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ROCK in the 13F filings

Gibraltar Industries Inc · CUSIP 374689107

Sector · Materials
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
30 Jun 2026
the date the book describes
Filed
2 Sep 2026
latest of these filings; the earliest 12 Aug 2026
Managers listing it
22
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q1 2026 and Q2 2026; 4 listed it in both
Shares listed
8,342,335
combined, among listed positions
Reported value
$365m
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: 18 buyers (opened or added shares) and 8 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +657,535.

Managers listing ROCK in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

22 of 22 holders

ActionFiling
Fidelity (FMR LLC)4,449,287$201munder 0.1%Added+17,22813 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP2,232,832$89munder 0.1%Added+34,37914 Aug 2026 (the filing on sec.gov)
Balyasny Asset Management LLC243,403$11munder 0.1%Added+126,62714 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.224,747$10munder 0.1%Trimmed-24,92514 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC191,107$8.6munder 0.1%Added+72,6582 Sep 2026 (the filing on sec.gov)
AQR Capital Management LLC159,586$7.2munder 0.1%Added+63,55314 Aug 2026 (the filing on sec.gov)
Invesco Ltd144,410$6.5munder 0.1%Trimmed-13,91914 Aug 2026 (the filing on sec.gov)
GAMCO Investors Inc96,625$4.4munder 0.1%Trimmed-9,17012 Aug 2026 (the filing on sec.gov)
Susquehanna International Group LLP85,913$3.9munder 0.1%Added+70,44114 Aug 2026 (the filing on sec.gov)
Man Group PLC83,282$3.8munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC83,148$3.8munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC66,668$3.0munder 0.1%Added+51,16813 Aug 2026 (the filing on sec.gov)
Millennium Management LLC56,573$2.6munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc50,504$2.3munder 0.1%Added+7,96514 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP43,345$2.0munder 0.1%Added+32,85413 Aug 2026 (the filing on sec.gov)
Caxton Associates LLP31,979$1.4munder 0.1%Added+1,25214 Aug 2026 (the filing on sec.gov)
Quantbot Technologies LP23,051$1.0munder 0.1%Added+21,07512 Aug 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP20,490$924kunder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Freestone Grove Partners LP17,859$805kunder 0.1%Trimmed-6,23314 Aug 2026 (the filing on sec.gov)
Janus Henderson Group Ltd14,146$638kunder 0.1%Added+3914 Aug 2026 (the filing on sec.gov)
Jane Street Group LLC12,729$574kunder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP10,651$480kunder 0.1%Added+4,46614 Aug 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q1 2026 to Q2 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 (5)

Exited (4)

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.
2 in Q3 2024 to 3 in Q2 2026

Tracked managers listing it, at least.

02462016201720182020202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
ROCK by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20152$29mn.a.n.a.
Q1 20161$30mn.a.n.a.
Q2 20161$29mn.a.n.a.
Q3 20161$36mn.a.n.a.
Q4 20162$53mn.a.n.a.
Q1 20171$49mn.a.n.a.
Q2 20171$3.2mn.a.n.a.
Q3 20173$5.3mn.a.n.a.
Q4 20172$3.8mn.a.n.a.
Q1 20181$1.3mn.a.n.a.
Q2 20181$5.3mn.a.n.a.
Q3 20181$9.6mn.a.n.a.
Q3 20192$11mn.a.n.a.
Q4 20194$13mn.a.n.a.
Q1 20202$16mn.a.n.a.
Q2 20201$2.5mn.a.n.a.
Q3 20203$237mn.a.n.a.
Q4 20203$269mn.a.n.a.
Q1 20213$333mn.a.n.a.
Q2 20212$3.7mn.a.n.a.
Q3 20212$4.1mn.a.n.a.
Q4 20212$4.6mn.a.n.a.
Q1 20223$6.3mn.a.n.a.
Q2 20224$8.8mn.a.n.a.
Q3 20223$8.0mn.a.n.a.
Q4 20222$6.1mn.a.n.a.
Q1 20232$8.0mn.a.n.a.
Q2 20233$12mn.a.n.a.
Q3 20234$40mn.a.n.a.
Q4 20236$79m24
Q1 20245$67m32
Q2 20244$70m22
Q3 20242$11m02
Q4 20241$5.1m02
Q1 20252$123m20
Q2 20252$8.9m20
Q3 20251$5.7m01
Q4 20253$90m1413
Q1 20264$115m1411
Q2 20263$95m188

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

ROCK and LIN →ROCK and GLW →ROCK and HWM →Choose a stock to compare with ROCK →

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 ROCK, latest filings →Back to the 13F Explorer →