402621,441—68——2,411
Total10,12914,79213,00514,02310,14357,0638,312—127,467
Current year-to-date gross write-offs—————————

14

Term loans amortized cost basis by origination year
20252024202320222021PriorRevolving loans amortized cost basisRevolving loans converted to term loans amortized cost basisTotal
(Dollars in thousands)
1-4 family residential
Pass$16,653$13,335$16,423$10,870$16,434$37,769$6,454$—117,938
Special Mention—————————
Substandard—262———22——284
Total 1-4 family residential16,65313,59716,42310,87016,43437,7916,454—118,222
Current year-to-date gross write-offs—————————
Multi-family
Pass—507——2212,512——3,240
Special Mention—————————
Substandard—————————
Total multi-family—507——2212,512——3,240
Current year-to-date gross write-offs—————————
Commercial
Pass——165—922,834722—3,813
Special Mention—————————
Substandard—————————
Total commercial——165—922,834722—3,813
Current year-to-date gross write-offs—————————
Construction
Pass2,1561,67689—————3,921
Special Mention—————————
Substandard—————————
Total construction2,1561,67689—————3,921
Current year-to-date gross write-offs—————————
Consumer
Pass13046474032——268
Special Mention—————————
Substandard—————————
Total consumer13046474032——268
Current year-to-date gross write-offs—————————
Total
Pass18,93915,56416,72410,91016,75043,1177,176—129,180
Special Mention—————————
Substandard—262———22——284
Total18,93915,82616,72410,91016,75043,1397,176—129,464
Current year-to-date gross write-offs—————————

15

The aging of the Bank’s loan portfolio as of* June 30, 2026* and* December 31, 2025*, is as follows:

31-89 Days Past Due and AccruingGreater than 90 Days Past Due and AccruingNon-AccrualTotal Past Due and Non-AccrualCurrentTotal Loan Balance
(Dollars in thousands)
1-4 family residential$89$—$2,411$2,500$114,014$116,514
Multi-family————3,7753,775
Commercial————3,8463,846
Construction407——4072,6133,020
Consumer————312312
Total$496$—$2,411$2,907$124,560$127,467
1-4 family residential$641$—$284$925$117,297$118,222
Multi-family————3,2403,240
Commercial————3,8133,813
Construction————3,9213,921
Consumer————268268
Total$641$—$284$925$128,539$129,464

The following table presents the amortized cost basis of loans on nonaccrual status recorded at* June 30, 2026* and* December 31, 2025*. There wasno interest recognized on non-accrual loans for thesix months ended* June 30, 2026* and2025.

June 30, 2026December 31, 2025January 1, 2025
Nonaccrual with no Allowance for Credit LossesTotal NonaccrualNonaccrual with no Allowance for Credit LossesTotal NonaccrualNonaccrual with no Allowance for Credit LossesTotal Nonaccrual
(Dollars in thousands)
First mortgage loans
1-4 family residential$2,411$2,411$284$284$—$—
Multi-family——————
Commercial——————
Construction——————
Consumer loans——————
Total loans$2,411$2,411$284$284$—$—

The Bank* maymodify loans to borrowers experiencing financial difficulty by providing modifications to repayment terms; more specifically, modifications to loan interest rates. Management performs an analysis at the time of loan modification. Any reserve required is recorded through a provision to the allowance for credit losses on loans. There wereno modifications on loans to borrowers experiencing financial difficulty during thesix* months ended* June 30, 2026* and2025.

16

Note4: Deposits

As of* June 30, 2026* the scheduled maturities of time deposits are as follows:

For the 12 months ended
June 30,Amount
(Dollars in thousands)
2027$67,964
202813,198
20295,537
20303,421
2031 and beyond1,826
Total$91,946

In the normal course of business, deposit accounts are held by directors and executive officers of the Company and the Bank (related parties). The terms for these accounts, including interest rates, fees, and other attributes, are similar to those prevailing for comparable transactions with other customers and donot involve more than the normal level of risk associated with deposit accounts. At* June 30, 2026* and* December 31, 2025*, total deposits held by directors and officers of the Company and the Bank were $1.3 million.

