GRNT's three largest insider shareholders as of September 29, 2026 are Gp Iii, Llc Grep (TenPercentOwner, 38.56Mn shares), Gp Ii, Llc Grep (TenPercentOwner, 5.20Mn shares), Matthew Reade Miller (Director, 1.97Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Gp Iii, Llc Grep | TenPercentOwner | 0 | 38,563,817 | 38,563,817 | 75.9% | 15 Sep, 2023 |
| 2 | Gp Ii, Llc Grep | TenPercentOwner | 5,198,504 | 0 | 5,198,504 | 10.2% | 23 Jan, 2023 |
| 3 | Matthew Reade Miller | Director | 1,974,292 | 0 | 1,974,292 | 3.9% | 14 Sep, 2026 |
| 4 | Griffin Perry | Director | 1,756,636 | 0 | 1,756,636 | 3.5% | 21 Aug, 2026 |
| 5 | Kirk Lazarine | Director | 1,660,756 | 0 | 1,660,756 | 3.3% | 21 Aug, 2026 |
| 6 | Thaddeus Darden | Director | 591,102 | 0 | 591,102 | 1.2% | 21 Aug, 2026 |
| 7 | Tyler Farquharson | President And Ceo | 344,743 | 0 | 344,743 | 0.7% | 13 May, 2026 |
| 8 | Luke C Brandenberg | President And Ceo | 157,267 | 0 | 157,267 | 0.3% | 04 Jun, 2025 |
| 9 | John Mccartney | Director | 154,143 | 0 | 154,143 | 0.3% | 02 Sep, 2026 |
| 10 | Ronald Kyle Kettler | Chief Financial Officer | 135,276 | 0 | 135,276 | 0.3% | 08 Sep, 2026 |
| 11 | Kimberly Weimer | Chief Accounting Officer | 97,914 | 0 | 97,914 | 0.2% | 09 Mar, 2026 |
| 12 | Michele J Everard | Director | 73,143 | 0 | 73,143 | 0.1% | 17 Aug, 2026 |
| 13 | Amanda N. Coussens | Director | 60,143 | 0 | 60,143 | 0.1% | 05 Jan, 2026 |
| 14 | Jonathan Anson Adams | Director | 25,020 | 0 | 25,020 | 0.0% | 21 Aug, 2026 |
| 15 | John Cocke | Director | 24,620 | 0 | 24,620 | 0.0% | 21 Aug, 2026 |
| 16 | Zoran Durkovic | Chief Accounting Officer | 12,948 | 0 | 12,948 | 0.0% | 23 Mar, 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 |
|---|---|---|---|---|---|---|---|---|
| 04 Sep, 2026 | Ronald Kyle Kettler | Chief Financial Officer | Acquired P | 6,000 | $5.05 | $30.30K | 135,276 | Direct |
| 01 Sep, 2026 | John Mccartney | Director | Acquired P | 5,000 | $5.04 | $25.20K | 154,143 | Direct |
| 19 Aug, 2026 | Kirk Lazarine | Director | Acquired J | 592,733 | $0.00 | $0 | 1,660,756 | Direct |
| 19 Aug, 2026 | Thaddeus Darden | Director | Acquired J | 220,418 | $0.00 | $0 | 591,102 | Direct |
| 19 Aug, 2026 | Matthew Reade Miller | Director | Acquired J | 598,531 | $0.00 | $0 | 1,964,292 | Direct |
| 19 Aug, 2026 | Jonathan Anson Adams | Director | Acquired A | 19,305 | $0.00 | $0 | 19,705 | Direct |
| 19 Aug, 2026 | Griffin Perry | Director | Acquired J | 592,733 | $0.00 | $0 | 1,756,636 | Direct |
| 19 Aug, 2026 | John Cocke | Director | Acquired A | 19,305 | $0.00 | $0 | 19,305 | Direct |
| 19 Aug, 2026 | John Cocke | Director | Acquired A | 5,315 | $0.00 | $0 | 24,620 | Direct |
| 19 Aug, 2026 | Jonathan Anson Adams | Director | Acquired A | 5,315 | $0.00 | $0 | 25,020 | Direct |
| 13 Aug, 2026 | John Mccartney | Director | Acquired P | 2,000 | $5.00 | $10.00K | 149,143 | Direct |
| 13 Aug, 2026 | Michele J Everard | Director | Acquired P | 1,000 | $5.00 | $5.00K | 73,143 | Direct |
| 30 Jun, 2026 | Matthew Reade Miller | Director | Acquired A | 4,252 | $0.00 | $0 | 1,365,761 | Direct |
| 12 Jun, 2026 | Matthew Reade Miller | Director | Acquired P | 696 | $4.97 | $3.46K | 1,361,509 | Direct |
| 10 Jun, 2026 | John Mccartney | Director | Acquired P | 4,000 | $4.96 | $19.84K | 147,143 | Direct |
| 09 Jun, 2026 | Matthew Reade Miller | Director | Acquired P | 10,600 | $4.75 | $50.35K | 1,360,813 | Direct |
| 27 May, 2026 | Ronald Kyle Kettler | Chief Financial Officer | Acquired P | 6,000 | $5.08 | $30.48K | 129,276 | Direct |
| 21 May, 2026 | John Mccartney | Director | Acquired P | 4,000 | $5.54 | $22.16K | 143,143 | Direct |
| 19 May, 2026 | John Mccartney | Director | Acquired P | 3,000 | $5.81 | $17.43K | 139,143 | Direct |
| 18 May, 2026 | Griffin Perry | Director | Acquired P | 100,000 | $5.49 | $549.00K | 1,163,903 | Direct |