ASTH's three largest insider shareholders as of September 29, 2026 are Albert Waichow Young (Chief Administrative Officer, 11.38Mn shares), Thomas S. Lam (President And Co Ceo, 10.19Mn shares), Kenneth T. Sim (Executive Chairman, 10.19Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Albert Waichow Young | Chief Administrative Officer | 1,184,749 | 10,191,660 | 11,376,409 | 55.3% | 06 Dec, 2022 |
| 2 | Physicians Of California, A Professional Medical Corp Allied | TenPercentOwner | 6,132,802 | 0 | 6,132,802 | 29.8% | 18 Feb, 2025 |
| 3 | Brandon Sim | Ceo And President | 1,238,861 | 0 | 1,238,861 | 6.0% | 09 Sep, 2026 |
| 4 | Kenneth T. Sim | Executive Chairman | 739,407 | 0 | 739,407 | 3.6% | 07 Apr, 2026 |
| 5 | Thomas S. Lam | President And Co Ceo | 465,657 | 0 | 465,657 | 2.3% | 07 Apr, 2026 |
| 6 | Dinesh M. Kumar | Chief Medical Officer | 177,655 | 0 | 177,655 | 0.9% | 03 Apr, 2026 |
| 7 | Chandan Basho | Coo And Cfo | 157,820 | 0 | 157,820 | 0.8% | 08 Sep, 2026 |
| 8 | Linda Dong | Director | 97,133 | 0 | 97,133 | 0.5% | 12 Jun, 2026 |
| 9 | Matthew Mazdyasni | Director | 39,288 | 0 | 39,288 | 0.2% | 12 Jun, 2026 |
| 10 | David Schmidt | Director | 36,019 | 0 | 36,019 | 0.2% | 18 Aug, 2026 |
| 11 | John Chiang | Director | 35,373 | 0 | 35,373 | 0.2% | 12 Jun, 2026 |
| 12 | Mitchell W Kitayama | Director | 24,337 | 0 | 24,337 | 0.1% | 01 Sep, 2026 |
| 13 | John Vong | Svp Accounting (Pao) | 22,330 | 0 | 22,330 | 0.1% | 17 Sep, 2026 |
| 14 | Eric Chin | Chief Financial Officer | 20,844 | 0 | 20,844 | 0.1% | 04 Apr, 2022 |
| 15 | Weili Dai, | Director | 18,188 | 0 | 18,188 | 0.1% | 12 Jun, 2026 |
| 16 | Glenn Sobotka | Chief Accounting Officer | 2,246 | 0 | 2,246 | 0.0% | 11 Aug, 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 |
|---|---|---|---|---|---|---|---|---|
| 15 Sep, 2026 | John Vong | Svp Accounting (Pao) | Disposed F | 96 | $38.35 | $3.68K | 22,330 | Direct |
| 05 Sep, 2026 | Brandon Sim | Ceo And President | Disposed F | 7,163 | $38.47 | $275.56K | 1,238,861 | Direct |
| 05 Sep, 2026 | Chandan Basho | Coo And Cfo | Disposed F | 1,790 | $38.47 | $68.86K | 157,820 | Direct |
| 31 Aug, 2026 | Mitchell W Kitayama | Director | Disposed D | 8,500 | $37.09 | $315.27K | 24,337 | Direct |
| 14 Aug, 2026 | David Schmidt | Director | Acquired M | 20,000 | $5.00 | $100.00K | 56,019 | Direct |
| 14 Aug, 2026 | David Schmidt | Director | Disposed D | 20,000 | $38.59 | $771.80K | 36,019 | Direct |
| 14 Aug, 2026 | David Schmidt | Director | Disposed M | 20,000 | $0.00 | $0 | 0 | Direct |
| 07 Aug, 2026 | Glenn Sobotka | Other | Disposed D | 11,793 | $0.00 | $0 | 2,246 | Direct |
| 27 Jun, 2026 | Brandon Sim | Ceo And President | Disposed F | 1,093 | $44.51 | $48.65K | 1,245,292 | Direct |
| 10 Jun, 2026 | Mitchell W Kitayama | Director | Acquired A | 4,991 | $0.00 | $0 | 32,837 | Direct |
| 10 Jun, 2026 | David Schmidt | Director | Acquired A | 4,525 | $0.00 | $0 | 36,019 | Direct |
| 10 Jun, 2026 | Linda Dong | Director | Acquired A | 4,525 | $0.00 | $0 | 97,133 | Direct |
| 10 Jun, 2026 | Weili Dai, | Director | Acquired A | 4,525 | $0.00 | $0 | 18,188 | Direct |
| 10 Jun, 2026 | John Chiang | Director | Acquired A | 4,525 | $0.00 | $0 | 35,373 | Direct |
| 10 Jun, 2026 | Matthew Mazdyasni | Director | Acquired A | 4,525 | $0.00 | $0 | 39,288 | Direct |
| 16 May, 2026 | Chandan Basho | Coo And Cfo | Disposed F | 8,155 | $38.26 | $312.01K | 159,610 | Direct |
| 14 Apr, 2026 | Chandan Basho | Coo And Cfo | Disposed F | 3,870 | $29.07 | $112.50K | 167,765 | Direct |
| 06 Apr, 2026 | Brandon Sim | Ceo And President | Acquired A | 201,056 | $0.00 | $0 | 1,246,385 | Direct |
| 06 Apr, 2026 | Kenneth T. Sim | Executive Chairman | Acquired A | 100,000 | $0.00 | $0 | 739,407 | Direct |
| 06 Apr, 2026 | Thomas S. Lam | Director | Acquired A | 41,667 | $0.00 | $0 | 465,657 | Direct |