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Who owns Castellum (CTM) stock

32 funds reported Castellum (CTM) shares in their latest 13F filings, worth $8.0M in all. The largest holder is Vanguard Group ($3.1M). Last quarter 16 funds added to their stakes and 8 cut them.

Largest holders of CTM (13F)Largest holders of CTM (13F)Vanguard Group$3.1MVanguard Capital Management LLC$2.2MGeode Capital Management, LLC$588KCaptrust Financial Advisors$451KVanguard Fiduciary Trust$355KState Street$219KBlackRock$191KUBS Group AG$150KNorthern Trust$123KVirtu Financial LLC$121K

Largest holders (13F)

FundSharesValueChangeQuarter
Vanguard Group3,473,227$3.1Mincrease2025-12-31
Vanguard Capital Management LLC3,093,768$2.2Mincrease2026-06-30
Geode Capital Management, LLC816,037$588Kdecrease2026-06-30
Captrust Financial Advisors626,100$451Kunchanged2026-06-30
Vanguard Fiduciary Trust492,717$355Kincrease2026-06-30
State Street303,900$219Kunchanged2026-06-30
BlackRock265,486$191Kunchanged2026-06-30
UBS Group AG208,958$150Kincrease2026-06-30
Northern Trust171,420$123Kdecrease2026-06-30
Virtu Financial LLC168,401$121Knew2026-06-30
Jane Street Group, LLC129,071$93Kdecrease2026-06-30
Bridgeway Capital Management, LLC94,794$68Kunchanged2026-06-30
HUB Investment Partners, LLC57,414$41Knew2026-06-30
Almanack Investment Partners, LLC.50,000$31Kunchanged2026-09-30
Two Sigma Securities, LLC40,530$29Kincrease2026-06-30

Castellum's latest quarter

Castellum, Q3 2026: revenue $14.7M (+0.6% year over year), operating margin -3.8%, net loss $454K, operating cash flow −$1.3M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most CTM stock?

By the latest 13F filings: Vanguard Group ($3.1M); Vanguard Capital Management LLC ($2.2M); Geode Capital Management, LLC ($588K); Captrust Financial Advisors ($451K); Vanguard Fiduciary Trust ($355K).

What is the short interest in CTM?

6,042,817 shares were sold short at the 2026-10-15 settlement, 11.43% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.