Gibraltar Industries, Inc.
US ˙ NasdaqGS ˙ US3746891072

SecurityROCK / Gibraltar Industries, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership333,896 shares
Latest Disclosed Value $ 13,312,434
Northern Trust Corp reports 3.64% increase in ownership of ROCK / Gibraltar Industries, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 333,896 shares of Gibraltar Industries, Inc. (US:ROCK) valued at $13,312,434 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 322,175 shares of Gibraltar Industries, Inc.. This represents a change in shares of 3.64% during the quarter. The current value of the position is $12,788,217 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F GIBRALTAR INDS COM 374689107 333,896 11,721 3.64 13,312 -16.42 0.0004
2026-02-17 2025-12-31 13F GIBRALTAR INDS COM 374689107 322,175 -29,981 -8.51 15,928 -27.98 0.0004
2025-11-14 2025-09-30 13F GIBRALTAR INDS COM 374689107 352,156 50 0.01 22,115 6.46 0.0028
2025-08-13 2025-06-30 13F GIBRALTAR INDS COM 374689107 352,106 -15,219 -4.14 20,774 -3.59 0.0029
2025-05-13 2025-03-31 13F GIBRALTAR INDS COM 374689107 367,325 338 0.09 21,547 -0.31 0.0032
2025-02-14 2024-12-31 13F GIBRALTAR INDS COM 374689107 366,987 32,520 9.72 21,616 -7.58 0.0031
2024-11-13 2024-09-30 13F GIBRALTAR INDS COM 374689107 334,467 -6,731 -1.97 23,389 0.00 0.0038
2024-08-14 2024-06-30 13F GIBRALTAR INDS COM 374689107 341,198 -10,893 -3.09 23,389 -17.51 0.0039
2024-05-14 2024-03-31 13F GIBRALTAR INDS COM 374689107 352,091 -18,508 -4.99 28,354 -3.13 0.0049
2024-02-13 2023-12-31 13F GIBRALTAR INDS COM 374689107 370,599 -6,475 -1.72 29,270 14.98 0.0053
2023-11-13 2023-09-30 13F GIBRALTAR INDS COM 374689107 377,074 -4,199 -1.10 25,456 6.12 0.0049
2023-08-11 2023-06-30 13F GIBRALTAR INDS COM 374689107 381,273 8,369 2.24 23,990 32.65 0.0046
2023-05-15 2023-03-31 13F GIBRALTAR INDS COM 374689107 372,904 -409 -0.11 18,086 5.59 0.0036
2023-02-13 2022-12-31 13F GIBRALTAR INDS COM 374689107 373,313 6,655 1.82 17,128 14.12 0.0036
2022-11-14 2022-09-30 13F GIBRALTAR INDS COM 374689107 366,658 -10,958 -2.90 15,008 2.56 0.0034
2022-08-12 2022-06-30 13F GIBRALTAR INDS COM 374689107 377,616 -3,440 -0.90 14,633 -10.58 0.0031
2022-05-13 2022-03-31 13F GIBRALTAR INDS COM 374689107 381,056 -9,819 -2.51 16,365 -37.21 0.0029
2022-02-08 2021-12-31 13F GIBRALTAR INDS COM 374689107 390,875 -8,742 -2.19 26,063 -6.36 0.0043
2021-11-15 2021-09-30 13F GIBRALTAR INDS COM 374689107 399,617 -2,498 -0.62 27,832 -9.29 0.0049
2021-08-13 2021-06-30 13F GIBRALTAR INDS COM 374689107 402,115 2,151 0.54 30,684 -16.16 0.0054
2021-05-12 2021-03-31 13F GIBRALTAR INDS COM 374689107 399,964 -34,684 -7.98 36,600 17.05 0.0068
2021-02-11 2020-12-31 13F GIBRALTAR INDS COM 374689107 434,648 -15,979 -3.55 31,268 6.52 0.0061
2020-11-16 2020-09-30 13F GIBRALTAR INDS COM 374689107 450,627 38,973 9.47 29,354 48.53 0.0064
2020-08-14 2020-06-30 13F GIBRALTAR INDS COM 374689107 411,654 -47,525 -10.35 19,763 0.28 0.0047
2020-05-14 2020-03-31 13F GIBRALTAR INDS COM 374689107 459,179 1,508 0.33 19,707 -14.63 0.0057
