OPTIMIZERx Corp
Ownership
Ownership Structure
Who owns OPTIMIZERx Corp (OPRX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 76.9% of the shares are freely tradable; institutional investors hold 77.7%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Whetstone Capital Advisors, LLC | 8.01 | 1,508,303 | +0.0 | 06/30/2026 |
| Royce & Associates, LP | 5.78 | 1,089,398 | +22.7 | 06/30/2026 |
| Vanguard Capital Management, LLC | 3.71 | 699,604 | +2.1 | 06/30/2026 |
| Kennedy Capital Management Inc | 3.42 | 644,150 | -1.8 | 06/30/2026 |
| Rice Hall James & Associates, LLC | 3.37 | 633,842 | +5.3 | 06/30/2026 |
| Blair William & Co | 3.23 | 607,925 | -1.1 | 06/30/2026 |
| AQR Capital Management LLC | 3.10 | 583,956 | +171.7 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Royce Small-Cap Opportunity Invmt | 3.57 | 672,016 | +31.8 | 09/30/2026 |
| FTGF RY US SmCp Opp A USD Dis(A) | 3.25 | 611,895 | -3.0 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 2.62 | 494,252 | +0.0 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Silvestro Stephen L | Chief Executive Officer | 183,551 | 1,707,024 $ | Aug 21, 2026 | direct |
| Stelmakh Edward | Chief Finance & Strat Officer | 121,791 | 1,132,656 $ | Aug 21, 2026 | direct |
| D'Silva Andrew J. | Chief Business Officer | 99,246 | 922,988 $ | Oct 1, 2026 | direct |
| Odence-Ford Marion | Chief Legal & Admin Officer | 90,407 | 840,785 $ | Aug 21, 2026 | direct |
| Merrell Brendan W. | CHIEF OPERATING OFFICER | 25,187 | 234,239 $ | Aug 21, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 1, 2026 | D'Silva Andrew J. | Chief Business Officer | Other | 414 | 8.39 | 3,473 |
| Sep 1, 2026 | D'Silva Andrew J. | Chief Business Officer | Other | 1,432 | 7.86 | 11,256 |
| Aug 21, 2026 | Merrell Brendan W. | CHIEF OPERATING OFFICER | Other | 1,020 | 7.71 | 7,864 |
| Aug 21, 2026 | Silvestro Stephen L | Chief Executive Officer | Other | 1,737 | 7.71 | 13,392 |
| Aug 21, 2026 | Odence-Ford Marion | Chief Legal & Admin Officer | Other | 1,529 | 7.71 | 11,789 |
| Aug 21, 2026 | D'Silva Andrew J. | Chief Business Officer | Other | 1,243 | 7.71 | 9,584 |
| Aug 21, 2026 | Stelmakh Edward | Chief Finance & Strat Officer | Other | 1,381 | 7.71 | 10,648 |
| Aug 20, 2026 | Silvestro Stephen L | Chief Executive Officer | Other | 79,200 | 0.00 | – |
| Aug 20, 2026 | D'Silva Andrew J. | Chief Business Officer | Other | 57,600 | 0.00 | – |
| Aug 20, 2026 | Merrell Brendan W. | CHIEF OPERATING OFFICER | Other | 57,600 | 0.00 | – |
| Aug 20, 2026 | Odence-Ford Marion | Chief Legal & Admin Officer | Other | 57,600 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 3, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.