Mustang Bio MBIO Insider Ownership

NASDAQ MBIO

$0.40 +0.02 (+5.65%)

As of: Oct 21, 2026 · 11:39 AM EDT

Insider Holdings by Owner

545.46K Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

8.01%

■0% pp QoQ

Shares Held by Insiders

539.00K

filed for Sep 2026

■0.00% QoQ

Shares Outstanding

6.73Mn

6,732,970 shares

Direct Holdings

539.00K

Indirect: 0

Net Shares Traded (QoQ)

no net change in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 5, 2026

In the last 12 months, insiders at Mustang Bio made open-market purchases of $238 (247 shares) and open-market sales of $241 (251 shares).

Mustang Bio's open-market purchases in the past 12 months came from one insider, and its sales from 2 insiders.
Among MBIO insiders, David Jin (Director) bought the most stock on the open market in the past 12 months: $238 (247 shares), most recently on December 30, 2025.
On the selling side, Neil Herskowitz (Director) was the top open-market seller of Mustang Bio over the past 12 months, with $238 sold (247 shares) and the latest sale on December 30, 2025.
Apart from open-market trades, MBIO insiders received 278.38K shares in stock awards and gave up 19 shares to cover taxes or exercise prices in the past 12 months.
Per Business Quant data, Mustang Bio insiders hold 539K shares in total based on their latest Form 4 filings, unchanged from 539K shares at the end of Q2 2026 and up 107.45% from 259.83K shares at the end of Q3 2025.
All of the 539K shares held by Mustang Bio insiders are held directly, none through trusts, partnerships or other entities.
The insider holdings in Mustang Bio belong to 5 insiders who have reported on Form 4 within the past two years.
Mustang Bio's three largest insider shareholders, based on their latest Form 4 filings, are Fortress Biotech, Inc. (10% owner, 536.58K shares), Manuel Litchman (President, CEO and Interim CFO, 1.61K shares) and Adam J. Chill (Director, 375 shares).
The holding of Fortress Biotech, Inc. makes up 99.55% of all shares held by Mustang Bio insiders.
Institutional holders reported 8.01% of Mustang Bio's outstanding shares for Q2 2026; insiders' latest Form 4 filings put their stake at about 8.01%, and other investors, including the public, hold the remaining 83.98%.
Over the trailing 12 months, 5 insiders reported transactions in MBIO stock across 5 Form 4 filings.
Insider figures for MBIO include Form 4 filings through April 27, 2026.

Form 4 Holdings

Insiders Holding MBIO

Insiders 8

Shares held 545.46K

Of outstanding 8.10%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Biotech, Inc. Fortress	TenPercentOwner	536,577	0	536,577	98.4%	05 Jan, 2026
2	Manuel Md Litchman	President, Ceo And Interim Cfo	5,497	0	5,497	1.0%	27 Apr, 2026
3	Lindsay A Md Rosenwald	Director	1,211	0	1,211	0.2%	07 Jul, 2023
4	Michael S Weiss	Director	0	993	993	0.2%	07 Jul, 2023
5	Michael J Zelefsky	Director	379	0	379	0.1%	07 Jul, 2023
6	Adam J. Chill	Director	375	0	375	0.1%	30 Dec, 2025
7	David Jin	Director	286	0	286	0.1%	30 Dec, 2025
8	Neil Herskowitz	Director	145	0	145	0.0%	30 Dec, 2025

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

53 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
24 Apr, 2026	Manuel Md Litchman	President, Ceo And Interim Cfo	Disposed F	19	$0.75	$14	1,615	Direct
02 Jan, 2026	Biotech, Inc. Fortress	TenPercentOwner	Acquired A	278,385	$0.00	$0	536,577	Direct
30 Dec, 2025	Neil Herskowitz	Director	Disposed S	247	$0.96	$238	145	Direct
30 Dec, 2025	David Jin	Director	Acquired P	247	$0.96	$238	286	Direct
30 Dec, 2025	Adam J. Chill	Director	Disposed S	4	$0.95	$4	375	Direct
29 Sep, 2025	Biotech, Inc. Fortress	TenPercentOwner	Acquired A	59,334	$0.00	$0	258,192	Direct
24 Apr, 2025	Manuel Md Litchman	President, Ceo And Interim Cfo	Disposed F	27	$1.24	$33	1,634	Direct
31 Mar, 2025	Biotech, Inc. Fortress	TenPercentOwner	Acquired A	67,806	$0.00	$0	198,858	Direct
27 Jun, 2024	Biotech, Inc. Fortress	TenPercentOwner	Acquired A	575,191	$0.00	$0	50,060	Direct
31 May, 2024	Manuel Md Litchman	President And Ceo	Disposed F	1,396	$17.50	$24.43K	1,660	Direct
02 Jan, 2024	Biotech, Inc. Fortress	TenPercentOwner	Acquired A	419,092	$0.00	$0	38,556	Direct
05 Jul, 2023	Adam J. Chill	Director	Acquired A	7,246	$0.00	$0	383	Direct
05 Jul, 2023	Neil Herskowitz	Director	Acquired A	7,246	$0.00	$0	394	Direct
05 Jul, 2023	Lindsay A Md Rosenwald	Director	Acquired A	7,246	$0.00	$0	1,211	Direct
05 Jul, 2023	Michael S Weiss	Director	Acquired A	7,246	$0.00	$0	993	Indirect
24 Apr, 2023	Manuel Md Litchman	President And Ceo	Acquired A	5,000	$0.00	$0	2,222	Direct
05 Jul, 2023	Michael J Zelefsky	Director	Acquired A	7,246	$0.00	$0	379	Direct
06 Jan, 2023	Biotech, Inc. Fortress	TenPercentOwner	Acquired A	2,807,008	$0.00	$0	30,176	Direct
08 Dec, 2021	Brian Achenbach	Svp, Fin. Corp. Controller	Acquired A	22,500	$0.00	$0	199	Direct
14 Dec, 2021	Brian Achenbach	Svp, Fin. Corp. Controller	Disposed S	4,374	$1,372.43	$6.00Mn	193	Direct

Showing 1 to 20 of 53 transactions