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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 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
42
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 18 listed it in both
Shares listed
38,704,325
combined, among listed positions
Reported value
$5.6bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 27 buyers (opened or added shares) and 15 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +8,512,769.

Managers listing ATI in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

42 of 42 holders

ActionFiling
Capital Research Global Investors6,160,107$896m0.14%Added+2,548,38313 May 2026 (the filing on sec.gov)
Capital World Investors5,712,929$831m0.11%Trimmed-1,642,86413 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)5,247,175$763munder 0.1%Added+172,35115 May 2026 (the filing on sec.gov)
Invesco Ltd3,855,643$561m0.05%Added+470,71912 May 2026 (the filing on sec.gov)
Viking Global Investors LP3,332,843$485m1.36%Newnew15 May 2026 (the filing on sec.gov)
Point72 Asset Management LP1,932,579$281m0.36%Added+1,172,40215 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.1,742,609$253m0.15%Trimmed-280,01215 May 2026 (the filing on sec.gov)
Jane Street Group LLC1,491,263$217munder 0.1%Added+1,214,06512 May 2026 (the filing on sec.gov)
Arrowstreet Capital LP1,203,726$175m0.09%Added+840,45514 May 2026 (the filing on sec.gov)
AQR Capital Management LLC1,222,580$174m0.08%Added+202,74015 May 2026 (the filing on sec.gov)
Holocene Advisors LP1,097,588$160m0.39%Added+25,84315 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC851,664$124m0.16%Added+461,67815 May 2026 (the filing on sec.gov)
Millennium Management LLC619,240$90munder 0.1%Added+112,35915 May 2026 (the filing on sec.gov)
Freestone Grove Partners LP575,873$84m0.59%Newnew15 May 2026 (the filing on sec.gov)
Marshall Wace LLP536,478$78m0.08%Trimmed-91,80715 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC494,925$72m0.05%Trimmed-327,78927 Oct 2026 (the filing on sec.gov)
AllianceBernstein LP575,528$66munder 0.1%Added+269,01115 May 2026 (the filing on sec.gov)
GAMCO Investors Inc361,500$53m0.52%Trimmed-21,60014 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc328,732$48munder 0.1%Trimmed-169,44515 May 2026 (the filing on sec.gov)
Citadel Advisors LLC303,296$44munder 0.1%Added+200,59415 May 2026 (the filing on sec.gov)
Walleye Capital LLC146,109$21m0.09%Added+43,81113 May 2026 (the filing on sec.gov)
Woodline Partners LP89,389$13munder 0.1%Trimmed-381,80615 May 2026 (the filing on sec.gov)
Tudor Investment Corp88,935$13munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP88,212$13m0.10%Added+70,57814 May 2026 (the filing on sec.gov)
Rokos Capital Management LLP80,343$12m0.09%Newnew15 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, 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 (8)

Exited (1)

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 →