Vault-13

CASTELLUM INC CTM

COM NEW · Common Stock · CUSIP 14838T204

35 institutional holders +8 vs Q1 2026
7,909,2117.9m shares reported held*
8.3% of all shares outstanding*
$5.7mreported value*
12 new 6 added 4 reduced 4 sold out net bought ≈ $125.4k (+174.2k 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: 94.8m as of 2026-08-05, 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 ≈ $0.72.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0204060Q4 22: 14Q1 23: 15Q2 23: 18Q3 23: 18Q4 23: 21Q1 24: 22Q2 24: 22Q3 24: 18Q4 24: 21Q1 25: 26Q2 25: 34Q3 25: 42Q4 25: 40Q1 26: 27Q2 26: 3535Q4 22Q4 23Q4 24Q4 25Q2 26
Numbers
QuarterHolders
Q4 202214
Q1 202315
Q2 202318
Q3 202318
Q4 202321
Q1 202422
Q2 202422
Q3 202418
Q4 202421
Q1 202526
Q2 202534
Q3 202542
Q4 202540
Q1 202627
Q2 202635

Buyers vs sellers

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

Bought or addedCut or sold out
40040Q3 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 25Q3 25: 30 bought or addedQ3 25: 9 cut or sold outQ4 25: 20 bought or addedQ4 25: 19 cut or sold outQ4 25Q1 26: 9 bought or addedQ1 26: 24 cut or sold outQ2 26: 18 bought or addedQ2 26: 8 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 202469
Q4 202487
Q1 20251611
Q2 2025218
Q3 2025309
Q4 20252019
Q1 2026924
Q2 2026188

Biggest buyers

Virtu Financial LLC New +168,401+168.4k
Meridian Wealth Management, LLC Added +77,400+77.4k
VANGUARD FIDUCIARY TRUST CO Added +74,393+74.4k
HUB Investment Partners, LLC New +57,414+57.4k
UBS Group AG Added +55,429+55.4k
ARQ WEALTH ADVISORS, LLC New +35,000+35.0k
Creative Planning Added +29,680+29.7k
TWO SIGMA SECURITIES, LLC Added +25,308+25.3k
XTX Topco Ltd New +21,910+21.9k
ACT Advisors, LLC. New +21,074+21.1k

Biggest sellers

GEODE CAPITAL MANAGEMENT, LLC Reduced -128,862-128.9k
SEI INVESTMENTS CO Sold out -121,574-121.6k
JANE STREET GROUP, LLC Reduced -107,703-107.7k
HRT FINANCIAL LP Sold out -33,836-33.8k
Ground Swell Capital, LLC Sold out -21,090-21.1k
NORTHERN TRUST CORP Reduced -10,482-10.5k
CITIGROUP INC Sold out -7,040-7.0k
Savvy Advisors, Inc. Reduced -1,500-1.5k

Insider purchases and sales since 1 Apr 2026

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
404Q4 24: 0 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 2 sellingQ1 25Q2 25: 0 buyingQ2 25: 2 sellingQ3 25: 0 buyingQ3 25: 1 sellingQ3 25Q4 25: 0 buyingQ4 25: 1 sellingQ1 26: 2 buyingQ1 26: 1 sellingQ1 26Q2 26: 0 buyingQ2 26: 0 sellingQ3 26: 4 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—0——
Q1 20250—2$1.4m—
Q2 20250—2$802.6k—
Q3 20250—1$1.4m—
Q4 20250—1$704.3k—
Q1 20262$11.5k1$65.0k—
Q2 20260—0——
Q3 20264$32.5k0——
DateInsiderTradeSharesPrice ValueTheir holding
2026-09-09 Merriman Andrew Chief Operating Officer Bought 50,000 $0.62 $31.0k50.0k shares +9%
2026-07-01 Ives Glen R President Bought 1,262 $0.61 $7701.3k shares +1%
2026-07-01 MARTIN TAMMY L General Counsel and Secretary Bought 1,202 $0.61 $7331.2k shares +9%
2026-07-01 Bell David T Chief Financial Officer Bought 1,202 $0.61 $7331.2k shares +8%
2026-07-01 Merriman Andrew Chief Operating Officer Bought 1,202 $0.61 $7331.2k shares +<1%

