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

SecuritySSD / Simpson Manufacturing Co., Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership1,297,261 shares
Latest Disclosed Value $ 222,636,250
Morgan Stanley reports 13.83% decrease in ownership of SSD / Simpson Manufacturing Co., Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 1,297,261 shares of Simpson Manufacturing Co., Inc. (US:SSD) valued at $222,635,933 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,505,388 shares of Simpson Manufacturing Co., Inc.. This represents a change in shares of -13.83% during the quarter. The current value of the position is $242,341,327 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.

Upgrade to unlock premium data and export to Excel .

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 1,297,261 -208,127 -13.83 222,636 -8.41 0.0134
2026-05-27 2025-12-31 13F/A-1 SIMPSON MFG COM 829073105 1,505,388 -26,038 -1.70 243,075 -5.22 0.0145
2026-02-13 2025-12-31 13F SIMPSON MFG COM 829073105 1,505,388 -26,038 243,075 0.0145
2026-05-27 2025-09-30 13F/A-1 SIMPSON MFG COM 829073105 1,531,426 -46,221 -2.93 256,453 4.66 0.0155
2025-11-14 2025-09-30 13F SIMPSON MFG COM 829073105 1,531,426 -46,221 256,453 0.0155
2025-08-15 2025-06-30 13F SIMPSON MFG COM 829073105 1,577,647 142,390 9.92 245,025 8.68 0.0160
2025-05-15 2025-03-31 13F SIMPSON MFG COM 829073105 1,435,257 85,164 6.31 225,450 0.70 0.0161
2025-05-15 2024-12-31 13F/A-1 SIMPSON MFG COM 829073105 1,350,093 40,340 3.08 223,886 -10.63 0.0157
2025-02-14 2024-12-31 13F SIMPSON MFG COM 829073105 1,350,093 40,340 223,886 0.0157
2025-05-14 2024-09-30 13F/A-2 SIMPSON MFG COM 829073105 1,309,753 -14,586 -1.10 250,517 12.24 0.0182
2025-02-14 2024-09-30 13F/A-1 SIMPSON MFG COM 829073105 1,309,753 -14,586 250,517 0.0182
2024-11-14 2024-09-30 13F SIMPSON MFG COM 829073105 1,309,753 -14,586 250,517 0.0182
2025-05-14 2024-06-30 13F/A-2 SIMPSON MFG COM 829073105 1,324,339 934,989 240.14 223,191 179.39 0.0173
2024-10-17 2024-06-30 13F/A-1 SIMPSON MFG COM 829073105 1,324,339 934,989 223,191 0.0173
2024-08-14 2024-06-30 13F SIMPSON MFG COM 829073105 1,324,339 934,989 223,191 0.0173
2024-10-17 2024-03-31 13F/A-2 SIMPSON MFG COM 829073105 389,350 -220,111 -36.12 79,887 -33.79 0.0064
2024-08-16 2024-03-31 13F/A-1 SIMPSON MFG COM 829073105 389,350 -220,111 79,887 0.0008
2024-05-15 2024-03-31 13F SIMPSON MFG COM 829073105 389,350 -220,111 79,887 0.0064
2024-08-16 2023-12-31 13F/A-1 SIMPSON MFG COM 829073105 609,461 65,677 12.08 120,661 48.12 0.0106
2024-02-13 2023-12-31 13F SIMPSON MFG COM 829073105 609,461 65,677 120,661 0.0106
2023-11-15 2023-09-30 13F SIMPSON MFG COM 829073105 543,784 -18,837 -3.35 81,464 4.54 0.0083
2023-08-14 2023-06-30 13F SIMPSON MFG COM 829073105 562,621 28,160 5.27 77,923 32.98 0.0077
2023-05-15 2023-03-31 13F SIMPSON MFG COM 829073105 534,461 16,561 3.20 58,598 27.62 0.0063
2023-02-14 2022-12-31 13F SIMPSON MFG COM 829073105 517,900 368,325 246.25 45,917 291.55 0.0052
2022-11-14 2022-09-30 13F SIMPSON MFG COM 829073105 149,575 -51,646 -25.67 11,727 -42.08 0.0016
2022-10-27 2022-06-30 13F/A-1 SIMPSON MFG COM 829073105 201,221 87,520 76.97 20,246 63.30 0.0026
2022-08-15 2022-06-30 13F SIMPSON MFG COM 829073105 201,221 87,520 20,246 0.0026
2022-10-27 2022-03-31 13F/A-1 SIMPSON MFG COM 829073105 113,701 -40,814 -26.41 12,398 -42.30 0.0017
2022-05-13 2022-03-31 13F SIMPSON MFG COM 829073105 113,701 -40,814 12,398 0.0017
2022-02-14 2021-12-31 13F SIMPSON MFG COM 829073105 154,515 -16,298 -9.54 21,488 17.60 0.0027
2021-11-15 2021-09-30 13F SIMPSON MFG COM 829073105 170,813 -47,673 -21.82 18,272 -24.27 0.0025
2021-08-23 2021-06-30 13F/A-1 SIMPSON MFG COM 829073105 218,486 -5,178 -2.32 24,129 4.00 0.0032
2021-08-16 2021-06-30 13F SIMPSON MFG COM 829073105 218,486 -5,178 24,129 0.0007
2021-05-17 2021-03-31 13F SIMPSON MFG COM 829073105 223,664 -50,032 -18.28 23,200 -9.30 0.0034
