Mustang Bio, Inc. (MBIO) Ownership
MBIO ownership summary
as of October 18, 2026- Institutions
- 9.9% of shares outstanding
- Insiders
- 8.02% of shares outstanding
- Shares outstanding
- 6.7M
- Float
- 6.2M shares available to trade
- Short interest
- 0.78% 53K shares short
- Days to cover
- 1.96 short interest down 10.0% vs prior month
- Institutions 9.93%
- Insiders 8.02%
- Other investors 82.05%
MBIO top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Kestra Advisory Services, LLC | 2.60% | 197K | $74,069 | +20,949 (+11.9%) | June 30, 2026 |
| 2 | BlackRock Inc | 1.12% | 85K | $31,864 | — | June 30, 2026 |
| 3 | Citadel Advisors Llc | 0.78% | 59K | $22,357 | +6,259 (+11.8%) | June 30, 2026 |
| 4 | Geode Capital Management, LLC | 0.56% | 42K | $15,882 | −50,550 (−54.5%) | June 30, 2026 |
| 5 | CFO4Life Group, LLC | 0.44% | 34K | $12,600 | +13,049 (+63.8%) | June 30, 2026 |
| 6 | Vanguard Fiduciary Trust Co | 0.42% | 32K | $12,077 | — | June 30, 2026 |
| 7 | Vanguard Capital Management, LLC | 0.34% | 26K | $9,665 | — | June 30, 2026 |
| 8 | XTX Topco Ltd | 0.19% | 15K | $5,508 | +14,648 (0.0%) | June 30, 2026 |
| 9 | Virtu Financial LLC | 0.19% | 14K | $5,398 | +14,356 (0.0%) | June 30, 2026 |
| 10 | TWO SIGMA SECURITIES, LLC | 0.18% | 14K | $5,167 | +13,742 (0.0%) | June 30, 2026 |
| 11 | Susquehanna International Group, LLP | 0.18% | 14K | $5,138 | +13,664 (0.0%) | June 30, 2026 |
| 12 | UBS Group AG | 0.05% | 4,155 | $1,562 | +496 (+13.6%) | June 30, 2026 |
| 13 | Tower Research Capital LLC | 0.03% | 1,895 | $713 | — | June 30, 2026 |
| 14 | Barclays PLC | 0.01% | 1,121 | $421 | +1,121 (0.0%) | June 30, 2026 |
| 15 | SBI Securities Co Ltd | 0.01% | 509 | $191 | — | June 30, 2026 |
| 16 | Morgan Stanley - Brokerage Accounts | <0.01% | 118 | $44 | — | June 30, 2026 |
| 17 | Cullen/Frost Bankers Inc | <0.01% | 13 | $5 | — | June 30, 2026 |
| 18 | BNP Paribas Arbitrage, SA | <0.01% | 6 | $2 | — | June 30, 2026 |
| 19 | Nbc Securities Inc | 0.00% | 3 | $1 | — | June 30, 2026 |
| 20 | Danske Bank A/S. | 0.00% | 2 | $1 | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 9 holders added 98K shares and 1 cut 51K.
MBIO top mutual fund and ETF holders
4 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Extended Market Index | 0.45% | 34K | $12,729 | −182 (−0.5%) | August 31, 2026 |
| 2 | Fidelity Series Total Market Index | 0.06% | 4,184 | $1,573 | — | August 31, 2026 |
| 3 | Fidelity Total Market Index | 0.01% | 1,077 | $405 | — | August 31, 2026 |
| 4 | Nomura Healthcare Fund Class I | <0.01% | 160 | $60 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
MBIO insider transactions
latest 3| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-12-30 | Adam J Chill | Sell | $0.95 | 4 | $4 |
| 2025-12-30 | David Jin | Buy | $0.96 | 247 | $237 |
| 2025-12-30 | Neil Herskowitz | Sell | $0.96 | 247 | $237 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
MBIO shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns MBIO
Institutional investors own 9.9% of Mustang Bio's shares and insiders 8.02%. The largest holder is Kestra Advisory Services, LLC with 2.60% of the shares (197K), as of June 30, 2026. Among the top 20 institutions, 9 added shares and 1 reduced their stake in the latest filings. Short interest is 0.78% of the float, or 1.96 days of average trading volume. The share count rose 504.5% since 2015.
Related: MBIO analyst forecast, MBIO key metrics. See the MBIO stock overview for the latest quote and news.
MBIO ownership FAQ
Who owns the most Mustang Bio stock?
The largest shareholders of Mustang Bio are Kestra Advisory Services, LLC (2.60%), BlackRock Inc (1.12%), Citadel Advisors Llc (0.78%), Geode Capital Management, LLC (0.56%), CFO4Life Group, LLC (0.44%).
What percentage of Mustang Bio is owned by institutions?
Institutions hold 9.9% of Mustang Bio's shares outstanding; insiders hold 8.02%.
Which funds own Mustang Bio?
The largest fund holders of Mustang Bio are Fidelity Extended Market Index (0.45%), Fidelity Series Total Market Index (0.06%), Fidelity Total Market Index (0.01%), Nomura Healthcare Fund Class I (<0.01%).
What is Mustang Bio's short interest?
53K shares of Mustang Bio were sold short, 0.78% of the float; at the average daily volume it would take 1.96 days to cover.
Are insiders buying or selling Mustang Bio?
Of the latest 3 reported insider transactions in Mustang Bio (since December 30, 2025), 1 were purchases and 2 were sales.
How many shares of Mustang Bio are outstanding?
Mustang Bio has 6.7M shares outstanding, of which 6.2M are in the public float.