As of September 29, 2026, the three largest insider holders of ALEC are Terrance Mcguire (Director, 10.85Mn shares), Venture Management Co. Vi, L.L.C. Polaris (TenPercentOwner, 9.85Mn shares), Tillman U. Gerngross (Director, 2.64Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Terrance Mcguire | Director, TenPercentOwner | 0 | 10,853,817 | 10,853,817 | 37.7% | 13 Sep, 2023 |
| 2 | Venture Management Co. Vi, L.L.C. Polaris | TenPercentOwner | 0 | 9,853,817 | 9,853,817 | 34.2% | 31 May, 2024 |
| 3 | Tillman U. Gerngross | Director | 2,644,319 | 0 | 2,644,319 | 9.2% | 15 Jun, 2023 |
| 4 | Arnon Rosenthal | Chief Executive Officer | 2,294,600 | 0 | 2,294,600 | 8.0% | 04 Sep, 2026 |
| 5 | Robert King | Chief Development Officer | 550,871 | 0 | 550,871 | 1.9% | 04 Oct, 2022 |
| 6 | Sara Kenkare-Mitra | President And Head Of Rd | 501,652 | 0 | 501,652 | 1.7% | 03 Dec, 2025 |
| 7 | Neil Lindsay Berkley | Cfo Chief Business Officer | 350,649 | 0 | 350,649 | 1.2% | 04 Sep, 2026 |
| 8 | Gary Romano | Chief Medical Officer | 332,977 | 0 | 332,977 | 1.2% | 05 Mar, 2025 |
| 9 | Marc Grasso | Chief Financial Officer | 296,072 | 0 | 296,072 | 1.0% | 04 Jun, 2025 |
| 10 | Richard H Scheller | Director | 134,899 | 0 | 134,899 | 0.5% | 17 Jun, 2026 |
| 11 | Louis J Jr Lavigne | Director | 128,109 | 0 | 128,109 | 0.4% | 17 Jun, 2026 |
| 12 | Kristine Yaffe | Director | 124,109 | 0 | 124,109 | 0.4% | 17 Jun, 2026 |
| 13 | Elizabeth A. Garofalo | Director | 118,650 | 0 | 118,650 | 0.4% | 17 Jun, 2026 |
| 14 | David M. Wehner | Director | 115,330 | 0 | 115,330 | 0.4% | 12 Jun, 2024 |
| 15 | Grace Wong-Sarad | Principal Accounting Officer | 106,015 | 0 | 106,015 | 0.4% | 04 Sep, 2026 |
| 16 | Paula Hammond | Director | 103,609 | 0 | 103,609 | 0.4% | 17 Jun, 2026 |
| 17 | Shehnaaz Suliman | President And Coo | 102,598 | 0 | 102,598 | 0.4% | 14 Dec, 2021 |
| 18 | Errol B Desouza | Director | 98,650 | 0 | 98,650 | 0.3% | 17 Jun, 2026 |
| 19 | Mark Altmeyer | Director | 98,650 | 0 | 98,650 | 0.3% | 17 Jun, 2026 |
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 |
|---|---|---|---|---|---|---|---|---|
| 03 Sep, 2026 | Neil Lindsay Berkley | Cfo Chief Business Officer | Disposed S | 29,251 | $2.66 | $77.95K | 350,649 | Direct |
| 02 Sep, 2026 | Grace Wong-Sarad | Principal Accounting Officer | Disposed S | 656 | $2.75 | $1.80K | 114,805 | Direct |
| 03 Sep, 2026 | Arnon Rosenthal | Chief Executive Officer | Disposed S | 72,606 | $2.66 | $193.47K | 2,294,600 | Direct |
| 03 Sep, 2026 | Grace Wong-Sarad | Principal Accounting Officer | Disposed S | 5,165 | $2.67 | $13.77K | 109,640 | Direct |
| 04 Sep, 2026 | Grace Wong-Sarad | Principal Accounting Officer | Disposed S | 3,625 | $2.51 | $9.09K | 106,015 | Direct |
| 19 Aug, 2026 | Arnon Rosenthal | Chief Executive Officer | Disposed G | 1,050,000 | $0.00 | $0 | 922,875 | Indirect |
| 19 Aug, 2026 | Arnon Rosenthal | Chief Executive Officer | Acquired G | 350,000 | $0.00 | $0 | 1,002,500 | Indirect |
| 19 Aug, 2026 | Arnon Rosenthal | Chief Executive Officer | Acquired G | 350,000 | $0.00 | $0 | 1,002,500 | Indirect |
| 19 Aug, 2026 | Arnon Rosenthal | Chief Executive Officer | Acquired G | 350,000 | $0.00 | $0 | 1,002,500 | Indirect |
| 09 Jul, 2026 | Grace Wong-Sarad | Principal Accounting Officer | Acquired A | 20,000 | $0.00 | $0 | 115,461 | Direct |
| 17 Jun, 2026 | Richard H Scheller | Director | Acquired A | 28,700 | $0.00 | $0 | 134,899 | Direct |
| 17 Jun, 2026 | Errol B Desouza | Director | Acquired A | 28,700 | $0.00 | $0 | 98,650 | Direct |
| 17 Jun, 2026 | Mark Altmeyer | Director | Acquired A | 28,700 | $0.00 | $0 | 98,650 | Direct |
| 17 Jun, 2026 | Kristine Yaffe | Director | Acquired A | 28,700 | $0.00 | $0 | 124,109 | Direct |
| 17 Jun, 2026 | Louis J Jr Lavigne | Director | Acquired A | 28,700 | $0.00 | $0 | 128,109 | Direct |
| 17 Jun, 2026 | Paula Hammond | Director | Acquired A | 28,700 | $0.00 | $0 | 103,609 | Direct |
| 17 Jun, 2026 | Elizabeth A. Garofalo | Director | Acquired A | 28,700 | $0.00 | $0 | 118,650 | Direct |
| 17 Jun, 2026 | Mark Altmeyer | Director | Acquired A | 9,450 | $0.00 | $0 | 9,450 | Direct |
| 17 Jun, 2026 | Richard H Scheller | Director | Acquired A | 9,450 | $0.00 | $0 | 9,450 | Direct |
| 17 Jun, 2026 | Kristine Yaffe | Director | Acquired A | 9,450 | $0.00 | $0 | 9,450 | Direct |