Vault-13

MASIMO CORP MASI

COM · Common Stock · CUSIP 574795100 · ISIN US5747951003

2 institutional holders -449 vs Q1 2026
9090 shares reported held*
$16.2kreported value*
0 new 0 added 2 reduced 435 sold out net sold ≈ $9.5bn (-53.1m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $179.96.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0200400600Q3 22: 420Q4 22: 405Q1 23: 429Q2 23: 417Q3 23: 358Q4 23: 343Q1 24: 341Q2 24: 353Q3 24: 363Q4 24: 367Q1 25: 394Q2 25: 380Q3 25: 358Q4 25: 392Q1 26: 451Q2 26: 22Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 2022420
Q4 2022405
Q1 2023429
Q2 2023417
Q3 2023358
Q4 2023343
Q1 2024341
Q2 2024353
Q3 2024363
Q4 2024367
Q1 2025394
Q2 2025380
Q3 2025358
Q4 2025392
Q1 2026451
Q2 20262

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
5000500Q3 24: 169 bought or addedQ3 24: 170 cut or sold outQ4 24: 162 bought or addedQ4 24: 169 cut or sold outQ4 24Q1 25: 206 bought or addedQ1 25: 161 cut or sold outQ2 25: 166 bought or addedQ2 25: 195 cut or sold outQ2 25Q3 25: 164 bought or addedQ3 25: 184 cut or sold outQ4 25: 174 bought or addedQ4 25: 182 cut or sold outQ4 25Q1 26: 259 bought or addedQ1 26: 178 cut or sold outQ2 26: 0 bought or addedQ2 26: 437 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 2024169170
Q4 2024162169
Q1 2025206161
Q2 2025166195
Q3 2025164184
Q4 2025174182
Q1 2026259178
Q2 20260437

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$100m$200m$300mQ3 25 calls: $5.5mQ3 25 puts: $5.5mQ3 25P/C 1.00Q4 25 calls: $3.6mQ4 25 puts: $8.4mQ4 25P/C 2.37Q1 26 calls: $275.7mQ1 26 puts: $25.3mQ1 26P/C 0.09Q2 26 calls: $0Q2 26 puts: $0Q2 26P/C —
Numbers
QuarterCallsPutsP/C
Q3 2025$5.5m$5.5m1.00
Q4 2025$3.6m$8.4m2.37
Q1 2026$275.7m$25.3m0.09
Q2 2026$0$0—

Biggest buyers

None

Biggest sellers

BlackRock, Inc. Sold out -4,644,578-4.6m
Politan Capital Management LP Sold out -4,589,648-4.6m
Pentwater Capital Management LP Sold out -3,176,000-3.2m
BARCLAYS PLC Sold out -2,743,985-2.7m
HBK INVESTMENTS L P Sold out -2,576,109-2.6m
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Sold out -2,342,790-2.3m
VANGUARD CAPITAL MANAGEMENT LLC Sold out -2,050,045-2.1m
VANGUARD PORTFOLIO MANAGEMENT LLC Sold out -2,006,861-2.0m
FMR LLC Sold out -1,450,823-1.5m
STATE STREET CORP Sold out -1,437,724-1.4m

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
BlackRock, Inc. 13G · institution filed 2025-02-07 7.9% 4.2m 2025-02-07
KIANI JOE E 13G · exempt (held before listing) -3.8 pts · filed 2026-05-14 6.5% -3.8 pts 3.7m 2026-05-14
BARCLAYS PLC 13G · institution new · filed 2026-05-14 5.5% new 2.9m 2026-05-14

Fell to 5% or below in the last year: Pentwater Capital Management LP (0.0%, 2026-08-14), Politan Capital Management LP (0.0%, 2026-06-11), BlackRock Portfolio Management LLC (0.2%, 2026-04-30; now reported by BlackRock, Inc.), VANGUARD GROUP INC (0.0%, 2026-03-27), FMR LLC (4.5%, 2026-03-06)

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 IFP Advisors, Inc 0.00% of their portfolio TAMPA, FL 8888 $15.8k $15.8k 0.00% Reduced -629 -629
2 HUNTINGTON NATIONAL BANK 0.00% of their portfolio COLUMBUS, OH 22 $360 $360 0.00% Reduced -2.2k -2,249