Castellum, Inc. (CTM) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

89,765,186Shares Outstanding

10,551,205Shares held by institutions

$7,219,134Value of institutional holdings

11.75%Institutional ownership %

97.40%Shares Changed QoQ

38No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Castellum, Inc. (NYSE:CTM) showed up in the 13F filings of 38 institutional investors as of December 2025.

Their combined ownership stood at 11.4% of outstanding shares in December 2025, up from 6.2% in September 2025.
Their total shares held in CTM increased 90.79% quarter over quarter, and separately, investors owning Castellum increased 80.95% from a year ago.
Activity in CTM broke down as 18 buyers, 11 sellers, and 9 unchanged among 38 total holders.
In total, institutional investors held 10.2Mn shares in Castellum as of December 2025, up by 4.85Mn shares quarter on quarter, and up 5.41Mn shares year over year.
As of December 31, 2025, VANGUARD GROUP INC held the largest stake in Castellum with 3.47Mn shares, accounting for 3.87% of total shares outstanding.
The biggest buyers of Castellum for the quarter ending December 2025 included VANGUARD GROUP INC (2.2Mn), UBS Group AG (2.13Mn), Goldman Sachs Group Inc (338.42K), Sei Investments Co (333.07K), Quadrature Capital Ltd (161.75K).
The largest sales of CTM for the quarter ending December 2025 came from Bank of New York Mellon Corp (250.0K), Centiva Capital, LP (102.82K), PKS Advisory Services, LLC (23.29K), Tower Research Capital LLC (TRC) (6.06K), Savvy Advisors, Inc. (5.2K).
Per Business Quant, the top 10 investors in CTM for the quarter ending December 2025 include VANGUARD GROUP INC (3.47Mn), UBS Group AG (2.16Mn), GEODE CAPITAL MANAGEMENT, LLC (773.72K), Meridian Wealth Management, LLC (745.15K), Goldman Sachs Group Inc (707.05K), JANE STREET GROUP, LLC (343.84K), Sei Investments Co (333.07K), State Street Corp (303.9K), BlackRock, Inc. (265.49K), Savvy Advisors, Inc. (221.8K).

38 Institutional Holders

10,551,205 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
VANGUARD GROUP INC	31 Dec, 2025	3,473,227	2,195,312	171.79%	$3,136,325.00
UBS Group AG	31 Dec, 2025	2,155,157	2,133,376	9,794.67%	$1,946,107.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	773,724	50,197	6.94%	$699,020.00
Meridian Wealth Management, LLC	31 Dec, 2025	745,150	60,550	8.84%	$673,019.00
Goldman Sachs Group Inc	31 Dec, 2025	707,052	338,420	91.80%	$638,610.00
JANE STREET GROUP, LLC	31 Dec, 2025	343,842	8,138	2.42%	$310,558.00
Sei Investments Co	31 Dec, 2025	333,071	333,071	0.00%	$300,830.00
State Street Corp	31 Dec, 2025	303,900	0	0.00%	$274,482.00
BlackRock, Inc.	31 Dec, 2025	265,486	0	0.00%	$239,787.00
Savvy Advisors, Inc.	31 Dec, 2025	221,800	-5,200	-2.29%	$200,330.00
Quadrature Capital Ltd	31 Dec, 2025	217,471	161,752	290.30%	$196,420.00
Northern Trust Corp	31 Dec, 2025	210,611	70,128	49.92%	$190,224.00
SUSQUEHANNA INTERNATIONAL GROUP, LLP	31 Dec, 2025	102,556	84,865	479.71%	$92,629.00
Bank of New York Mellon Corp	31 Dec, 2025	100,002	-250,000	-71.43%	$90,322.00
BRIDGEWAY CAPITAL MANAGEMENT, LLC	31 Dec, 2025	94,794	0	0.00%	$85,618.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	75,384	-2,181	-2.81%	$68,087.00
Almanack Investment Partners, LLC.	31 Dec, 2025	50,000	0	0.00%	$45,160.00
Inspire Advisors, LLC	31 Dec, 2025	41,700	41,700	0.00%	$37,664.00
Point72 Asset Management, L.P.	31 Dec, 2025	34,668	34,668	0.00%	$31,312.00
Pathstone Holdings, LLC	31 Dec, 2025	31,179	0	0.00%	$28,161.00

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