SEC 13F Intelligence

Thompson Siegel & Walmsley LLC / AMTM

Thompson Siegel & Walmsley LLC’s Amentum Holdings Inc Position

Does Thompson Siegel & Walmsley LLC own Amentum Holdings Inc (AMTM)? Yes — 1.53M shares worth $40M (+0.70% of its 13F portfolio) as of Q1 2026, down from 1.92M shares the prior filed quarter.

Position Value
$40M
Q1 2026
Shares
1.53M
% of Portfolio
+0.70%
Quarters Held
7
currently held

Position History AMTM

Reported value by quarter
Q3 ’24: $11MQ3 ’24Q4 ’24: $41MQ4 ’24Q1 ’25: $61MQ1 ’25Q2 ’25: $66MQ2 ’25Q3 ’25: $65MQ3 ’25Q4 ’25: $56MQ4 ’25Q1 ’26: $40MQ1 ’26filingsflow.com
QuarterSharesValue% of Portfolio
Q1 20261.53M$40M+0.70%
Q4 20251.92M$56M+0.93%
Q3 20252.73M$65M+1.06%
Q2 20252.79M$66M+1.09%
Q1 20253.33M$61M+1.02%
Q4 20241.95M$41M+0.64%
Q3 2024342.2K$11M+0.16%

Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See Thompson Siegel & Walmsley LLC’s full portfolio or all institutional holders of AMTM.