Simpson Manufacturing Co., Inc.
US ˙ NYSE ˙ US8290731053

SecuritySSD / Simpson Manufacturing Co., Inc.
InstitutionBrown Advisory Inc
Latest Disclosed Ownership303,624 shares
Latest Disclosed Value $ 52,108,068
Brown Advisory Inc reports 7.32% decrease in ownership of SSD / Simpson Manufacturing Co., Inc.

On May 15, 2026 - Brown Advisory Inc filed a 13F-HR form disclosing ownership of 303,624 shares of Simpson Manufacturing Co., Inc. (US:SSD) valued at $52,107,951 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 327,606 shares of Simpson Manufacturing Co., Inc.. This represents a change in shares of -7.32% during the quarter. The current value of the position is $57,142,037 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)
2026-05-15 2026-03-31 13F SIMPSON MFG COM 829073105 303,624 -23,982 -7.32 52,108 -1.49 0.0382
2026-02-13 2025-12-31 13F SIMPSON MFG COM 829073105 327,606 131,381 66.95 52,899 60.98 0.0738
2025-11-14 2025-09-30 13F SIMPSON MFG COM 829073105 196,225 39,840 25.48 32,860 35.29 0.0428
2025-08-13 2025-06-30 13F SIMPSON MFG COM 829073105 156,385 -8,824 -5.34 24,288 -6.41 0.0320
2025-04-30 2025-03-31 13F SIMPSON MFG COM 829073105 165,209 -3,093 -1.84 25,951 -7.02 0.0371
2025-02-14 2024-12-31 13F SIMPSON MFG COM 829073105 168,302 164,836 4,755.80 27,910 4,115.86 0.0354
2024-11-13 2024-09-30 13F SIMPSON MFG COM 829073105 3,466 -47 -1.34 663 11.82 0.0008
2024-08-14 2024-06-30 13F SIMPSON MFG COM 829073105 3,513 113 3.32 592 -15.06 0.0008
2024-04-24 2024-03-31 13F SIMPSON MFG COM 829073105 3,400 0 0.00 698 3.57 0.0009
2024-02-08 2023-12-31 13F SIMPSON MFG COM 829073105 3,400 5 0.15 673 32.48 0.0009
2023-10-25 2023-09-30 13F SIMPSON MFG COM 829073105 3,395 -180 -5.03 509 2.63 0.0008
2023-07-31 2023-06-30 13F SIMPSON MFG COM 829073105 3,575 0 0.00 495 26.60 0.0008
2023-05-08 2023-03-31 13F SIMPSON MFG COM 829073105 3,575 -280 -7.26 392 14.66 0.0007
2023-02-13 2022-12-31 13F SIMPSON MFG COM 829073105 3,855 -8 -0.21 342 12.91 0.0006
2022-11-14 2022-09-30 13F SIMPSON MFG COM 829073105 3,863 -252,213 -98.49 302 -98.83 0.0006
2022-11-14 2022-06-30 13F/A-2 SIMPSON MFG COM 829073105 256,076 -6,400 -2.44 25,764 -9.98 0.0484
2022-09-13 2022-06-30 13F/A-1 SIMPSON MFG COM 829073105 254,522 -6,448 25,608 0.0443
2022-08-02 2022-06-30 13F SIMPSON MFG COM 829073105 257,331 -6,482 26,396 0.0424
2022-11-14 2022-03-31 13F/A-2 SIMPSON MFG COM 829073105 262,476 -83,102 -24.05 28,620 -40.45 0.0427
2022-09-13 2022-03-31 13F/A-1 SIMPSON MFG COM 829073105 260,970 -84,608 28,456 0.0400
2022-05-09 2022-03-31 13F SIMPSON MFG COM 829073105 263,813 -81,765 29,161 0.0396
2022-01-27 2021-12-31 13F SIMPSON MFG COM 829073105 345,578 8,599 2.55 48,059 33.32 0.0596
2021-11-12 2021-09-30 13F SIMPSON MFG COM 829073105 336,979 -15,033 -4.27 36,048 -7.27 0.0532
2021-07-29 2021-06-30 13F SIMPSON MFG COM 829073105 352,012 -3,754 -1.06 38,876 5.35 0.0586
2021-05-14 2021-03-31 13F SIMPSON MFG COM 829073105 355,766 15,339 4.51 36,903 16.00 0.0631
2021-02-12 2020-12-31 13F SIMPSON MANUFACTURING COM 829073105 340,427 1,813 0.54 31,813 -3.30 0.0565
2020-11-16 2020-09-30 13F SIMPSON MANUFACTURING COM 829073105 338,614 -1,377 -0.41 32,900 14.71 0.0680
2020-08-14 2020-06-30 13F SIMPSON MANUFACTURING COM 829073105 339,991 -32,206 -8.65 28,682 24.33 0.0668
2020-05-15 2020-03-31 13F SIMPSON MANUFACTURING COM 829073105 372,197 -3,347 -0.89 23,069 -23.44 0.0707
2020-02-14 2019-12-31 13F SIMPSON MANUFACTURING COM 829073105 375,544 -1,193 -0.32 30,131 15.29 0.0764
2019-11-14 2019-09-30 13F SIMPSON MANUFACTURING COM 829073105 376,737 -100,576 -21.07 26,135 -17.61 0.0733
2019-08-12 2019-06-30 13F SIMPSON MANUFACTURING COM 829073105 477,313 -209,416 -30.49 31,722 -22.06 0.0908
2019-05-15 2019-03-31 13F SIMPSON MANUFACTURING COM 829073105 686,729 -154,771 -18.39 40,703 -10.64 0.1154
2019-02-13 2018-12-31 13F SIMPSON MANUFACTURING COM 829073105 841,500 -61,539 -6.81 45,550 -30.39 0.1530
2018-11-13 2018-09-30 13F SIMPSON MANUFACTURING COM 829073105 903,039 -115,844 -11.37 65,435 3.27 0.1862
2018-08-10 2018-06-30 13F SIMPSON MANUFACTURING COM 829073105 1,018,883 3,217 0.32 63,364 8.33 0.1949
2018-06-28 2018-03-31 13F/A-1 SIMPSON MANUFACTURING COM 829073105 1,015,666 86,051 9.26 58,492 9.60 0.1891
2018-05-14 2018-03-31 13F SIMPSON MANUFACTURING COM 829073105 287,164 -642,451 16,537
2018-02-12 2017-12-31 13F SIMPSON MANUFACTURING COM 829073105 929,615 105,562 12.81 53,369 32.07 0.1690
2017-11-13 2017-09-30 13F SIMPSON MANUFACTURING COM 829073105 824,053 100,558 13.90 40,411 27.79 0.1340
2017-08-14 2017-06-30 13F SIMPSON MANUFACTURING COM 829073105 723,495 277,682 62.29 31,624 64.62 0.0967
2017-05-15 2017-03-31 13F SIMPSON MANUFACTURING COM 829073105 445,813 445,813 19,210 0.0655
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.