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PURE BIOSCIENCE INC

For the period ended Jan 31, 2024. Filed Mar 18, 2024.

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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.

Jan 31, 2024 · Filed Mar 18, 2024

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Item 1. Financial Statements

Condensed Consolidated Balance Sheets

January 31, 2024July 31, 2023
(Unaudited)
Assets
Current assets
Cash and cash equivalents$557,000$1,095,000
Accounts receivable171,000285,000
Inventories, net74,00088,000
Restricted cash75,00075,000
Prepaid expenses62,00061,000
Total current assets939,0001,604,000
Property, plant and equipment, net147,000221,000
Total assets$1,086,000$1,825,000
Liabilities and stockholders’ equity (deficiency)
Current liabilities
Accounts payable$409,000$422,000
Accrued liabilities136,000110,000
Total current liabilities545,000532,000
Long-term liabilities
Note payable to related parties1,862,0001,021,000
Total long-term liabilities1,862,0001,021,000
Total liabilities2,407,0001,553,000
Commitments and contingencies--
Stockholders’ equity (deficiency)
Preferred stock, $0.01 par value: 5,000,000 shares authorized, no shares issued and outstanding——
Common stock, $0.01 par value: 150,000,000 shares authorized, 111,856,473 shares issued and outstanding at January 31, 2024, and July 31, 20231,119,0001,119,000
Additional paid-in capital132,542,000132,398,000
Accumulated deficit(134,982,000)(133,245,000)
Total stockholders’ equity (deficiency)(1,321,000)272,000
Total liabilities and stockholders’ equity (deficiency)$1,086,000$1,825,000

Condensed Consolidated Statements of Operations

Six Months Ended · Three months Ended
January 31,January 31,
2024202320242023
Net product sales$1,043,000$863,000$325,000$396,000
Royalty revenue5,0005,0001,0001,000
Total revenue1,048,000868,000326,000397,000
Cost of goods sold429,000414,000149,000200,000
Gross profit619,000454,000177,000197,000
Operating costs and expenses
Selling, general and administrative2,138,0002,345,0001,065,0001,180,000
Research and development156,000153,00076,00075,000
Total operating costs and expenses2,294,0002,498,0001,141,0001,255,000
Loss from operations(1,675,000)(2,044,000)(964,000)(1,058,000)
Other income (expense)
Other income (expense), net—(5,000)——
Interest expense, net(62,000)(4,000)(38,000)(2,000)
Total other income (expense)(62,000)(9,000)(38,000)(2,000)
Net loss$(1,737,000)$(2,053,000)$(1,002,000)$(1,060,000)
Basic and diluted net loss per share$(0.02)$(0.02)$(0.01)$(0.01)
Shares used in computing basic and diluted net loss per share111,856,473111,356,473111,856,473111,356,473

Condensed Consolidated Statement of Stockholders’ Equity (Deficiency)

Six Months Ended January 31, 2024 · Six Months Ended January 31, 2023
Common Stock · Additional Paid-In · Accumulated · Total Stockholders’ · Common Stock · Additional Paid-In · Accumulated · Total Stockholders’
SharesAmountCapitalDeficitEquitySharesAmountCapitalDeficitEquity
Balances at beginning of period111,856,473$1,119,000$132,398,000$(133,245,000)$272,000111,356,473$1,114,000$132,079,000$(129,284,000)$3,909,000
Share-based compensation expense - stock options——144,000—144,000——169,000—169,000
Share-based compensation expense - restricted stock units———————42,000—42,000
Net loss———(1,737,000)(1,737,000)———(2,053,000)(2,053,000)
Balances at end of period (Unaudited)111,856,473$1,119,000$132,542,000$(134,982,000)$(1,321,000)111,356,473$1,114,000$132,290,000$(131,337,000)$2,067,000
Three Months Ended January 31, 2024 · Three Months Ended January 31, 2023
Common Stock · Additional Paid-In · Accumulated · Total Stockholders’ · Common Stock · Additional Paid-In · Accumulated · Total Stockholders’
SharesAmountCapitalDeficitEquitySharesAmountCapitalDeficitEquity
Balances at beginning of period (Unaudited)111,856,473$1,119,000$132,478,000$(133,980,000)$(383,000)111,356,473$1,114,000$132,163,000$(130,277,000)$3,000,000
Share-based compensation expense - stock options——64,000—64,000——106,000—106,000
Share-based compensation expense - restricted stock units———————21,000—21,000
Net loss———(1,002,000)(1,002,000)———(1,060,000)(1,060,000)
Balances at end of period (Unaudited)111,856,473$1,119,000$132,542,000$(134,982,000)$(1,321,000)111,356,473$1,114,000$132,290,000$(131,337,000)$2,067,000

See accompanying notes.

