What SEC filings does Mustang Bio, Inc. submit to the SEC?

Mustang Bio, Inc. (MBIO) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about MBIO?

A Form 4 for MBIO discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from Mustang Bio, Inc.?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for MBIO?

The 10-K is Mustang Bio, Inc.'s annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all MBIO SEC filings directly on EDGAR?

You can view all historical Mustang Bio, Inc. filings on the SEC EDGAR company page for MBIO. Each filing card on this page links directly to the original SEC document.

How often does Mustang Bio, Inc. file with the SEC?

Mustang Bio, Inc. files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling MBIO shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

MBIO SEC Filing News — Mustang Bio, Inc.

Latest SEC filings for Mustang Bio, Inc. (MBIO) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-08-05.

Mustang Bio, Inc., a clinical-stage biopharmaceutical company, focuses on translating cell therapies into cures for difficult-to-treat cancers and autoimmune diseases in the United States. The company develops MB-106, a CD20-targeted chimeric antigen receptor (CAR) T cell therapy which is in Phase I clinical trail for non-hodgkin lymphoma, chronic lymphocytic leukemia, and autoimmune diseases; MB-109, a combination MB-101 and MB-108 as a potential treatment for IL13Ra2+ relapsed or refractory gl…

Sector: Healthcare Industry: Biotechnology Market Cap: $2.8M CIK: 1680048

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for MBIO currently lean bearish. Of the 12 filing records displayed, 2 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 1 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.

MBIO Filing Activity Snapshot 2025-10-01 — 2026-08-05

Insider Transactions (Form 4)

1 buy vs 2 sells

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$237.61

Herskowitz Neil (Director) · 2025-12-30

247 shares · Form 4

Insider Transactions 6 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 6 filings in this group are Form 4s for Mustang Bio, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 6 insider filings shown, the breakdown is 2 compensation award, 2 open-market sale, 1 open-market purchase and 1 tax withholding. 3 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Compensation award ×2: Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Open-market sale ×2: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Open-market purchase ×1: The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.
Tax withholding ×1: Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Form 4 Tax withholding Tax / Compensation Filing 2026-04-27

MBIO insider Form 4 filed for equity award, exercise, or tax withholding

Litchman Manuel MD (Director, President, CEO and Interim CFO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	19	$0.75	$14.25

Filing: Form 4 (Insider Transaction) Insider: Litchman Manuel MD (Director, President, CEO and Interim CFO) Shares: 19

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-01-05

MBIO insider Form 4 filed for equity award, exercise, or tax withholding

Fortress Biotech, Inc. (10% Owner) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	278,385	—	—

Filing: Form 4 (Insider Transaction) Insider: Fortress Biotech, Inc. (10% Owner) Shares: 278,385

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2025-12-30

MBIO insider Herskowitz Neil (Director) sold 247 shares (~$237.61)

Herskowitz Neil, listed as Director at MUSTANG BIO, INC., reported an open-market sale of 247 MBIO shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	247	$0.96	$237.61

Filing: Form 4 (Insider Transaction) Insider: Herskowitz Neil (Director) Shares: 247 Est. Value: $237.61

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2025-12-30

MBIO insider Chill Adam J. (Director) sold 4 shares (~$3.82)

Chill Adam J., listed as Director at MUSTANG BIO, INC., reported an open-market sale of 4 MBIO shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	4	$0.95	$3.82

Filing: Form 4 (Insider Transaction) Insider: Chill Adam J. (Director) Shares: 4 Est. Value: $3.82

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2025-12-30

MBIO insider Jin David (Director) bought 247 shares (~$237.61)

Jin David, listed as Director at MUSTANG BIO, INC., reported an open-market purchase of 247 MBIO shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	247	$0.96	$237.61

Filing: Form 4 (Insider Transaction) Insider: Jin David (Director) Shares: 247 Est. Value: $237.61

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2025-10-01

MBIO insider Form 4 filed for equity award, exercise, or tax withholding

Fortress Biotech, Inc. (10% Owner) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	59,334	—	—

Filing: Form 4 (Insider Transaction) Insider: Fortress Biotech, Inc. (10% Owner) Shares: 59,334

View on SEC EDGAR → Open Filing Document →

Material Events 2 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 2 in this period for Mustang Bio, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-04-17

MBIO filed 8-K — material company event

MUSTANG BIO, INC. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2025-12-23

MBIO filed 8-K — material company event

MUSTANG BIO, INC. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Periodic Reports 4 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 annual report (10-K) and 3 quarterly reports (10-Q) for Mustang Bio, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-05

MBIO filed Quarterly Report (10-Q)

MUSTANG BIO, INC. filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

Form 10-Q Quarterly Report 2026-05-05

MBIO filed Quarterly Report (10-Q)

MUSTANG BIO, INC. filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

Form 10-K Annual Report 2026-03-19

MBIO filed Annual Report (10-K)

MUSTANG BIO, INC. filed its annual report with the SEC. This report includes audited financial statements, business overview, risk factors, and management discussion.

Filing: 10-K (Annual Report)

View on SEC EDGAR → Open Filing Document →

Form 10-Q Quarterly Report 2025-11-07

MBIO filed Quarterly Report (10-Q)

MUSTANG BIO, INC. filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

How we classify Mustang Bio, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on MBIO. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — MBIO SEC Filings

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MBIO Full Analysis

Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.

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