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ATI · GLW in the 13F filings

Two to four stocks side by side among the 95 tracked managers: who lists them, how that has moved, who bought and sold in a quarter, and which managers hold more than one.

ATIGLW
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023

Holders over time

Tracked managers listing each stock every quarter, at least, or their combined reported value. A gap is a quarter in which no tracked manager listed it. Click a quarter to compare there.
  • ATI
  • GLW
010203040202120222023202420252026
Holders and value by quarter
QuarterATIGLW
Q3 20207 holders, $85m11 holders, $3.4bn
Q4 20207 holders, $167m18 holders, $3.6bn
Q1 20217 holders, $218m11 holders, $4.6bn
Q2 20216 holders, $171m16 holders, $4.0bn
Q3 20218 holders, $143m14 holders, $3.2bn
Q4 20217 holders, $113m16 holders, $3.1bn
Q1 20228 holders, $266m18 holders, $2.6bn
Q2 20228 holders, $399m14 holders, $2.3bn
Q3 202212 holders, $433m14 holders, $1.6bn
Q4 202211 holders, $451m12 holders, $1.7bn
Q1 202310 holders, $436m18 holders, $2.3bn
Q2 202312 holders, $504m10 holders, $1.9bn
Q3 202311 holders, $409m8 holders, $1.4bn
Q4 202312 holders, $567m12 holders, $1.6bn
Q1 202411 holders, $598m11 holders, $2.2bn
Q2 202419 holders, $903m11 holders, $3.3bn
Q3 202423 holders, $1.8bn17 holders, $4.3bn
Q4 202416 holders, $735m22 holders, $4.1bn
Q1 202521 holders, $852m24 holders, $3.1bn
Q2 202519 holders, $2.0bn25 holders, $3.3bn
Q3 202518 holders, $1.7bn26 holders, $6.2bn
Q4 202519 holders, $3.1bn27 holders, $7.2bn
Q1 202627 holders, $5.4bn33 holders, $12.8bn
Q2 202633 holders, $6.4bn26 holders, $23.6bn
ATI

Allegheny Technologies Inc

Holders
27
Reported value
$5.4bn
Buyers
27
Sellers
15

Breadth +12 among 91 comparable managers.

Materials
GLW

Corning Inc

Holders
33
Reported value
$12.8bn
Buyers
24
Sellers
20

Breadth +4 among 91 comparable managers.

Materials

Who holds both, Q1 2026

Among the 42 tracked managers listing any of them. "Only" is about listed positions: a manager may hold the other below its listed range.

Only ATI (9)

ARK Investment Management LLC, D. E. Shaw & Co., Freestone Grove Partners LP, Moore Capital Management LP, Quantbot Technologies LP, Soros Fund Management LLC, Viking Global Investors LP, Walleye Capital LLC, Winton Group Ltd

Only GLW (15)

Acadian Asset Management LLC, AllianceBernstein LP, Appaloosa LP, Dodge & Cox, Lone Pine Capital LLC, Maverick Capital Ltd, MFS Investment Management, PDT Partners LLC, Schonfeld Strategic Advisors LLC, Squarepoint Ops LLC, T. Rowe Price Associates Inc, Tudor Investment Corp, Verition Fund Management LLC, Wellington Management Group LLP, Whale Rock Capital Management LLC

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. Buyers and sellers count comparable managers (those that filed both quarters) by shares, so a rise in value with no rise in shares is the price. Large books are listed to their largest positions. These are 95 tracked managers, not the institutional market.

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