2021-02-16 2020-12-31 13F SIMPSON MANUFACTURING COM 829073105 273,696 77,984 39.85 25,578 34.51 0.0040
2020-11-13 2020-09-30 13F SIMPSON MANUFACTURING COM 829073105 195,712 62,362 46.77 19,015 69.04 0.0037
2020-08-14 2020-06-30 13F SIMPSON MANUFACTURING COM 829073105 133,350 -8,766 -6.17 11,249 27.70 0.0025
2020-05-26 2020-03-31 13F/A-1 SIMPSON MANUFACTURING COM 829073105 142,116 -153,139 -51.87 8,809 -62.81 0.0024
2020-05-15 2020-03-31 13F SIMPSON MANUFACTURING COM 829073105 142,116 -153,139 8,809 676.7148
2020-02-14 2019-12-31 13F SIMPSON MANUFACTURING COM 829073105 295,255 136,365 85.82 23,688 114.92 0.0055
2019-11-14 2019-09-30 13F SIMPSON MANUFACTURING COM 829073105 158,890 -27,006 -14.53 11,022 -10.79 0.0029
2019-08-14 2019-06-30 13F SIMPSON MANUFACTURING COM 829073105 185,896 61,135 49.00 12,355 67.07 0.0033
2019-05-15 2019-03-31 13F SIMPSON MANUFACTURING COM 829073105 124,761 -167,079 -57.25 7,395 -53.19 0.0021
2019-02-14 2018-12-31 13F SIMPSON MANUFACTURING COM 829073105 291,840 35,874 14.02 15,797 -14.83 0.0047
2019-04-23 2018-09-30 13F/A-2 SIMPSON MANUFACTURING COM 829073105 255,966 27,535 12.05 18,547 30.55 0.0046
2018-11-20 2018-09-30 13F/A-1 SIMPSON MANUFACTURING COM 829073105 255,966 0 18,547 0.0046
2018-11-14 2018-09-30 13F SIMPSON MANUFACTURING COM 829073105 255,966 27,535 18,547
2019-04-23 2018-06-30 13F/A-1 SIMPSON MANUFACTURING COM 829073105 228,431 66,728 41.27 14,207 52.55 0.0038
2018-08-14 2018-06-30 13F SIMPSON MANUFACTURING COM 829073105 228,431 66,728 14,207
2019-04-23 2018-03-31 13F/A-1 SIMPSON MANUFACTURING COM 829073105 161,703 5,226 3.34 9,313 3.67 0.0026
2018-05-14 2018-03-31 13F SIMPSON MANUFACTURING COM 829073105 161,703 5,226 9,313
2019-04-23 2017-12-31 13F/A-1 SIMPSON MANUFACTURING COM 829073105 156,477 -30,790 -16.44 8,983 -2.19 0.0025
2018-02-14 2017-12-31 13F SIMPSON MANUFACTURING COM 829073105 156,477 -30,790 8,983
2017-11-14 2017-09-30 13F SIMPSON MANUFACTURING COM 829073105 187,267 104,989 127.60 9,184 155.32 0.0028
2017-08-11 2017-06-30 13F SIMPSON MANUFACTURING COM 829073105 82,278 -196,634 -70.50 3,597 -70.07 0.0011
2017-05-22 2017-03-31 13F/A-1 SIMPSON MANUFACTURING COM 829073105 278,912 133,300 91.54 12,019 88.68 0.0037
2017-05-12 2017-03-31 13F SIMPSON MANUFACTURING COM 829073105 278,912 12,019
2017-02-22 2016-12-31 13F/A-1 SIMPSON MANUFACTURING COM 829073105 145,612 131,942 965.19 6,370 959.90 0.0021
2017-02-13 2016-12-31 13F SIMPSON MANUFACTURING COM 829073105 145,612 6,370
2016-11-10 2016-09-30 13F SIMPSON MANUFACTURING COM 829073105 13,670 -35,693 -72.31 601 -69.52 0.0002
2016-08-12 2016-06-30 13F SIMPSON MANUFACTURING COM 829073105 49,363 30,337 159.45 1,972 171.63 0.0007
2016-05-12 2016-03-31 13F SIMPSON MANUFACTURING COM 829073105 19,026 -18,199 -48.89 726 -42.88 0.0003
2016-02-09 2015-12-31 13F SIMPSON MANUFACTURING COM 829073105 37,225 19,005 104.31 1,271 108.36 0.0005
2016-02-08 2015-09-30 13F/A-1 SIMPSON MANUFACTURING COM 829073105 18,220 -1,678 -8.43 610 -9.90 0.0002
2015-11-09 2015-09-30 13F SIMPSON MANUFACTURING COM 829073105 18,220 610
2015-08-12 2015-06-30 13F SIMPSON MANUFACTURING COM 829073105 19,898 -11,023 -35.65 677 -41.39 0.0002
2015-05-14 2015-03-31 13F SIMPSON MANUFACTURING COM 829073105 30,921 -24,684 -44.39 1,155 -40.00 0.0004
2015-02-13 2014-12-31 13F SIMPSON MANUFACTURING COM 829073105 55,605 14,909 36.64 1,925 62.17 0.0007
2014-12-16 2014-09-30 13F/A-1 SIMPSON MANUFACTURING COM 829073105 40,696 3,230 8.62 1,187 -10.42 0.0005
2014-11-14 2014-09-30 13F SIMPSON MANUFACTURING COM 829073105 40,696 1,187
2014-05-13 2014-03-31 13F SIMPSON MANUFACTURING COM 829073105 37,466 -18,432 -32.97 1,325 -35.49 0.0006
2014-02-13 2013-12-31 13F SIMPSON MANUFACTURING COM 829073105 55,898 30,063 116.37 2,054 143.94 0.0009
2013-11-13 2013-09-30 13F SIMPSON MANUFACTURING INC C COM 829073105 25,835 -27,629 -51.68 842 -46.47 0.0004
2013-08-08 2013-06-30 13F SIMPSON MANUFACTURING INC C COM 829073105 53,464 53,464 1,573 0.0008
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.