Expect near-term selling pressure as MPM entities execute these sales. Monitor actual Form 4 filings for completed transactions. The coordinated nature suggests a deliberate reduction in exposure, which could lead to further dilution concerns.
Price Chart
Executive Summary
Three affiliated MPM entities – MPM Asset Management LLC, MPM Oncology Innovations Fund LP, and MPM BioVentures 2014, L.P. – each filed Form 144 on May 1, 2026, indicating intent to sell shares of Werewolf Therapeutics (HOWL). The only quantifiable detail available shows MPM Asset Management LLC plans to sell 57,588 shares. This coordinated insider selling by the company's lead venture backers signals reduced conviction and could pressure the stock.
Key Facts
- Three affiliated MPM entities filed Form 144 on 2026-05-01 to sell HOWL shares.
- MPM Asset Management LLC disclosed an intent to sell 57,588 shares.
- The filings come after recent insider sales of $155K in the prior 30 days.
- HOWL has a market cap of approximately $35 million.
- The combined selling from MPM entities represents a material portion of insider holdings.
Financial Impact
Not fully quantifiable from disclosures; MPM Asset Management's disclosed portion is 57,588 shares, value estimated at approximately $41,440 based on filing data, but total across three entities likely larger.
Risk Factors
- Accelerated selling by significant insider holders may depress share price.
- Lack of confidence from venture backers could signal underlying issues not publicly disclosed.
- Potential for additional insider sales if this trend continues.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 6 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (HOWL) — Batch item 1 | 0001628280-26-029388 |
| Document: 0001628280-26-029388-index.html | 0001628280-26-029389 |
| Document: 0001628280-26-029388.txt | 0001628280-26-029390 |
| 144 Filing (HOWL) — Batch item 4 | 0001628280-26-029389 |
| Document: 0001628280-26-029389-index.html | 0001628280-26-029388 |
| 144 Filing (HOWL) — Batch item 6 | 0001628280-26-029390 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 26, 2026 today | S-4/A | $0.9806 | awaiting T+5 | — | $0.9788 (+0.18%) |
Sep 22, 2026 4w ago | S-4 | $0.9894 $0.9223 | ▲ +6.78% | ▲ +6.11% | $0.9788 (+1.07%) |
Sep 21, 2026 5w ago | SC 13G | $0.9800 $0.9300 | ▼ −5.10% | ▼ −4.08% | $0.9788 (−0.12%) |
Aug 21, 2026 9w ago | 425 | $0.8740 $0.9433 | ▲ +7.93% | ▲ +7.46% | $0.9788 (+11.99%) |
Aug 21, 2026 9w ago | 8-K | $0.8740 $0.9433 | ▲ +7.93% | ▲ +7.46% | $0.9788 (+11.99%) |
Aug 21, 2026 9w ago | Press Release | $0.8740 $0.9433 | ▼ −7.93% | ▼ −7.46% | $0.9788 (−11.99%) |
Jul 31, 2026 12w ago | 8-K | $0.3531 $0.3971 | ▲ +12.46% | ▲ +8.95% | $0.9788 (+177.20%) |
Jul 31, 2026 12w ago | Press Release | $0.3531 $0.3971 | ▲ +12.46% | ▲ +8.95% | $0.9788 (+177.20%) |
Jun 29, 2026 17w ago | 144 | $0.3599 $0.3200 | ▲ +11.09% | ▲ +11.69% | $0.9788 (−171.96%) |
Jun 29, 2026 17w ago | 144 | $0.3599 $0.3200 | ▲ +11.09% | ▲ +11.69% | $0.9788 (−171.96%) |
US Market Status
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