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ATI in the 13F filings

Allegheny Technologies Inc · CUSIP 01741R102

Sector · Materials
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 5 Feb 2026
Managers listing it
36
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 13 listed it in both
Shares listed
30,194,456
combined, among listed positions
Reported value
$3.5bn
combined, at the quarter end

Among the 92 comparable managers: 21 buyers (opened or added shares) and 22 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -1,956,557.

Managers listing ATI in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

36 of 36 holders

ActionFiling
Capital World Investors7,355,793$844m0.11%Trimmed-544,77911 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)5,074,824$582munder 0.1%Added+175,65417 Feb 2026 (the filing on sec.gov)
Capital Research Global Investors3,611,724$414m0.08%Added+386,75411 Feb 2026 (the filing on sec.gov)
Invesco Ltd3,384,924$388munder 0.1%Added+233,01019 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.2,022,621$232m0.13%Trimmed-1,004,48117 Feb 2026 (the filing on sec.gov)
Holocene Advisors LP1,071,745$123m0.26%Trimmed-462,36917 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC1,019,840$117m0.06%Added+889,91217 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC822,714$94m0.07%Trimmed-125,69827 Oct 2026 (the filing on sec.gov)
Point72 Asset Management LP760,177$87m0.10%Added+450,98317 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP628,285$72m0.07%Added+114,34613 Feb 2026 (the filing on sec.gov)
Millennium Management LLC506,881$58munder 0.1%Added+169,29017 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc498,177$57munder 0.1%Trimmed-575,97217 Feb 2026 (the filing on sec.gov)
Woodline Partners LP471,195$54m0.21%Trimmed-275,93217 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC389,986$45m0.06%Newnew17 Feb 2026 (the filing on sec.gov)
GAMCO Investors Inc383,100$44m0.42%Trimmed-12,7005 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP377,358$43munder 0.1%Trimmed-79,94217 Feb 2026 (the filing on sec.gov)
Arrowstreet Capital LP363,271$42munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP306,517$35munder 0.1%Added+34,74917 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC277,198$32munder 0.1%Added+187,19112 Feb 2026 (the filing on sec.gov)
Voloridge Investment Management LLC175,732$20m0.07%Trimmed-404,73517 Feb 2026 (the filing on sec.gov)
Man Group PLC131,661$15munder 0.1%Added+103,14017 Feb 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC107,131$12m0.05%Newnew17 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC102,702$12munder 0.1%Trimmed-10,20117 Feb 2026 (the filing on sec.gov)
Walleye Capital LLC102,298$12munder 0.1%Added+101,76113 Feb 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP91,896$11munder 0.1%Trimmed-62,88813 Feb 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (6)

Exited (7)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
23 in Q3 2024 to 33 in Q2 2026

Tracked managers listing it, at least.

0102030402014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
ATI by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20132$96mn.a.n.a.
Q3 20131$98mn.a.n.a.
Q4 20132$239mn.a.n.a.
Q1 20144$272mn.a.n.a.
Q2 20142$272mn.a.n.a.
Q3 20143$31mn.a.n.a.
Q4 20143$38mn.a.n.a.
Q1 20151$223kn.a.n.a.
Q3 20152$821kn.a.n.a.
Q4 20152$28mn.a.n.a.
Q1 20163$34mn.a.n.a.
Q3 20161$934kn.a.n.a.
Q4 20163$23mn.a.n.a.
Q1 20175$56mn.a.n.a.
Q2 20177$103mn.a.n.a.
Q3 20179$188mn.a.n.a.
Q4 20179$212mn.a.n.a.
Q1 20189$249mn.a.n.a.
Q2 201810$319mn.a.n.a.
Q3 20189$340mn.a.n.a.
Q4 20187$311mn.a.n.a.
Q1 20198$403mn.a.n.a.
Q2 201910$426mn.a.n.a.
Q3 201911$339mn.a.n.a.
Q4 20199$350mn.a.n.a.
Q1 20208$82mn.a.n.a.
Q2 20208$92mn.a.n.a.
Q3 20207$85mn.a.n.a.
Q4 20207$167mn.a.n.a.
Q1 20217$218mn.a.n.a.
Q2 20216$171mn.a.n.a.
Q3 20218$143mn.a.n.a.
Q4 20217$113mn.a.n.a.
Q1 20228$266mn.a.n.a.
Q2 20228$399mn.a.n.a.
Q3 202212$433mn.a.n.a.
Q4 202211$451mn.a.n.a.
Q1 202310$436mn.a.n.a.
Q2 202312$504mn.a.n.a.
Q3 202311$409mn.a.n.a.
Q4 202312$567m75
Q1 202411$598m75
Q2 202419$903m154
Q3 202423$1.8bn1410
Q4 202416$735m108
Q1 202521$852m174
Q2 202519$2.0bn614
Q3 202518$1.7bn118
Q4 202519$3.1bn2122
Q1 202627$5.4bn2715
Q2 202633$6.4bn2221

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

ATI and LIN →ATI and GLW →ATI and HWM →Choose a stock to compare with ATI →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own ATI, latest filings →Back to the 13F Explorer →