Michael John Isaacs insider trades: Prothena Corp Public (PRTA) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Michael reports to the SEC
Open-market buys and sales
1 trade reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Jul 29, 2026 | PRTA | ↓ Sell | 8,386 | $8.47 | $71K | Direct | Jul 30, 2026 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other PRTA insiders
Open-market trades in the last 12 months
About Michael John Isaacs's insider trades
Michael John Isaacs is General Counsel & Company Sec. at Prothena Corp Public (PRTA). Since Jul 29, 2026, Michael has reported no open-market purchases and 1 sale worth $71K on SEC Form 4. In the last 12 months: 1 sale ($71K).
Their filings also include shares withheld for taxes (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every PRTA insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.