Vault-13

CASTELLUM INC CTM

COM NEW · Common Stock · CUSIP 14838T204

34 institutional holders +8 vs Q1 2025
6,951,5557.0m shares reported held*
7.5% of all shares outstanding*
$7.3mreported value*
13 new 8 added 2 reduced 6 sold out net bought ≈ $4.0m (+3.6m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 93.0m as of 2025-08-07, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $1.05.

Trends to Q2 2025

Institutional holders

Managers reporting a position, each quarter

02040Q4 22: 14Q1 23: 15Q2 23: 18Q3 23: 18Q4 23: 21Q1 24: 22Q2 24: 22Q3 24: 18Q4 24: 21Q1 25: 26Q2 25: 3434Q4 22Q2 23Q4 23Q2 24Q4 24Q2 25
Numbers
QuarterHolders
Q4 202214
Q1 202315
Q2 202318
Q3 202318
Q4 202321
Q1 202422
Q2 202422
Q3 202418
Q4 202421
Q1 202526
Q2 202534

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
40040Q3 23: 8 bought or addedQ3 23: 7 cut or sold outQ4 23: 10 bought or addedQ4 23: 4 cut or sold outQ4 23Q1 24: 10 bought or addedQ1 24: 5 cut or sold outQ2 24: 10 bought or addedQ2 24: 9 cut or sold outQ2 24Q3 24: 6 bought or addedQ3 24: 9 cut or sold outQ4 24: 8 bought or addedQ4 24: 7 cut or sold outQ4 24Q1 25: 16 bought or addedQ1 25: 11 cut or sold outQ2 25: 21 bought or addedQ2 25: 8 cut or sold outQ2 25
Numbers
QuarterBought or addedCut or sold out
Q3 202387
Q4 2023104
Q1 2024105
Q2 2024109
Q3 202469
Q4 202487
Q1 20251611
Q2 2025218

Biggest buyers

ESSEX INVESTMENT MANAGEMENT CO LLC New +2,090,500+2.1m
Legato Capital Management LLC New +621,409+621.4k
VANGUARD GROUP INC Added +412,350+412.4k
JANE STREET GROUP, LLC New +194,733+194.7k
Savvy Advisors, Inc. New +191,100+191.1k
GEODE CAPITAL MANAGEMENT, LLC Added +180,673+180.7k
Virtu Financial LLC Added +85,997+86.0k
XTX Topco Ltd Added +70,377+70.4k
HRT FINANCIAL LP New +50,395+50.4k
Meridian Wealth Management, LLC Added +36,000+36.0k

Biggest sellers

Inscription Capital, LLC Reduced -237,500-237.5k
Bank of New York Mellon Corp Reduced -100,001-100.0k
TOWNSQUARE CAPITAL LLC Sold out -44,750-44.8k
Tower Research Capital LLC (TRC) Sold out -38,961-39.0k
MML INVESTORS SERVICES, LLC Sold out -27,937-27.9k
TWO SIGMA SECURITIES, LLC Sold out -17,230-17.2k
Westside Investment Management, Inc. Sold out -680-680
American Capital Advisory, LLC Sold out -342-342

Insider purchases and sales in Q2 2025

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
202Q3 23: 0 buyingQ3 23: 0 sellingQ4 23: 0 buyingQ4 23: 0 sellingQ4 23Q1 24: 0 buyingQ1 24: 0 sellingQ2 24: 1 buyingQ2 24: 0 sellingQ2 24Q3 24: 1 buyingQ3 24: 0 sellingQ4 24: 0 buyingQ4 24: 0 sellingQ4 24Q1 25: 0 buyingQ1 25: 2 sellingQ2 25: 0 buyingQ2 25: 2 sellingQ2 25
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q3 20230—0——
Q4 20230—0——
Q1 20240—0——
Q2 20241$22.4k0——
Q3 20241$92.8k0——
Q4 20240—0——
Q1 20250—2$1.4m—
Q2 20250—2$802.6k—
DateInsiderTradeSharesPrice ValueTheir holding
2025-05-19 Fuller Mark C Director Sold 500,000 $1.05 $525.0k500.0k shares -7%
2025-05-19 WRIGHT JAY O General Counsel, Secretary, director Sold 259,400 $1.07 $277.6k259.4k shares -3%

Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).

