As of November 7, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of SANUWAVE Health, Inc. The largest reported stake is Manchester Management Company, LLC's, at 10.8%. 10 filings are on record since July 29, 2025 (Schedule 13D/A, December 15, 2025).
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Key facts
- · Reporting person: Solas Capital Management, LLC · Sole voting: 0 · Shared voting: 610,968 · Sole dispositive: 0 · Shared dispositive: 610,968 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Opaleye Management Inc. · Sole voting: 0 · Shared voting: 309,948 · Sole dispositive: 0 · Shared dispositive: 309,948 · SCHEDULE 13G/A, 2026-07-31
- · Reporting person: BlackRock, Inc. · Sole voting: 132,058 · Shared voting: 0 · Sole dispositive: 132,058 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-07-30
- · Holder: Opaleye Management Inc. · Percent: 9.99% · SCHEDULE 13G/A
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
SANUWAVE Health, Inc. has 10 Schedule 13D or 13G filings on record since 2025-07-29. 2 holders' latest filing reports 5% or more of common stock, par value $0.001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Manchester Management Company, LLC | 10.8% | 927,979 | SCHEDULE 13D/A, 2025-12-15 | 2025-12-11 |
| Solas Capital Management, LLC | 7.1% | 610,968 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Opaleye Management Inc. | 3.6% | 309,948 | SCHEDULE 13G/A, 2026-07-31 | 2026-06-30 |
| BlackRock, Inc. | 1.5% | 132,058 | SCHEDULE 13G/A, 2026-07-30 | 2026-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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Keep reading
More on SANUWAVE Health, Inc. and the records around it.
SANUWAVE Health, Inc. elsewhere on the record
Companies that share a holder
- MANCHESTER MANAGEMENT CO LLC also filed stake reports on 2 other companies: Alpha Cognition Inc. (Sep 2026), EUPRAXIA PHARMACEUTICALS INC. (Aug 2026)
- Solas Capital Management, LLC also filed stake reports on 5 other companies: FENNEC PHARMACEUTICALS INC. (Aug 2026), MAIA Biotechnology, Inc. (Aug 2026), Modular Medical, Inc. (Aug 2026)
- Opaleye Management Inc. also filed stake reports on 12 other companies: Codexis, Inc. (Nov 2026), Gossamer Bio, Inc. (Nov 2026), Pasithea Therapeutics Corp. (Nov 2026)
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What the Full Report on SANUWAVE Health, Inc. covers
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Solas Capital Management, LLC | 0 | 610,968 | 0 | 610,968 | SCHEDULE 13G/A, 2026-08-14 |
| Frederick Tucker Golden | 0 | 610,968 | 0 | 610,968 | SCHEDULE 13G/A, 2026-08-14 |
| Opaleye Management Inc. | 0 | 309,948 | 0 | 309,948 | SCHEDULE 13G/A, 2026-07-31 |
| Opaleye, L.P. | 0 | 309,948 | 0 | 309,948 | SCHEDULE 13G/A, 2026-07-31 |
| James Silverman | 0 | 309,948 | 0 | 309,948 | SCHEDULE 13G/A, 2026-07-31 |
| BlackRock, Inc. | 132,058 | 0 | 132,058 | 0 | SCHEDULE 13G/A, 2026-07-30 |
The latest filing identifies SANUWAVE Health, Inc. by CUSIP 80303D305 and gives its principal executive office as 9600 W. 76th Street, Suite 118, Eden Prairie, MN 55344 (SCHEDULE 13G/A, 2026-08-14).
Purpose of Transaction (Item 4)
Manchester Management Company, LLC
There are no material changes to Item 4 of the Schedule 13D amendment, submitted on October 22, 2024. The Reporting Persons have acquired their Shares of the Issuer for investment. The Reporting Persons have no plans or proposals as of the date of this filing which, other than as expressly set forth below, would relate to or would result in: (a) any extraordinary corporate transaction involving the Issuer; (b) any change in the present Board of Directors or management of the Issuer; (c) any material change in the present capitalization or dividend policy of the Issuer; (d) any material change in the operating policies or corporate structure of the Issuer; (e) any change in the Issuer's charter or by-laws; (f) the Shares of the Issuer ceasing to be listed from a national securities exchange or to ceasing to be authorized to be quoted in an inter-dealer quotation system of a registered national securities association; or (g) causing the Issuer becoming eligible for termination of registration pursuant to Section 12(g)(4) of the Securities Exchange Act of 1934. The Reporting Persons, however, reserve the right, at a later date, to effect one or more of such changes and may dispose of or enter into other transactions in the shares they may be deemed to beneficially own. The Reporting Persons have been and may continue to be in contact with members of the Issuer's management, the Issuer's Board of Directors, other significant shareholders and others regarding alternatives that …The first part of Item 4 of the SCHEDULE 13D/A filed 2025-12-15; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-29 | The Vanguard Group | 5.19% | SCHEDULE 13G |
| 2025-08-14 | Solas Capital Management, LLC | 3.5% | SCHEDULE 13G/A |
| 2025-10-17 | BlackRock, Inc. | 5.6% | SCHEDULE 13G |
| 2025-12-10 | Manchester Management Co LLC | 11.1% | SCHEDULE 13D/A |
| 2025-12-15 | Manchester Management Company, LLC | 10.8% | SCHEDULE 13D/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-05-04 | Opaleye Management Inc. | 9.99% | SCHEDULE 13G/A |
| 2026-07-30 | BlackRock, Inc. | 1.5% | SCHEDULE 13G/A |
| 2026-07-31 | Opaleye Management Inc. | 3.6% | SCHEDULE 13G/A |
| 2026-08-14 | Solas Capital Management, LLC | 7.1% | SCHEDULE 13G/A |
Questions about who owns SANUWAVE Health, Inc.
Who owns SANUWAVE Health, Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of SANUWAVE Health, Inc.: Manchester Management Company, LLC (10.8%, Schedule 13D/A, filed 2025-12-15) and Solas Capital Management, LLC (7.1%, Schedule 13G/A, filed 2026-08-14).
Who are the largest shareholders of SANUWAVE Health, Inc.?
By the share each holder's latest filing reports, the largest holders of SANUWAVE Health, Inc. on this page are Manchester Management Company, LLC (10.8%) and Solas Capital Management, LLC (7.1%).
When did Manchester Management Company, LLC buy into SANUWAVE Health, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Manchester Management Company, LLC on this page is the Schedule 13D/A, filed 2025-12-15, reporting 10.8%. 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%); 10 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.