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MUSTANG BIO, INC.

For the period ended Jun 30, 2026. Filed Aug 5, 2026.

View on SEC.gov

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 5, 2026

MBIO$0.39-0.8%Stored close · as of Nov 9, 2026

What changed in Risk Factors?

Read the current filing

Previous report: 10-Q

Period ended 2026-03-31; filed 2026-05-05.

0001104659-26-055598

Item 1A. Risk Factors

Current report: 10-Q

Period ended 2026-06-30; filed 2026-08-05.

0001104659-26-091061

Item 1A. Risk Factors

The baseline is this issuer’s latest earlier reporting period of the same form that was filed before the current report. A previous 10-Q is a different quarter, not a year-over-year comparison. Amendments are excluded.

Compared 199 previous paragraphs and 205 current paragraphs.

192 unchanged; 7 reworded; 5 added; 0 removed; 0 previous and 1 current paragraphs rearranged.

Tables are not compared: 149 previous and 149 current tables excluded. Dates, whitespace, punctuation and numbering changes are ignored; changes to financial figures remain significant.

A changed paragraph is not evidence that risk increased or decreased. An unchanged paragraph does not establish that risk stayed the same.

Added paragraphs (5)

Current report

other transfers of value provided to physicians and teaching hospitals and certain ownership and investment interests held by physicians or their immediate family members in applicable manufacturers and group purchasing organizations; applicable manufacturers are also required to report such information regarding payments and transfers of value provided, as well as ownership and investment interests held, to physician assistants, nurse practitioners, clinical nurse specialists, certified nurse anesthetists, and certified nurse-midwives;

Current report

If the Company does not regain compliance with the Bid Price Rule by October 12, 2026, the Company may be eligible for an additional 180-calendar day compliance period so long as it satisfies the criteria for initial listing on Nasdaq and the continued listing requirement for market value of publicly held shares and the Company provides written notice to Nasdaq of its intention to cure the deficiency during the second compliance period by effecting a reverse stock split, if necessary. In the event the Company is not eligible for the second grace period, Nasdaq staff will provide written notice that the Company’s common stock is subject to delisting; however, the Company may request a hearing before the Nasdaq Hearings Panel (the “Panel”), which request, if timely made, would stay any further suspension or delisting action by the Staff pending the conclusion of the hearing process and expiration of any extension that may be granted by the Panel.

Current report

In addition to the Bid Price Rule, on July 22, 2026, the Securities and Exchange Commission (the “SEC”) approved a Nasdaq rule change that adopts a new continued listing requirement obligating companies listed on the Nasdaq Capital Market to maintain a minimum Market Value of Listed Securities (“MVLS”) of at least $5 million (the “MVLS Requirement”). Although the SEC subsequently stayed the implementation of the MVLS Requirement on July 29, 2026, it is possible that the new rule may become effective in the near-term. The MVLS Requirement is set forth in new Nasdaq Listing Rule 5550(a)(6).

Current report

The consequences of failing to comply with the MVLS Requirement differ materially from, and are more severe than, those applicable to the Bid Price Rule. Unlike the Bid Price Rule, a company that fails to comply with the MVLS Requirement is not entitled to any cure or compliance period. Instead, if a company’s MVLS remains below $5 million for a period of 30 consecutive business days, Nasdaq will issue a Staff Delisting Determination and the company’s securities will be immediately subject to suspension and delisting. Furthermore, a timely request for a hearing before the Panel will not stay the suspension of the company’s securities from trading pending the issuance of a written decision by the Panel, and the company’s securities would generally trade in the over-the-counter market during the pendency of any such appeal. Although the Panel may reverse a delisting determination that it finds was made in error, or grant an exception for a period not to exceed 180 days from the Staff Delisting Determination for the company to demonstrate that it meets all requirements for initial listing (which are generally higher than the continued listing requirements), there can be no assurance that the Panel would grant any such exception or that we would be able to satisfy the initial listing standards; and in any event, our stock would not be traded on the Nasdaq Capital Market during such period.

Current report

As of the time of this filing, our MVLS is currently below $5 million. Because we are currently below the $5 million MVLS threshold, if and when the MVLS Requirement becomes effective, we may become subject to immediate suspension and delisting, without any opportunity to cure, if our MVLS remains below $5 million for 30 consecutive business days.
Reworded paragraphs (7)

Previous wording

We have a limited operating history. We have focused primarily on organizing, acquiring, developing and securing our proprietary technology and identifying and obtaining preclinical data for various product candidates, with the goal of supporting regulatory approval for these product candidates. We have incurred losses since our inception in March 2015. Our net losses were $1.0 million and $0.2 million for the three months ended March 31, 2026 and 2025, respectively, and we had an accumulated deficit of $399.6 million as of March 31, 2026. We expect to continue to incur significant operating losses for the foreseeable future. We also do not anticipate that we will achieve profitability for a period of time after generating material revenues, if ever. If we are unable to generate revenues, we will not become profitable and may be unable to continue operations without continued funding.