Condensed Consolidated Statements of Cash Flows

Six Months Ended
January 31,
20242023
Operating activities
Net loss$(1,737,000)$(2,053,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation144,000211,000
Depreciation and amortization74,00067,000
Gain on extinguishment of indebtedness——
Changes in operating assets and liabilities:
Accounts receivable114,00045,000
Inventories14,000(21,000)
Prepaid expenses(1,000)(6,000)
Interest on note payable56,000—
Accounts payable and accrued liabilities13,000(112,000)
Net cash used in operating activities(1,323,000)(1,869,000)
Investing activities
Purchases of property, plant and equipment—(37,000)
Net cash used in investing activities—(37,000)
Financing activities
Net proceeds from note payable to related parties785,000—
Net cash provided by financing activities785,000—
Net decrease in cash, cash equivalents, and restricted cash(538,000)(1,906,000)
Cash, cash equivalents, and restricted cash at beginning of period1,170,0003,466,000
Cash, cash equivalents, and restricted cash at end of period$632,000$1,560,000
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents$557,000$1,485,000
Restricted cash$75,000$75,000
Total cash, cash equivalents and restricted cash$632,000$1,560,000
Supplemental disclosure of cash flow information
Cash paid for taxes$—5,000

Notes to Condensed Consolidated Financial Statements

(Unaudited)

For the three and six months ended January 31, 2024 and 2023

1. Basis of Presentation

The accompanying unaudited condensed consolidated financial statements include the consolidated accounts of PURE Bioscience, Inc. and its wholly owned subsidiary, ETI H2O Inc., a Nevada corporation. ETI H2O, Inc. currently has no business operations and no material assets or liabilities and there have been no significant transactions related to ETI H2O, Inc. during the periods presented in the condensed consolidated financial statements. All inter-company balances and transactions have been eliminated. All references to “PURE,” “we,” “our,” “us” and the “Company” refer to PURE Bioscience, Inc. and our wholly owned subsidiary.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP, for interim financial information pursuant to the instructions to Form 10-Q and Article 10/Rule 8-03 of Regulation S-X. Accordingly, they do not include all of the information and disclosures required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the quarter ended January 31, 2024 are not necessarily indicative of the results that may be expected for other quarters or the year ending July 31, 2024. The July 31, 2023 balance sheet was derived from audited financial statements but does not include all disclosures required by GAAP and included in our Annual Report on Form 10-K. For more complete information, these unaudited financial statements and the notes thereto should be read in conjunction with the audited financial statements for the year ended July 31, 2023 included in our Annual Report on Form 10-K covering such period filed with the Securities and Exchange Commission, or SEC, on October 30, 2023.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and the accompanying notes. Actual results could differ from those estimates.

2. Liquidity and Going Concern

We have a history of recurring losses, and as of January 31, 2024 we have a stockholders deficiency of $1,321,000. During the six months ended January 31, 2024, we recorded a net loss of $1,737,000 on recorded net revenue of $1,048,000. In addition, during the six months ended January 31, 2024 we used $1,323,000 in operating activities resulting in a cash balance of $557,000 as of January 31, 2024. Our history of recurring operating losses, and negative cash flows from operating activities give rise to substantial doubt regarding our ability to continue as a going concern. The Company’s independent registered public accounting firm, in its report on the Company’s consolidated financial statements for the year ended July 31, 2023, has also expressed substantial doubt about the Company’s ability to continue as a going concern. The financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classifications of liabilities that may result from our possible inability to continue as a going concern.

Our future capital requirements depend on numerous forward-looking factors. These factors may include, but are not limited to, the following: the acceptance of, and demand for, our products; our success and the success of our partners in selling our products; our success and the success of our partners in obtaining regulatory approvals to sell our products; the costs of further developing our existing products and technologies; the extent to which we invest in new product and technology development; and the costs associated with the continued operation, and any future growth, of our business. The outcome of these and other forward-looking factors will substantially affect our liquidity and capital resources.

