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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 Mar 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 7 May 2025
Managers listing it
21
at least, of 95 tracked, among listed positions
Comparable managers
95
filed both Q4 2024 and Q1 2025; 15 listed it in both
Shares listed
16,375,601
combined, among listed positions
Reported value
$852m
combined, at the quarter end

Among the 95 comparable managers: 17 buyers (opened or added shares) and 4 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.

Managers listing ATI in Q1 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2024, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

21 of 21 holders

ActionFiling
Capital World Investors6,982,174$363m0.06%Added+106,59812 May 2025 (the filing on sec.gov)
D. E. Shaw & Co.1,639,294$85m0.08%Added+175,68115 May 2025 (the filing on sec.gov)
Neuberger Berman Group LLC1,132,296$59munder 0.1%Added+296,63427 Oct 2026 (the filing on sec.gov)
Point72 Asset Management LP1,028,660$54m0.12%Added+230,84621 Jul 2025 (the filing on sec.gov)
Woodline Partners LP944,216$49m0.32%Trimmed-47,52515 May 2025 (the filing on sec.gov)
Soros Fund Management LLC613,884$32m0.48%Added+222,38315 May 2025 (the filing on sec.gov)
Marshall Wace LLP608,584$32munder 0.1%Trimmed-90,48715 May 2025 (the filing on sec.gov)
Capital Research Global Investors602,959$31munder 0.1%Newnew12 May 2025 (the filing on sec.gov)
Freestone Grove Partners LP543,915$28m0.29%Newnew15 May 2025 (the filing on sec.gov)
GAMCO Investors Inc401,700$21m0.23%Trimmed-4,00014 May 2025 (the filing on sec.gov)
Bridgewater Associates LP318,044$17m0.08%Added+241,31214 May 2025 (the filing on sec.gov)
Hudson Bay Capital Management LP272,145$14munder 0.1%Added+70,53214 May 2025 (the filing on sec.gov)
ExodusPoint Capital Management LP262,878$14m0.14%Addedn.a.14 May 2025 (the filing on sec.gov)
Tudor Investment Corp228,272$12munder 0.1%Newnew15 May 2025 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC224,182$12m0.07%Addedn.a.15 May 2025 (the filing on sec.gov)
Moore Capital Management LP186,849$9.7m0.20%Added+127,03212 Aug 2025 (the filing on sec.gov)
Davidson Kempner Capital Management LP175,000$9.1m0.13%Newnew15 May 2025 (the filing on sec.gov)
PDT Partners LLC98,362$5.1m0.36%Added+13,10015 May 2025 (the filing on sec.gov)
Brevan Howard Capital Management LP89,812$4.7munder 0.1%Added+32,58615 May 2025 (the filing on sec.gov)
Winton Group Ltd20,830$1.1m0.07%Trimmed-30,08615 May 2025 (the filing on sec.gov)
ARK Investment Management LLC1,545$80kunder 0.1%Added+1207 May 2025 (the filing on sec.gov)

Largest increases and reductions, by shares

Q4 2024 to Q1 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 (4)

Exited (0)

No exit shown by a manager’s own filing.

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 →