This is a routine director sale of vested restricted stock for diversification. No material signal — monitor for any insider selling cluster or executive officer sales in the coming weeks.
Price Chart
Executive Summary
Director Errol B. De Souza filed a Form 144 notice of intent to sell 2,139 shares of Korsana Biosciences common stock, with an estimated aggregate market value of approximately $74,844 based on the filing date. The shares were acquired upon vesting of restricted stock between November 2023 and September 2024, and the sale is a routine diversification move by a director, not an executive officer.
Key Facts
- Insider: Errol B. De Souza, Director
- Shares to be sold: 2,139 shares of common stock
- Estimated aggregate market value: ~$74,844
- Shares acquired via restricted stock vesting from 11/30/2023 to 09/01/2024
- Broker: Morgan Stanley Smith Barney LLC Executive Financial Services
- Filing date: 09/18/2026
Financial Impact
Proposed sale of ~$74,844 worth of stock by a director — immaterial relative to company market cap (not provided) and represents a small portion of holdings.
Risk Factors
- Form 144 is an intent to sell; the sale may not be executed.
- No context on total insider holdings or market cap to assess proportionality.
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001950047-26-009679 |
| Document: 0001950047-26-009679-index.html | 0001950047-26-009679 |
| Document: 0001950047-26-009679.txt | 0001950047-26-009679 |
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
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