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

SecuritySSD / Simpson Manufacturing Co., Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership154,278 shares
Latest Disclosed Value $ 24,911,213
Sei Investments Co reports 14.67% increase in ownership of SSD / Simpson Manufacturing Co., Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 154,278 shares of Simpson Manufacturing Co., Inc. (US:SSD) valued at $24,911,269 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 134,539 shares of Simpson Manufacturing Co., Inc.. This represents a change in shares of 14.67% during the quarter. The current value of the position is $28,820,673 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)
2026-02-13 2025-12-31 13F SIMPSON MFG COM 829073105 154,278 19,739 14.67 24,911 10.57 0.0246
2025-11-13 2025-09-30 13F SIMPSON MFG COM 829073105 134,539 -1,634 -1.20 22,530 6.53 0.0242
2025-08-14 2025-06-30 13F SIMPSON MFG COM 829073105 136,173 840 0.62 21,149 -0.51 0.0245
2025-05-14 2025-03-31 13F/A-1 SIMPSON MFG COM 829073105 135,333 -290 -0.21 21,258 -5.48 0.0274
2025-05-13 2025-03-31 13F SIMPSON MFG COM 829073105 135,598 -25 22,481 0.0245
2025-02-11 2024-12-31 13F SIMPSON MFG COM 829073105 135,623 49,257 57.03 22,490 36.15 0.0289
2024-11-12 2024-09-30 13F SIMPSON MFG COM 829073105 86,366 -1,852 -2.10 16,519 11.10 0.0215
2024-08-13 2024-06-30 13F SIMPSON MFG COM 829073105 88,218 7,468 9.25 14,868 -10.27 0.0211
2024-05-07 2024-03-31 13F SIMPSON MFG COM 829073105 80,750 15,911 24.54 16,569 29.07 0.0243
2024-02-14 2023-12-31 13F SIMPSON MFG COM 829073105 64,839 -5,661 -8.03 12,837 21.54 0.0206
2023-11-14 2023-09-30 13F SIMPSON MFG COM 829073105 70,500 -2,985 -4.06 10,562 3.78 0.0190
2023-08-11 2023-06-30 13F SIMPSON MFG COM 829073105 73,485 16,011 27.86 10,178 61.51 0.0178
2023-05-12 2023-03-31 13F SIMPSON MFG COM 829073105 57,474 22,571 64.67 6,301 103.65 0.0117
2023-02-10 2022-12-31 13F SIMPSON MFG COM 829073105 34,903 -13,673 -28.15 3,095 -18.75 0.0069
2022-11-14 2022-09-30 13F SIMPSON MFG COM 829073105 48,576 -2,132 -4.20 3,808 -25.35 0.0085
2022-08-15 2022-06-30 13F SIMPSON MFG COM 829073105 50,708 18,341 56.67 5,101 44.50 0.0110
2022-05-13 2022-03-31 13F SIMPSON MFG COM 829073105 32,367 -15,045 -31.73 3,530 -46.55 0.0071
2022-02-14 2021-12-31 13F SIMPSON MFG COM 829073105 47,412 -1,369 -2.81 6,604 27.27 0.0124
2021-11-12 2021-09-30 13F SIMPSON MFG COM 829073105 48,781 -598 -1.21 5,189 -4.84 0.0109
2021-08-06 2021-06-30 13F SIMPSON MFG COM 829073105 49,379 4,273 9.47 5,453 16.54 0.0121
2021-05-12 2021-03-31 13F SIMPSON MFG COM 829073105 45,106 9,544 26.84 4,679 40.81 0.0118
2021-02-08 2020-12-31 13F SIMPSON MANUFACTURING COM 829073105 35,562 -28,756 -44.71 3,323 -46.55 0.0086
2020-12-04 2020-09-30 13F/A-1 SIMPSON MANUFACTURING COM 829073105 64,318 562 0.88 6,217 15.90 0.0180
2020-11-06 2020-09-30 13F SIMPSON MANUFACTURING COM 829073105 66,001 2,245 6,381 15,364.0293
2020-08-17 2020-06-30 13F/A-1 SIMPSON MANUFACTURING COM 829073105 63,756 2,375 3.87 5,364 43.04 0.0166
2020-08-11 2020-06-30 13F SIMPSON MANUFACTURING COM 829073105 66,729 5,348 5,469 14,834.9536
2020-05-14 2020-03-31 13F SIMPSON MANUFACTURING COM 829073105 61,381 5,264 9.38 3,750 -15.60 0.0138
2020-02-06 2019-12-31 13F SIMPSON MANUFACTURING COM 829073105 56,117 -207 -0.37 4,443 16.07 0.0133
2019-11-12 2019-09-30 13F SIMPSON MANUFACTURING COM 829073105 56,324 40,395 253.59 3,828 262.50 0.0098
2019-08-14 2019-06-30 13F SIMPSON MANUFACTURING COM 829073105 15,929 -450 -2.75 1,056 9.54 0.0034
2019-05-15 2019-03-31 13F SIMPSON MANUFACTURING COM 829073105 16,379 -11,749 -41.77 964 -43.29 0.0032
2019-02-13 2018-12-31 13F SIMPSON MANUFACTURING COM 829073105 28,128 18,484 191.66 1,700 143.20 0.0061
2018-11-08 2018-09-30 13F SIMPSON MANUFACTURING COM 829073105 9,644 7,159 288.09 699 353.90 0.0025
2018-08-03 2018-06-30 13F SIMPSON MANUFACTURING COM 829073105 2,485 893 56.09 154 69.23 0.0005
2018-05-11 2018-03-31 13F SIMPSON MANUFACTURING COM 829073105 1,592 -614 -27.83 91 -28.35 0.0003
2018-02-08 2017-12-31 13F SIMPSON MANUFACTURING COM 829073105 2,206 2,067 1,487.05 127 1,714.29 0.0004
2017-11-06 2017-09-30 13F SIMPSON MANUFACTURING COM 829073105 139 56 67.47 7 75.00 0.0000
2017-07-31 2017-06-30 13F SIMPSON MANUFACTURING COM 829073105 83 73 730.00 4 0.0000
2017-05-05 2017-03-31 13F SIMPSON MANUFACTURING COM 829073105 10 0 0.00 0 0.0000
2017-02-02 2016-12-31 13F SIMPSON MANUFACTURING COM 829073105 10 0 0.00 0 0.0000
2016-11-04 2016-09-30 13F SIMPSON MANUFACTURING COM 829073105 10 10 0 0.0000
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.