Insider · CIK 0002127815
Michael John Isaacs
Files at PRTA (PROTHENA CORP PUBLIC LTD CO). First filing Jul 30, 2026, latest Jul 30, 2026.
In brief
Michael John Isaacs files SEC Form 4 as officer at PRTA (PROTHENA CORP PUBLIC LTD CO). Since Jul 30, 2026, Michael John Isaacs has reported 0 open-market buys worth $0 and 1 open-market sell worth $71k, the latest filed on Jul 30, 2026.
A track record needs three past buys with six months of prices behind them; Michael John Isaacs has 0, so none is measured yet.
The newest scored trade: sold $71k of PRTA on Jul 29, 2026, filed Jul 30, 2026, scored 16 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 1 sell worth $71k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
PRTA: PROTHENA CORP PUBLIC LTD CO
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 16Weak | PROTHENA CORP PUBLIC LTD CO | $71k 8,386 shares | -19% | +26% from low-26% from high |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Jul 29, 2026 | PRTA PROTHENA CORPORATION PUBLIC LIMITED COMPANY | 8,386 0.02% of outstanding | $71k | Jul 29, 2026 | none |
Transactions
Every row this insider has filed, 2 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Jul 28, 2026 | PRTA PROTHENA CORP PUBLIC LTD CO | FTax withholding Ordinary Shares, par value $0.01 per share10b5-1 | -4,694 | $8.56 | $40k | 44,131 | Jul 30, 2026 |
| Jul 29, 2026 | PRTA PROTHENA CORP PUBLIC LTD CO | SOpen-market sale Ordinary Shares, par value $0.01 per share10b5-1 | -8,386 | $8.47 | $71k | 35,745 | Jul 30, 2026 |
Questions about Michael John Isaacs
Answered from the filings on this page, as of the latest one.
Is Michael John Isaacs buying or selling?
In the last 12 months Michael John Isaacs reported 0 open-market buys worth $0 and 1 open-market sell worth $71k on SEC Form 4; the latest was sold $71k of PRTA on Jul 29, 2026. Grants, option exercises and tax withholding are not counted.
How did Michael John Isaacs's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Michael John Isaacs has 0.
Where does Michael John Isaacs file Form 4?
Michael John Isaacs has filed Form 4 at PRTA (PROTHENA CORP PUBLIC LTD CO) as General Counsel & Company Sec.. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.