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JANE STREET GROUP, LLC

Position in AMTM — Amentum Holdings, Inc.

CIK 1595888 NEW YORK, NY

Position in AMTM

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$7,104,009
+$2,097,198 QoQ
Shares Held
343,687
+79.0% QoQ
Ownership
0.141%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#62
of 462 holders
Holding Since
Sep 2024
8 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in AMTM Over Time

Shares Held

Position Value (USD)

Derivatives in AMTM

reported options exposure · as of Jun 30, 2026
CallValue
$2,846,259
CallShares
137,700
PutValue
$797,862
PutShares
38,600

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Specialty Business Services

Industrials · as of Jun 30, 2026

JANE STREET GROUP, LLC holds $270,543,163 across 19 Specialty Business Services names. AMTM ranks #6 (2.6% of the industry book) .

# Ticker Company Shares Value (USD) Open
6 AMTM
Amentum Holdings, Inc.
This page
343,687 $7,104,009

All Filings in AMTM

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21 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $797,862 38,600
2026-06-30 $7,104,009 343,687
2026-06-30 $2,846,259 137,700
2026-03-31 $2,362,848 90,600
2026-03-31 $5,006,811 191,979
2026-03-31 $3,632,944 139,300
2025-12-31 $1,041,100 35,900
2025-12-31 $2,180,800 75,200
2025-12-31 $313,461 10,809
2025-09-30 $2,258,964 94,320
2025-09-30 $637,070 26,600
2025-09-30 $7,215,200 301,261
2025-06-30 $2,265,237 95,944
2025-06-30 $2,247,955 95,212
2025-03-31 $4,342,520 238,600
2025-03-31 $10,952,031 601,760
2025-03-31 $6,142,500 337,500
2024-12-31 $2,969,436 141,200
2024-12-31 $3,459,435 164,500
2024-12-31 $578,113 27,490
2024-09-30 $1,842,990 57,147