Castellum, Inc.

CTM

Exchange: NYSE
Industry: Services-Management Consulting Services
SEC CIK: 0001877939

SEC filings (opens in a new tab)

In the last 90 days, Castellum, Inc. insiders filed 6 open-market purchases and 0 sales; 35 institutions reported holding it in 13F filings for Q2 2026, worth $5.69M in total; no superinvestor holds it.

Key figures

Market capClose on Nov 11, 2026: $47.5M
Insider buysLast 90 days, $56.0K in total: 6
Insider sellsOpen market, last 90 days: 0
13F holdersQ2 2026, +8 vs. previous quarter: 35
13F valueReported value at the end of Q2 2026: $5.69M
Superinvestors holdingAt the end of Q2 2026: 0

Price chart

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Financials

See financial statements

From SEC filings, in USD.

Revenue, FY2025: $52.9M; +18.1% year over year
Net income, FY2025: -$2.40M; No comparable prior period
Free cash flow, FY2025: -$2.10M; −288.0% year over year
Revenue, Q3 FY2026: $14.7M; +0.6% year over year

Revenue flow, FY2025

Green is profit; orange is costs, expenses and taxes. Percentages are shares of revenue.

Net loss for FY2025: $2.40M (4.5% of revenue).

Short interest

See short data

From FINRA, settlement date Oct 30, 2026.

Short interest: 5.82M; Shares sold short
Change: −225.6K; −3.7% vs. previous
Days to cover: 15.69; At average daily volume

Superinvestors holding CTM, Q2 2026

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No superinvestor reported holding CTM at the end of Q2 2026.

Latest insider trades

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Open-market purchases and sales by Castellum, Inc. insiders from Form 4, newest first.

Insider trades
Filed (ET)	Trade date	Filing delay	Insider	Transaction	Shares	Avg price	Value	Holding change	Flags
Nov 10, 2026 (view filing)4:05 PM ET	Nov 10	Same day	Merriman AndrewChief Operating Officer	PPurchase	+50.0K	$0.4371	+$21.9K	+8.5%639.9K after
Oct 1, 2026 (view filing)4:09 PM ET	Oct 1	Same day	Martin Tammy LGeneral Counsel and Secretary	PPurchase	+1.40K	$0.5352	+$747.14	+9.3%16.4K after
Oct 1, 2026 (view filing)4:09 PM ET	Oct 1	Same day	Bell David TChief Financial Officer	PPurchase	+1.40K	$0.5352	+$747.14	+8.1%18.7K after
Oct 1, 2026 (view filing)4:08 PM ET	Oct 1	Same day	Merriman AndrewChief Operating Officer	PPurchase	+1.40K	$0.5352	+$747.14	+0.2%589.9K after
Oct 1, 2026 (view filing)4:08 PM ET	Oct 1	Same day	Ives Glen RPresident	PPurchase	+1.70K	$0.5352	+$909.84	+0.8%202.6K after
Sep 9, 2026 (view filing)4:02 PM ET	Sep 9	Same day	Merriman AndrewChief Operating Officer	PPurchase	+50.0K	$0.6194	+$31.0K	+9.3%588.5K after	2 lots
Jul 2, 2026 (view filing)4:07 PM ET	Jul 1	1 day	Merriman AndrewChief Operating Officer	PPurchase	+1.20K	$0.612	+$735.62	+0.2%538.5K after
Jul 2, 2026 (view filing)4:06 PM ET	Jul 1	1 day	Bell David TChief Financial Officer	PPurchase	+1.20K	$0.612	+$735.62	+7.5%17.3K after
Jul 2, 2026 (view filing)4:05 PM ET	Jul 1	1 day	Martin Tammy LGeneral Counsel and Secretary	PPurchase	+1.20K	$0.612	+$735.62	+8.7%15.0K after
Jul 2, 2026 (view filing)4:05 PM ET	Jul 1	1 day	Ives Glen RPresident	PPurchase	+1.26K	$0.612	+$772.34	+0.6%200.9K after

Top 10 13F holders, Q2 2026

See all 35 holders

The largest institutional positions in Castellum, Inc. at the end of Q2 2026; share changes are against Q1 2026.

Institutions holding CTM in Q2 2026
Institution	Shares	Value	% of portfolio	Change in shares	Action
Vanguard Capital Management LLC	3,093,768	$2.23M	0.00%	+12,511+0.4%	Added
Meridian Wealth Management, LLC	863,200	$621.4K	0.02%	+77,400+9.8%	Added
Geode Capital Management, LLC	816,037	$587.6K	0.00%	−128,862−13.6%	Reduced
Captrust Financial Advisors	626,100	$450.7K	0.00%	00.0%	Unchanged
Vanguard Fiduciary Trust Co	492,717	$354.8K	0.00%	+74,393+17.8%	Added
State Street Corp	303,900	$218.8K	0.00%	00.0%	Unchanged
BlackRock, Inc.	265,486	$191.1K	0.00%	00.0%	Unchanged
Savvy Advisors, Inc.	220,300	$158.6K	0.00%	−1,500−0.7%	Reduced
UBS Group AG	208,958	$150.4K	0.00%	+55,429+36.1%	Added
Northern Trust Corp	171,420	$123.4K	0.00%	−10,482−5.8%	Reduced