13F

Stock

Castellum, Inc.

CTM · held by 27 managers

Reported value

$4.54M

Holders

27

+5 new · −19 exited

Holders’ est. mark

−$1.03M

Price effect on 19 books still in the name

Largest holder

$1.82M

VANGUARD CAPITAL MANAGEMENT LLC

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
VANGUARD CAPITAL MANAGEMENT LLC3.08M$1.82MHeld
GEODE CAPITAL MANAGEMENT, LLC944.9K$557.1K−$242.8KCut−$141.9K
Meridian Wealth Management, LLC785.8K$463.2K−$233.8KCut−$209.8K
CAPTRUST FINANCIAL ADVISORS626.1K$369.1KNew
VANGUARD FIDUCIARY TRUST CO418.3K$246.8KHeld
State Street303.9K$179.1K−$95.3KCut−$95.3K
BlackRock, Inc.265.5K$156.5K−$83.3KCut−$83.3K
JANE STREET GROUP, LLC236.8K$139.6K−$74.3KCut−$171K
Savvy Advisors, Inc.221.8K$130.8K−$69.6KCut−$69.6K
NORTHERN TRUST CORP181.9K$107.2K−$57.1KCut−$83K
UBS Group AG153.5K$90.6K−$48.1KCut−$1.86M
SEI INVESTMENTS CO121.6K$71.7K−$38.1KCut−$229.2K
BRIDGEWAY CAPITAL MANAGEMENT, LLC94.8K$55.9K−$29.7KCut−$29.7K
Almanack Investment Partners, LLC.50K$29.5K−$15.7KCut−$15.7K
Pathstone Holdings, LLC31.2K$18.4K−$9.78KCut−$9.78K
Vanguard Global Advisers, LLC27.3K$16.1KHeld
KESTRA PRIVATE WEALTH SERVICES, LLC27.3K$16.1K−$8.55KCut−$8.55K
CAPITAL ADVISORS INC/OK22K$13KNew
Ground Swell Capital, LLC21.1K$12.4KNew
Creative Planning20.3K$12K−$6.27KCut−$6.08K
TWO SIGMA SECURITIES, LLC15.2K$8.97KNew
Blue Trust, Inc.14.7K$8.68K−$4.62KCut−$4.62K
Inscription Capital, LLC12.5K$7.37K−$3.92KCut−$3.92K
Welch Group, LLC10K$5.89K−$3.14KCut−$3.14K
CITIGROUP INC7.04K$4.15K−$2.21KCut−$20.1K
JONES FINANCIAL COMPANIES LLLP6.37K$3.95K−$1.75KCut−$1.62K
HRT FINANCIAL LP33.8K$19New

Who left

Positions as of Q1 2026. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.