352 tracked 13F filers disclose a position in MMSI as of the latest SEC 13F filings, a combined $4.0B in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $608.9M | 8.8M | ▲+1.5% Added · +131K sh | Q1 2026 | |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | $242.8M | 3.5M | →First observed position No prior filed position | Q1 2026 | |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $183.1M | 2.7M | →First observed position No prior filed position | Q1 2026 | |
| 4 | STATE STREET CORP | $171.6M | 2.5M | ▲+4.8% Added · +114K sh | Q2 2026 | |
| 5 | Conestoga Capital Advisors, LLC | $137.3M | 2.0M | ▼−8.7% Reduced · −188K sh | Q2 2026 | |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | $112.8M | 1.6M | ▲+7.8% Added · +118K sh | Q2 2026 | |
| 7 | FULLER & THALER ASSET MANAGEMENT, INC. | $111.8M | 1.6M | ▼−24% Reduced · −503K sh | Q2 2026 | |
| 8 | MORGAN STANLEY | $86.9M | 1.3M | ▲+11% Added · +121K sh | Q1 2026 | |
| 9 | DIMENSIONAL FUND ADVISORS LP | $85.3M | 1.2M | ▲+1.0% Added · +12K sh | Q1 2026 | |
| 10 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | $78.9M | 1.1M | ▲+46% Added · +360K sh | Q2 2026 | |
| 11 | Greenhouse Funds LLLP | $77.4M | 1.1M | ▲+29% Added · +255K sh | Q1 2026 | |
| 12 | CITIGROUP INC | $73.3M | 1.1M | ▲+0.3% Added · +4K sh | Q1 2026 | |
| 13 | CONGRESS ASSET MANAGEMENT CO | $70.9M | 1.0M | ▲+20% Added · +172K sh | Q1 2026 | |
| 14 | FMR LLC | $69.3M | 1.0M | ▼−43% Reduced · −767K sh | Q1 2026 | |
| 15 | CITADEL ADVISORS LLC | $66.4M | 963K | ▼−12% Reduced · −131K sh | Q1 2026 | |
| 16 | WESTWOOD HOLDINGS GROUP INC | $65.2M | 946K | ▲+15% Added · +120K sh | Q1 2026 | |
| 17 | ROYAL BANK OF CANADA | $63.5M | 921K | ▼−4.7% Reduced · −45K sh | Q1 2026 | |
| 18 | NORGES BANK | $76.0M | 862K | ▲+50% Added · +287K sh | Q4 2025 | |
| 19 | Point72 Asset Management, L.P. | $51.1M | 742K | ▲+70% Added · +305K sh | Q1 2026 | |
| 20 | MAVERICK CAPITAL LTD | $49.2M | 714K | ▲+47% Added · +228K sh | Q1 2026 | |
| 21 | NORTHERN TRUST CORP | $47.0M | 682K | ▲+0.2% Added · +2K sh | Q1 2026 | |
| 22 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $46.6M | 675K | ▲+0.5% Added · +3K sh | Q1 2026 | |
| 23 | PRICE T ROWE ASSOCIATES INC /MD/ | $45.1M | 655K | ▲+1.6% Added · +10K sh | Q1 2026 | |
| 24 | GOLDMAN SACHS GROUP INC | $44.7M | 648K | ▼−32% Reduced · −300K sh | Q1 2026 | |
| 25 | JPMORGAN CHASE & CO | $42.4M | 617K | ▼−20% Reduced · −153K sh | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
Last quarter, 5 funds opened a new position in MMSI and 36 added to an existing one, while 20 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 201 funds | $242.1B |
| ALPHABET INC-CL AGOOGL | 194 funds | $143.7B |
| META PLATFORMS INC-CLASS AMETA | 194 funds | $100.7B |
| NVIDIA CORPNVDA | 193 funds | $357.1B |
| APPLE INCAAPL | 193 funds | $267.5B |
| AMAZON.COM INCAMZN | 193 funds | $182.1B |
| ELI LILLY & COLLY | 189 funds | $68.7B |
| JPMORGAN CHASE & COJPM | 189 funds | $58.0B |
| MICRON TECHNOLOGY INCMU | 187 funds | $37.9B |
| COSTCO WHOLESALE CORPCOST | 187 funds | $33.7B |
| BROADCOM INCAVGO | 185 funds | $139.1B |
| ALPHABET INC-CL CGOOG | 184 funds | $112.1B |
Ranked by how many of MMSI's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 24, 2026 | Peterson Neil W. | CHIEF OPERATING OFFICER | Sell (S) | 8K | $678K |
| Aug 4, 2026 | Peterson Neil W. | CHIEF OPERATING OFFICER | Sell (S) | 21K | $1.8M |
| May 11, 2026 | Smith Christian Adam | Chief Commercial Officer | Buy (P) | 2K | $99K |
| May 7, 2026 | Ward Lynne N. | Director | Sell (S) | 5K | $313K |
| May 7, 2026 | Lloyd Brian G. | CHIEF LEGAL OFFICER, SECRETARY | Buy (P) | 2K | $125K |
| May 6, 2026 | Aronson Martha Goldberg | President and CEO, Director | Buy (P) | 2K | $121K |
| May 6, 2026 | Parra Raul Jr. | CFO AND TREASURER | Buy (P) | 2K | $92K |
| May 5, 2026 | Voigt Michel J. | CHIEF HUMAN RESOURCES OFFICER | Buy (P) | 2K | $136K |
| Jan 6, 2026 | Peterson Neil W. | CHIEF OPERATING OFFICER | Sell (S) | 5K | $450K |
| Nov 25, 2025 | Lampropoulos Fred P. | Executive Chairman, Director | Sell (S) | 10K | $880K |
| Nov 21, 2025 | Lampropoulos Fred P. | Executive Chairman, Director | Sell (S) | 25K | $2.2M |
| Nov 20, 2025 | Lampropoulos Fred P. | Executive Chairman, Director | Sell (S) | 20K | $1.7M |
| Class | 13F holders | Value held |
|---|---|---|
| MMSIthis pagecs | 352 funds | $4.0B |
| 589889AB0NOTE 3.000% 2/0 | 20 funds | $258.7M |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for MMSI
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/MMSI/capital-change-brief"
Use Arkolith's capital_change_brief for MMSI. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for MMSI. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.