As of September 09, 2026, the three largest insider holders of HROW are Mark L Baum (Chief Executive Officer, 3.00Mn shares), Mark L Baum (Chief Executive Officer, 2.89Mn shares), Andrew R. Boll (President And Cfo, 811.18K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Mark L Baum | Chief Executive Officer | 5,882,254 | 0 | 5,882,254 | 72.8% | 15 May, 2026 |
| 2 | Andrew R. Boll | President And Cfo | 1,379,268 | 0 | 1,379,268 | 17.1% | 16 Dec, 2025 |
| 3 | John P. Saharek | Ceo President, Imprimisrx | 767,051 | 0 | 767,051 | 9.5% | 07 Apr, 2025 |
| 4 | Martin A. Makary | Director | 45,000 | 0 | 45,000 | 0.6% | 15 Aug, 2023 |
| 5 | Horn R. Lawrence Van | Director | 1,860 | 0 | 1,860 | 0.0% | 23 Dec, 2022 |
| 6 | Lauren P Silvernail | Director | 1,000 | 0 | 1,000 | 0.0% | 19 May, 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 |
|---|---|---|---|---|---|---|---|---|
| 14 Aug, 2026 | Amir Shojaei | Chief Scientific Officer | Acquired M | 11,250 | $35.96 | $404.55K | 11,250 | Direct |
| 14 Aug, 2026 | Amir Shojaei | Chief Scientific Officer | Disposed S | 11,250 | $40.00 | $450.00K | 0 | Direct |
| 14 Aug, 2026 | Amir Shojaei | Chief Scientific Officer | Disposed M | 11,250 | $35.96 | $404.55K | 18,750 | Direct |
| 18 Jun, 2026 | Lauren P Silvernail | Director | Acquired A | 5,248 | $0.00 | $0 | 5,248 | Direct |
| 18 Jun, 2026 | Adrienne L Graves | Director | Acquired A | 5,248 | $0.00 | $0 | 5,248 | Direct |
| 18 Jun, 2026 | Perry J. Sternberg | Director | Acquired A | 5,248 | $0.00 | $0 | 5,248 | Direct |
| 18 May, 2026 | Lauren P Silvernail | Director | Acquired P | 1,000 | $31.00 | $31.00K | 1,000 | Direct |
| 18 May, 2026 | Adrienne L Graves | Director | Acquired P | 1,000 | $31.07 | $31.07K | 1,000 | Direct |
| 15 May, 2026 | Amir Shojaei | Chief Scientific Officer | Acquired A | 10,000 | $0.00 | $0 | 10,000 | Direct |
| 14 May, 2026 | Mark L Baum | Chief Executive Officer | Acquired P | 10,000 | $30.20 | $302.00K | 2,996,130 | Direct |
| 30 Jan, 2026 | Patrick William Sullivan | Chief Commercial Officer | Acquired A | 25,000 | $0.00 | $0 | 25,000 | Direct |
| 30 Jan, 2026 | Patrick William Sullivan | Chief Commercial Officer | Acquired A | 25,000 | $0.00 | $0 | 25,000 | Direct |
| 30 Jan, 2026 | Patrick William Sullivan | Chief Commercial Officer | Acquired A | 25,000 | $0.00 | $0 | 25,000 | Direct |
| 30 Jan, 2026 | Patrick William Sullivan | Chief Commercial Officer | Acquired A | 25,000 | $0.00 | $0 | 25,000 | Direct |
| 30 Jan, 2026 | Patrick William Sullivan | Chief Commercial Officer | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 30 Jan, 2026 | Patrick William Sullivan | Chief Commercial Officer | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 30 Jan, 2026 | Patrick William Sullivan | Chief Commercial Officer | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 30 Jan, 2026 | Patrick William Sullivan | Chief Commercial Officer | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 12 Dec, 2025 | Andrew R. Boll | President And Cfo | Acquired M | 60,000 | $3.95 | $237.00K | 837,844 | Direct |
| 12 Dec, 2025 | Mark L Baum | Chief Executive Officer | Acquired M | 180,000 | $3.95 | $711.00K | 3,066,124 | Direct |