This is a standard post-IPO insider filing with no trading activity. Monitor future Form 4 filings for any open-market sales by these holders, which would signal a change in conviction.
Price Chart
Executive Summary
Westlake BioPartners funds and their general partners filed Form 3 initial beneficial ownership statements for Electra Therapeutics, Inc. (ETRA), disclosing aggregate holdings of 6,347,539 shares of common stock acquired upon conversion of preferred stock in connection with the company's IPO. This is a routine insider ownership filing that confirms the venture investors' post-IPO stake but provides no new trading or operational information.
Key Facts
- Westlake BioPartners Fund I, L.P. holds 3,527,136 shares of ETRA common stock.
- Westlake BioPartners Fund II, L.P. holds 2,820,403 shares of ETRA common stock.
- Shares were acquired upon automatic conversion of redeemable preferred stock on a 1:1 basis at the closing of the issuer's IPO.
- Beth Seidenberg is the sole managing director of the general partners and may be deemed to share voting and dispositive power over the shares.
- The filing is an initial statement of beneficial ownership (Form 3) filed on September 21, 2026.
Financial Impact
No financial impact — this is a routine initial ownership disclosure with no transaction or change in position.
Risk Factors
- No material risks identified from this filing.
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 3 Filing (Primary) | 0001104659-26-109399 |
| Document: 0001104659-26-109399-index.html | 0001104659-26-109399 |
| Document: 0001104659-26-109399.txt | 0001104659-26-109399 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 28, 2026 27d ago | SC 13G | $11.35 $11.25 | ▼ −0.88% | ▼ −0.68% | $8.37 (−26.26%) |
Sep 28, 2026 27d ago | SC 13G | $11.35 $11.25 | ▼ −0.88% | ▼ −0.68% | $8.37 (−26.26%) |
Sep 25, 2026 4w ago | SC 13D | $11.32 $11.35 | ▲ +0.27% | ▲ +0.45% | $8.37 (−26.06%) |
Sep 23, 2026 4w ago | Insider Cluster | $11.82 $11.55 | ▼ −2.28% | ▼ −2.83% | $8.37 (−29.19%) |
Sep 21, 2026 4w ago | 3 | $13.62 $12.67 | ▼ −6.97% | ▼ −6.25% | $8.37 (−38.55%) |
Sep 18, 2026 5w ago | 424B4 | $13.92 $13.62 | ▼ −2.16% | ▼ −2.14% | $8.37 (−39.87%) |
Sep 18, 2026 5w ago | 3 | $13.92 $13.62 | ▼ −2.16% | ▼ −2.14% | $8.37 (−39.87%) |
Sep 18, 2026 5w ago | 3 | $13.92 $13.62 | ▼ −2.16% | ▼ −2.14% | $8.37 (−39.87%) |
Sep 18, 2026 5w ago | 3 | $13.92 $13.62 | ▼ −2.16% | ▼ −2.14% | $8.37 (−39.87%) |
Sep 18, 2026 5w ago | EFFECT | $13.25 $13.92 | ▲ +5.06% | ▲ +3.51% | $8.37 (−36.83%) |
US Market Status
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