17

Note5: Other Borrowings

There wereno additional borrowings made during thesix months ended* June 30, 2026* and2025. There wasno outstanding borrowed funds at* June 30, 2026and December 31, 2025.*

The following table shows certain information regarding our borrowings at or for the dates indicated:

For the three months ended · For the six months ended
June 30,June 30,
2026202520262025
(Dollars in thousands)
FHLB of Chicago advances and other borrowings:
Average balance outstanding$—$4,396$—$4,696
Maximum amount outstanding at any month-end during the period—5,000—5,000
Average interest rate during the periodN/A4.8%N/A4.8%

At* June 30, 2026and December 31, 2025,the Bank had borrowing capacity from the FHLB Chicago totaling $74.0 million and $79.1 million, respectively. The eligible borrowings are collateralized by $98.3 million and $105.1 million offirst* mortgage loans under a blanket lien arrangement at* June 30, 2026* and* December 31, 2025*, respectively.

Additionally, at* June 30, 2026* and* December 31, 2025*, we had a $10.0 million uncommitted, unsecured line of credit with BMO Harris Bank, none of which was drawn at* June 30, 2026* and* December 31, 2025*.

18

Note6: Fair Value Measurements

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements must maximize the use of observable inputs and minimize the use of unobservable inputs. There is a hierarchy ofthree levels of inputs that* may*be used to measure fair value:

Level 1Quoted prices in active markets for identical assets or liabilities
Level 2Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities
Level 3Unobservable inputs supported by little or no market activity and are significant to the fair value of the assets or liabilities

An asset’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

Following is a description of the valuation methodologies used for assets measured at fair value. There have beenno changes in the methodologies used at* June 30, 2026* or* December 31, 2025*.

Securities available for sale (Recurring)

Where quoted market prices are available in an active market, securities such as U.S. Treasuries, would be classified within Level1 of the valuation hierarchy. If quoted market prices arenot available, then fair values are estimated by using quoted prices of securities with similar characteristics or independent asset pricing services and pricing models, the inputs of which are market-based or independently sourced market parameters, including, butnot limited to, yield curves, interest rates, volatilities, prepayments, defaults, cumulative loss projections and cash flows. Such securities are classified in Level2 of the valuation hierarchy. In certain cases where Level1 or Level2 inputs arenot available, securities would be classified within Level3 of the hierarchy.

Individually Evaluated (Nonrecurring)

Individually evaluated loans are recorded at fair value on a nonrecurring basis. The fair value of loans is generally based on recent real estate appraisals. These appraisals* may*utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made

in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are usually significant and typically result in a Level3 classification of the inputs for determining fair value. Non-real estate collateral* maybe valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation and management’s expertise and knowledge of the client and client’s business, resulting in a Level3* fair value classification. Individually evaluated loans are evaluated on a quarterly basis for additional credit losses and adjusted accordingly.

19

The following table presents the Bank’s assets that are measured at fair value on a recurring basis classified under the appropriate level of the fair value hierarchy as of* June 30, 2026* and* December 31, 2025*:

Fair Value Measurements Using
Fair ValueLevel 1Level 2Level 3
(Dollars in thousands)
Securities available-for-sale
U.S. Treasury notes$7,020$7,020$—$—
U.S. government agency obligations8,153—8,153—
Municipal obligations12,028—12,028—
Mortgage-backed residential obligations21,751—21,751—
Collateralized mortgage obligations25,675—25,675—
Total$74,627$7,020$67,607$—
Securities available-for-sale
U.S. Treasuries$7,085$7,085$—$—
U.S. government agency obligations8,534—8,534—
Municipal obligations12,146—12,146—
Mortgage-backed residential obligations23,769—23,769—
Collateralized mortgage obligations27,185—27,185—
Total$78,719$7,085$71,634$—

The Bank* maybe required, from time to time, to measure certain assets and liabilities at fair value on a nonrecurring basis in accordance with accounting principles generally accepted in the United States of America. These include assets that are measured at the lower of cost or market that were recognized at fair value below cost at the end of the period. There wereno assets measured at fair value on a nonrecurring basis as of June 30, 2026and December 31, 2025.*

20

Note7: Fair Value of Financial Instruments

Financial instruments are classified within the fair value hierarchy using the methodologies described in Note6 – Fair Value Measurements. The following disclosures include financial instruments that arenot carried at fair value on the Consolidated Balance Sheets. The calculation of estimated fair values is based on market conditions at a specific point in time and* may**not* reflect current or future fair values.

Certain financial instruments generally expose the Company to limited credit risk and haveno stated maturities or have short-term maturities and carry interest rates that approximate market. The carrying value of these financial instruments assumes to approximate the fair value of these instruments. These instruments include cash and cash equivalents, non-interest bearing deposit accounts, time deposits with other financial institutions, FHLB stock, escrow deposits and accrued interest receivable and payable.

