Security key
14838T204
- Security type / class
- Equity / COM NEW
- Total 13F shares
- 8,505,651
- Total 13F value
- $9,270,435
- Share change
- +1,557,096
- SEC-reported price per share
- $1.09
- Number of holders
- 42
- Value change
- +$1,704,969
- Number of buys
- 30
- Number of sells
- 8
Report period
Q3 2025
Institutions
42
Top holders
10
CTM full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q4 2025
Castellum, Inc. SEC filings
Castellum, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 14838T204
Recent filing periods:
Ownership snapshot
Top reported holders of CTM - Castellum, Inc. - COM NEW (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
Mark C. Fuller
Comparable rows
0/15
Latest evidence
03 Sep 2025
3/4/5
13F
Highest disclosed value: $6,847,298
15 rows are not safely comparable across share classes.
Showing 1-6 of 15 holder rows.
Quick read
Mark C. Fuller has the largest disclosed position value at $6.85M.
0 of 15 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 Mark C. Fuller's linked filing trail.
Disclosed position value
Top 5
Mark C. Fuller
$6.85M
ESSEX INVESTMENT MANAGEMENT CO LLC
$2.2M
Emil Kaunitz
$1.3M
VANGUARD GROUP INC
$1.1M
Legato Capital Management LLC
$652.5K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-6 of 15 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 |
| Mark C. Fuller |
3/4/5
Former Officer and Affiliate
|
—
class O/S missing
|
$6,847,298
6,113,659 shares
|
-$560,000 | 03 Sep 2025 |
| ESSEX INVESTMENT MANAGEMENT CO LLC |
13F
Company
|
—
class O/S missing
|
$2,195,025
2,090,500 shares
|
— | 30 Jun 2025 |
| Emil Kaunitz |
3/4/5
Director
|
—
class O/S missing
|
$1,298,906
1,999,856 shares
|
— | 20 Dec 2022 |
| VANGUARD GROUP INC |
13F
Company
|
—
class O/S missing
|
$1,104,577
1,051,978 shares
|
— | 30 Jun 2025 |
| Legato Capital Management LLC |
13F
Company
|
—
class O/S missing
|
$652,479
621,409 shares
|
— | 30 Jun 2025 |
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.
13F holder rows
Institutional holders as of Q3 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
42
Shares
8,505,651
Rows available
42
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q3 2025 vs Q1 2026 Across Filers
Q1 2026 holders
27
Q3 2025 holders
42
Holder diff
15
| Investor | Q1 2026 Shares | Q3 2025 Shares | Share Diff | Share Chg % | Q1 2026 value | Q3 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend