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Equibles

JANE STREET GROUP, LLC

Position in ATI — Ati Inc

CIK 1595888 NEW YORK, NY
Back to ATI Full portfolio

Position in ATI

as of Mar 31, 2026 · filed May 12, 2026
Position Value
$216,919,115
+$185,107,873 QoQ
Shares Held
1,491,263
+438.0% QoQ
Ownership
1.09%
of shares outstanding
% of Portfolio
0.28%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Common Shares in ATI Over Time

Shares Held

Position Value (USD)

Derivatives in ATI

reported options exposure · as of Mar 31, 2026
CallValue
$10,254,930
CallShares
70,500
PutValue
$2,981,930
PutShares
20,500

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 Metal Fabrication

Industrials · as of Mar 31, 2026

JANE STREET GROUP, LLC holds $313,306,433 across 11 Metal Fabrication names. ATI ranks #1 (69.2% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 ATI
Ati Inc
This page 		1,491,263 $216,919,115
2 CRS
Carpenter Technology Corp
 161,131 $63,509,782
3 MLI
Mueller Industries Inc
 341,288 $18,907,354
4 WOR
Worthington Enterprises, Inc.
 91,599 $4,775,970
5 PRLB
Proto Labs Inc
 57,355 $3,270,381
6 IIIN
Insteel Industries Inc
 80,645 $2,710,477
7 AP
Ampco Pittsburgh Corp
 168,301 $1,130,981
8 RYZ
Ryerson Holding Corp
 36,312 $816,293

All Filings in ATI

Export CSV
49 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $216,919,115 1,491,263
2026-03-31 $10,254,930 70,500
2026-03-31 $2,981,930 20,500
2025-12-31 $31,811,242 277,198
2025-12-31 $11,498,952 100,200
2025-12-31 $4,223,168 36,800
2025-09-30 $3,700,970 45,500
2025-09-30 $7,321,168 90,007
2025-09-30 $6,002,892 73,800
2025-06-30 $22,673,486 262,607
2025-06-30 $8,426,784 97,600
2025-06-30 $3,030,534 35,100
2025-03-31 $515,097 9,900
2025-03-31 $1,784,629 34,300
2025-03-31 $30,405,862 584,391
2024-12-31 $960,667 17,454
2024-09-30 $1,512,166 22,600
2024-09-30 $1,398,419 20,900
2024-09-30 $39,593,857 591,748
2024-06-30 $62,477,510 1,126,736
2024-03-31 $5,436,145 106,237
2023-12-31 $3,636,507 79,976
2023-09-30 $3,807,239 92,521
2023-06-30 $4,467,184 100,999
2023-03-31 $384,143 9,735
2022-12-31 $1,266,750 42,423
2022-09-30 $1,240,504 46,618
2022-06-30 $4,200,691 184,971
2022-03-31 $3,129,544 116,600
2022-03-31 $3,183,518 118,611
2022-03-31 $2,531,012 94,300
2021-12-31 $2,232,811 140,164
2021-12-31 $1,495,827 93,900
2021-09-30 $452,336 27,200
2021-09-30 $1,131,504 68,040
2021-06-30 $917,400 44,000
2021-06-30 $229,350 11,000
2021-06-30 $5,583,066 267,773
2021-03-31 $598,104 28,400
2021-03-31 $240,084 11,400
2021-03-31 $1,648,955 78,298
2020-12-31 $1,797,039 107,158
2020-12-31 $2,488,668 148,400
2020-12-31 $191,178 11,400
2020-09-30 $99,408 11,400
2020-09-30 $794,199 91,078
2020-09-30 $277,296 31,800
2020-06-30 $149,680 14,689
2020-03-31 $121,354 14,277

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