Tidemark’s Amentum Holdings AMTM Stock Holding History

Tidemark’s Portfolio AMTM Stock Details AMTM Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q3	$109	Buy	+6	New	+$126	﹤0.01%	1065

Other funds holding AMTM

Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return

Thompson Siegel & Walmsley Richmond, Virginia $5.37B AUM 3.99% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return

Cacti Asset Management Atlanta, Georgia $1.89B AUM 58.55% 1-Year Est. Return

Bank of New York Mellon New York $608B AUM 32.77% 1-Year Est. Return

Segra Capital Management Palm Beach, Florida $822M AUM 57.18% 1-Year Est. Return

Principal Financial Group Des Moines, Iowa $195B AUM 21.17% 1-Year Est. Return

Royce & Associates New York $11B AUM 39.4% 1-Year Est. Return

Fifth Third Bancorp Cincinnati, Ohio $61.2B AUM 25.19% 1-Year Est. Return

Mawer Investment Management Calgary, Alberta, Canada $13.6B AUM 13.16% 1-Year Est. Return

Tidemark's AMTM Position: Q3 2026 in Review

Tidemark opened a new position in Amentum Holdings (AMTM) in Q3 2026: 6 shares worth $109. The stake represents ﹤0.01% of the portfolio and ranks #1065 among its holdings.

214 funds tracked by Wall St. Rank hold AMTM as of Q3 2026.

Tidemark held 6 shares of Amentum Holdings worth $109 as of Q3 2026.
Amentum Holdings was a new Tidemark position in Q3 2026.
Amentum Holdings made up ﹤0.01% of Tidemark's portfolio in Q3 2026, its #1065 holding.
214 funds tracked by Wall St. Rank held Amentum Holdings as of Q3 2026.

Based on Tidemark's 13F filing for Q3 2026, filed 9 Nov 2026.