As of September 29, 2026, the three largest insider holders of GRCE are Management Inc. Opaleye (TenPercentOwner, 2.86Mn shares), Vimal Kavuru (Director, 1.19Mn shares), Prashant Kohli (Chief Executive Officer, 121.36K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Management Inc. Opaleye | TenPercentOwner | 0 | 2,855,318 | 2,855,318 | 68.6% | 23 Sep, 2026 |
| 2 | Vimal Kavuru | Director, TenPercentOwner | 0 | 1,188,076 | 1,188,076 | 28.5% | 27 Sep, 2023 |
| 3 | Prashant Kohli | Chief Executive Officer | 121,357 | 0 | 121,357 | 2.9% | 10 Sep, 2026 |
| 4 | Donald Olds | Director | 381 | 0 | 381 | 0.0% | 05 Sep, 2023 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 21 Sep, 2026 | Management Inc. Opaleye | TenPercentOwner | Acquired P | 9,771 | $2.10 | $20.52K | 2,850,000 | Indirect |
| 23 Sep, 2026 | Management Inc. Opaleye | TenPercentOwner | Acquired P | 5,318 | $2.10 | $11.17K | 2,855,318 | Indirect |
| 17 Sep, 2026 | Vimal Kavuru | Director | Acquired A | 12,200 | $0.00 | $0 | 12,200 | Direct |
| 17 Sep, 2026 | George Kottayil | Director | Acquired A | 12,200 | $0.00 | $0 | 12,200 | Direct |
| 17 Sep, 2026 | Edward Neugeboren | Director | Acquired A | 12,200 | $0.00 | $0 | 12,200 | Direct |
| 09 Sep, 2026 | Prashant Kohli | Chief Executive Officer | Acquired P | 100,000 | $2.14 | $214.00K | 121,357 | Direct |
| 08 Sep, 2026 | Management Inc. Opaleye | TenPercentOwner | Acquired P | 9,393 | $2.10 | $19.70K | 2,769,393 | Indirect |
| 09 Sep, 2026 | Management Inc. Opaleye | TenPercentOwner | Acquired P | 5,836 | $2.09 | $12.20K | 2,775,229 | Indirect |
| 28 Aug, 2026 | Prashant Kohli | Chief Executive Officer | Acquired A | 267,160 | $0.00 | $0 | 267,160 | Direct |
| 28 Aug, 2026 | Amresh Kumar | Vp Program Management | Acquired A | 35,760 | $0.00 | $0 | 35,760 | Direct |
| 28 Aug, 2026 | R. Loch Macdonald | Chief Medical Officer | Acquired A | 54,690 | $0.00 | $0 | 54,690 | Direct |
| 28 Aug, 2026 | Robert J Delaversano | Principal Financial Officer | Acquired A | 33,660 | $0.00 | $0 | 33,660 | Direct |
| 14 Aug, 2026 | Management Inc. Opaleye | TenPercentOwner | Acquired P | 11,608 | $2.09 | $24.21K | 2,760,000 | Indirect |
| 08 Jan, 2026 | A Brian Davis | Director | Acquired A | 10,000 | $0.00 | $0 | 10,000 | Direct |
| 08 Jan, 2026 | Edward Neugeboren | Director | Acquired A | 10,000 | $0.00 | $0 | 10,000 | Direct |
| 08 Jan, 2026 | George Kottayil | Director | Acquired A | 10,000 | $0.00 | $0 | 10,000 | Direct |
| 08 Jan, 2026 | Vimal Kavuru | Director | Acquired A | 10,000 | $0.00 | $0 | 10,000 | Direct |
| 09 May, 2025 | Vimal Kavuru | Director | Acquired A | 10,000 | $0.00 | $0 | 10,000 | Direct |
| 09 May, 2025 | Edward Neugeboren | Director | Acquired A | 10,000 | $0.00 | $0 | 10,000 | Direct |
| 09 May, 2025 | George Kottayil | Director | Acquired A | 10,000 | $0.00 | $0 | 10,000 | Direct |