Comparable stake leader
Buckhout Laurie M.
SEC ownership of Castellum, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001877939.
Disclosed value leader
Jay O Wright
Comparable rows
0/48
Latest evidence
09 Sep 2026
- Public ticker
- CTM on NYSE
- Parsed ownership sources
-
3/4/5 and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Buckhout Laurie M.
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
09 Sep 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001877939
- Issuer location
- Vienna, VA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Castellum, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Buckhout Laurie M.
Disclosed value leader
Jay O Wright
Comparable rows
0/48
Latest evidence
09 Sep 2026
3/4/5
13F
Highest disclosed value: $7,491,721
48 rows are not safely comparable across share classes.
Showing 1-8 of 48 holder rows.
Quick read
Jay O Wright has the largest disclosed position value at $7.49M.
0 of 48 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Jay O Wright's linked filing trail.
Disclosed position value
Top 5
Jay O Wright
$7.49M
Mark C. Fuller
$6.85M
VANGUARD CAPITAL MANAGEMENT LLC
$2.23M
Emil Kaunitz
$1.3M
Andrew Merriman
$712.6K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 48 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Buckhout Laurie M. |
3/4/5
10%+ Owner
|
—
class O/S missing
|
—
16,290 shares
|
— | 23 Feb 2024 |
| Jay O Wright |
3/4/5
General Counsel, Secretary, Director, EVP - Strategy
|
—
class O/S missing
|
$7,491,721
7,134,973 shares
|
-$703,082 | 19 Dec 2025 |
| Mark C. Fuller |
3/4/5
Former Officer and Affiliate
|
—
class O/S missing
|
$6,847,298
6,113,659 shares
|
— | 03 Sep 2025 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
—
class O/S missing
|
$2,227,513
3,093,768 shares
|
— | 30 Jun 2026 |
| Emil Kaunitz |
3/4/5
Director
|
—
class O/S missing
|
$1,298,906
1,999,856 shares
|
— | 20 Dec 2022 |
| Andrew Merriman |
3/4/5
Chief Operating Officer
|
—
mixed-class rows
|
$712,639
863,531 shares
mixed-class rows
|
+$35,388 | 09 Sep 2026 |
| Glen R. Ives |
3/4/5
President, Chief Executive Officer
|
—
mixed-class rows
|
$657,937
974,508 shares
mixed-class rows
|
+$8,653 | 01 Jul 2026 |
| Meridian Wealth Management, LLC |
13F
Company
|
—
class O/S missing
|
$621,418
863,200 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$722,798.
Buys
$45,512
Insiders: 4
Sells
$768,310
Insiders: 2
Net
-$722,798
Shares: -622,132
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 71,868
Shares: 694,000
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 54,868 | 0 | $33,951 | $0 | +$33,951 |
| 3-6 | 14,000 | 30,000 | $9,166 | $21,129 | -$11,963 |
| 6-9 | 3,000 | 55,000 | $2,395 | $44,099 | -$41,704 |
| 9-12 | 0 | 609,000 | $0 | $703,082 | -$703,082 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-13 of 13 reporting-owner rows connected to Castellum, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
13
Largest Forms 3/4/5 holder
Jay O Wright
Net 12M change
-$722,797
Latest report
09 Sep 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Jay O Wright | General Counsel, Secretary, Director, EVP - Strategy | $7,491,721 | -$703,082 | -8.6% | Filing P/S | 19 Dec 2025 |
| Mark C. Fuller | Former Officer and Affiliate | $6,847,298 | Filing P/S | 03 Sep 2025 | ||
| Emil Kaunitz | Director | $1,298,906 | Mixed | 20 Dec 2022 | ||
| Andrew Merriman | Chief Operating Officer | $712,639 | +$35,388 | +5.2% | Mixed | 09 Sep 2026 |
| Glen R. Ives | President, Chief Executive Officer | $657,937 | +$8,653 | +1.3% | Mixed | 01 Jul 2026 |
| Charles Thomas McMillen | Director | $162,703 | -$65,228 | -29% | Filing P/S | 25 Mar 2026 |
| Patricia Frost | Director | $40,867 | Mixed | 21 Mar 2023 | ||
| David T. Bell | Chief Financial Officer, Treasurer | $10,560 | +$736 | +7.5% | Filing P/S | 01 Jul 2026 |
| Tammy L. Martin | General Counsel and Secretary | $9,198 | +$736 | +8.7% | Filing P/S | 01 Jul 2026 |
| Mark S. Alarie | Director | Mixed | 11 Nov 2025 | |||
| Buckhout Laurie M. | 10%+ Owner | Mixed | 23 Feb 2024 | |||