Until we can continually generate positive cash flow from operations, we will need to continue to fund our operations with the proceeds of offerings of our equity and debt securities. However, we cannot ensure that additional financing will be available when needed or that, if available, financing will be obtained on terms favorable to us or to our stockholders. If we raise additional funds from the issuance of equity securities, substantial dilution to our existing stockholders would likely result. If we raise additional funds by incurring debt financing, the terms of the debt may involve significant cash payment obligations as well as covenants and specific financial ratios that may restrict our ability to operate our business.

3. Significant Accounting Policies

Revenue Recognition

We account for revenue in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”), Topic 606, Revenue from Contracts with Customers (“Topic 606”). Under Topic 606, revenue is recognized at an amount that reflects the consideration to which we expect to be entitled in exchange for transferring goods or services to a customer. This principle is applied using the following 5-step process:

1.Identify the contract with the customer
2.Identify the performance obligations in the contract
3.Determine the transaction price
4.Allocate the transaction price to the performance obligations in the contract
5.Recognize revenue when (or as) each performance obligation is satisfied

Under Topic 606, we recognize revenue when we satisfy a performance obligation by transferring control of the promised goods or services to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services.

Our technology platform is based on patented stabilized ionic silver, and our initial products contain silver dihydrogen citrate, or SDC. SDC is a broad-spectrum, non-toxic antimicrobial agent, which offers 24-hour residual protection and formulates well with other compounds. We sell various configurations and dilutions of SDC direct to customers and through distributors. We currently offer PURE® Hard Surface as a food contact surface sanitizer and disinfectant to restaurant chains, food processors and food transportation companies. We also offer PURE Control® as a direct food contact processing aid.

Contract terms for unit price, quantity, shipping and payment are governed by sales agreements and purchase orders which we consider to be a customer’s contract in all cases. The unit price is considered the observable stand-alone selling price for the arrangements. Any promotional or sales discounts are applied evenly to the units sold for purposes of calculating standalone selling price.

Product sales generally consist of a single performance obligation that we satisfy at a point in time. We recognize product revenue when the following events have occurred: (a) we have transferred physical possession of the products, (b) we have a present right to payment, (c) the customer has legal title to the products, and (d) the customer bears significant risks and rewards of ownership of the products.

Our direct customer and distributor sales are invoiced based on received purchase orders. Our payment terms on invoiced direct customer and distributor sales range between 30 and 90 days after we satisfy our performance obligation. The majority of our customers are on 30 day payment terms. We currently offer no right of return on invoiced sales and maintain no allowance for sales returns.

Shipping and handling are treated as activities to fulfill promises to customers and any amounts billed to a customer, if applicable, represent revenues earned for the goods provided. Costs related to such shipping and handling billings are classified as cost of sales.

We do not have significant categories of revenue that may impact how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors.

A summary of our revenue by product type for the six months ended January 31, 2024 and 2023 is as follows:

January 31,
20242023
PURE Hard Surface$1,036,000$778,000
SILVÉRION7,00085,000
Revenue$1,043,000$863,000

A summary of our revenue by product type for the three months ended January 31, 2024 and 2023 is as follows:

January 31,
20242023
PURE Hard Surface$325,000$332,000
SILVÉRION—64,000
Revenue$325,000$396,000

Variable Consideration

We record revenue from customers in an amount that reflects the transaction price we expect to be entitled to after transferring control of those goods or services. From time to time, we offer sales promotions on our products such as discounts. Variable consideration is estimated at contract inception only to the extent that it is probable that a significant reversal of revenue will not occur.

Use of Estimates

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America, or GAAP, requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements, and the disclosures made in the accompanying notes to the consolidated financial statements. Actual results could differ materially from those estimates. Those estimates and assumptions include estimates for reserves of uncollectible accounts, inventory obsolescence, depreciable lives of property and equipment, realization of deferred tax assets, accruals for potential liabilities and assumptions made in valuing stock instruments issued for services.

Net Loss Per Share

Basic net loss per common share is computed as net loss divided by the weighted average number of common shares outstanding for the period. Our diluted net loss per common share is the same as our basic net loss per common share because we incurred a net loss during each period presented, and the potentially dilutive securities from the assumed exercise of all outstanding stock options, restricted stock units, and warrants would have an anti-dilutive effect. As of January 31, 2024 and 2023, stock options, shares issuable upon the conversion of debt, and shares issuable under restricted stock unit awards of 21,481,458 and 9,098,125, respectively, have been excluded from the computation of diluted shares outstanding.

