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LOOMIS SAYLES & CO L P

Position in AMTM — Amentum Holdings, Inc.

CIK 312348 BOSTON, MA

Position in AMTM

as of Mar 31, 2026 · filed May 14, 2026
Position Value
$28,201,242
-$4,247,728 QoQ
Shares Held
1,081,336
-3.4% QoQ
Ownership
0.443%
of shares outstanding
% of Portfolio
0.04%
of 13F equity value
Holder Rank
not a current holder
Holding Since
Mar 2025
5 quarters on record
Voting authority Sole 82% Shared 0% None 18%

Common Shares in AMTM Over Time

Shares Held

Position Value (USD)

Position in Specialty Business Services

Industrials · as of Mar 31, 2026

LOOMIS SAYLES & CO L P holds $51,617,558 across 4 Specialty Business Services names. AMTM ranks #1 (54.6% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 AMTM
Amentum Holdings, Inc.
This page
1,081,336 $28,201,242

All Filings in AMTM

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5 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $28,201,242 1,081,336
2025-12-31 $32,448,970 1,118,930
2025-09-30 $25,484,691 1,064,079
2025-06-30 $25,007,924 1,059,209
2025-03-31 $7,929,266 435,674