As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Advantage Solutions Inc. The largest reported stake is Karman Topco L.P.'s, at 52.6%. 3 filings are on record since March 26, 2026 (Schedule 13D/A, May 18, 2026).
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Key facts
- · Reporting person: CastleKnight Master Fund LP · Sole voting: 0 · Shared voting: 757,354 · Sole dispositive: 0 · Shared dispositive: 757,354 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Karman Topco L.P. · Sole voting: 6,998,347 · Shared voting: 0 · Sole dispositive: 6,998,347 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-05-18
- · Holder: CastleKnight Master Fund LP · Percent: 5.5% · SCHEDULE 13G
Advantage Solutions Inc. has 3 Schedule 13D or 13G filings on record since 2026-03-26. 2 holders' latest filing reports 5% or more of class a common stock, $0.0001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Karman Topco L.P. | 52.6% | 6,998,347 | SCHEDULE 13D/A, 2026-05-18 | 2026-05-14 |
| CastleKnight Master Fund LP | 5.9% | 757,354 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
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More on Advantage Solutions Inc. and the records around it.
Companies that share a holder
- CastleKnight Master Fund LP also filed stake reports on 17 other companies: Suja Life, Inc. (Aug 2026), HAIN CELESTIAL GROUP INC (Aug 2026), Innventure, Inc. (Aug 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Karman Topco L.P. | 6,998,347 | 0 | 6,998,347 | 0 | SCHEDULE 13D/A, 2026-05-18 |
| CastleKnight Master Fund LP | 0 | 757,354 | 0 | 757,354 | SCHEDULE 13G/A, 2026-08-14 |
| CastleKnight Fund GP LLC | 0 | 757,354 | 0 | 757,354 | SCHEDULE 13G/A, 2026-08-14 |
| CastleKnight Management LP | 0 | 757,354 | 0 | 757,354 | SCHEDULE 13G/A, 2026-08-14 |
| CastleKnight Management GP LLC | 0 | 757,354 | 0 | 757,354 | SCHEDULE 13G/A, 2026-08-14 |
| Weitman Capital LLC | 0 | 757,354 | 0 | 757,354 | SCHEDULE 13G/A, 2026-08-14 |
| Aaron Weitman | 0 | 757,354 | 0 | 757,354 | SCHEDULE 13G/A, 2026-08-14 |
The latest filing identifies Advantage Solutions Inc. by CUSIP 00791N201 and gives its principal executive office as 7676 Forsyth Boulevard, Fifth Floor, St. Louis, MO 63105 (SCHEDULE 13G/A, 2026-08-14).
Purpose of Transaction (Item 4)
Karman Topco L.P.
Item 4 of the Schedule 13D is hereby amended and supplemented as follows: Distribution On May 14, 2026, the Reporting Person distributed 190,324 shares of Common Stock to certain of the Reporting Person's limited partners in exchange for cancelling such limited partners interests held in the Reporting Person.Item 4 of the SCHEDULE 13D/A filed 2026-05-18
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-03-26 | CastleKnight Master Fund LP | 5.5% | SCHEDULE 13G |
| 2026-05-18 | Karman Topco L.P. | 52.6% | SCHEDULE 13D/A |
| 2026-08-14 | CastleKnight Master Fund LP | 5.9% | SCHEDULE 13G/A |
Questions about who owns Advantage Solutions Inc.
Who owns Advantage Solutions Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of Advantage Solutions Inc.: Karman Topco L.P. (52.6%, Schedule 13D/A, filed 2026-05-18) and CastleKnight Master Fund LP (5.9%, Schedule 13G/A, filed 2026-08-14).
Who are the largest shareholders of Advantage Solutions Inc.?
By the share each holder's latest filing reports, the largest holders of Advantage Solutions Inc. on this page are Karman Topco L.P. (52.6%) and CastleKnight Master Fund LP (5.9%).
When did Karman Topco L.P. buy into Advantage Solutions Inc.?
The filings give report dates, not purchase dates. The earliest filing from Karman Topco L.P. on this page is the Schedule 13D/A, filed 2026-05-18, reporting 52.6%. 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%); 3 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 Advantage Solutions Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| November 2, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| October 5, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | 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.