January 31,
20242023
Common stock options8,355,6257,885,625
Restricted stock units712,5001,212,500
Shares issuable upon the conversion of debt12,413,333—
Total21,481,4589,098,125

Inventory

Inventories are stated at the lower of cost or net realizable value, and net of a valuation allowance for potential excess or obsolete material. Cost is determined using the average cost method. Depreciation related to manufacturing is systematically allocated to inventory produced, and expensed through cost of goods sold at the time inventory is sold.

Inventories consist of the following:

January 31, 2024July 31, 2023
Raw materials$18,000$11,000
Finished goods56,00077,000
Inventories$74,000$88,000

Share-Based Compensation

We periodically issue stock options and restricted stock awards to employees and non-employees in non-capital raising transactions for services and for financing costs. We account for such grants issued and vesting to employees based on ASC 718, whereby the value of the award is measured on the date of grant and recognized as compensation expense on the straight-line basis over the vesting period.

We estimate the fair value of share-based payment awards at the date of grant using the Black-Scholes option valuation model. The Black-Scholes option valuation model requires the input of subjective assumptions, including price volatility of the underlying stock, risk-free interest rate, dividend yield, and expected life of the option. Share-based compensation expense is based on awards ultimately expected to vest, and therefore is reduced by expected forfeitures.

Concentrations

Gross product sales. For the three months ended January 31, 2024, one customer accounted for 12% of net product sales. For the six months ended January 31, 2024, one customer accounted for 30% of our net product sales. For the three months ended January 31, 2023, two individual customers accounted for 16% and 15% of our net product sales. For the six months ended January 31, 2023, one customer accounted for 10% of our net product sales, respectively.

*Accounts receivable.*As of January 31, 2024, we had accounts receivable from two customers that comprised of 19% and 17% of total accounts receivable, respectively. As of January 31, 2023, we had accounts receivable from two customers that comprised 31% and 19% of total accounts receivable.

*Purchases.*For the three months ended January 31, 2024, one vendor accounted for 12% of our purchases. For the six months ended January 31, 2024, two vendors accounted for 16% and 12% of our purchases. For the three months ended January 31, 2023, one vendor accounted for 19% of our purchases. For the six months ended January 31, 2023, one vendor accounted for 14% of our purchases.

Accounts payable. As of January 31, 2024, our largest vendor accounted for 10% of the total accounts payable. As of January 31, 2023, our largest three vendors accounted for 22%,10% and 10% of the total trade accounts payable, respectively.

Segments

We operate inone segment for the manufacture and distribution of our products. In accordance with the “Segment Reporting” Topic of the ASC, our chief operating decision maker has been identified as the Chief Executive Officer and President, who reviews operating results to make decisions about allocating resources and assessing performance for the entire Company. Existing guidance, which is based on a management approach to segment reporting, establishes requirements to report selected segment information quarterly and to report annually entity-wide disclosures about products and services, major customers, and the countries in which the entity holds material assets and reports revenue. All material operating units qualify for aggregation under “Segment Reporting” due to their similar customer base and similarities in: economic characteristics; nature of products and services; and procurement, manufacturing and distribution processes. Since the Company operates in one segment, all financial information required by “Segment Reporting” can be found in the accompanying financial statements

4. Recent Accounting Pronouncements

In June 2016, the FASB issued ASU No. 2016-13, Credit Losses - Measurement of Credit Losses on Financial Instruments or ASC 326. The standard significantly changes how entities will measure credit losses for most financial assets, including accounts and notes receivable. The standard will replace today’s “incurred loss” approach with an “expected loss” model, under which companies will recognize allowances based on expected rather than incurred losses. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. As small business filer, the standard became effective for us as of August 1, 2023. The adoption of ASU 2016-13 did not have any impact on the Company’s consolidated financial statement presentation or disclosures.

Recent accounting pronouncements issued by the FASB, including its Emerging Issues Task Force, the American Institute of Certified Public Accountants, and the Securities and Exchange Commission did not or are not believed by management to have a material impact on the Company’s present or future consolidated financial statement presentation or disclosures.