| Bernard S. Champoux | Director | Mixed | 11 Nov 2025 | |||
| John F. Campbell | Director | Mixed | 11 Nov 2025 |
Recent insider transactions for Castellum, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Andrew Merriman | CTM | Common Stock | Purchase | 9.28% | $30,972 | $0.6194 | 50,000 | 588,531 | 09 Sep 2026 | Direct |
| Andrew Merriman | CTM | Common Stock | Purchase | 0.22% | $736 | $0.6120 | 1,202 | 538,531 | 01 Jul 2026 | Direct |
| David T. Bell | CTM | Common Stock | Purchase | 7.49% | $736 | $0.6120 | 1,202 | 17,255 | 01 Jul 2026 | Direct |
| Tammy L. Martin | CTM | Common Stock | Purchase | 8.69% | $736 | $0.6120 | 1,202 | 15,031 | 01 Jul 2026 | Direct |
| Glen R. Ives | CTM | Common Stock | Purchase | 0.63% | $772 | $0.6120 | 1,262 | 200,878 | 01 Jul 2026 | Direct |
| Glen R. Ives | CTM | Stock Options | Award | 773,630 | 773,630 | 01 Jul 2026 | Direct | |||
| Tammy L. Martin | CTM | Common Stock | Award | 10.6% | 1,329 | 13,829 | 31 Mar 2026 | Direct | ||
| David T. Bell | CTM | Common Stock | Award | 9.03% | 1,329 | 16,053 | 31 Mar 2026 | Direct | ||
| Andrew Merriman | CTM | Common Stock | Award | 0.25% | 1,329 | 537,329 | 31 Mar 2026 | Direct | ||
| Glen R. Ives | CTM | Common Stock | Purchase | 1.01% | $1,231 | $0.6157 | 2,000 | 199,616 | 27 Mar 2026 | Direct |
| Andrew Merriman | CTM | Common Stock | Purchase | 0.37% | $1,285 | $0.6426 | 2,000 | 536,000 | 27 Mar 2026 | Direct |
| Glen R. Ives | CTM | Common Stock | Purchase | 5.33% | $6,649 | $0.6649 | 10,000 | 197,616 | 26 Mar 2026 | Direct |
| C. Thomas McMillen | CTM | Common Stock | Sale | -11.5% | $21,129 | $0.7043 | -30,000 | 231,015 | 25 Mar 2026 | Direct |
| C. Thomas McMillen | CTM | Common Stock | Sale | -17.4% | $44,099 | $0.8018 | -55,000 | 261,015 | 18 Mar 2026 | Direct |
| Andrew Merriman | CTM | Common Stock | Purchase | 0.56% | $2,395 | $0.7983 | 3,000 | 534,000 | 18 Mar 2026 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -0.42% | $31,500 | $1.05 | -30,000 | 7,134,973 | 19 Dec 2025 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -0.17% | $12,876 | $1.07 | -12,000 | 7,164,973 | 16 Dec 2025 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -0.08% | $6,618 | $1.10 | -6,000 | 7,176,973 | 15 Dec 2025 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -0.15% | $12,749 | $1.16 | -11,000 | 7,182,973 | 12 Dec 2025 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -0.69% | $58,050 | $1.16 | -50,000 | 7,193,973 | 11 Dec 2025 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -1.72% | $153,289 | $1.21 | -127,000 | 7,243,973 | 10 Dec 2025 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -0.47% | $36,750 | $1.05 | -35,000 | 7,370,973 | 01 Dec 2025 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -0.24% | $18,990 | $1.06 | -18,000 | 7,405,973 | 28 Nov 2025 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -0.13% | $11,560 | $1.16 | -10,000 | 7,423,973 | 17 Nov 2025 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -1.2% | $103,500 | $1.15 | -90,000 | 7,433,973 | 14 Nov 2025 | Direct |
| Jay O Wright | CTM | Common Stock | Sale | -2.08% | $186,400 | $1.16 | -160,000 | 7,523,973 | 13 Nov 2025 | Direct |
| John F. Campbell | CTM | Stock Options | Award | 100,000 | 100,000 | 11 Nov 2025 | Direct | |||
| Glen R. Ives | CTM | Stock Options | Award | 500,000 | 500,000 | 11 Nov 2025 | Direct | |||
| David T. Bell | CTM | Stock Options | Award | 225,000 | 225,000 | 11 Nov 2025 | Direct | |||
| Andrew Merriman | CTM | Stock Options | Award | 275,000 | 275,000 | 11 Nov 2025 | Direct | |||
| Bernard S. Champoux | CTM | Stock Options | Award | 100,000 | 100,000 | 11 Nov 2025 | Direct | |||
| Mark S. Alarie | CTM | Stock Options | Award | 100,000 | 100,000 | 11 Nov 2025 | Direct | |||
| C. Thomas McMillen | CTM | Stock Options | Award | 100,000 | 100,000 | 11 Nov 2025 | Direct | |||
| Jay O Wright | CTM | Common Stock | Sale | -0.77% | $70,800 | $1.18 | -60,000 | 7,683,973 | 11 Nov 2025 | Direct |
* marks a reported price that did not pass the local price check.