Mannkind MNKD Insider Ownership

NASDAQ MNKD

$3.09 -0.01 (-0.48%)

As of: Oct 21, 2026 · 11:41 AM EDT

Insider Holdings by Owner

28.62Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

2.73%

▼-0.031% pp QoQ

Shares Held by Insiders

8.47Mn

filed for Sep 2026

▼-1.14% QoQ

Shares Outstanding

309.91Mn

309,911,682 shares

Direct Holdings

8.47Mn

Indirect: 0

Net Shares Traded (QoQ)

-97.36K

net selling 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 10, 2026

In the last 12 months, insiders at Mannkind made open-market purchases of $259,000 (100K shares) and open-market sales of $3.26 million (637.63K shares).

Behind Mannkind's open-market trades in the past 12 months were one insider buying and 5 insiders selling.
Among MNKD insiders, Michael Castagna (Chief Executive Officer) bought the most stock on the open market in the past 12 months: $259,000 (100K shares), most recently on March 10, 2026.
Meanwhile, the largest open-market sales of MNKD in the past 12 months were by Michael Castagna (Chief Executive Officer), totaling $1.25 million (215.84K shares), most recently on December 17, 2025.
Steven B. Binder (Director) made the most recent open-market trade by an insider of Mannkind, a sale of 39.05K shares for $128,478 on September 25, 2026.
Away from the open market, MNKD insiders received 437.86K shares in stock awards, acquired 878.22K shares through option exercises and conversions, gave up 703.24K shares to cover taxes or exercise prices and gave away 44.17K shares as gifts over the last 12 months.
Business Quant data shows Mannkind insiders holding 8.47Mn shares in total in their latest Form 4 filings, down 1.14% from 8.57Mn shares at the end of Q2 2026 and down 2.67% from 8.7Mn shares at the end of Q3 2025.
None of the 8.47Mn shares held by Mannkind insiders is held through trusts, partnerships or family members; all are direct holdings.
Per Business Quant, 16 insiders of MNKD hold shares, counting officers, directors and 10% owners who have filed a Form 4 in the past two years.
Mannkind's three biggest insider holders are Michael Castagna (Chief Executive Officer, 2.43Mn shares), Stuart A. Tross (Chief People & Workpl Officer, 1.06Mn shares) and David Thomson (EVP Genl Counsel & Secretary, 797.55K shares), based on their latest Form 4 filings.
The holding of Michael Castagna makes up 28.73% of all shares held by Mannkind insiders.
Institutions held 58.62% of Mannkind's outstanding shares in their Q2 2026 13F filings, insiders about 2.73% based on their latest Form 4 filings, and other investors, including the public, the remaining 38.65%.
In the past year, 15 insiders of Mannkind submitted 48 Form 4 filings reporting trades, awards or other transactions.
The insider holdings and trades above for Mannkind reflect Form 4 filings through September 28, 2026.

