Merit Medical Systems, Inc. (MMSI) Insider Trading
Over the last 3 months, MMSI insiders made 5 open-market buys and 1 sale, a net purchase of $260K (SEC Form 4). Multiple insiders bought within days of each other (cluster buying). Over the last 6 months, 363 institutions increased and 240 reduced their position (13F).
Insider Activity
Sentiment
67/100
Buys (3m)
5
Sells (3m)
1
Net (3m)
$260.3K
Insiders buyingCluster buying
Insider trades by month Buys Sells
May
Jun
Aug
Nov
Jan
May
Context3-month price -18.2%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| May 21, 2026 | Gunderson Thomas J.director | Option | 13,750 | $52.17 |
| May 21, 2026 | Gunderson Thomas J.director | Option | 7,500 | $52.17 |
| May 19, 2026 | Ward Lynne N.director | Grant | 3,457 | — |
| May 19, 2026 | Perez Silvia M.director | Grant | 3,457 | — |
| May 19, 2026 | Ward Scott R.director | Grant | 3,457 | — |
| May 19, 2026 | Gunderson Thomas J.director | Grant | 3,457 | — |
| May 19, 2026 | Kaiser Laura S.director | Grant | 3,457 | — |
| May 19, 2026 | Evans Stephen C.director | Grant | 3,457 | — |
| May 19, 2026 | Carpenter Lonny J.director | Grant | 3,457 | — |
| May 19, 2026 | Millner F. Ann Ed.D.director | Grant | 3,457 | — |
| May 19, 2026 | McDonnell Michael R.director | Grant | 3,457 | — |
| May 13, 2026 | Smith Christian Adamofficer: Chief Commercial Officer | Buy | 1,626 | $61.00 |
| May 11, 2026 | Lloyd Brian G.officer: CHIEF LEGAL OFFICER, SECRETARY | Buy | 2,000 | $62.63 |
| May 11, 2026 | Ward Lynne N.director | Sell | 5,000 | $62.61 |
| May 7, 2026 | Aronson Martha Goldbergdirector, officer: President and CEO | Buy | 2,000 | $60.44 |
| May 7, 2026 | Parra Raul Jr.officer: CFO AND TREASURER | Buy | 1,500 | $61.01 |
| May 7, 2026 | Voigt Michel J.officer: CHIEF HUMAN RESOURCES OFFICER | Buy | 2,250 | $60.65 |
| Mar 2, 2026 | Lloyd Brian G.officer: CHIEF LEGAL OFFICER, SECRETARY | Grant | 17,002 | — |
| Mar 2, 2026 | Voigt Michel J.officer: CHIEF HUMAN RESOURCES OFFICER | Tax | 6,698 | $78.02 |
| Mar 2, 2026 | Smith Christian Adamofficer: Chief Commercial Officer | Grant | 6,762 | — |
| Mar 2, 2026 | Smith Christian Adamofficer: Chief Commercial Officer | Grant | 6,409 | — |
| Mar 2, 2026 | Lloyd Brian G.officer: CHIEF LEGAL OFFICER, SECRETARY | Grant | 6,409 | — |
| Mar 2, 2026 | Peterson Neil W.officer: CHIEF OPERATING OFFICER | Tax | 6,061 | $78.02 |
| Mar 2, 2026 | Voigt Michel J.officer: CHIEF HUMAN RESOURCES OFFICER | Grant | 17,002 | — |
| Mar 2, 2026 | Parra Raul Jr.officer: CFO AND TREASURER | Grant | 12,305 | — |
| Mar 2, 2026 | Smith Christian Adamofficer: Chief Commercial Officer | Grant | 8,203 | — |
| Mar 2, 2026 | Parra Raul Jr.officer: CFO AND TREASURER | Grant | 17,002 | — |
| Mar 2, 2026 | Parra Raul Jr.officer: CFO AND TREASURER | Grant | 9,613 | — |
| Mar 2, 2026 | Lloyd Brian G.officer: CHIEF LEGAL OFFICER, SECRETARY | Grant | 10,254 | — |
| Mar 2, 2026 | Aronson Martha Goldbergdirector, officer: President and CEO | Grant | 28,198 | — |
Source: MMSI SEC Form 4 filings, latest May 21, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their MMSI positions over the last 6 months (SEC Form 13F).
Increased
363
New positions
117
Reduced
240
Sold out
98
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BLACKROCK, INC. | Increased | 8.8M | May 13, 2026 |
| BLACKROCK, INC. | Increased | 8.7M | Feb 12, 2026 |
| VANGUARD GROUP INC | Reduced | 6.6M | Jan 29, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 3.5M | May 8, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 2.7M | May 15, 2026 |
| STATE STREET CORP | Increased | 2.4M | May 15, 2026 |
| STATE STREET CORP | Increased | 2.2M | Feb 13, 2026 |
| CONESTOGA CAPITAL ADVISORS, LLC | Increased | 2.2M | Apr 24, 2026 |
| FULLER & THALER ASSET MANAGEMENT, INC. | Increased | 2.1M | May 14, 2026 |
| CONESTOGA CAPITAL ADVISORS, LLC | Reduced | 2.1M | Feb 2, 2026 |
| FULLER & THALER ASSET MANAGEMENT, INC. | Increased | 2.1M | Feb 18, 2026 |
| FMR LLC | Increased | 1.8M | Feb 17, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.5M | May 15, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.5M | Feb 9, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 1.3M | Feb 17, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.