2020-02-14 2019-12-31 13F GIBRALTAR INDS COM 374689107 457,671 -7,770 -1.67 23,085 7.96 0.0052
2019-11-13 2019-09-30 13F GIBRALTAR INDS COM 374689107 465,441 16,965 3.78 21,383 18.13 0.0051
2019-08-13 2019-06-30 13F GIBRALTAR INDS COM 374689107 448,476 10,872 2.48 18,101 1.85 0.0043
2019-05-13 2019-03-31 13F GIBRALTAR INDS COM 374689107 437,604 -38 -0.01 17,772 14.11 0.0044
2019-02-12 2018-12-31 13F GIBRALTAR INDS COM 374689107 437,642 -1,347 -0.31 15,574 -22.20 0.0044
2018-11-14 2018-09-30 13F GIBRALTAR INDS COM 374689107 438,989 7,103 1.64 20,017 23.59 0.0049
2018-09-18 2018-06-30 13F/A-1 GIBRALTAR INDS COM 374689107 431,886 36,616 9.26 16,196 21.05 0.0041
2018-08-14 2018-06-30 13F GIBRALTAR INDS COM 374689107 433,958 38,688 16,273
2018-05-09 2018-03-31 13F GIBRALTAR INDS COM 374689107 395,270 8,493 2.20 13,380 4.83 0.0035
2018-02-14 2017-12-31 13F GIBRALTAR INDS COM 374689107 386,777 -110,787 -22.27 12,764 -17.65 0.0032
2017-11-13 2017-09-30 13F GIBRALTAR INDS COM 374689107 497,564 -722,437 -59.22 15,499 -64.36 0.0040
2017-08-11 2017-06-30 13F GIBRALTAR INDS COM 374689107 1,220,001 4,944 0.41 43,492 -13.12 0.0122
2017-05-12 2017-03-31 13F GIBRALTAR INDS COM 374689107 1,215,057 6,376 0.53 50,060 -0.56 0.0144
2017-02-13 2016-12-31 13F GIBRALTAR INDS COM 374689107 1,208,681 -14,959 -1.22 50,342 10.74 0.0154
2016-11-09 2016-09-30 13F GIBRALTAR INDS COM 374689107 1,223,640 9,325 0.77 45,458 18.58 0.0142
2016-08-12 2016-06-30 13F GIBRALTAR INDS COM 374689107 1,214,315 33,974 2.88 38,336 14.71 0.0124
2016-08-19 2016-03-31 13F/A-1 GIBRALTAR INDS COM 374689107 1,180,341 8,888 0.76 33,419 12.14 0.0111
2016-05-13 2016-03-31 13F Gibraltar Inds COMM 374689107 1,180,341 33,759
2016-02-12 2015-12-31 13F Gibraltar Inds COMM 374689107 1,171,453 -34,690 -2.88 29,802 34.65 0.0099
2015-11-12 2015-09-30 13F Gibraltar Inds COMM 374689107 1,206,143 40,847 3.51 22,133 -6.76 0.0074
2015-08-13 2015-06-30 13F GIBRALTAR INDS COM 374689107 1,165,296 -46,065 -3.80 23,738 19.42 0.0161
2015-08-13 2015-06-30 13F Gibraltar Inds COMM 037468910 33,100 -1,178,261 674 0.0005
2015-05-14 2015-03-31 13F Gibraltar Inds COMM 374689107 1,211,361 58,606 5.08 19,878 6.05 0.0060
2015-02-12 2014-12-31 13F GIBRALTAR INDS COM 374689107 1,152,755 7,080 0.62 18,744 19.51 0.0057
2014-11-13 2014-09-30 13F GIBRALTAR INDS COM 374689107 1,145,675 23,707 2.11 15,684 -9.87 0.0049
2014-08-14 2014-06-30 13F GIBRALTAR INDS COM 374689107 1,121,968 -1,655 -0.15 17,402 -17.93 0.0054
2014-05-14 2014-03-31 13F GIBRALTAR INDS COM 374689107 1,123,623 -38,360 -3.30 21,203 -1.85 0.0067
2014-02-21 2013-12-31 13F/A-1 GIBRALTAR INDS COM 374689107 1,161,983 48,700 4.37 21,602 36.08 0.0069
2014-02-12 2013-12-31 13F GIBRALTAR INDS COM 374689107 1,161,983 21,602
2013-11-13 2013-09-30 13F GIBRALTAR INDS COM 374689107 1,113,283 26,106 2.40 15,875 0.29 0.0056
2013-08-09 2013-06-30 13F GIBRALTAR INDS COM 374689107 1,087,177 1,087,177 15,829 0.0057
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.