As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Simpson Manufacturing Co. The largest reported stake is Kayne Anderson Rudnick Investment Management, LLC's, at 8.7%. 8 filings are on record since November 5, 2025 (Schedule 13G/A, August 13, 2026).
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Key facts
- · Reporting person: Fmr LLC · Sole voting: 2,941,715 · Shared voting: 0 · Sole dispositive: 2,955,885 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-11-05
- · Reporting person: Kayne Anderson Rudnick Investment Management, LLC · Sole voting: 2,465,845 · Shared voting: 671,417 · Sole dispositive: 2,897,074 · Shared dispositive: 671,417 · SCHEDULE 13G/A, 2026-08-13
- · Holder: Fmr LLC · Percent: 8.9% · SCHEDULE 13G/A
- · Holder: Fmr LLC · Percent: 6.4% · SCHEDULE 13G/A
- · Reporting person: Vanguard Capital Management · Sole voting: 318,186 · Shared voting: 0 · Sole dispositive: 2,182,233 · Shared dispositive: 0 · SCHEDULE 13G, 2026-04-30
Simpson Manufacturing Co has 8 Schedule 13D or 13G filings on record since 2025-11-05. 3 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Kayne Anderson Rudnick Investment Management, LLC | 8.7% | 3,568,491 | SCHEDULE 13G/A, 2026-08-13 | 2026-06-30 |
| Fmr LLC | 7.2% | 2,955,885 | SCHEDULE 13G/A, 2026-11-05 | 2026-09-30 |
| Vanguard Capital Management | 5.29% | 2,182,233 | SCHEDULE 13G, 2026-04-30 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on Simpson Manufacturing Co and the records around it.
Simpson Manufacturing Co elsewhere on the record
Companies that share a holder
- Kayne Anderson Rudnick Investment Management, LLC also filed stake reports on 53 other companies: Andersen Group Inc. (Aug 2026), Bright Horizons Family Solutions Inc (Aug 2026), Choice Hotels International Inc (Aug 2026)
- FMR LLC also filed stake reports on 761 other companies: ASPEN NEUROSCIENCE INC (Nov 2026), AVALO THERAPEUTICS INC (Nov 2026), BRAZE INC (Nov 2026)
- Vanguard Capital Management also filed stake reports on 1495 other companies: A10 Networks Inc (Oct 2026), Altisource Portfolio Solutions SA (Oct 2026), Alto Neuroscience Inc (Oct 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Kayne Anderson Rudnick Investment Management, LLC | 2,465,845 | 671,417 | 2,897,074 | 671,417 | SCHEDULE 13G/A, 2026-08-13 |
| Fmr LLC | 2,941,715 | 0 | 2,955,885 | 0 | SCHEDULE 13G/A, 2026-11-05 |
| Abigail P. Johnson | 0 | 0 | 2,955,885 | 0 | SCHEDULE 13G/A, 2026-11-05 |
| Vanguard Capital Management | 318,186 | 0 | 2,182,233 | 0 | SCHEDULE 13G, 2026-04-30 |
The latest filing identifies Simpson Manufacturing Co by CUSIP 829073105 and gives its principal executive office as 5956 W LAS POSITAS BLVD, PLEASANTON, CA 94588 (SCHEDULE 13G/A, 2026-11-05).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-11-05 | Fmr LLC | 5.1% | SCHEDULE 13G |
| 2026-02-13 | Kayne Anderson Rudnick Investment Management, LLC | 9.7% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-30 | Vanguard Capital Management | 5.29% | SCHEDULE 13G |
| 2026-05-06 | Fmr LLC | 6.4% | SCHEDULE 13G/A |
| 2026-08-06 | Fmr LLC | 8.9% | SCHEDULE 13G/A |
| 2026-08-13 | Kayne Anderson Rudnick Investment Management, LLC | 8.7% | SCHEDULE 13G/A |
| 2026-11-05 | Fmr LLC | 7.2% | SCHEDULE 13G/A |
Questions about who owns Simpson Manufacturing Co
Who owns Simpson Manufacturing Co?
On this page, 3 holders' latest ownership filings report 5% or more of Simpson Manufacturing Co: Kayne Anderson Rudnick Investment Management, LLC (8.7%, Schedule 13G/A, filed 2026-08-13), Fmr LLC (7.2%, Schedule 13G/A, filed 2026-11-05) and Vanguard Capital Management (5.29%, Schedule 13G, filed 2026-04-30).
Who are the largest shareholders of Simpson Manufacturing Co?
By the share each holder's latest filing reports, the largest holders of Simpson Manufacturing Co on this page are Kayne Anderson Rudnick Investment Management, LLC (8.7%), Fmr LLC (7.2%) and Vanguard Capital Management (5.29%).
When did Kayne Anderson Rudnick Investment Management, LLC buy into Simpson Manufacturing Co?
The filings give report dates, not purchase dates. The earliest filing from Kayne Anderson Rudnick Investment Management, LLC on this page is the Schedule 13G/A, filed 2026-02-13, reporting 9.7%; its latest, Schedule 13G/A filed 2026-08-13, reports 8.7%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 8 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.