As of September 29, 2026, the three largest insider holders of OMER are Gregory A Md Demopulos (Chairman, Ceo President, 1.73Mn shares), Gregory A Md Demopulos (Chairman, Ceo President, 1.47Mn shares), Peter A Md Demopulos (Director, 208.52K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Gregory A Md Demopulos | Chairman, Ceo President | 2,896,294 | 300,000 | 3,196,294 | 92.6% | 20 Feb, 2026 |
| 2 | Peter A Md Demopulos | Director | 208,516 | 0 | 208,516 | 6.0% | 17 Nov, 2023 |
| 3 | Thomas J. Cable | Director | 35,067 | 0 | 35,067 | 1.0% | 21 Aug, 2026 |
| 4 | Thomas F. Bumol | Director | 0 | 10,000 | 10,000 | 0.3% | 14 Sep, 2023 |
| 5 | Peter B Cancelmo | Vp, General Counsel | 200 | 0 | 200 | 0.0% | 01 Sep, 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 |
|---|---|---|---|---|---|---|---|---|
| 22 Sep, 2026 | David J. Borges | Vp, Finance Cao | Acquired M | 5,000 | $3.93 | $19.65K | 5,000 | Direct |
| 22 Sep, 2026 | David J. Borges | Vp, Finance Cao | Acquired M | 5,000 | $2.94 | $14.70K | 10,000 | Direct |
| 22 Sep, 2026 | David J. Borges | Vp, Finance Cao | Disposed S | 10,000 | $20.95 | $209.50K | 0 | Direct |
| 23 Sep, 2026 | David J. Borges | Vp, Finance Cao | Acquired M | 10,000 | $15.58 | $155.80K | 10,000 | Direct |
| 23 Sep, 2026 | David J. Borges | Vp, Finance Cao | Disposed S | 10,000 | $20.95 | $209.50K | 0 | Direct |
| 22 Sep, 2026 | David J. Borges | Vp, Finance Cao | Disposed M | 5,000 | $0.00 | $0 | 4,094 | Direct |
| 22 Sep, 2026 | David J. Borges | Vp, Finance Cao | Disposed M | 5,000 | $0.00 | $0 | 15,000 | Direct |
| 23 Sep, 2026 | David J. Borges | Vp, Finance Cao | Disposed M | 10,000 | $0.00 | $0 | 5,000 | Direct |
| 28 Aug, 2026 | Peter B Cancelmo | Vp, General Counsel | Acquired M | 25,000 | $2.94 | $73.50K | 25,200 | Direct |
| 28 Aug, 2026 | Peter B Cancelmo | Vp, General Counsel | Disposed S | 25,000 | $18.65 | $466.13K | 200 | Direct |
| 31 Aug, 2026 | Peter B Cancelmo | Vp, General Counsel | Acquired M | 25,000 | $2.94 | $73.50K | 25,200 | Direct |
| 31 Aug, 2026 | Peter B Cancelmo | Vp, General Counsel | Disposed S | 25,000 | $18.54 | $463.54K | 200 | Direct |
| 28 Aug, 2026 | Peter B Cancelmo | Vp, General Counsel | Disposed M | 25,000 | $0.00 | $0 | 75,000 | Direct |
| 31 Aug, 2026 | Peter B Cancelmo | Vp, General Counsel | Disposed M | 25,000 | $0.00 | $0 | 50,000 | Direct |
| 26 Aug, 2026 | Arnold C Hanish | Director | Acquired M | 5,000 | $15.81 | $79.05K | 5,000 | Direct |
| 26 Aug, 2026 | Arnold C Hanish | Director | Disposed S | 5,000 | $18.53 | $92.63K | 0 | Direct |
| 27 Aug, 2026 | Arnold C Hanish | Director | Acquired M | 2,500 | $15.81 | $39.53K | 2,500 | Direct |
| 27 Aug, 2026 | Arnold C Hanish | Director | Acquired M | 7,500 | $14.66 | $109.95K | 10,000 | Direct |
| 27 Aug, 2026 | Arnold C Hanish | Director | Disposed S | 5,000 | $18.88 | $94.38K | 5,000 | Direct |
| 27 Aug, 2026 | Arnold C Hanish | Director | Disposed S | 5,000 | $19.02 | $95.08K | 0 | Direct |