Ken Griffin
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Ken Griffin’s Gibraltar Industries ROCK Stock Holding History

Ken Griffin’s Portfolio ROCK Stock Details ROCK Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-9,400
Closed -$590K – 13858
2025
Q3 		$590K Buy
9,400
+4,200
+81% +$263K ﹤0.01% 8721
2025
Q2 		$307K Buy
5,200
+300
+6% +$17.2K ﹤0.01% 9761
2025
Q1 		$287K Sell
4,900
-5,900
-55% -$367K ﹤0.01% 9701
2024
Q4 		$636K Buy
10,800
+7,500
+227% +$511K ﹤0.01% 8012
2024
Q3 		$231K Sell
3,300
-14,700
-82% -$1.03M ﹤0.01% 9853
2024
Q2 		$1.23M Buy
18,000
+4,400
+32% +$320K ﹤0.01% 6189
2024
Q1 		$1.1M Buy
13,600
+6,600
+94% +$526K ﹤0.01% 6735
2023
Q4 		$553K Sell
7,000
-10,200
-59% -$697K ﹤0.01% 7883
2023
Q3 		$1.16M Sell
17,200
-3,700
-18% -$253K ﹤0.01% 6261
2023
Q2 		$1.32M Sell
20,900
-18,100
-46% -$979K ﹤0.01% 5912
2023
Q1 		$1.89M Buy
39,000
+13,300
+52% +$680K ﹤0.01% 5499
2022
Q4 		$1.18M Sell
25,700
-11,600
-31% -$557K ﹤0.01% 6497
2022
Q3 		$1.53M Buy
37,300
+700
+2% +$29.9K ﹤0.01% 6124
2022
Q2 		$1.42M Buy
36,600
+7,000
+24% +$286K ﹤0.01% 6241
2022
Q1 		$1.27M Buy
29,600
+15,200
+106% +$801K ﹤0.01% 7145
2021
Q4 		$960K Sell
14,400
-2,000
-12% -$143K ﹤0.01% 8069
2021
Q3 		$1.14M Buy
16,400
+4,900
+43% +$352K ﹤0.01% 7815
2021
Q2 		$878K Sell
11,500
-1,200
-9% -$99.2K ﹤0.01% 8689
2021
Q1 		$1.16M Buy
12,700
+7,400
+140% +$679K ﹤0.01% 7734
2020
Q4 		$381K Sell
5,300
-8,000
-60% -$534K ﹤0.01% 8653
2020
Q3 		$866K Sell
13,300
-4,900
-27% -$289K ﹤0.01% 6288
2020
Q2 		$874K Buy
18,200
+10,700
+143% +$476K ﹤0.01% 6073
2020
Q1 		$322K Buy
+7,500
New +$375K ﹤0.01% 7205

Other funds holding ROCK

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
AllianceBernstein
AllianceBernstein Nashville, Tennessee $309B AUM 23.92% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Barrow, Hanley, Mewhinney & Strauss
Barrow, Hanley, Mewhinney & Strauss Dallas, Texas $33B AUM 40.62% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Mirae Asset Global ETFs Holdings
Mirae Asset Global ETFs Holdings Causeway Bay, Hong Kong $73.7B AUM 53.56% 1-Year Est. Return

Ken Griffin's ROCK Position: Q1 2026 in Review

Ken Griffin increased its Gibraltar Industries (ROCK) stake by 27% in Q1 2026, buying an estimated $1.21M and bringing the position to 118,449 shares worth $4.72M. The position accounts for ﹤0.01% of the portfolio, ranked #4438.

Ken Griffin first reported a position in ROCK in Q2 2013 and has held it in 36 quarters since. The position peaked at $11.6M in Q3 2025. 228 funds tracked by Wall St. Rank hold ROCK as of Q1 2026.

  • Ken Griffin held 118,449 shares of Gibraltar Industries worth $4.72M as of Q1 2026.
  • Ken Griffin bought 25,132 Gibraltar Industries shares in Q1 2026, an estimated $1.21M.
  • Gibraltar Industries made up ﹤0.01% of Ken Griffin's portfolio in Q1 2026, its #4438 holding.
  • Ken Griffin first reported a position in Gibraltar Industries in Q2 2013 and has held it in 36 quarters since.
  • Ken Griffin's Gibraltar Industries position peaked at $11.6M in Q3 2025.
  • 228 funds tracked by Wall St. Rank held Gibraltar Industries as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.