The carrying amounts and estimated fair values by fair value hierarchy of certain financial instruments are as follows:

Carrying · Estimated
AmountLevel 1Level 2Level 3Fair Value
(Dollars in thousands)
Financial assets:
Loans, net$126,528$—$—$119,914$119,914
Loans held for sale1,369—1,396—1,396
Financial liabilities:
Interest-bearing deposits$169,610$—$169,617$—$169,617
Financial assets:
Loans, net$128,635$—$—$122,290$122,290
Loans held for sale4,459—4,548—4,548
Financial liabilities:
Interest-bearing deposits$168,166$—$168,431$—$168,431

Note8: Capital Ratios

The Bank is subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory actions by regulators that, if undertaken, could have a direct material effect on the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines that involve quantitative measures of the Bank’s assets, liabilities and certain off-balance-sheet items as calculated under accounting principles generally accepted in the United States of America, regulatory reporting requirements and regulatory capital standards. The Bank’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

Quantitative measures established by regulatory reporting standards to ensure capital adequacy require the Bank to maintain minimum amounts and ratios of total and Tier I capital to risk-weighted assets, common equity Tier1 capital to total risk-weighted assets and of Tier I capital to average assets, as such individual components and calculations are defined by related standards.

As of* June 30, 2026* the most recent notification from the regulators categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. There areno conditions or events since that notification which management believes have changed the Bank’s category. On* November 13, 2019,the federal regulators finalized and adopted a regulatory capital rule establishing a new community bank leverage ratio (“CBLR”), which became effective on January 1, 2020.The intent of CBLR is to provide a simple alternative measure of capital adequacy for electing qualifying depository institutions and depository institution holding companies, as directed under the Economic Growth, Relief, and Consumer Protection Act. The CBLR is the ratio of a bank's tangible Tier1* equity capital to average total consolidated assets and has been set by the regulators at9%. However, in* November 2025,the OCC and the FDIC jointly issued a proposal to reduce the minimum leverage ratio for opting-in banks from9%* to8%, effective* July 1, 2026.Institutions with capital complying with the ratio and otherwise meeting the specified requirements and electing the alternative framework are considered to comply with the applicable regulatory capital requirements, including the risk-based requirements. A qualifying institution mayopt in and out of the CBLR framework on its quarterly call report. The CBLR option became effective January 1, 2020and is available to institutions with assets of less than$10.0* billion that meet other specified criteria. The rule also established atwo-quarter grace period for a qualifying institution whose leverage ratio falls below the9% requirement so long as the bank maintains a leverage ratio of7% or greater. A qualifying community bank that exercises the election and has capital equal to or exceeding the applicable percentage is considered compliant with all applicable regulatory capital requirements. Qualifying institutions* mayelect to utilize the CBLR in lieu of the generally applicable risk-based capital requirements. The Bank elected to begin using CBLR for thefirst* quarter of2020.

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The Bank’s actual capital amounts and ratios as of* June 30, 2026* and* December 31, 2025*, are presented below:

Minimum Required to be
ActualWell-Capitalized (1)
AmountRatioAmountRatio
As of June 30, 2026 · (Dollars in thousands)
Tier 1 capital (to Average Assets)$68,30725.48%$24,127>9%
Tier 1 capital (to Average Assets)$66,36624.32%$24,563>9%

(1) As defined by regulatory agencies. Failure to exceed the leverage ratio thresholds required under CBLR in the future, subject to any applicable grace period, would require the Bank to return to the risk-based capital ratio thresholds previously utilized under the fully phased-in Basel III Capital Rules to determine capital adequacy.

Note9: Commitments and Contingencies

In the ordinary course of business, the Bank has various commitments and contingent liabilities that arenot reflected in the accompanying financial statements. In the opinion of management, the ultimate disposition of these matters isnot expected to have a material adverse effect on the financial position of the Bank.

Financial Instruments

The Bank doesnot engage in the use of interest rate swaps or futures, forwards or option contracts.

At* June 30, 2026* and* December 31, 2025*, unused lines of credit and outstanding commitments to originate loans were as follows:

June 30, 2026December 31, 2025
(Dollars in thousands)
Unused line of credit$5,836$7,220
Commitments to originate loans2,8751,586
Total commitments$8,711$8,806

Concentrations of Credit Risk

The Bank generally originates single-family residential loans within its primary lending area. These loans are secured by the underlying properties.

The Bank maintains its cash in deposit accounts at the Federal Reserve Bank or other institutions, the balances of which* mayexceed federally insured limits. The Bank hasnot* experienced any losses in such accounts. The Bank believes it isnot exposed to any significant credit risk on cash and cash equivalents.