Current wording

We have a limited operating history. We have focused primarily on organizing, acquiring, developing and securing our proprietary technology and identifying and obtaining preclinical data for various product candidates, with the goal of supporting regulatory approval for these product candidates. We have incurred losses since our inception in March 2015. Our net losses were $2.0 million and $0.9 million for the six months ended June 30, 2026 and 2025, respectively, and we had an accumulated deficit of $400.7 million as of June 30, 2026. We expect to continue to incur significant operating losses for the foreseeable future. We also do not anticipate that we will achieve profitability for a period of time after generating material revenues, if ever. If we are unable to generate revenues, we will not become profitable and may be unable to continue operations without continued funding.

Previous wording

Since our inception, we have incurred substantial operating losses and expect to continue to incur significant operating losses for the foreseeable future, and we may never become profitable. To date, we have not generated positive cash flows from operations and have funded our operations primarily with the proceeds from sales of equity securities. As of March 31, 2026, we had an accumulated deficit of $399.6 million, and cash and cash equivalents of $16.3 million.

Current wording

Since our inception, we have incurred substantial operating losses and expect to continue to incur significant operating losses for the foreseeable future, and we may never become profitable. To date, we have not generated positive cash flows from operations and have funded our operations primarily with the proceeds from sales of equity securities. As of June 30, 2026, we had an accumulated deficit of $400.7 million, and cash and cash equivalents of $15.2 million.

Previous wording

Under the terms of the Second Amended and Restated Founders Agreement (the “Founders Agreement”), which became effective July 22, 2016, Fortress will receive a grant of shares of our common stock equal to two and one-half percent (2.5%) of the gross amount of any equity or debt financing. Additionally, the Class A Preferred Stock, as a class, will receive an annual dividend on January 1st, payable in shares of common stock in an amount equal to two and one-half percent (2.5%) of our fully-diluted outstanding capital stock as of the business day immediately prior to January 1st of such year. Fortress currently owns all outstanding shares of Class A Preferred Stock. These share issuances to Fortress and any other holder of Class A Preferred Stock will dilute your holdings in our common stock and, if the value of our Company has not grown proportionately over the prior year, would result in a reduction in the value of your shares. The Founders Agreement has a term of 15 years and renews automatically for subsequent one-year periods unless terminated by Fortress or upon a Change in Control (as defined in the Founders Agreement).

Current wording

Under the terms of the Founders Agreement, Fortress will receive a grant of shares of our common stock equal to two and one-half percent (2.5%) of the gross amount of any equity or debt financing. Additionally, the Class A Preferred Stock, as a class, will receive an annual dividend on January 1st, payable in shares of common stock in an amount equal to two and one-half percent (2.5%) of our fully-diluted outstanding capital stock as of the business day immediately prior to January 1st of such year. Fortress currently owns all outstanding shares of Class A Preferred Stock. These share issuances to Fortress and any other holder of Class A Preferred Stock will dilute your holdings in our common stock and, if the value of our Company has not grown proportionately over the prior year, would result in a reduction in the value of your shares. The Founders Agreement has a term of 15 years and renews automatically for subsequent one-year periods unless terminated by Fortress or upon a Change in Control (as defined in the Founders Agreement).

Previous wording

Additionally, trade policies and geopolitical disputes and other international conflicts can result in tariffs, sanctions and other measures that restrict international trade, and can materially adversely affect our business, particularly if these measures occur in regions where drug products are manufactured or raw materials are sourced. For example, tensions between the United States and China have led to a series of tariffs being imposed by the United States on imports from China mainland, as well as other business restrictions. Countries may also adopt other measures, such as controls on imports or exports of goods, technology or data, that could adversely impact our operations and supply chain. As these tensions continue to rise, more targeted approaches by the U.S. or Chinese governments on certain products, industries or companies could significantly impact our development and commercialization efforts. The U.S. government may impose additional or higher tariffs, sanctions or other trade restrictions on goods imported from China and other countries which could increase the cost of goods needed to commercialize any products for which we obtain marketing authorization and continue development of our product candidates. Further, such actions by the U.S. could result in retaliatory action by those countries which could impact our ability to profitably commercialize any products for which we obtain marketing authorization in those jurisdictions. As a result, our business, operations, and financial condition could be materially harmed.

Current wording

Additionally, trade policies and geopolitical disputes and other international conflicts can result in tariffs, sanctions and other measures that restrict international trade, and can materially adversely affect our business, particularly if these measures occur in regions where drug products are manufactured or raw materials are sourced. For example, tensions between the United States and China have led to a series of tariffs being imposed by the United States on imports from mainland China, as well as other business restrictions. Countries may also adopt other measures, such as controls on imports or exports of goods, technology or data, that could adversely impact our operations and supply chain. As these tensions continue to rise, more targeted approaches by the U.S. or Chinese governments on certain products, industries or companies could significantly impact our development and commercialization efforts. The U.S. government may impose additional or higher tariffs, sanctions or other trade restrictions on goods imported from China and other countries which could increase the cost of goods needed to commercialize any products for which we obtain marketing authorization and continue development of our product candidates. Further, such actions by the U.S. could result in retaliatory action by those countries which could impact our ability to profitably commercialize any products for which we obtain marketing authorization in those jurisdictions. As a result, our business, operations, and financial condition could be materially harmed.

