Comparable stake leader
FMR LLC
SEC ownership of Simpson Manufacturing Co., Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000920371.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
18 Aug 2026
- Public ticker
- SSD on NYSE
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
FMR LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
FMR LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
18 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000920371
- Issuer location
- Pleasanton, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Simpson Manufacturing Co., Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
FMR LLC
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
18 Aug 2026
13F
13D/G
3/4/5
Lead comparable stake: 8.9%
13D/G row: FMR LLC
Showing 1-8 of 50 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 8.9%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens FMR LLC's linked filing trail.
Comparable ownership
Top 5
FMR LLC
8.9%
KAYNE ANDERSON RUDNICK INVESTMENT...
8.7%
VANGUARD CAPITAL MANAGEMENT LLC
5.3%
Michael Olosky
0.13%
Celeste Volz Ford
0.03%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| FMR LLC |
13F
13D/G
Company
|
8.9%
from 13D/G
|
$768,219,755
3,669,547 shares
|
— | 30 Jun 2026 |
| KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC |
13F
13D/G
Company
|
8.7%
from 13D/G
|
$746,971,245
3,568,049 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.3%
|
$416,981,082
2,182,233 shares
|
$0 | 31 Mar 2026 |
| Michael Olosky |
3/4/5
President and CEO, Director
|
0.13%
|
$11,473,812
54,896 shares
|
— | 17 Feb 2026 |
| Celeste Volz Ford |
3/4/5
Director
|
0.03%
|
$2,421,901
14,112 shares
|
— | 06 May 2026 |
| Michael Andersen |
3/4/5
EVP, Europe
|
0.03%
|
$2,223,139
12,417 shares
|
— | 17 Feb 2026 |
| Jeremy Gilstrap |
3/4/5
EVP, Innovation
|
0.03%
|
$2,502,904
12,155 shares
|
— | 17 Feb 2026 |
| Phillip Burton |
3/4/5
EVP, North America
|
0.02%
|
$2,070,662
9,907 shares
|
— | 17 Feb 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$657,876.
Buys
$0
Insiders: 0
Sells
$657,876
Insiders: 2
Net
-$657,876
Shares: -3,775
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 3,775
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 800 | $0 | $156,496 | -$156,496 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 2,375 | $0 | $399,380 | -$399,380 |
| 9-12 | 0 | 600 | $0 | $102,000 | -$102,000 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 23 reporting-owner rows connected to Simpson Manufacturing Co., Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
23
Largest Forms 3/4/5 holder
Michael Olosky
Net 12M change
-$657,876
Latest report
18 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Michael Olosky | President and CEO, Director | $11,473,812 | Mixed | 17 Feb 2026 | ||
| Karen Winifred Colonias | Director | $9,589,395 | Mixed | 25 Apr 2023 | ||
| Brian J. Magstadt | Chief Financial Officer | $5,999,716 | Mixed | 15 Feb 2024 | ||
| Gary M. Cusumano | Director | $4,697,269 | Mixed | 01 May 2024 | ||
| Roger Dankel | EVP, NA Sales | $4,062,468 | Mixed | 10 Dec 2024 | ||
| Jennifer Chatman | Director | $2,817,522 | Filing P/S | 12 Feb 2024 | ||
| Greenway Robin Macgillivray | Director | $2,596,104 | Mixed | 26 Apr 2023 | ||
| Jeremy Gilstrap | EVP, Innovation | $2,502,904 | Mixed | 17 Feb 2026 | ||
| Celeste Volz Ford | Director | $2,421,901 | Mixed | 06 May 2026 | ||
| Michael Andersen | EVP, Europe | $2,223,139 | Mixed | 17 Feb 2026 | ||
| Phillip Burton | EVP, North America | $2,070,662 | Mixed | 17 Feb 2026 | ||
| Kevin Lee Swartzendruber | Senior VP of Finance | $1,372,018 | Mixed | 15 Feb 2024 | ||
| Philip E. Donaldson | Director | $1,203,914 | -$399,380 | -25% | Mixed | 06 May 2026 |
| James S. Andrasick | Director | $1,193,712 | -$258,496 | -18% | Mixed | 04 Aug 2026 |
