As of November 6, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of SS&C Technologies Holdings Inc. The largest reported stake is William C. Stone's, at 14.3%. 11 filings are on record since August 14, 2025 (Schedule 13G/A, February 9, 2026).
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Key facts
- · Reporting person: Pzena Investment Management LLC · Sole voting: 10,793,757 · Shared voting: 0 · Sole dispositive: 13,239,900 · Shared dispositive: 0 · SCHEDULE 13G, 2026-10-19
- · Reporting person: Fmr LLC · Sole voting: 10,251,573 · Shared voting: 0 · Sole dispositive: 12,049,021 · Shared dispositive: 0 · SCHEDULE 13G, 2026-08-06
- · Reporting person: Vanguard Portfolio Management · Sole voting: 64,787 · Shared voting: 0 · Sole dispositive: 12,236,152 · Shared dispositive: 0 · SCHEDULE 13G, 2026-07-31
- · Reporting person: BlackRock, Inc. · Sole voting: 10,774,756 · Shared voting: 0 · Sole dispositive: 12,048,983 · Shared dispositive: 0 · SCHEDULE 13G, 2026-07-30
- · Holder: Janus Henderson Group Plc · Percent: 3.5% · SCHEDULE 13G/A
SS&C Technologies Holdings Inc has 11 Schedule 13D or 13G filings on record since 2025-08-14. 5 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 |
|---|---|---|---|---|
| 14.3% | 35,202,277 | SCHEDULE 13G/A, 2026-02-09 | 2025-12-31 | |
| Pzena Investment Management LLC | 5.6% | 13,239,900 | SCHEDULE 13G, 2026-10-19 | 2026-09-30 |
| Vanguard Portfolio Management | 5.08% | 12,236,152 | SCHEDULE 13G, 2026-07-31 | 2026-06-30 |
| BlackRock, Inc. | 5% | 12,048,983 | SCHEDULE 13G, 2026-07-30 | 2026-06-30 |
| Fmr LLC | 5% | 12,049,021 | SCHEDULE 13G, 2026-08-06 | 2026-06-30 |
| BlackRock Portfolio Management LLC | 3.7% | 8,813,929 | SCHEDULE 13G/A, 2026-04-30 | 2026-03-31 |
| Janus Henderson Group Plc | 3.5% | 8,425,246 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on SS&C Technologies Holdings Inc and the records around it.
SS&C Technologies Holdings Inc elsewhere on the record
- Acquisition Oct 2025
- Who owns it
Companies that share a holder
- PZENA INVESTMENT MANAGEMENT LLC also filed stake reports on 37 other companies: ADVANCE AUTO PARTS INC (Oct 2026), Globant S.A. (Oct 2026), Koppers Holdings Inc. (Oct 2026)
- JANUS HENDERSON GROUP PLC also filed stake reports on 104 other companies: SURGERY PARTNERS, INC. (Nov 2026), EYEPOINT, INC. (Sep 2026), TELEFLEX INCORPORATED (Sep 2026)
- BlackRock Portfolio Management LLC also filed stake reports on 118 other companies: AMERISAFE INC (Nov 2026), BlackRock ETF Trust (Nov 2026), iShares J.P. Morgan EM Local Currency Bond ETF (Nov 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Pzena Investment Management LLC | 10,793,757 | 0 | 13,239,900 | 0 | SCHEDULE 13G, 2026-10-19 |
| Vanguard Portfolio Management | 64,787 | 0 | 12,236,152 | 0 | SCHEDULE 13G, 2026-07-31 |
| BlackRock, Inc. | 10,774,756 | 0 | 12,048,983 | 0 | SCHEDULE 13G, 2026-07-30 |
| Fmr LLC | 10,251,573 | 0 | 12,049,021 | 0 | SCHEDULE 13G, 2026-08-06 |
| Abigail P. Johnson | 0 | 0 | 12,049,021 | 0 | SCHEDULE 13G, 2026-08-06 |
The latest filing identifies SS&C Technologies Holdings Inc by CUSIP 78467J100 and gives its principal executive office as 80 LAMBERTON RD, WINDSOR, CT 06095 (SCHEDULE 13G, 2026-10-19).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-14 | Janus Henderson Group Plc | 6.7% | SCHEDULE 13G/A |
| 2025-11-14 | Janus Henderson Group Plc | 6.8% | SCHEDULE 13G/A |
| 2026-02-09 | William C. Stone | 14.3% | SCHEDULE 13G/A |
| 2026-02-17 | Janus Henderson Group Plc | 5.7% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-30 | BlackRock Portfolio Management LLC | 3.7% | SCHEDULE 13G/A |
| 2026-05-15 | Janus Henderson Group Plc | 3.5% | SCHEDULE 13G/A |
| 2026-07-30 | BlackRock, Inc. | 5% | SCHEDULE 13G |
| 2026-07-31 | Vanguard Portfolio Management | 5.08% | SCHEDULE 13G |
| 2026-08-06 | Fmr LLC | 5% | SCHEDULE 13G |
| 2026-10-19 | Pzena Investment Management LLC | 5.6% | SCHEDULE 13G |
Questions about who owns SS&C Technologies Holdings Inc
Who owns SS&C Technologies Holdings Inc?
On this page, 5 holders' latest ownership filings report 5% or more of SS&C Technologies Holdings Inc: William C. Stone (14.3%, Schedule 13G/A, filed 2026-02-09), Pzena Investment Management LLC (5.6%, Schedule 13G, filed 2026-10-19), Vanguard Portfolio Management (5.08%, Schedule 13G, filed 2026-07-31), BlackRock, Inc. (5%, Schedule 13G, filed 2026-07-30) and Fmr LLC (5%, Schedule 13G, filed 2026-08-06).
Who are the largest shareholders of SS&C Technologies Holdings Inc?
By the share each holder's latest filing reports, the largest holders of SS&C Technologies Holdings Inc on this page are William C. Stone (14.3%), Pzena Investment Management LLC (5.6%) and Vanguard Portfolio Management (5.08%).
When did William C. Stone buy into SS&C Technologies Holdings Inc?
The filings give report dates, not purchase dates. The earliest filing from William C. Stone on this page is the Schedule 13G/A, filed 2026-02-09, reporting 14.3%. 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%); 11 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.
Also on the record for SS&C Technologies Holdings Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| October 14, 2025 | Acquired Colossus Topco Limited | — | Acquisition | Source |
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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.