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GROUP ONE TRADING LLC

Position in AMTM — Amentum Holdings, Inc.

CIK 932540 CHICAGO, IL

Position in AMTM

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$572,765
-$253,677 QoQ
Shares Held
27,710
-2.8% QoQ
Ownership
0.011%
of shares outstanding
% of Portfolio
0.02%
of 13F equity value
Holder Rank
#190
of 458 holders
Holding Since
Sep 2024
7 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in AMTM Over Time

Shares Held

Position Value (USD)

Position in Specialty Business Services

Industrials · as of Jun 30, 2026

GROUP ONE TRADING LLC holds $8,911,582 across 10 Specialty Business Services names. AMTM ranks #4 (6.4% of the industry book) .

# Ticker Company Shares Value (USD) Open
4 AMTM
Amentum Holdings, Inc.
This page
27,710 $572,765

All Filings in AMTM

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7 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $572,765 27,710
2025-12-31 $826,442 28,498
2025-09-30 $493,537 20,607
2025-06-30 $1,603,307 67,908
2025-03-31 $1,905,248 104,684
2024-12-31 $1,809,337 86,036
2024-09-30 $33,798 1,048