Summary
Updated Aug 31, 2026
Chun R. Ding files SEC Form 4 reports at GRAIL, Inc. (GRAL). 2 SEC Form 4 filings on record going back to 2024, most recently on 1 July 2025. Most recent open-market trade: sold $1.40M of GRAL on 1 July 2025. Lifetime open-market purchases: $1.02M. Lifetime open-market sales: $16.83M. Historical track record: 4/5 stars across 4 tracked purchases.
Recent Transactions
8Every recent SEC Form 4 transaction Chun R. Ding 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 | ★★★★☆ (4/5) |
| Total purchases tracked | 4 |
| Purchases with forward-return data | 4 |
| 30-day win rate | 100% |
| 90-day win rate | 100% |
| Avg 5-day return | +0.97% |
| Avg 30-day return | +6.97% |
| Avg 90-day return | +39.04% |
| Best 30-day return | +11.99% |
Trading Pattern
InsiderAlpha's records for Chun R. Ding go back to 2024: 2 primary Form 4 filings, an average of 0.7 per year. The typical open-market purchase is $256K (4 buys totaling $1.02M). The largest single buy on record is $445K of GRAL in 2024. Sales side: 3 recorded sales totaling $16.83M, so the filing history runs sell-heavy by dollar value. 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 Chun R. Ding 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
- Andrew John Partridge - $91K of GRAL 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 Chun R. Ding?
Chun R. Ding is a corporate insider of GRAIL, Inc. (GRAL). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Chun R. Ding last file a Form 4?
The most recent primary Form 4 on record is dated 1 July 2025, one of 2 filings going back to 2024.
Has Chun R. Ding been buying or selling stock?
Recorded transactions: 4 open-market purchases ($1.02M) and 3 open-market sales ($16.83M) across all tracked filings.
How accurate is Chun R. Ding's historical track record?
Across 4 tracked purchases, Chun R. Ding averaged +7.0% avg 30-day return with a 100% 30-day win rate. InsiderAlpha rates the track record at 4/5 stars.
Where can I see all of Chun R. Ding'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.
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