Monitor whether the sale is actually executed on Form 4; a director selling a modest number of vested RSU shares is routine and not indicative of negative outlook. No immediate catalyst.
Price Chart
Executive Summary
Director Errol B. De Souza filed a Form 144 to sell 4,903 shares of Korsana Biosciences common stock, with an approximate market value of $171,556. The shares were acquired via restricted stock vesting between October 2024 and July 2026. The filing signals an intent to sell, though the sale may not be executed.
Key Facts
- Filer: Director Errol B. De Souza
- Proposed sale: 4,903 shares of common stock
- Estimated value: $171,555.97
- Shares acquired via restricted stock vesting from 10/01/2024 through 07/16/2026
- Broker: Morgan Stanley Smith Barney LLC Executive Financial Services
- Filing date: 09/23/2026
Financial Impact
Proposed sale of 4,903 shares valued at approximately $171,556 — small relative to typical insider holdings and market cap; no material financial impact.
Risk Factors
- Insider selling could be perceived negatively if followed by additional large sales
- No market data or company financials provided to contextualize the sale
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001950047-26-009776 |
| Document: 0001950047-26-009776-index.html | 0001950047-26-009776 |
| Document: 0001950047-26-009776.txt | 0001950047-26-009776 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 22, 2026 5d ago | 144 | $31.31 | awaiting T+20 | awaiting T+20 | $30.07 (−3.96%) |
Oct 15, 2026 12d ago | SC 13G/A | $32.38 | awaiting T+20 | awaiting T+20 | $30.07 (−7.13%) |
Oct 15, 2026 12d ago | DEF 14A | $32.38 | awaiting T+20 | awaiting T+20 | $30.07 (−7.13%) |
Sep 23, 2026 4w ago | 144 | $37.19 $33.43 | ▼ −10.11% | ▼ −9.69% | $30.07 (−19.14%) |
Sep 22, 2026 5w ago | 144 | $32.30 $32.54 | ▲ +0.74% | ▲ +0.06% | $30.07 (−6.90%) |
Sep 18, 2026 5w ago | SC 13G | $33.21 $31.41 | ▼ −5.42% | ▼ −4.51% | $30.07 (−9.45%) |
Sep 18, 2026 5w ago | 144 | $33.21 $31.41 | ▼ −5.42% | ▼ −4.51% | $30.07 (−9.45%) |
Sep 16, 2026 5w ago | SC 13G | $31.23 $34.32 | ▲ +9.89% | ▲ +7.83% | $30.07 (−3.71%) |
US Market Status
Subscribe to SecBot
Get Real-Time SEC Filing Intelligence
Comprehensive SEC filing analysis delivered the moment filings hit EDGAR. Sentiment scoring, impact analysis, and actionable insights for every material event.
Create a free account Live analysis, Telegram alerts, watchlists and the MCP server for subscribers