Insider · CIK 0001818588
Mostapha Tahiri
Files at STT (STATE STREET CORP). First filing May 5, 2025, latest Apr 24, 2026.
In brief
Mostapha Tahiri files SEC Form 4 as COO at STT (STATE STREET CORP). Since May 5, 2025, Mostapha Tahiri has reported 0 open-market buys worth $0 and 2 open-market sells worth $1.8M, the latest filed on Apr 24, 2026.
A track record needs three past buys with six months of prices behind them; Mostapha Tahiri has 0, so none is measured yet.
The newest scored trade: sold $1.5M of STT on Apr 22, 2026, filed Apr 24, 2026, scored 58 (moderate). In the last 12 months: 0 buys worth $0 and 1 sell worth $1.5M.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
STT: STATE STREET CORP
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 |
|---|---|---|---|---|---|
| 58Moderate | STATE STREET CORP | $1.5M 9,611 shares | -13% | +87% from low-1% from high | |
| 50Moderate | STATE STREET CORP | $361k 3,989 shares | -7% | +20% from low-11% 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 |
|---|---|---|---|---|---|
| Apr 22, 2026 | STT STATE STREET CORP | 9,611 0.00% of outstanding | $1.5M | Apr 22, 2026 | none |
| May 2, 2025 | STT STATE STREET CORP | 3,989 0.00% of outstanding | $361k | May 2, 2025 | none |
Transactions
Every row this insider has filed, 12 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Aug 14, 2026 | STT STATE STREET CORP | FTax withholding Common Stock | -54 | $191.74 | $10k | 64,497 | Aug 18, 2026 |
| May 15, 2026 | STT STATE STREET CORP | FTax withholding Common Stock | -91 | $152.85 | $14k | 64,551 | May 19, 2026 |
| Apr 22, 2026 | STT STATE STREET CORP | SOpen-market sale Common Stock | -9,611 | $152.93 | $1.5M | 64,642 | Apr 24, 2026 |
| Feb 26, 2026 | STT STATE STREET CORP | AGrant or award Common Stock | +14,259 | $0.00 | $0 | 74,253 | Mar 2, 2026 |
| Feb 13, 2026 | STT STATE STREET CORP | AGrant or award Common Stock | +10,193 | $0.00 | $0 | 63,902 | Feb 18, 2026 |
| Feb 13, 2026 | STT STATE STREET CORP | FTax withholding Common Stock | -1,639 | $127.97 | $210k | 62,263 | Feb 18, 2026 |
| Feb 13, 2026 | STT STATE STREET CORP | FTax withholding Common Stock | -2,269 | $127.97 | $290k | 59,994 | Feb 18, 2026 |
| Nov 14, 2025 | STT STATE STREET CORP | FTax withholding Common Stock | -74 | $116.84 | $8,646 | 53,709 | Nov 18, 2025 |
| Aug 15, 2025 | STT STATE STREET CORP | FTax withholding Common Stock | -70 | $111.07 | $7,775 | 53,783 | Aug 19, 2025 |
| May 15, 2025 | STT STATE STREET CORP | FTax withholding Common Stock | -50 | $98.20 | $4,910 | 53,853 | May 19, 2025 |
| May 2, 2025 | STT STATE STREET CORP | SOpen-market sale Common Stock | -3,989 | $90.43 | $361k | 53,903 | May 5, 2025 |
| Nov 15, 2024 | STT STATE STREET CORP | FTax withholding Common Stock | -69 | $95.48 | $6,588 | 38,070 | Nov 19, 2024 |
Questions about Mostapha Tahiri
Answered from the filings on this page, as of the latest one.
Is Mostapha Tahiri buying or selling?
In the last 12 months Mostapha Tahiri reported 0 open-market buys worth $0 and 1 open-market sell worth $1.5M on SEC Form 4; the latest was sold $1.5M of STT on Apr 22, 2026. Grants, option exercises and tax withholding are not counted.
How did Mostapha Tahiri's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Mostapha Tahiri has 0.
Where does Mostapha Tahiri file Form 4?
Mostapha Tahiri has filed Form 4 at STT (STATE STREET CORP) as EVP and COO. 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.