David Hallal is CEO at ALEXION PHARMACEUTICALS INC (ALXN). They have made 59 open-market trades across 4 companies since 2009, most recently 2026-09-21.
CIK 0001457477
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 59 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| SRRK | 1,602,382 | $63.9M |
| ALXN | 189,266 | $34.5M |
| ALVR | 2,143,662 | $21.0M |
| SEER | 355,128 | $721K |
| ITOS | 38,228 | $388K |
| Total | $120.6M |
Shares reported on the most recent Form 4, priced at the 2026-09-23 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 60% | 60% | 80% |
| Avg Move | -0.9% | -2.7% | -14.2% |
| Scored | 5 | 5 | 5 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| SRRK | SELL | 2026-04-16 | 2026-04-20 | $49.57 | $1.5M | -2.8% | +0.8% | +5.5% |
| SRRK | SELL | 2026-01-13 | 2026-01-15 | $42.70 | $2.5M | -6.5% | +0.7% | +7.0% |
| ITOS | SELL · 10b5-1 | 2025-06-04 | 2025-06-06 | $10.15 | $2.3M | -1.7% | -1.0% | N/A |
| ALVR | SELL | 2022-10-19 | 2022-10-21 | $8.45 | $5.1M | -17.3% | -13.2% | -39.8% |
| ALVR | SELL | 2022-09-29 | 2022-09-30 | $7.35 | $2.9M | +14.5% | -12.1% | -35.0% |
| ALVR | SELL · 10b5-1 | 2022-07-21 | 2022-07-21 | $5.33 | $23K | +3.4% | +34.4% | +79.4% |
| ITOS | SELL | 2022-06-08 | 2022-06-10 | $20.18 | $1.2M | +26.6% | +36.3% | +26.5% |
| ALVR | SELL | 2022-06-03 | 2022-06-06 | $3.67 | $482K | -12.0% | +23.0% | +90.1% |
| ALVR | SELL · 10b5-1 | 2022-04-21 | 2022-04-22 | $5.87 | $25K | +12.0% | -9.5% | +21.5% |
| ALVR | SELL | 2022-03-10 | 2022-03-11 | $7.48 | $983K | +14.1% | -20.7% | -45.7% |
| ALVR | SELL | 2022-01-24 | 2022-01-25 | $8.01 | $137K | -3.5% | +9.5% | -40.6% |
| ITOS | SELL | 2021-12-20 | 2021-12-22 | $43.57 | $2.2M | -9.2% | -22.0% | -27.7% |
| ALXN | SELL | 2016-08-08 | 2016-08-10 | $137.14 | $46K | +2.8% | -6.0% | -10.2% |
| ALXN | SELL | 2016-04-01 | 2016-04-05 | $135.87 | $380K | +3.2% | -3.9% | -20.7% |
| ALXN | SELL | 2016-02-29 | 2016-03-01 | $138.93 | $280K | -6.9% | -6.9% | +0.9% |
| ALXN | SELL | 2016-02-08 | 2016-02-08 | $138.02 | $482K | +6.5% | +2.6% | +4.8% |
| ALXN | SELL | 2016-02-05 | 2016-02-08 | $141.61 | $368K | +6.5% | +2.6% | +4.8% |
| ALXN | SELL | 2016-02-04 | 2016-02-08 | $143.81 | $89K | +6.5% | +2.6% | +4.8% |
| ALXN | SELL | 2016-02-04 | 2016-02-08 | $140.50 | $1.6M | +6.5% | +2.6% | +4.8% |
| ALXN | SELL | 2015-08-07 | 2015-08-11 | $190.01 | $63K | -15.6% | -1.2% | -1.2% |
| ALXN | SELL | 2015-08-04 | 2015-08-05 | $196.52 | $120K | -15.6% | -1.2% | -1.2% |
| ALXN | SELL | 2015-03-02 | 2015-03-03 | $180.34 | $132K | -15.6% | -1.2% | -1.2% |
| ALXN | SELL | 2015-02-10 | 2015-02-12 | $171.15 | $339K | -15.6% | -1.2% | -1.2% |
| ALXN | SELL | 2015-02-09 | 2015-02-09 | $173.93 | $508K | -15.6% | -1.2% | -1.2% |
| ALXN | SELL | 2015-02-03 | 2015-02-05 | $174.18 | $239K | -15.6% | -1.2% | -1.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.