Merit Medical Systems, Inc.
Merit Medical Systems, Inc. (MMSI) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MMSI · as of Sep 30, 2025
Ownership Breakdown
386
Institutional Holders
$5.04B
Total Inst. Value
▼ $821.61M vs Q2
59.65M
Shares Outstanding
freeFloat 97.54%
60.91M
13F Shares Held
▼ 2.15M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MMSI largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
TUDOR INVESTMENT CORP ET AL surgical & medical instruments & apparatus | 35.00M | 59.18% | 59.18% | $40.86B | Nov 14, 2025 | NEW |
BLACKROCK, INC. surgical & medical instruments & apparatus | 8.70M | 14.71% | 14.71% | $724.13B | Nov 12, 2025 | ▼ 14.9K |
VANGUARD GROUP INC surgical & medical instruments & apparatus | 6.64M | 11.23% | 11.23% | $552.93B | Nov 7, 2025 | ▼ 185.8K |
STATE STREET CORP surgical & medical instruments & apparatus | 2.20M | 3.72% | 3.72% | $182.99B | Nov 14, 2025 | ▼ 19.8K |
CONESTOGA CAPITAL ADVISORS, LLC surgical & medical instruments & apparatus | 2.19M | 3.70% | 3.70% | $181.88B | Oct 24, 2025 | ▼ 26.3K |
FULLER & THALER ASSET MANAGEMENT, INC. surgical & medical instruments & apparatus | 1.84M | 3.12% | 3.12% | $153.40B | Nov 13, 2025 | ▲ 23.7K |
FMR LLC surgical & medical instruments & apparatus | 1.62M | 2.74% | 2.74% | $134.90B | Nov 13, 2025 | ▼ 920.4K |
MAVERICK CAPITAL LTD surgical & medical instruments & apparatus | 1.61M | 2.72% | 2.72% | $134.02B | Nov 14, 2025 | ▲ 230.8K |
GEODE CAPITAL MANAGEMENT, LLC surgical & medical instruments & apparatus | 1.45M | 2.46% | 2.46% | $120.86B | Nov 12, 2025 | ▲ 14.6K |
MACQUARIE GROUP LTD surgical & medical instruments & apparatus | 1.33M | 2.25% | 2.25% | $110.83B | Nov 13, 2025 | ▼ 124.7K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
21
Increased
+3.57M shares1
New Positions
first time holders26
Decreased
−3.98M shares0
Sold Out
fully exitedNet shares change (top 50)
408.5K
+3.57M / −3.98M
Net new holders
-4
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MMSI insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
16
Buy transactions
2
Sell transactions
8.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Lloyd Brian G. CHIEF LEGAL OFFICER, SECRETARY | Jun 5, 2026 | Gift | 2,000 | — | — | 60.1K | Form 4 ↗ |
Ward Lynne N. director | May 18, 2026 | Award | 3,457 | — | — | 11.3K | Form 4 ↗ |
Ward Scott R. director | May 18, 2026 | Award | 3,457 | — | — | 3.5K | Form 4 ↗ |
Gunderson Thomas J. director | May 18, 2026 | Award | 3,457 | — | — | 39.5K | Form 4 ↗ |
Evans Stephen C. director | May 18, 2026 | Award | 3,457 | — | — | 10.3K | Form 4 ↗ |
Kaiser Laura S. director | May 18, 2026 | Award | 3,457 | — | — | 13.4K | Form 4 ↗ |
Perez Silvia M. director | May 18, 2026 | Award | 3,457 | — | — | 8.0K | Form 4 ↗ |
Carpenter Lonny J. director | May 18, 2026 | Award | 3,457 | — | — | 20.8K | Form 4 ↗ |
McDonnell Michael R. director | May 18, 2026 | Award | 3,457 | — | — | 9.9K | Form 4 ↗ |
Millner F. Ann Ed.D. director | May 18, 2026 | Award | 3,457 | — | — | 38.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Merit Medical Systems, Inc. (MMSI) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 2.46%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Merit Medical Systems, Inc. is TUDOR INVESTMENT CORP ET AL, holding approximately 35.00 million shares — equal to 59.18% of outstanding shares — as of September 30, 2025.
A total of 386 institutional investors currently hold MMSI stock, with a combined institutional value of approximately $5.04 billion as of the most recent 13F filing period.
Frequently asked questions
MMSI ownershipMerit Medical Systems, Inc. (MMSI) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is TUDOR INVESTMENT CORP ET AL with a 59.18% stake. Company insiders hold 2.46%. Data sourced from SEC Form 13F as of September 30, 2025.