Interest Rate Risk

The Bank assumes interest rate risk (the risk that general interest rate levels will change) as a result of its normal operations. As a result, fair values of its financial instruments will change when interest rate levels change, and that change* may*be either favorable or unfavorable to the Bank. Management attempts to match maturities of assets and liabilities to the extent believed necessary to minimize interest rate risk. However, borrowers with fixed rate obligations are less likely to prepay in a rising rate environment and more likely to prepay in a falling rate environment. Conversely, depositors who are receiving fixed rates are more likely to withdraw funds before maturity in a rising rate environment and less likely to do so in a falling rate environment. Management monitors rates and maturities of assets and liabilities and attempts to minimize interest rate risk by adjusting terms of new loans and deposits and by investing in securities with terms that mitigate the overall interest rate risk.

Litigation

Due to the nature of its business activities, the Bank is at times subject to legal action which arises in the normal course of business. In the opinion of management, the ultimate resolution of these matters isnot expected to have a material effect on the financial position or results of operations of the Bank.

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Note10: Earnings Per Share

Basic EPS represents income available to common stockholders divided by the weighted-average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common shares (such as stock options) were exercised or converted into additional common shares that should then share in the earnings of the entity. Diluted EPS is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding for the period, plus the effect of potential dilutive common share equivalents.

There wereno securities or other contracts that had a dilutive effect for thethree orsix months ended* June 30, 2026and2025,* and therefore the weighted average common shares outstanding used to calculate both basic and diluted EPS are the same. Shares held by the Employee Stock Ownership Plan ("ESOP") that havenot been allocated to employees in accordance with the terms of the ESOP, referred to as "unallocated ESOP shares", arenot deemed outstanding for EPS calculations.

Three Months Ended June 30,Six months ended June 30,
2026202520262025
(Income in thousands) · (Income in thousands)
Net loss applicable to common shares$(204)$(258)$(243)$(586)
Average number of common shares outstanding5,260,9795,246,5715,261,2545,247,847
Less: Average unallocated ESOP shares338,963359,919341,650362,557
Average number of common shares outstanding used to calculate basic loss per common share4,922,0164,886,6524,919,6044,885,290
Loss per common share basic and diluted$(0.04)$(0.05)$(0.05)$(0.12)

All unallocated ESOP shares have been excluded from the calculation of basic and diluted EPS. Due to the net loss position, all outstanding share option awards are anti-dilutive and excluded from the computation of diluted earnings per share.

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Note11: Stock Based Compensation

ESOP

Employees participate in an Employee Stock Ownership Plan ("ESOP"). The ESOP borrowed funds from the Company to purchase 431,836 shares of stock at $10 per share. The Bank makes discretionary contributions to the ESOP, as well as paying dividends on unallocated shares to the ESOP, and the ESOP uses funds it receives to repay the loan. When loan payments are made, ESOP shares are allocated to participants based on relative compensation. Participants receive the shares at the end of employment. Dividends on allocated shares increase participants accounts.

There wereno contributions to the ESOP during thefirst six months of2026, as the annual loan payment will be made during thefourth quarter. Expense recorded was $72,000 and $63,000 for thethree months ended* June 30, 2026and2025*, respectively, and is recognized over the service period. Expense recorded was $138,000 and $127,000 for thesix months ended* June 30, 2026and2025*, respectively, and is recognized over the service period.

Shares held by the ESOP were as follows:

As of June 30,
20262025
(Dollars in thousands)
Shares allocated85,66964,844
Shares committed for allocation10,80610,610
Shares distributed to plan participants(5,015)(1,597)
Unallocated335,361356,382
Total ESOP shares426,821430,239
Fair value of unearned shares as of June 30, 2026 and 2025, respectively$4,615$4,394

Fair value of unearned shares is based on a stock price of $13.76 and $12.33 as of* June 30, 2026* and2025, respectively.

Equity Incentive Plan

At the Company's annual meeting of stockholders held on* May 24, 2023,stockholders approved the NSTS Bancorp, Inc.2023 Equity Incentive Plan (“2023* Equity Plan”), which provides for the granting of up to 755,714 shares (215,918 shares of restricted stock and 539,796 shares available for future grants of stock options) of the Company’s common stock pursuant to equity awards made under the2023 Equity Plan.

Stock options granted under the2023 Equity Plan generally vest in equal annual installments over a service period offive years beginning on the date of grant. The vesting of the options accelerates upon death, disability or following a change in control of the Company. Stock options are generally granted at an exercise price equal to the fair value of the Company’s common stock on the grant date based on the closing market price of the Company's common stock on the date of grant, and have an expiration period often years. As of* June 30, 2026*, the Company has 26,296 shares available for future grants of stock options under the2023 Equity Plan.