5. Debt

Note Purchase Agreement with Related Parties

On July 3, 2023, the Company entered into a Note Purchase Agreement (the “Note Purchase Agreement”) with certain accredited investors (“Lenders”) pursuant to which the Company issued the Lenders convertible promissory notes (the “Notes”, collectively with the Note Purchase Agreement, the “Note Documents”) with an aggregate principal balance of $1,015,000 (the “Private Placement”).The Note Documents provide for subsequent closings for an aggregate offering size of $1.8 million in principal balance. Messrs. Tom Y. Lee and Ivan Chen, each members of the Company’s Board of Directors (the “Board”) invested $1,000,000 and $15,000, as of July 31, 2023, respectively in the Private Placement, through affiliates or directly. On October 20, 2023, we issued an additional Note to Mr. Lee pursuant to the Note Purchase Agreement in a subsequent closing with an aggregate principal of $785,000. The disinterested members of the Board approved the Private Placement. As of January 31, 2024, $1,800,000 of principal was outstanding under these note agreements.

The Note Documents provided that the interest to the Lender shall accrue at the rate of 7.55% and 7.81%, compounded annually, for the July 2023 and October 2023 Note, respectively. The Maturity Date (as defined in the Notes) of the Notes is the third-year anniversary of the date of issuance, or such earlier date as the Notes provide.

*Conversion.*All or any portion of the principal amount of the Note, plus accrued and unpaid interest, is convertible at any time, in whole or in part, at a Lender’s or the Company’s option, into shares of the Company’s common stock at a conversion price equal to the 30-day volume-weighted average price of the Company’s common stock as reported on the market or exchange on whichthe Company’s common stock is listed or quoted for trading (the “VWAP”) on the date of conversion on the last trading day prior to the date of conversion, provided that such conversion price is at least $0.15 per share and less than or equal to $0.23 per share, subject to certain customary adjustments. Additionally, at any time following July 3, 2024, the holders of a majority of the outstanding principal balance under the Notes may elect specified in writing to convert all of the Notes at a conversion price equal to the VWAP, provided that the conversion price is equal to at least $0.15 per share, subject to certain customary adjustments.

Further, in the event of certain corporate transactions, all outstanding principal and unpaid accrued interest due on such Notes shall be automatically converted into conversion shares on the trading day immediately prior to the closing date of such corporate transaction. The number of shares to be issued upon such conversion shall be based on the VWAP on the last trading day prior to the public announcement of the execution of the definitive documents with respect to such transaction. As of January 31, 2024, the notes and accrued interest were convertible into 12,413,333 shares of common stock.

Events of Default. The Notes Documents provide for certain events of default that are typical for a transaction of this type, including, among other things, default in the payment of principal or interest for more than 30 days, the Company’s making an assignment for the benefit of creditors, within 15 days after the commencement of bankruptcy proceedings against the Company, or breach of certain covenants described below.

Covenants. The Company will be subject to certain customary covenants regarding the current public information, reservation of adequate share reserve, and maintenance of intellectual property rights, among other customary matters.

During the six months ended January 31, 2024, we recognized $56,000 of interest expense related to the Note, respectively. As of January 31, 2024, interest of $62,000 was added to the principal resulting in a balance owed of $1,862,000.

6. Stockholders’ Equity

Restricted Stock Units

We issue restricted stock unit awards or RSUs, to key management and as compensation for services to consultants and others. The RSUs typically vest over a one to three-year period and carry a ten-year term. Each RSU represents the right to receive one share of common stock, issuable at the time the RSU subsequently settles, as set forth in the Restricted Stock Unit Agreement. We determine that fair value of those awards at the date of grant, and amortize those awards as an expense over the vesting period of the award. The shares earned under the grant are usually issued when the award settles at the end of the term.

During the six months ended January 31, 2024 no compensation cost related to RSU’s was recognized, as all outstanding RSU’s were fully vested. During the six months ended January 31, 2023, we recognized $42,000 of compensation cost relating to the vesting of RSU’s.

During the six months ended January 31, 2024, no RSUs were granted, issued, or forfeited. All of the remaining 712,500 RSUs outstanding are vested and issuable as of July 31, 2023 and January 31, 2024, respectively. These RSUs are issued upon settlement date which is defined as “for each Vested Unit, the earliest of (i) the ten-year anniversary of the Grant Date; (ii) sixty days after the date the Grantee’s Service ceases for any reason and such cessation constitutes a “separation from service” within the meaning of Section 409A of the Code; (iii) the date of Grantee’s death or (iv) the date of a Change in Control that constitutes a “change in control event” within the meaning of Section 409A of the Code”.

