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ROCK · 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.

ROCKGLW
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.
  • ROCK
  • GLW
010203040202120222023202420252026
Holders and value by quarter
QuarterROCKGLW
Q3 20203 holders, $237m11 holders, $3.4bn
Q4 20203 holders, $269m18 holders, $3.6bn
Q1 20213 holders, $333m11 holders, $4.6bn
Q2 20212 holders, $3.7m16 holders, $4.0bn
Q3 20212 holders, $4.1m14 holders, $3.2bn
Q4 20212 holders, $4.6m16 holders, $3.1bn
Q1 20223 holders, $6.3m18 holders, $2.6bn
Q2 20224 holders, $8.8m14 holders, $2.3bn
Q3 20223 holders, $8.0m14 holders, $1.6bn
Q4 20222 holders, $6.1m12 holders, $1.7bn
Q1 20232 holders, $8.0m18 holders, $2.3bn
Q2 20233 holders, $12m10 holders, $1.9bn
Q3 20234 holders, $40m8 holders, $1.4bn
Q4 20236 holders, $79m12 holders, $1.6bn
Q1 20245 holders, $67m11 holders, $2.2bn
Q2 20244 holders, $70m11 holders, $3.3bn
Q3 20242 holders, $11m17 holders, $4.3bn
Q4 20241 holders, $5.1m22 holders, $4.1bn
Q1 20252 holders, $123m24 holders, $3.1bn
Q2 20252 holders, $8.9m25 holders, $3.3bn
Q3 20251 holders, $5.7m26 holders, $6.2bn
Q4 20253 holders, $90m27 holders, $7.2bn
Q1 20264 holders, $115m33 holders, $12.8bn
Q2 20263 holders, $95m26 holders, $23.6bn
ROCK

Gibraltar Industries Inc

Holders
4
Reported value
$115m
Buyers
14
Sellers
11

Breadth +3 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 35 tracked managers listing any of them. "Only" is about listed positions: a manager may hold the other below its listed range.

Only ROCK (2)

Caxton Associates LLP, Freestone Grove Partners LP

Only GLW (31)

Acadian Asset Management LLC, Appaloosa LP, AQR Capital Management LLC, Arrowstreet Capital LP, Balyasny Asset Management LLC, Brevan Howard Capital Management LP, Capital Research Global Investors, Capital World Investors, Dodge & Cox, ExodusPoint Capital Management LP, Fidelity (FMR LLC), Holocene Advisors LP, Invesco Ltd, Jane Street Group LLC, Lone Pine Capital LLC, Marshall Wace LLP, Maverick Capital Ltd, MFS Investment Management, Millennium Management LLC, Neuberger Berman Group LLC, PDT Partners LLC, Point72 Asset Management LP, Rokos Capital Management LLP, Schonfeld Strategic Advisors LLC, Squarepoint Ops LLC, and 6 more

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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