The Company recognizes compensation expense for the fair values of these awards, which have graded vesting, on a straight-line basis over the requisite service period of the awards. Upon exercise of vested options, management expects tofirst draw on treasury stock as the source for shares.

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The following is a summary of the Company's stock option activity and related information for the periods presented.

Stock OptionSharesWeighted Average Exercise PriceAggregate Intrinsic Value (1)
Outstanding at March 31, 2025492,500$9.59
Granted——
Exercised——
Forfeited(2,000)9.36
Outstanding at June 30, 2025490,500$9.59$1,344
Exercisable - End of Period186,8009.36555
Outstanding at March 31, 2026467,500$9.61
Granted——
Exercised——
Forfeited——
Outstanding at June 30, 2026467,500$9.61$1,940
Exercisable - End of Period291,3009.441,258
Stock OptionSharesWeighted Average Exercise PriceAggregate Intrinsic Value (1)
Outstanding at December 31, 2024500,500$9.59
Granted——
Exercised——
Forfeited(10,000)9.36
Outstanding at June 30, 2025490,500$9.59$1,344
Exercisable - End of Period186,8009.36555
Outstanding at December 31, 2025467,500$9.61
Granted——
Exercised——
Forfeited——
Outstanding at June 30, 2026467,500$9.61$1,940
Exercisable - End of Period291,3009.441,258

(1) Dollars in thousands. The aggregate intrinsic value of outstanding and exercisable options at* June 30, 2026and2025* were calculated based on the closing market price of the Company's common stock of* June 30, 2026and2025* of $13.76 and $12.33, respectively, per share less the exercise price.

Expected future expense relating to the non-vested options outstanding as of* June 30, 2026* is $629,000 over a weighted average period of 2.1 years. As of* June 30, 2026,the Company had 176,200 in nonvested stock options. As of June 30, 2026*, the Company had 467,500 in outstanding stock options with a weighted average remaining life of 7.2 years outstanding.

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Restricted shares granted under the2023 Equity Plan generally vest in equal annual installments over a service period offive years beginning on the date of grant. The vesting of the awards accelerates upon death, disability or following a change in control of the Company. The product of the number of shares granted and the grant date closing market price of the Company’s common stock determines the fair value of restricted shares under the2023 Equity Plan. Management recognizes compensation expense for the fair value of restricted shares on a straight-line basis over the requisite service period.

As of* June 30, 2026*, the Company has 14,018 shares of restricted stock available for future grants under the2023 Equity Plan.

The following is a summary of the status of the Company's restricted shares as of and for the periods presented.

Restricted StockSharesWeighted Average Grant Date Fair Value
Non-vested balance as of March 31, 2025149,740$9.57
Granted——
Vested33,2609.36
Forfeited——
Non-vested balance as of June 30, 2025116,480$9.63
Non-vested balance as of March 31, 2026113,140$9.58
Granted——
Vested46,8609.36
Forfeited——
Non-vested balance as of June 30, 202666,280$9.75
Restricted StockSharesWeighted Average Grant Date Fair Value
Non-vested balance as of December 31, 2024151,740$9.57
Granted——
Vested33,2609.36
Forfeited2,0009.36
Non-vested balance as of June 30, 2025116,480$9.63
Non-vested balance as of December 31, 2025113,140$9.58
Granted——
Vested46,8609.36
Forfeited——
Non-vested balance as of June 30, 202666,280$9.75

Expected future expense related to the non-vested restricted shares outstanding as of period end is $616,000 over a weighted average period of 2.3 years.

The following table presents the stock based compensation expense for the periods presented. On* April 7, 2026,the Bank's President and CEO, Mr. Nathan Walker, passed away. Due to the passing of Mr. Walker, stock options to purchase 51,000 shares of the Company's common stock and 20,400 shares of restricted stock previously awarded to Mr. Walker under the2023* Equity Plan vested during the quarter ended* June 30, 2026,pursuant to the terms of the2023* Equity Plan. The early vesting of the stock options and restricted stock awards resulted in an additional expense of $134,000 and $141,000, respectively, during the quarter ended* June 30, 2026.*

Three Months Ended June 30,Six months ended June 30,
2026202520262025
(Dollars in thousands) · (Dollars in thousands)
Stock option expense$204$87$290$160
Restricted stock expense21188298172
Total stock based compensation expense$415$175$588$332
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