Form 4 Holdings

Insiders Holding MNKD

Insiders 18

Shares held 28.62Mn

Of outstanding 9.24%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	Michael Castagna	Chief Executive Officer	8,625,585	8,625,585	30.1%	17 Jul, 2026
2	Stuart A Tross	Chief People Workpl Officer	3,854,547	3,854,547	13.5%	17 Jul, 2026
3	Steven B. Binder	Evp Special Projects	3,299,914	3,299,914	11.5%	28 Sep, 2026
4	Alejandro Galindo	Evp Endocrine Business Unit	2,907,145	2,907,145	10.2%	23 Aug, 2022
5	David Thomson	Evp Genl Counsel Secretary	2,463,214	2,463,214	8.6%	17 Jul, 2026
6	Joseph Kocinsky	Chief Technology Officer	1,508,662	1,508,662	5.3%	29 Aug, 2022
7	Burkhard Blank	Evp Chief Medical Officer	1,167,696	1,167,696	4.1%	17 Jul, 2025
8	Sanjay R Singh	Evp Technical Operations	1,101,963	1,101,963	3.8%	17 Jul, 2026
9	Lauren M Sabella	Evp Operations	946,058	946,058	3.3%	17 Jul, 2025
10	Anthony C Hooper	Director	574,547	574,547	2.0%	03 Mar, 2026
11	Christopher B Prentiss	Chief Financial Officer	551,268	551,268	1.9%	17 Jul, 2026
12	Dominic Marasco	Pres, Endocrine Business Unit	343,398	343,398	1.2%	17 Jul, 2026
13	Ajay Ahuja	Chief Medical Officer	318,200	318,200	1.1%	12 Nov, 2025
14	Sabrina Kay	Director	265,600	265,600	0.9%	05 Feb, 2024
15	Christine Mundkur	Director	254,493	254,493	0.9%	28 Feb, 2022
16	Jennifer Grancio	Director	244,815	244,815	0.9%	28 Feb, 2022
17	Ronald J Consiglio	Director	132,342	132,342	0.5%	22 May, 2026
18	James Samuel Shannon	Director	64,635	64,635	0.2%	03 Mar, 2026

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

1,469 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
25 Sep, 2026	Steven B. Binder	Director	Disposed S	39,051	$3.29	$128.48K	713,258	Direct
10 Sep, 2026	Steven B. Binder	Director	Disposed S	33,558	$3.81	$127.86K	752,309	Direct
07 Aug, 2026	Steven B. Binder	Director	Disposed S	39,051	$4.06	$158.55K	785,867	Direct
15 Jul, 2026	Sanjay R Singh	Evp Technical Operations	Acquired M	70,550	$0.00	$0	525,761	Direct
15 Jul, 2026	Christopher B Prentiss	Chief Financial Officer	Disposed F	11,572	$4.09	$47.33K	329,343	Direct
15 Jul, 2026	David Thomson	Evp Genl Counsel Secretary	Acquired M	93,790	$0.00	$0	920,089	Direct
15 Jul, 2026	Michael Castagna	Chief Executive Officer	Acquired M	350,260	$0.00	$0	2,796,979	Direct
15 Jul, 2026	Steven B. Binder	Director	Acquired M	93,790	$0.00	$0	901,798	Direct
15 Jul, 2026	Stuart A Tross	Chief People Workpl Officer	Acquired M	93,790	$0.00	$0	1,123,950	Direct
15 Jul, 2026	Dominic Marasco	Pres, Endocrine Business Unit	Disposed F	3,623	$4.09	$14.82K	343,398	Direct
15 Jul, 2026	Stuart A Tross	Chief People Workpl Officer	Disposed F	33,652	$4.09	$137.64K	1,090,298	Direct
15 Jul, 2026	David Thomson	Evp Genl Counsel Secretary	Disposed F	51,632	$4.09	$211.17K	868,457	Direct
15 Jul, 2026	Christopher B Prentiss	Chief Financial Officer	Disposed F	10,675	$4.09	$43.66K	318,668	Direct
15 Jul, 2026	Sanjay R Singh	Evp Technical Operations	Disposed F	22,047	$4.09	$90.17K	503,714	Direct
15 Jul, 2026	Steven B. Binder	Director	Disposed F	15,688	$4.09	$64.16K	886,110	Direct
15 Jul, 2026	Michael Castagna	Chief Executive Officer	Disposed F	192,819	$4.09	$788.63K	2,604,160	Direct
15 Jul, 2026	Steven B. Binder	Director	Disposed F	4,073	$4.09	$16.66K	882,037	Direct
15 Jul, 2026	Stuart A Tross	Chief People Workpl Officer	Disposed F	8,253	$4.09	$33.75K	1,082,045	Direct
15 Jul, 2026	Sanjay R Singh	Evp Technical Operations	Disposed F	5,372	$4.09	$21.97K	498,342	Direct
15 Jul, 2026	Michael Castagna	Chief Executive Officer	Disposed F	47,481	$4.09	$194.20K	2,556,679	Direct

Showing 1 to 20 of 1,469 transactions