Holders, Q2 2025

#ManagerLocationShares Value% of their portfolioChangeShares change
1 ESSEX INVESTMENT MANAGEMENT CO LLC 0.40% of their portfolio BOSTON, MA 2,090,5002.1m $2.2m $2.2m 0.40% New
2 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 1,051,9781.1m $1.1m $1.1m 0.00% Added +412.4k +412,350
3 Legato Capital Management LLC 0.08% of their portfolio San Francisco, CA 621,409621.4k $652.5k $652.5k 0.08% New
4 Meridian Wealth Management, LLC 0.03% of their portfolio LEXINGTON, KY 616,800616.8k $647.6k $647.6k 0.03% Added +36.0k +36,000
5 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 599,198599.2k $629.3k $629.3k 0.00% Added +180.7k +180,673
6 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 500,001500.0k $525.0k $525.0k 0.00% Reduced -100.0k -100,001
7 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 194,733194.7k $204.5k $204.5k 0.00% New
8 Savvy Advisors, Inc. 0.01% of their portfolio NEW YORK, NY 191,100191.1k $200.7k $200.7k 0.01% New
9 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 156,000156.0k $163.8k $163.8k 0.00% Unchanged
10 XTX Topco Ltd 0.01% of their portfolio LONDON, X0 135,796135.8k $142.6k $142.6k 0.01% Added +70.4k +70,377
11 BlackRock, Inc. 0.00% of their portfolio New York, NY 127,421127.4k $133.8k $133.8k 0.00% Unchanged
12 Virtu Financial LLC 0.01% of their portfolio New York, NY 105,126105.1k $110.0k $110.0k 0.01% Added +86.0k +85,997
13 Cubist Systematic Strategies, LLC 0.00% of their portfolio STAMFORD, CT 94,15294.2k $98.9k $98.9k 0.00% Added +26.5k +26,472
14 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 94,12094.1k $98.8k $98.8k 0.00% Unchanged
15 HRT FINANCIAL LP 0.00% of their portfolio NEW YORK, NY 50,39550.4k $52.0k $52.0k 0.00% New
16 Almanack Investment Partners, LLC. 0.01% of their portfolio WAYNE, PA 50,00050.0k $52.5k $52.5k 0.01% Unchanged
17 PKS Advisory Services, LLC 0.01% of their portfolio ALBANY, NY 42,22242.2k $44.3k $44.3k 0.01% Unchanged
18 TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio NEW YORK, NY 32,99633.0k $34.6k $34.6k 0.00% New
19 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 31,62831.6k $33.2k $33.2k 0.00% New
20 KESTRA PRIVATE WEALTH SERVICES, LLC 0.00% of their portfolio AUSTIN, TX 27,25027.2k $28.6k $28.6k 0.00% Unchanged
21 Squarepoint Ops LLC 0.00% of their portfolio NEW YORK, NY 23,94023.9k $25.1k $25.1k 0.00% New
22 Quadrature Capital Ltd 0.00% of their portfolio LONDON, X0 21,08921.1k $22.2k $22.2k 0.00% New
23 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 17,71017.7k $18.6k $18.6k 0.00% Added +19 +19
24 Pathstone Holdings, LLC 0.00% of their portfolio ENGLEWOOD, NJ 15,59015.6k $16.4k $16.4k 0.00% New
25 Blue Trust, Inc. 0.00% of their portfolio BRENTWOOD, TN 14,72414.7k $15.5k $15.5k 0.00% Unchanged
26 Inscription Capital, LLC 0.00% of their portfolio HOUSTON, TX 12,50012.5k $13.1k $13.1k 0.00% Reduced -237.5k -237,500
27 New Century Financial Group, LLC 0.01% of their portfolio PRINCETON, NJ 12,00012.0k $12.6k $12.6k 0.01% New
28 Creative Planning 0.00% of their portfolio OVERLAND PARK, KS 10,00010.0k $10.5k $10.5k 0.00% Unchanged
29 Global Retirement Partners, LLC 0.00% of their portfolio San Rafael, CA 4,8124.8k $5.1k $5.1k 0.00% First filing
30 Sunbelt Securities, Inc. 0.00% of their portfolio HOUSTON, TX 3,0003.0k $6.0k $6.0k 0.00% New
31 Strengthening Families & Communities, LLC 0.00% of their portfolio BOSTON, MA 2,7002.7k $2.9k $2.9k 0.00% New
32 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 589589 $619 $619 0.00% Added +224 +224
33 UBS Group AG 0.00% of their portfolio ZURICH, V8 7676 $80 $80 0.00% Unchanged
34 CONCOURSE FINANCIAL GROUP SECURITIES, INC. — of their portfolio BIRMINGHAM, AL 00 $0 $0 — Unchanged