Castellum, Inc.
CTM- Exchange
- NYSE
- Industry
- Services-Management Consulting Services
- SEC CIK
- 0001877939
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.
Holders of 5% or more of CTM
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Castellum, Inc., largest stake first. The change is against the holder's previous filing.
No holder currently reports owning 5% or more of Castellum, Inc. on Schedule 13D or 13G.
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
3 Schedule 13D and 13G filings on Castellum, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Feb 23, 2023 | Crom Cortana Fund LLC | 13GOld format | – | New | – | SEC |
| Oct 24, 2022 | Fuller Mark C | 13DOld format | – | New | – | SEC |
| Oct 24, 2022 | Wright Jay O | 13DOld format | – | New | – | SEC |
Form 144: proposed insider sales
7 notices from officers, directors and other affiliates planning to sell Castellum, Inc. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Mar 17, 20264:35 PM ET | McMillen Charles ThomasDirector | 110.0K | $82.54 | Mar 17, 2026 | First Georgetown Securities, Inc | SEC |
| Nov 10, 20254:03 PM ET | Wright Jay ODirector · 10% stockholder | 800.0K | $1.02M | Nov 11, 2025 | First Georgetown Securities Inc | SEC |
| Aug 18, 20259:35 AM ET | Wright Jay OOfficer · Director · 10% stockholder | 500.0K | $640.0K | Aug 18, 2025 | First Georgetown Securities Inc | SEC |
| Aug 18, 20258:59 AM ET | Fuller Mark C10% stockholder | 500.0K | $640.0K | Aug 18, 2025 | First Georgetown Securities Inc | SEC |
| May 19, 20251:25 PM ET | Fuller Mark COfficer | 500.0K | $560.0K | May 19, 2025 | First Georgetown Securites Inc | SEC |
| Mar 4, 20259:21 AM ET | Wright Jay OOfficer · Director · 10% stockholder | 500.0K | $490.5K | Mar 5, 2025 | First Georgetown Securities, Inc | SEC |
| Mar 4, 20259:18 AM ET | Fuller Mark CDirector · 10% stockholder | 500.0K | $490.5K | Mar 5, 2025 | First Georgetown Securities, Inc | SEC |