The merger with Zymeworks Inc. has closed, and the activist has exited. Monitor post-merger integration and any potential dissenting shareholder appraisal rights or litigation, though none are indicated in this filing.
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Executive Summary
Weiss Asset Management LP filed a Schedule 13D/A reporting that its stake in Theravance Biopharma was reduced to 0% as of September 23, 2026, when the company's shares were cancelled upon completion of the merger with Zymeworks Inc. This amendment confirms the activist's exit following the merger close, marking the end of the campaign.
Key Financial Metrics
Key Facts
- Weiss Asset Management LP's beneficial ownership in Theravance Biopharma was reduced to 0.0% as of September 23, 2026.
- The shares were cancelled in connection with the completion of the merger with Zymeworks Inc. on September 23, 2026.
- No transactions in the issuer's shares were effected by the reporting persons during the past 60 days.
- This is Amendment No. 4 to the Schedule 13D initially filed on April 12, 2023.
Financial Impact
Weiss Asset Management's stake was reduced to zero upon merger close; no financial consideration disclosed in this filing.
Risk Factors
- No ongoing activist pressure post-merger; future value depends on Zymeworks' execution.
- Potential shareholder litigation over merger terms is not mentioned but could emerge separately.
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13D/A Filing (Primary) | 0001193125-26-402801 |
| Document: 0001193125-26-402801-index.html | 0001193125-26-402801 |
| Document: 0001193125-26-402801.txt | 0001193125-26-402801 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 5, 2026 22d ago | 15-12G | — | awaiting T+20 | — | — |
Sep 25, 2026 4w ago | SC 13D/A | $17.04 | awaiting T+20 | — | — |
Sep 23, 2026 4w ago | 25-NSE | $17.05 | awaiting T+20 | — | — |
Aug 25, 2026 9w ago | DEFA14A | $17.03 $17.03 | · 0.00% | ▼ −0.23% | — |
Aug 21, 2026 9w ago | DEFM14A | $17.01 $17.05 | ▲ +0.24% | ▲ +0.76% | — |
Aug 11, 2026 11w ago | PREM14A | $16.91 $17.06 | ▲ +0.89% | ▲ +1.95% | — |
Aug 10, 2026 11w ago | 8-K | $16.91 $17.06 | ▲ +0.89% | ▲ +1.80% | — |
Jun 29, 2026 17w ago | 8-K | $17.06 $16.86 | ▼ −1.17% | ▼ −0.89% | — |
Jun 23, 2026 18w ago | 8-K | $17.27 $16.81 | ▼ −2.66% | ▼ −4.60% | — |
May 7, 2026 24w ago | 8-K | $17.02 $15.92 | ▼ −6.46% | ▼ −9.60% | — |
US Market Status
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