Two MPM entities filing 144s on the same day signals coordinated insider selling from a major venture backer. For a $33M micro-cap, this is a bearish signal that could pressure the stock. Monitor for actual sales on Form 4 filings. The 80% analyst bullish consensus may be at odds with insider behavior — consider the risk of further selling.
Price Chart
Executive Summary
Two affiliated MPM entities (MPM Asset Management LLC and MPM Oncology Innovations Fund LP) filed Form 144 notices on May 11, 2026, signaling intent to sell shares of Werewolf Therapeutics (HOWL). The filings come amid a $33M market cap and recent insider selling of $417K over the prior 30 days. The combined insider selling pressure from a major venture backer is notable for a micro-cap biotech.
Key Facts
- MPM Asset Management LLC filed Form 144 on 2026-05-11 to sell 13,382 shares of HOWL common stock.
- MPM Oncology Innovations Fund LP also filed Form 144 on 2026-05-11 to sell an undisclosed number of shares.
- Both filings are from MPM-affiliated entities, a major venture capital investor in Werewolf Therapeutics.
- The company has a market cap of only $33M, making any insider selling significant.
- There have been 9 insider sells totaling $417K in the prior 30 days.
- The stock has a high proportion of analyst bullishness (80% Strong Buy/Buy), contrasting with insider selling.
Financial Impact
MPM Asset Management intends to sell 13,382 shares; approximate value ~$9,100 based on recent trading. MPM Oncology Innovations Fund amount undisclosed but likely similar or larger. Combined selling could represent a material portion of daily volume for a $33M market cap stock.
Risk Factors
- Continued insider selling from major shareholders could depress stock price.
- Low liquidity ($33M market cap) amplifies impact of any selling.
- Venture backer selling may indicate lack of confidence in near-term catalysts or funding needs.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 4 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (HOWL) — Batch item 1 | 0001628280-26-033577 |
| Document: 0001628280-26-033577-index.html | 0001628280-26-033579 |
| Document: 0001628280-26-033577.txt | 0001628280-26-033577 |
| 144 Filing (HOWL) — Batch item 4 | 0001628280-26-033579 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 26, 2026 today | S-4/A | $0.9806 | awaiting T+5 | — | $1.04 (−6.06%) |
Sep 22, 2026 4w ago | S-4 | $0.9894 $0.9223 | ▲ +6.78% | ▲ +6.11% | $1.04 (−5.11%) |
Sep 21, 2026 5w ago | SC 13G | $0.9800 $0.9300 | ▼ −5.10% | ▼ −4.08% | $1.04 (+6.12%) |
Aug 21, 2026 9w ago | 425 | $0.8740 $0.9433 | ▲ +7.93% | ▲ +7.46% | $1.04 (+18.99%) |
Aug 21, 2026 9w ago | 8-K | $0.8740 $0.9433 | ▲ +7.93% | ▲ +7.46% | $1.04 (+18.99%) |
Aug 21, 2026 9w ago | Press Release | $0.8740 $0.9433 | ▼ −7.93% | ▼ −7.46% | $1.04 (−18.99%) |
Jul 31, 2026 12w ago | 8-K | $0.3531 $0.3971 | ▲ +12.46% | ▲ +8.95% | $1.04 (+194.53%) |
Jul 31, 2026 12w ago | Press Release | $0.3531 $0.3971 | ▲ +12.46% | ▲ +8.95% | $1.04 (+194.53%) |
Jun 29, 2026 17w ago | 144 | $0.3599 $0.3200 | ▲ +11.09% | ▲ +11.69% | $1.04 (−188.97%) |
Jun 29, 2026 17w ago | 144 | $0.3599 $0.3200 | ▲ +11.09% | ▲ +11.69% | $1.04 (−188.97%) |
US Market Status
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