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Castellum, Inc. (CTM) institutional ownership

Latest close $0.65 Jul 22, 2026
Market cap$69M 52-week range SectorTechnology
Funds holding · Q1 2026
33
reported CTM position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
10 buyers · 23 sellers

Castellum, Inc. (CTM) price and institutional activity

Dates

Q1 2026

$0 bought by 10 investors
Captrust Financial AdvisorsGeode +8 more
$0 sold by 23 investors
Essex Investment Management Co LLCUBS Group AG +21 more
Bought Sold Totals per quarter; hover a bar for the names.

Castellum, Inc. (CTM) institutional activity · 33

Investor Type Est. change Change Δ Own Date
Essex Investment Management Co LLC · Exited
Change −2.1M Δ Own −100.0% Date Q1 2026
Essex Investment Management Co LLC Exited· Q1 2026 −2.1M −100.0% Q1 2026
UBS Group AG · Reduced
Change −2.0M Date Q1 2026
UBS Group AG Reduced· Q1 2026 −2.0M Q1 2026
Legato Capital Management LLC · Exited
Change −681K Δ Own −100.0% Date Q1 2026
Legato Capital Management LLC Exited· Q1 2026 −681K −100.0% Q1 2026
Captrust Financial Advisors · New
Change +626K Date Q1 2026
Captrust Financial Advisors New· Q1 2026 +626K Q1 2026
Goldman Sachs Group Inc · Exited
Change −354K Δ Own −100.0% Date Q1 2026
Goldman Sachs Group Inc Exited· Q1 2026 −354K −100.0% Q1 2026
Quadrature Capital Ltd · Exited
Change −217K Δ Own −100.0% Date Q1 2026
Quadrature Capital Ltd Exited· Q1 2026 −217K −100.0% Q1 2026
Geode · Added
Change +171K Date Q1 2026
Geode Added· Q1 2026 +171K Q1 2026
Jane Street Group, LLC · Reduced
Change −107K Date Q1 2026
Jane Street Group, LLC Reduced· Q1 2026 −107K Q1 2026
Susquehanna International Group, LLP · Exited
Change −103K Δ Own −100.0% Date Q1 2026
Susquehanna International Group, LLP Exited· Q1 2026 −103K −100.0% Q1 2026
Bank of New York Mellon Corp · Exited
Change −100K Δ Own −100.0% Date Q1 2026
Bank of New York Mellon Corp Exited· Q1 2026 −100K −100.0% Q1 2026
Two Sigma Investments, LP · Exited
Change −75K Δ Own −100.0% Date Q1 2026
Two Sigma Investments, LP Exited· Q1 2026 −75K −100.0% Q1 2026
Vanguard · Added
Change +54K Date Q1 2026
Vanguard Added· Q1 2026 +54K Q1 2026
Inspire Advisors, LLC · Exited
Change −42K Δ Own −100.0% Date Q1 2026
Inspire Advisors, LLC Exited· Q1 2026 −42K −100.0% Q1 2026
Meridian Wealth Management, LLC · Added
Change +41K Date Q1 2026
Meridian Wealth Management, LLC Added· Q1 2026 +41K Q1 2026
Point72 Asset Management, L.P. · Exited
Change −35K Δ Own −100.0% Date Q1 2026
Point72 Asset Management, L.P. Exited· Q1 2026 −35K −100.0% Q1 2026
Data through Q1 2026 · filed May 15, 2026
15 of 33

Famous investor activity in Castellum, Inc. (CTM)

