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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
30 Sep 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 Nov 2025
Managers listing it
18
at least, of 95 tracked, among listed positions
Comparable managers
95
filed both Q2 2025 and Q3 2025; 13 listed it in both
Shares listed
20,944,538
combined, among listed positions
Reported value
$1.7bn
combined, at the quarter end

Among the 95 comparable managers: 11 buyers (opened or added shares) and 8 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 Q3 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

18 of 18 holders

ActionFiling
Capital World Investors7,900,572$643m0.09%Added+1,080,20113 Nov 2025 (the filing on sec.gov)
Capital Research Global Investors3,224,970$262munder 0.1%Held013 Nov 2025 (the filing on sec.gov)
D. E. Shaw & Co.3,027,102$246m0.14%Trimmed-486,84614 Nov 2025 (the filing on sec.gov)
Holocene Advisors LP1,534,114$125m0.28%Added+929,33314 Nov 2025 (the filing on sec.gov)
Neuberger Berman Group LLC948,412$77m0.06%Added+169,93027 Oct 2026 (the filing on sec.gov)
Woodline Partners LP747,127$61m0.29%Trimmed-91,49414 Nov 2025 (the filing on sec.gov)
Voloridge Investment Management LLC580,467$47m0.16%Trimmed-242,22914 Nov 2025 (the filing on sec.gov)
Davidson Kempner Capital Management LP530,000$43m0.55%Added+400,00014 Nov 2025 (the filing on sec.gov)
Rokos Capital Management LLP527,256$43m0.18%Newnew14 Nov 2025 (the filing on sec.gov)
Marshall Wace LLP513,939$42munder 0.1%Addedn.a.13 Nov 2025 (the filing on sec.gov)
GAMCO Investors Inc395,800$32m0.31%Trimmed-5,00012 Nov 2025 (the filing on sec.gov)
Point72 Asset Management LP309,194$25munder 0.1%Trimmed-477,06514 Nov 2025 (the filing on sec.gov)
Moore Capital Management LP211,002$17m0.24%Added+48,03714 Nov 2025 (the filing on sec.gov)
Hudson Bay Capital Management LP154,784$13munder 0.1%Trimmed-52,01915 Dec 2025 (the filing on sec.gov)
Bridgewater Associates LP136,458$11munder 0.1%Newnew13 Nov 2025 (the filing on sec.gov)
Discovery Capital Management LLC105,100$8.5m0.47%Newnew14 Nov 2025 (the filing on sec.gov)
Winton Group Ltd97,499$7.9m0.30%Addedn.a.13 Nov 2025 (the filing on sec.gov)
ARK Investment Management LLC742$60kunder 0.1%Added+58712 Nov 2025 (the filing on sec.gov)

Largest increases and reductions, by shares

Q2 2025 to Q3 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 (3)

Exited (2)

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 →