A summary of our restricted stock unit activity and related data is as follows:

Total RSU SharesVested and Issuable
Outstanding at July 31, 2023712,500712,500
Granted——
Issued——
Forfeited——
Outstanding at January 31, 2024712,500712,500

Stock Option Plans

2007 Equity Incentive Plan

In February 2016, we amended and restated our 2007 Equity Incentive Plan, the (“2007 Plan”), to, among other changes, increase the number of shares of common stock issuable under the 2007 Plan by 4,000,000 shares and extend the term of the 2007 Plan until February 4, 2026. The 2007 Plan provides for the grant of incentive and non-qualified stock options, as well as other share-based payment awards, to our employees, directors, consultants and advisors. These awards have up to a 10-year contractual life and are subject to various vesting periods, as determined by the Compensation Committee of the Board of Directors. As of January 31, 2024, there were approximately 1,021,000 shares available for issuance under the 2007 Plan.

2017 Equity Incentive Plan

In January 2021, we amended and restated our 2017 Equity Incentive Plan, the (“2017 Plan”), to, among other changes, increase the number of shares of common stock issuable under the 2017 Plan by 5,000,000 shares and extend the term of the 2007 Plan until January 2031. The 2017 Plan provides for the grant of incentive and non-qualified stock options, as well as other share-based payment awards, to our employees, directors, consultants and advisors. These awards have up to a 10-year contractual life and are subject to various vesting periods, as determined by the Compensation Committee of the Board of Directors. As of January 31, 2024, there were approximately 3,046,000 shares available for issuance under the 2017 Plan.

During the six months ended January 31, 2024, the Compensation Committee of the Board of Directors granted 2,000,000 stock options to our employees, officers, directors and consultants with a fair value of $197,000 as determined by the Black Scholes option pricing model. The vesting terms of the options vary between one and two years and carry a ten-year term. There wereno stock options granted during the three months ended January 31, 2024 and 2023.

A summary of our stock option activity is as follows:

SharesWeighted- Average Exercise PriceAggregate Intrinsic Value
Outstanding at July 31, 20236,700,625$0.48$—
Granted2,000,000$0.12—
Exercised—$——
Cancelled(345,000)$0.29—
Outstanding at January 31, 20248,355,625$0.40$—

The weighted-average remaining contractual term of options outstanding at January 31, 2024 was 7.4 years.

At January 31, 2024, options to purchase 7,429,792 shares of common stock were exercisable. These options had a weighted-average exercise price of $0.44 and a weighted average remaining contractual term of 7.1 years. The total unrecognized compensation cost related to unvested stock option grants as of January 31, 2024 was approximately $75,000 and the weighted average period over which these grants are expected to vest is 0.62 years.

For the six months ended January 31, 2024, share-based compensation expense for stock options that vested during the period was $144,000. For the six months ended January 31, 2023, share-based compensation expense for stock options that vested during the period was $169,000.

We use the Black-Scholes valuation model to calculate the fair value of stock options. Stock-based compensation expense is recognized over the vesting period using the straight-line method. The fair value of stock options was estimated at the grant date using the following weighted average assumptions:

For the six months ended January 31,
20242023
Volatility110.95%91.90%
Risk-free interest rate4.18%4.00%
Dividend yield—%—%
Expected life5.365.34

Volatility is the measure by which our stock price is expected to fluctuate during the expected term of an option. Volatility is derived from the historical daily change in the market price of our common stock, as we believe that historical volatility is the best indicator of future volatility.

The risk-free interest rates used in the Black-Scholes calculations are based on the prevailing U.S. Treasury yield as determined by the U.S. Federal Reserve.

We have never paid dividends on our common stock and do not anticipate paying dividends on our common stock in the foreseeable future. Accordingly, we have assumed no dividend yield for purposes of estimating the fair value of our share-based compensation.

The expected life of options was estimated using the average between the contractual term and the vesting term of the options.

7. Related Party Transactions

As of January 31, 2024 and January 31, 2023, accounts payable include $102,600 and $115,250 in board fees due to officers and directors, respectively.

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