§ HEALTH CARE
USD · Health CareMASI
MASIMO CORP
USDSector · Health CareMarket cap · $9.3BBeta · 1.21
§ 01 · PRICE
Price action
1D5D1M6MYTD1YMAX
§ 03 · SIGNAL STACK · WHAT THE INPUTS SAY
13F FLOW
272 increased/new, 106 decreased/exited (13F)
AC 13F Analysis
§ 04 · FUNDAMENTALS · THE BOOKS
| P/B | 9.98 | EPS (TTM) | -2.77 |
§ 05 · WHO OWNS IT
Top institutional holders
| Fund | Shares | % port | Δ Q/Q |
|---|---|---|---|
| Politan Capital Management LP | 4.6M | 82.9% | ±0% |
| Pentwater Capital Management LP | 3.2M | 2.9% | n/a |
| BlackRock, Inc. | 2.9M | 0.0% | −48% |
| HBK INVESTMENTS L P | 2.6M | 4.6% | n/a |
| Barclays PLC | 2.5M | 0.1% | +4602% |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.1M | 0.0% | n/a |
◇ AC INTELLIGENCE
Top institutional owners for MASI as of the most recent 13F reporting period (Q1 2026 · Period ended Mar 31). Δ Q/Q reflects share-count change vs. the prior filing — positive green means adding, negative red means trimming. Cross-reference with the ownership-mix bars below to see which strategy cohort is driving the flow.
§ 06 · WHO OWNS IT · BY STRATEGY
OTHER57.2% · 333 holders
DEALER / BANK18.4% · 35 holders
QUALITY / COMPOUNDER12.9% · 23 holders
PASSIVE / INDEX12.0% · 10 holders
TACTICAL / MACRO6.2% · 7 holders
SYSTEMATIC / QUANT2.7% · 11 holders
INCOME / DEFENSIVE1.3% · 30 holders
DEEP VALUE0.3% · 1 holder
ACTIVIST0.0% · 1 holder
◇ AC INTELLIGENCE
Ownership mix by behavioral cohort. Top bars indicate which style of capital dominates the float — passive indexing, quality compounders, dealer/bank, systematic quant, etc. Big quality-compounder share means concentrated active conviction; heavy passive share means flows are dictated by index rebalances, not fundamentals.
§ 07 · INSIDER ACTIVITY · LAST 180 DAYS
NO INSIDER FILINGS
◇ AC INTELLIGENCE
No Form 4 filings on record for MASI in the last 180 days.
§ 08 · COVERAGE · OUR RECENT NOTES
No notes mention MASI yet.