As of November 7, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Delcath Sys Inc. The largest reported stake is Rosalind Advisors, Inc.'s, at 9.9%. 7 filings are on record since October 17, 2025 (Schedule 13D/A, October 19, 2026).
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Key facts
- · Reporting person: BlackRock Portfolio Management LLC · Sole voting: 2,018,673 · Shared voting: 0 · Sole dispositive: 2,180,493 · Shared dispositive: 0 · SCHEDULE 13G, 2026-10-27
- · Reporting person: Rosalind Advisors, Inc. · Sole voting: 0 · Shared voting: 6,692,491 · Sole dispositive: 0 · Shared dispositive: 6,692,491 · SCHEDULE 13D/A, 2026-10-19
- · Reporting person: BlackRock, Inc. · Sole voting: 1,807,103 · Shared voting: 0 · Sole dispositive: 1,836,121 · Shared dispositive: 0 · SCHEDULE 13G, 2026-07-28
- · Holder: BlackRock, Inc. · Percent: 4.98% · SCHEDULE 13G/A
- · Holder: Daniel Kaufman · Percent: 5.08% · SCHEDULE 13G
Delcath Sys Inc has 7 Schedule 13D or 13G filings on record since 2025-10-17. 4 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 |
|---|---|---|---|---|
| Rosalind Advisors, Inc. | 9.9% | 6,692,491 | SCHEDULE 13D/A, 2026-10-19 | 2026-10-13 |
| BlackRock Portfolio Management LLC | 6.3% | 2,180,493 | SCHEDULE 13G, 2026-10-27 | 2026-09-30 |
| BlackRock, Inc. | 5.3% | 1,836,121 | SCHEDULE 13G, 2026-07-28 | 2026-06-30 |
| 5.08% | 1,766,432 | SCHEDULE 13G, 2026-03-20 | 2026-03-18 |
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More on Delcath Sys Inc and the records around it.
Delcath Sys Inc elsewhere on the record
Companies that share a holder
- Daniel Kaufman also filed stake reports on 6 other companies: AUNA S.A. (May 2026), ABEONA THERAPEUTICS INC. (Mar 2026), i-80 Gold Corp. (Jan 2026)
- Rosalind Advisors, Inc. also filed stake reports on 11 other companies: FEMASYS INC (Aug 2026), FENNEC PHARMACEUTICALS INC. (Aug 2026), REGENTIS BIOMATERIALS LTD. (Aug 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 |
|---|---|---|---|---|---|
| Rosalind Advisors, Inc. | 0 | 6,692,491 | 0 | 6,692,491 | SCHEDULE 13D/A, 2026-10-19 |
| Salamon Steven A J | 184,879 | 6,374,048 | 184,879 | 6,374,048 | SCHEDULE 13D/A, 2026-10-19 |
| Aharon Gil | 133,564 | 6,374,048 | 133,564 | 6,374,048 | SCHEDULE 13D/A, 2026-10-19 |
| Rosalind Master Fund L.P. | 0 | 2,871,335 | 0 | 2,871,335 | SCHEDULE 13D/A, 2026-10-19 |
| Rosalind Opportunities Fund I L.P. | 0 | 3,502,713 | 0 | 3,502,713 | SCHEDULE 13D/A, 2026-10-19 |
| BlackRock Portfolio Management LLC | 2,018,673 | 0 | 2,180,493 | 0 | SCHEDULE 13G, 2026-10-27 |
| BlackRock, Inc. | 1,807,103 | 0 | 1,836,121 | 0 | SCHEDULE 13G, 2026-07-28 |
The latest filing identifies Delcath Sys Inc by CUSIP 24661P807 and gives its principal executive office as 566 QUEENSBURY AVENUE, QUEENSBURY, NY 12804 (SCHEDULE 13G, 2026-10-27).
Purpose of Transaction (Item 4)
Rosalind Advisors, Inc.
Item 4 is hereby amended and supplemented as follows: On May 6, 2020, pursuant to the terms of the Board Appointment Agreement, the Board of Directors of the Issuer (the Board) increased the number of directors constituting the Board to eight members and elected Steven Salamon and Gilad Aharon as independent directors of the Issuer to fill the vacancies created by the increase in the number of directors. Mr. Salamon was elected to serve as a Class III director with a term scheduled to expire at the 2024 Annual Meeting of Stockholders and Dr. Aharon was elected to serve as a Class I director with a term scheduled to expire at the 2025 Annual Meeting of Stockholders.Item 4 of the SCHEDULE 13D/A filed 2026-10-19
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-10-17 | BlackRock, Inc. | 5.01% | SCHEDULE 13G |
| 2026-02-10 | Rosalind Advisors, Inc. | 9.9% | SCHEDULE 13D/A |
| 2026-03-20 | Daniel Kaufman | 5.08% | SCHEDULE 13G |
| 2026-04-27 | BlackRock, Inc. | 4.98% | SCHEDULE 13G/A |
| 2026-07-28 | BlackRock, Inc. | 5.3% | SCHEDULE 13G |
| 2026-10-19 | Rosalind Advisors, Inc. | 9.9% | SCHEDULE 13D/A |
| 2026-10-27 | BlackRock Portfolio Management LLC | 6.3% | SCHEDULE 13G |
Questions about who owns Delcath Sys Inc
Who owns Delcath Sys Inc?
On this page, 4 holders' latest ownership filings report 5% or more of Delcath Sys Inc: Rosalind Advisors, Inc. (9.9%, Schedule 13D/A, filed 2026-10-19), BlackRock Portfolio Management LLC (6.3%, Schedule 13G, filed 2026-10-27), BlackRock, Inc. (5.3%, Schedule 13G, filed 2026-07-28) and Daniel Kaufman (5.08%, Schedule 13G, filed 2026-03-20).
Who are the largest shareholders of Delcath Sys Inc?
By the share each holder's latest filing reports, the largest holders of Delcath Sys Inc on this page are Rosalind Advisors, Inc. (9.9%), BlackRock Portfolio Management LLC (6.3%) and BlackRock, Inc. (5.3%).
When did Rosalind Advisors, Inc. buy into Delcath Sys Inc?
The filings give report dates, not purchase dates. The earliest filing from Rosalind Advisors, Inc. on this page is the Schedule 13D/A, filed 2026-02-10, reporting 9.9%; its latest, Schedule 13D/A filed 2026-10-19, reports 9.9%. 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%); 7 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.