Castellum, Inc. (CTM) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Merriman Andrew · Officer Buy +$736
Price $0.61 Qty +1K Owned 539K ΔOwn +0.2% Trade date Jul 1, 2026 Filed date Jul 2, 2026
Merriman Andrew Officer Buy $0.61 +1K +$736 539K +0.2% Jul 1, 2026 Jul 2, 2026
Bell David T. · Officer Buy +$736
Price $0.61 Qty +1K Owned 17K ΔOwn +7.5% Trade date Jul 1, 2026 Filed date Jul 2, 2026
Bell David T. Officer Buy $0.61 +1K +$736 17K +7.5% Jul 1, 2026 Jul 2, 2026
Martin Tammy L. · Officer Buy +$736
Price $0.61 Qty +1K Owned 15K ΔOwn +8.7% Trade date Jul 1, 2026 Filed date Jul 2, 2026
Martin Tammy L. Officer Buy $0.61 +1K +$736 15K +8.7% Jul 1, 2026 Jul 2, 2026
Ives Glen R. · Officer Buy +$772
Price $0.61 Qty +1K Owned 201K ΔOwn +0.6% Trade date Jul 1, 2026 Filed date Jul 2, 2026
Ives Glen R. Officer Buy $0.61 +1K +$772 201K +0.6% Jul 1, 2026 Jul 2, 2026
Ives Glen R. · Officer Grant (A) 774K
Owned 774K Trade date Jul 1, 2026 Filed date Jul 2, 2026
Ives Glen R. Officer Grant (A) 774K 774K Jul 1, 2026 Jul 2, 2026
Martin Tammy L. · Officer Grant (A) $598
Price $0.45 Qty 1K Owned 14K Trade date Mar 31, 2026 Filed date Mar 31, 2026
Martin Tammy L. Officer Grant (A) $0.45 1K $598 14K Mar 31, 2026 Mar 31, 2026
Bell David T. · Officer, Other Grant (A) $598
Price $0.45 Qty 1K Owned 16K Trade date Mar 31, 2026 Filed date Mar 31, 2026
Bell David T. Officer, Other Grant (A) $0.45 1K $598 16K Mar 31, 2026 Mar 31, 2026
Merriman Andrew · Officer Grant (A) $598
Price $0.45 Qty 1K Owned 537K Trade date Mar 31, 2026 Filed date Mar 31, 2026
Merriman Andrew Officer Grant (A) $0.45 1K $598 537K Mar 31, 2026 Mar 31, 2026
Ives Glen R. · Officer, Other Buy +$1K
Price $0.62 Qty +2K Owned 200K Trade date Mar 27, 2026 Filed date Mar 27, 2026
Ives Glen R. Officer, Other Buy $0.62 +2K +$1K 200K Mar 27, 2026 Mar 27, 2026
Merriman Andrew · Officer Buy +$1K
Price $0.64 Qty +2K Owned 536K Trade date Mar 27, 2026 Filed date Mar 27, 2026
Merriman Andrew Officer Buy $0.64 +2K +$1K 536K Mar 27, 2026 Mar 27, 2026
Ives Glen R. · Officer Buy +$7K
Price $0.66 Qty +10K Owned 198K Trade date Mar 26, 2026 Filed date Mar 26, 2026
Ives Glen R. Officer Buy $0.66 +10K +$7K 198K Mar 26, 2026 Mar 26, 2026
McMillen Charles Thomas · Director Sell −$21K
Price $0.70 Qty −30K Owned 231K Trade date Mar 25, 2026 Filed date Mar 27, 2026
McMillen Charles Thomas Director Sell $0.70 −30K −$21K 231K Mar 25, 2026 Mar 27, 2026
McMillen Charles Thomas · Director Sell −$44K
Price $0.80 Qty −55K Owned 261K Trade date Mar 18, 2026 Filed date Mar 20, 2026
McMillen Charles Thomas Director Sell $0.80 −55K −$44K 261K Mar 18, 2026 Mar 20, 2026
Merriman Andrew · Officer Buy +$2K
Price $0.80 Qty +3K Owned 534K Trade date Mar 18, 2026 Filed date Mar 18, 2026
Merriman Andrew Officer Buy $0.80 +3K +$2K 534K Mar 18, 2026 Mar 18, 2026
Wright Jay O. · Director, Officer, Other Sell −$32K
Price $1.05 Qty −30K Owned 7.1M Trade date Dec 19, 2025 Filed date Dec 22, 2025
Wright Jay O. Director, Officer, Other Sell $1.05 −30K −$32K 7.1M Dec 19, 2025 Dec 22, 2025
15 of 50
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Castellum, Inc. (CTM) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Wright Jay O 10.8M
% of shares outstanding 24.9% Filing date Oct 24, 2022
Wright Jay O 10.8M 24.9% Oct 24, 2022
Fuller Mark C 9.4M
% of shares outstanding 21.7% Filing date Oct 24, 2022
Fuller Mark C 9.4M 21.7% Oct 24, 2022
Crom Cortana Fund LLC 4.1M
% of shares outstanding 9.9% Filing date Feb 23, 2023
Crom Cortana Fund LLC 4.1M 9.9% Feb 23, 2023
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Castellum, Inc. (CTM) ownership FAQ

Who owns CTM?

33 reporting institutions disclosed CTM position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.