| Udit Mehta | Chief Technology Officer | $1,042,959 | Mixed | 17 Feb 2026 | ||
| Cassandra Payton | EVP, General Counsel | $979,838 | Mixed | 17 Feb 2026 | ||
| Matt Dunn | Chief Financial Officer | $979,629 | Mixed | 17 Feb 2026 | ||
| Kenneth D. Knight | Director | $819,485 | Mixed | 06 May 2026 | ||
| Jennifer Lutz | EVP, Human Resources | $625,059 | Filing P/S | 01 May 2025 | ||
| Felica Coney | Director | $518,120 | Mixed | 06 May 2026 |
Recent insider transactions for Simpson Manufacturing Co., Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Nozomi Bullock | SSD | Common Stock | Discretionary transaction in accordance with Rule 16b-3(f) resulting in acquisition or disposition of issuer securities | -100% | -21.81 | 0 | 18 Aug 2026 | By Trust (PSP) | ||
| James S. Andrasick | SSD | Common Stock | Sale | -92.9% | $156,496 | $195.62 | -800 | 61 | 04 Aug 2026 | Direct |
| Kenneth D. Knight | SSD | Common Stock | Award | 16.6% | 678 | 4,775 | 06 May 2026 | Direct | ||
| Celeste Volz Ford | SSD | Common Stock | Award | 5.05% | 678 | 14,112 | 06 May 2026 | Direct | ||
| Angela C. Drake | SSD | Common Stock | Award | 66.9% | 678 | 1,691 | 06 May 2026 | Direct | ||
| Philip E. Donaldson | SSD | Common Stock | Award | 15.3% | 929 | 7,015 | 06 May 2026 | Direct | ||
| Felica Coney | SSD | Common Stock | Award | 29% | 678 | 3,019 | 06 May 2026 | Direct | ||
| Chau Banks | SSD | Common Stock | Award | 29% | 678 | 3,019 | 06 May 2026 | Direct | ||
| James S. Andrasick | SSD | Common Stock | Award | 370.5% | 678 | 861 | 06 May 2026 | Direct | ||
| Cassandra Payton | SSD | Common Stock | Tax liability | -13.8% | -749 | 4,688 | 17 Feb 2026 | Direct | ||
| Cassandra Payton | SSD | Common Stock | Award | 21.5% | 963 | 5,437 | 17 Feb 2026 | Direct | ||
| Udit Mehta | SSD | Common Stock | Tax liability | -7.18% | -386 | 4,990 | 17 Feb 2026 | Direct | ||
| Jeremy Gilstrap | SSD | Common Stock | Tax liability | -3.69% | -418 | 10,900 | 17 Feb 2026 | Direct | ||
| Jeremy Gilstrap | SSD | Common Stock | Award | 27.6% | 2,449 | 11,318 | 17 Feb 2026 | Direct | ||
| Matt Dunn | SSD | Common Stock | Tax liability | -3.8% | -185 | 4,687 | 17 Feb 2026 | Direct | ||
| Phillip Burton | SSD | Common Stock | Tax liability | -3.36% | -344 | 9,907 | 17 Feb 2026 | Direct | ||
| Phillip Burton | SSD | Common Stock | Award | 46.4% | 3,248 | 10,251 | 17 Feb 2026 | Direct | ||
| Michael Andersen | SSD | Common Stock | Award | 41.2% | 3,624 | 12,417 | 17 Feb 2026 | Direct | ||
| Michael Olosky | SSD | Common Stock | Tax liability | -2.8% | -1,582 | 54,896 | 17 Feb 2026 | Direct | ||
| Michael Olosky | SSD | Common Stock | Award | 43.6% | 17,140 | 56,478 | 17 Feb 2026 | Direct | ||
| Nozomi Bullock | SSD | Common Stock | Award | 773 | 773 | 27 Jan 2026 | Direct | |||
| Matt Dunn | SSD | Common Stock | Award | 121% | 2,667 | 4,872 | 27 Jan 2026 | Direct | ||
| Udit Mehta | SSD | Common Stock | Award | 22% | 970 | 5,376 | 27 Jan 2026 | Direct | ||
| Cassandra Payton | SSD | Common Stock | Award | 44.6% | 1,379 | 4,474 | 27 Jan 2026 | Direct | ||
| Phillip Burton | SSD | Common Stock | Award | 27.6% | 1,515 | 7,003 | 27 Jan 2026 | Direct | ||
| Jeremy Gilstrap | SSD | Common Stock | Award | 13.8% | 1,075 | 8,869 | 27 Jan 2026 | Direct | ||
| Michael Andersen | SSD | Common Stock | Award | 12.6% | 983 | 8,793 | 27 Jan 2026 | Direct | ||
| Michael Olosky | SSD | Common Stock | Award | 31.8% | 9,480 | 39,338 | 27 Jan 2026 | Direct | ||
| Philip E. Donaldson | SSD | Common Stock | Sale | -28.1% | $399,380 | $168.16 | -2,375 | 6,086 | 12 Dec 2025 | Direct |
| James S. Andrasick | SSD | Common Stock | Sale | -76.6% | $102,000 | $170.00 | -600 | 183 | 11 Nov 2025 | Direct |
* marks a reported price that did not pass the local price check.