Previous wording

Our common stock is listed on the Nasdaq Capital Market under the symbol “MBIO.” The Nasdaq Capital Market requires that listed companies satisfy continued listing standards to maintain their listing. We are currently not in compliance with certain standards for continued listing on the Nasdaq Capital Market, namely, the minimum bid price requirement (the “Bid Price Rule”).

Current wording

Our common stock is listed on the Nasdaq Capital Market under the symbol “MBIO.” The Nasdaq Capital Market requires that listed companies satisfy continued listing standards to maintain their listing. We are currently not in compliance with certain standards for continued listing on the Nasdaq Capital Market, namely, Nasdaq Listing Rule 5550(a)(2), which sets forth the minimum bid price requirement for continued listing on the Nasdaq Capital Market (the “Bid Price Rule”), and as described below, we may not be in compliance with the newly adopted minimum Market Value of Listed Securities requirement, if and when such rule becomes effective.

Previous wording

On April 15, 2026, we received a notice from the Staff of Nasdaq’s Listing Qualifications Department (the “Staff”) indicating that the bid price of our common stock had closed below $1.00 for 30 consecutive business days and, as a result, we were not in compliance with the Bid Price Rule. Pursuant to Nasdaq Listing Rule 5810(c)(3)(A), we have been afforded a 180-calendar day grace period, or until October 12, 2026, to regain compliance with the Bid Price Rule, which necessitates a closing bid price of at least $1.00 per share for a minimum of ten consecutive business days (but generally not more than 20 consecutive business days) by October 12, 2026.

Current wording

Pursuant to Nasdaq Listing Rule 5810(c)(3)(A), we have been afforded a 180-calendar day grace period, or until October 12, 2026, to regain compliance with the Bid Price Rule, which necessitates a closing bid price of at least $1.00 per share for a minimum of ten consecutive business days (but generally not more than 20 consecutive business days) by October 12, 2026.

Previous wording

There can be no assurance that we will be able to regain compliance with Nasdaq’s continued listing rules. If we are unable to regain compliance, we may be delisted from Nasdaq. In the event we are delisted from Nasdaq, there can be no assurance that our common stock will be eligible for trading on another stock exchange or quotation on an over-the-counter market. If we are not able to obtain a listing on another stock exchange or quotation service for our common stock, it may be extremely difficult or impossible for stockholders to sell their shares. Additionally, if we are delisted from Nasdaq, but obtain a substitute listing or quotation service for our common stock, it will likely be on a market with less liquidity and our common stock may therefore experience potentially more price volatility than it has historically experienced on Nasdaq. Stockholders may not be able to sell their shares of common stock on any such substitute market in the quantities, at the times, or at the prices that could potentially be available on a more liquid trading market. As a result of these factors, if our common stock is delisted from Nasdaq, the value and liquidity of our common stock would likely be adversely affected. A delisting of our common stock from Nasdaq could also adversely affect our ability to obtain financing for our operations and/or result in a loss of confidence by investors, employees and/or business partners.

Current wording

There can be no assurance that we will be able to regain compliance with Nasdaq’s continued listing rules. If we are unable to regain compliance, we may be delisted from Nasdaq, and in the case of the MVLS Requirement, if and when it becomes effective, any such suspension and delisting could occur immediately and without a compliance period. In the event we are delisted from Nasdaq, there can be no assurance that our common stock will be eligible for trading on another stock exchange or quotation on an over-the-counter market. If we are not able to obtain a listing on another stock exchange or quotation service for our common stock, it may be extremely difficult or impossible for stockholders to sell their shares. Additionally, if we are delisted from Nasdaq, but obtain a substitute listing or quotation service for our common stock, it will likely be on a market with less liquidity, and our common stock may therefore experience potentially more price volatility than it has historically experienced on Nasdaq. Stockholders may not be able to sell their shares of common stock on any such substitute market in the quantities, at the times, or at the prices that could potentially be available on a more liquid trading market. As a result of these factors, if our common stock is delisted from Nasdaq, the value and liquidity of our common stock would likely be adversely affected. A delisting of our common stock from Nasdaq could also adversely affect our ability to obtain financing for our operations and/or result in a loss of confidence by investors, employees and/or business partners.
Rearranged current paragraphs (1)

Current report — wording carried from elsewhere

On April 15, 2026, we received a notice (the “Letter”) from the Listing Qualifications Department (the “Staff”) of Nasdaq indicating that the bid price of our common stock had closed below $1.00 for 30 consecutive business days and, as a result, we were not in compliance with the Bid Price Rule. The Letter has no immediate effect on the listing of the Company’s Common Stock on Nasdaq.