Castellum CTM Insider Ownership

NYSE CTM

$0.58 +0.01 (+1.97%)

As of: Oct 20, 2026 · 3:59 PM EDT

Insider Holdings by Owner

16.71Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

34.43%

▲+0.058% pp QoQ

Shares Held by Insiders

32.61Mn

filed for Sep 2026

▲+0.17% QoQ

Shares Outstanding

94.70Mn

94,698,939 shares

Direct Holdings

14.65Mn

Indirect: 17.96Mn

Net Shares Traded (QoQ)

+54.87K

net buying 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

Across the past 12 months, open-market trades by Castellum insiders totaled $45,697 in purchases (72.56K shares) and $768,310 in sales (694K shares).

Castellum's open-market purchases in the past 12 months came from 3 insiders, and its sales from 2 insiders.
Among Castellum insiders, Andrew Merriman (Chief Operating Officer) led open-market buying over the past 12 months with $35,399 of purchases (56.4K shares); the latest was on October 1, 2026.
On the sell side, Jay O. Wright (General Counsel, Secretary) led open-market sales of Castellum stock over the past 12 months with $703,082 (609K shares), most recently on December 19, 2025.
The latest open-market trade in CTM stock by an insider was a purchase of 1.7K shares for $910 by Glen R. Ives (President) on October 1, 2026.
In transactions other than open-market trades, Castellum insiders received 1.33K shares in stock awards over the past 12 months.
Per Business Quant data, Castellum insiders hold 32.61Mn shares in total based on their latest Form 4 filings, up 0.19% from 32.55Mn shares at the end of Q2 2026 and up 0.37% from 32.49Mn shares at the end of Q3 2025.
Of the 32.61Mn shares held by Castellum insiders, 14.65Mn shares (44.92%) are held directly and 17.96Mn shares (55.08%) indirectly, through trusts, partnerships, family members and other entities.
Holdings in Castellum stock are reported by 10 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
Castellum's top three insider holders by shares held are Jay O. Wright (General Counsel, Secretary, 16.23Mn shares), Mark C. Fuller (14.98Mn shares) and Andrew Merriman (Chief Operating Officer, 589.93K shares).
Of the shares held by CTM insiders, 49.78% belong to Jay O. Wright.
Institutions accounted for 8.35% of CTM's outstanding shares in Q2 2026, insiders about 34.44% per their latest Form 4 filings, and other investors, including the public, about 57.21%.
A total of 31 Form 4 filings with transactions in Castellum stock were made over the past 12 months, by 9 insiders.
The insider data for CTM reflects Form 4 filings through October 1, 2026.

Form 4 Holdings

Insiders Holding CTM

Insiders 12

Shares held 16.71Mn

Of outstanding 17.65%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	Jay O Wright	General Counsel, Secretary	7,134,973	7,134,973	42.7%	22 Dec, 2025
2	Mark C Fuller	Ceo, President	6,113,659	6,113,659	36.6%	03 Sep, 2025
3	Emil Kaunitz	Director	1,999,856	1,999,856	12.0%	21 Dec, 2022
4	Andrew Merriman	Chief Operating Officer	589,927	589,927	3.5%	01 Oct, 2026
5	Charles Thomas Mcmillen	Director	231,015	231,015	1.4%	27 Mar, 2026
6	Glen R Ives	President	202,578	202,578	1.2%	01 Oct, 2026
7	John Francis Campbell	Director	126,537	126,537	0.8%	23 Mar, 2023
8	Mark S Alarie	Director	112,920	112,920	0.7%	23 Mar, 2023
9	Bernard S Champoux	Director, Other	104,536	104,536	0.6%	23 Mar, 2023
10	Patricia Frost	Director	62,920	62,920	0.4%	23 Mar, 2023
11	David T Bell	Chief Financial Officer	18,651	18,651	0.1%	01 Oct, 2026
12	Tammy L Martin	General Counsel And Secretary	16,427	16,427	0.1%	01 Oct, 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

149 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
01 Oct, 2026	Andrew Merriman	Chief Operating Officer	Acquired P	1,396	$0.54	$747	589,927	Direct
01 Oct, 2026	David T Bell	Chief Financial Officer	Acquired P	1,396	$0.54	$747	18,651	Direct
01 Oct, 2026	Tammy L Martin	General Counsel And Secretary	Acquired P	1,396	$0.54	$747	16,427	Direct
01 Oct, 2026	Glen R Ives	President	Acquired P	1,700	$0.54	$910	202,578	Direct
09 Sep, 2026	Andrew Merriman	Chief Operating Officer	Acquired P	40,000	$0.62	$24.77K	578,531	Direct
09 Sep, 2026	Andrew Merriman	Chief Operating Officer	Acquired P	10,000	$0.62	$6.20K	588,531	Direct
01 Jul, 2026	David T Bell	Chief Financial Officer	Acquired P	1,202	$0.61	$736	17,255	Direct
01 Jul, 2026	Tammy L Martin	General Counsel And Secretary	Acquired P	1,202	$0.61	$736	15,031	Direct
01 Jul, 2026	Glen R Ives	President	Acquired P	1,262	$0.61	$772	200,878	Direct
01 Jul, 2026	Andrew Merriman	Chief Operating Officer	Acquired P	1,202	$0.61	$736	538,531	Direct
01 Jul, 2026	Glen R Ives	President	Acquired A	773,630	—	—	773,630	Direct
31 Mar, 2026	Andrew Merriman	Chief Operating Officer	Acquired A	1,329	$0.45	$604	537,329	Direct
31 Mar, 2026	Tammy L Martin	General Counsel And Secretary	Acquired A	1,329	$0.45	$604	13,829	Direct
31 Mar, 2026	David T Bell	Chief Financial Officer	Acquired A	1,329	$0.45	$604	16,053	Direct
27 Mar, 2026	Andrew Merriman	Chief Operating Officer	Acquired P	2,000	$0.64	$1.29K	536,000	Direct
25 Mar, 2026	Charles Thomas Mcmillen	Director	Disposed S	30,000	$0.70	$21.13K	231,015	Direct
27 Mar, 2026	Glen R Ives	President	Acquired P	2,000	$0.62	$1.23K	199,616	Direct
26 Mar, 2026	Glen R Ives	President	Acquired P	10,000	$0.66	$6.65K	197,616	Direct
18 Mar, 2026	Charles Thomas Mcmillen	Director	Disposed S	55,000	$0.80	$44.10K	261,015	Direct
18 Mar, 2026	Andrew Merriman	Chief Operating Officer	Acquired P	3,000	$0.80	$2.39K	534,000	Direct

Showing 1 to 20 of 149 transactions