Summary
Updated Aug 31, 2026
Gregory L. Summe is Director of GRAIL, Inc. (GRAL). 24 SEC Form 4 filings on record going back to 2024, most recently on 16 July 2026. Most recent open-market trade: bought $940K of AVTR on 12 February 2026. Lifetime open-market purchases: $4.56M. Historical track record: 3/5 stars across 7 tracked purchases.
Recent Transactions
20Every recent SEC Form 4 transaction Gregory L. Summe has reported, most recent first.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★★★☆☆ (3/5) |
| Total purchases tracked | 7 |
| Purchases with forward-return data | 7 |
| 30-day win rate | 71% |
| 90-day win rate | 29% |
| Avg 5-day return | +3.52% |
| Avg 30-day return | +1.82% |
| Avg 90-day return | -2.52% |
| Best 30-day return | +9.46% |
Trading Pattern
InsiderAlpha's records for Gregory L. Summe go back to 2024: 24 primary Form 4 filings, an average of 8.0 per year. The typical open-market purchase is $652K (7 buys totaling $4.56M). The largest single buy on record is $1.26M of AVTR in 2025. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Gregory L. Summe files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- ILLUMINA, INC. - $79.85M of GRAL open-market activity in the last 12 months
- Robert P. Ragusa - $12.76M of GRAL open-market activity in the last 12 months
- Joshua J. Ofman - $12.29M of GRAL open-market activity in the last 12 months
- Aaron Freidin - $5.53M of GRAL open-market activity in the last 12 months
- Christopher L. Jensen - $2.15M of NXPI open-market activity in the last 12 months
- Jennifer Wuamett - $1.73M of NXPI open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Gregory L. Summe?
Gregory L. Summe is a corporate insider, tracked as Director of GRAIL, Inc. (GRAL). InsiderAlpha holds 24 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Gregory L. Summe submitted recently?
4 primary Form 4 filings in the last 90 days, covering 3 companies.
Has Gregory L. Summe been buying or selling stock?
Recorded transactions: 7 open-market purchases ($4.56M) and 0 open-market sales across all tracked filings.
How accurate is Gregory L. Summe's historical track record?
Across 7 tracked purchases, Gregory L. Summe averaged +1.8% avg 30-day return with a 71% 30-day win rate. InsiderAlpha rates the track record at 3/5 stars.
Where can I see all of Gregory L. Summe's SEC filings?
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.
Learn More
Follow Gregory L. Summe and every insider like them
A free account opens the full scored daily plan and every past day, a watchlist for any ticker, and 3 months of price history on every company page. No card.
Free plan available · Paid plans start with a 7-day free trial