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 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 3,093,7683.1m $2.2m $2.2m 0.00% Added +12.5k +12,511
2 Meridian Wealth Management, LLC 0.02% of their portfolio LEXINGTON, KY 863,200863.2k $621.4k $621.4k 0.02% Added +77.4k +77,400
3 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 816,037816.0k $587.6k $587.6k 0.00% Reduced -128.9k -128,862
4 CAPTRUST FINANCIAL ADVISORS 0.00% of their portfolio RALEIGH, NC 626,100626.1k $450.7k $450.7k 0.00% Unchanged
5 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 492,717492.7k $354.8k $354.8k 0.00% Added +74.4k +74,393
6 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 303,900303.9k $218.8k $218.8k 0.00% Unchanged
7 BlackRock, Inc. 0.00% of their portfolio New York, NY 265,486265.5k $191.1k $191.1k 0.00% Unchanged
8 Savvy Advisors, Inc. 0.00% of their portfolio NEW YORK, NY 220,300220.3k $158.6k $158.6k 0.00% Reduced -1.5k -1,500
9 UBS Group AG 0.00% of their portfolio ZURICH, V8 208,958209.0k $150.4k $150.4k 0.00% Added +55.4k +55,429
10 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 171,420171.4k $123.4k $123.4k 0.00% Reduced -10.5k -10,482
11 Virtu Financial LLC 0.00% of their portfolio New York, NY 168,401168.4k $121.0k $121.0k 0.00% New
12 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 129,071129.1k $92.9k $92.9k 0.00% Reduced -107.7k -107,703
13 BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.00% of their portfolio HOUSTON, TX 94,79494.8k $68.2k $68.2k 0.00% Unchanged
14 HUB Investment Partners, LLC 0.00% of their portfolio AUSTIN, TX 57,41457.4k $41.3k $41.3k 0.00% New
15 Creative Planning 0.00% of their portfolio OVERLAND PARK, KS 50,00050.0k $36.0k $36.0k 0.00% Added +29.7k +29,680
16 Almanack Investment Partners, LLC. 0.00% of their portfolio WAYNE, PA 50,00050.0k $36.0k $36.0k 0.00% Unchanged
17 TWO SIGMA SECURITIES, LLC 0.00% of their portfolio NEW YORK, NY 40,53040.5k $29.2k $29.2k 0.00% Added +25.3k +25,308
18 ARQ WEALTH ADVISORS, LLC 0.00% of their portfolio SCOTTSDALE, AZ 35,00035.0k $22.8k $22.8k 0.00% New
19 Pathstone Holdings, LLC 0.00% of their portfolio ENGLEWOOD, NJ 31,17931.2k $22.4k $22.4k 0.00% Unchanged
20 Vanguard Global Advisers, LLC 0.00% of their portfolio MALVERN, PA 27,34427.3k $19.7k $19.7k 0.00% Unchanged
21 KESTRA PRIVATE WEALTH SERVICES, LLC 0.00% of their portfolio AUSTIN, TX 27,25027.2k $19.6k $19.6k 0.00% Unchanged
22 CAPITAL ADVISORS INC/OK 0.00% of their portfolio TULSA, OK 22,00022.0k $15.8k $15.8k 0.00% Unchanged
23 XTX Topco Ltd 0.00% of their portfolio LONDON, X0 21,91021.9k $15.8k $15.8k 0.00% New
24 ACT Advisors, LLC. 0.01% of their portfolio ASHEVILLE, NC 21,07421.1k $15.2k $15.2k 0.01% New
25 PKS Advisory Services, LLC 0.00% of their portfolio ALBANY, NY 18,93118.9k $13.6k $13.6k 0.00% New
26 Blue Trust, Inc. 0.00% of their portfolio BRENTWOOD, TN 14,72414.7k $10.6k $10.6k 0.00% Unchanged
27 Inscription Capital, LLC 0.00% of their portfolio HOUSTON, TX 12,50012.5k $9.0k $9.0k 0.00% Unchanged
28 Welch Group, LLC 0.00% of their portfolio BIRMINGHAM, AL 10,00010.0k $7.2k $7.2k 0.00% Unchanged
29 JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio DES PERES, MO 6,3666.4k $4.5k $4.5k 0.00% Unchanged
30 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 5,8725.9k $4.2k $4.2k 0.00% New
31 Cape Investment Advisory, Inc. 0.00% of their portfolio MCDONOUGH, GA 2,0002.0k $1.4k $1.4k 0.00% New
32 TD Waterhouse Canada Inc. 0.00% of their portfolio TORONTO, A6 500500 $361 $361 0.00% New
33 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 215215 $154 $154 0.00% New
34 HARBOUR INVESTMENTS, INC. 0.00% of their portfolio MADISON, WI 150150 $108 $108 0.00% New
35 Clearstead Advisors, LLC 0.00% of their portfolio CLEVELAND, OH 100100 $72 $72 0.00% New