Boston Partners
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Boston Partners’s Gibraltar Industries ROCK Stock Holding History

Boston Partners’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
2026
Q2 		$20.7M Sell
464,628
-221,997
-32% -$8.7M 0.02% 390
2026
Q1 		$27.3M Sell
686,625
-237,086
-26% -$11.5M 0.03% 338
2025
Q4 		$46M Buy
923,711
+897,935
+3,484% +$51.5M 0.05% 279
2025
Q3 		$1.62M Buy
+25,776
New +$1.61M ﹤0.01% 584
2023
Q1 		– Sell
-14,515
Closed -$666K – 747
2022
Q4 		$666K Buy
14,515
+337
+2% +$16.2K ﹤0.01% 560
2022
Q3 		$580K Buy
14,178
+282
+2% +$12K ﹤0.01% 582
2022
Q2 		$538K Buy
13,896
+5,525
+66% +$225K ﹤0.01% 597
2022
Q1 		$360K Buy
8,371
+244
+3% +$12.9K ﹤0.01% 640
2021
Q4 		$542K Sell
8,127
-1,115
-12% -$79.6K ﹤0.01% 604
2021
Q3 		$644K Sell
9,242
-1,332
-13% -$95.8K ﹤0.01% 581
2021
Q2 		$807K Sell
10,574
-1,315
-11% -$109K ﹤0.01% 573
2021
Q1 		$1.09M Sell
11,889
-4,555
-28% -$418K ﹤0.01% 569
2020
Q4 		$1.18M Sell
16,444
-8,674
-35% -$579K ﹤0.01% 519
2020
Q3 		$1.64M Sell
25,118
-241
-1% -$14.2K ﹤0.01% 447
2020
Q2 		$1.22M Sell
25,359
-3,577
-12% -$159K ﹤0.01% 496
2020
Q1 		$1.24M Buy
+28,936
New +$1.45M ﹤0.01% 489
2014
Q1 		– Sell
-292,202
Closed -$5.43M – 740
2013
Q4 		$5.43M Hold
292,202
– – 0.01% 498
2013
Q3 		$4.17M Sell
292,202
-96,115
-25% -$1.38M 0.01% 518
2013
Q2 		$5.65M Buy
+388,317
New +$6.56M 0.02% 432

Other funds holding ROCK

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
AllianceBernstein
AllianceBernstein Nashville, Tennessee $302B AUM 26.44% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Barrow, Hanley, Mewhinney & Strauss
Barrow, Hanley, Mewhinney & Strauss Dallas, Texas $33B AUM 40.62% 1-Year Est. Return
FCM
Frontier Capital Management Boston, Massachusetts $10.7B AUM 67.78% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Boston Partners's ROCK Position: Q2 2026 in Review

Boston Partners reduced its Gibraltar Industries (ROCK) stake by 32% in Q2 2026, selling an estimated $8.7M and leaving 464,628 shares worth $20.7M. The position accounts for 0.02% of the portfolio, ranked #390.

Boston Partners first reported a position in ROCK in Q2 2013 and has held it in 19 quarters since. The position peaked at $46M in Q4 2025. 245 funds tracked by Wall St. Rank hold ROCK as of Q2 2026.

  • Boston Partners held 464,628 shares of Gibraltar Industries worth $20.7M as of Q2 2026.
  • Boston Partners sold 221,997 Gibraltar Industries shares in Q2 2026, an estimated $8.7M.
  • Gibraltar Industries made up 0.02% of Boston Partners's portfolio in Q2 2026, its #390 holding.
  • Boston Partners first reported a position in Gibraltar Industries in Q2 2013 and has held it in 19 quarters since.
  • Boston Partners's Gibraltar Industries position peaked at $46M in Q4 2025.
  • 245 funds tracked by Wall St. Rank held Gibraltar Industries as of Q2 2026.

Based on Boston Partners's 13F filing for Q2 2026, filed 4 Aug 2026.