Updated Jul 16, 2026
SUMME GREGORY L has filed 5 SEC Form 4 filings across 4 companies in the last 90 days — buying. Lifetime open-market purchases: $3.44M. Historical track record: 3/5 stars across 6 tracked purchases.
Gregory L. Summe is a corporate director known for his roles in various companies, including NXP Semiconductors and Avantor, Inc. He has significant experience in the technology and life sciences sectors.
| Role | Director |
|---|---|
| Notability | 30/100 |
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realised performance after each tracked open-market purchase.
| InsiderAlpha rating | ★★★☆☆ (3/5) |
|---|---|
| Total purchases tracked | 6 |
| Purchases with forward-return data | 6 |
| 30-day win rate | 6667% |
| 90-day win rate | 3333% |
| Avg 5-day return | +330.67% |
| Avg 30-day return | +107.26% |
| Avg 90-day return | -293.46% |
| Best 30-day return | +946.40% |
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-22 | GRAL | GRAIL, Inc. | A — Grant or award | 5.5K | $63.74 | $350K |
| 2026-06-12 | NXPI | NXP Semiconductors N.V. | F — Tax withholding / forfeiture | 513 | $297.41 | $153K |
| 2026-06-12 | NXPI | NXP Semiconductors N.V. | M — Option exercise | 1.0K | $0.00 | |
| 2026-06-11 | UP | Wheels Up Experience Inc. | A — Grant or award | 24.3K | $0.00 | |
| 2026-05-11 | AVTR | Avantor, Inc. | A — Grant or award | 25.3K | $0.00 | |
| 2026-04-17 | GRAL | GRAIL, Inc. | A — Grant or award | 631 | $49.79 | $31K |
| 2026-02-12 | AVTR | Avantor, Inc. | P — Open-market purchase | 100.0K | $9.40 | $940K |
| 2026-01-16 | GRAL | GRAIL, Inc. | A — Grant or award | 329 | $97.44 | $32K |
| 2025-10-15 | GRAL | GRAIL, Inc. | A — Grant or award | 425 | $75.52 | $32K |
| 2025-08-21 | AVTR | Avantor, Inc. | P — Open-market purchase | 100.0K | $12.56 | $1.26M |
| 2025-07-15 | GRAL | GRAIL, Inc. | A — Grant or award | 825 | $38.53 | $32K |
| 2025-06-10 | UP | Wheels Up Experience Inc. | A — Grant or award | 148.0K | $0.00 | |
| 2025-05-29 | NXPI | NXP Semiconductors N.V. | F — Tax withholding / forfeiture | 407 | $196.21 | $80K |
| 2025-05-29 | NXPI | NXP Semiconductors N.V. | M — Option exercise | 822 | $0.00 | |
| 2025-05-29 | GRAL | GRAIL, Inc. | A — Grant or award | 6.1K | $41.10 | $250K |
| 2025-05-23 | AVTR | Avantor, Inc. | P — Open-market purchase | 30.0K | $12.50 | $375K |
| 2025-05-22 | AVTR | Avantor, Inc. | P — Open-market purchase | 20.0K | $12.65 | $253K |
| 2025-05-08 | AVTR | Avantor, Inc. | A — Grant or award | 17.1K | $0.00 | |
| 2025-05-07 | AVTR | Avantor, Inc. | P — Open-market purchase | 25.0K | $12.00 | $300K |
| 2025-04-28 | AVTR | Avantor, Inc. | P — Open-market purchase | 25.0K | $12.50 | $312K |
Gregory L. Summe is a corporate director known for his roles in various companies, including NXP Semiconductors and Avantor, Inc. He has significant experience in the technology and life sciences sectors.…
5 primary Form 4 filings in the last 90 days, covering 4 companies.
Recorded transactions: 6 open-market purchases ($3.44M) and 0 open-market sales () across all tracked filings.
Across 6 tracked purchases, SUMME GREGORY L averaged +107.3% avg 30-day return with a 6667% 30-day win rate. InsiderAlpha rates the track record at 3/5 stars.
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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