Vault-13

MASIMO CORP MASI

COM · Common Stock · CUSIP 574795100 · ISIN US5747951003

353 institutional holders +12 vs Q1 2024
49,640,55149.6m shares reported held*
$6.3bnreported value*
53 new 117 added 110 reduced 41 sold out net sold ≈ $420.6m (-3.3m 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 ($6.8m this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $125.92. Options: 15 managers hold calls ($37.3m notional), 13 hold puts ($39.2m).

Trends to Q2 2024

Institutional holders

Managers reporting a position, each quarter

0200400600Q3 22: 420Q4 22: 405Q1 23: 429Q2 23: 417Q3 23: 358Q4 23: 343Q1 24: 341Q2 24: 353353Q3 22Q1 23Q3 23Q1 24Q2 24
Numbers
QuarterHolders
Q3 2022420
Q4 2022405
Q1 2023429
Q2 2023417
Q3 2023358
Q4 2023343
Q1 2024341
Q2 2024353

Buyers vs sellers

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

Bought or addedCut or sold out
4000400Q4 22: 154 bought or addedQ4 22: 232 cut or sold outQ4 22Q1 23: 198 bought or addedQ1 23: 180 cut or sold outQ2 23: 159 bought or addedQ2 23: 229 cut or sold outQ2 23Q3 23: 139 bought or addedQ3 23: 276 cut or sold outQ4 23: 157 bought or addedQ4 23: 193 cut or sold outQ4 23Q1 24: 140 bought or addedQ1 24: 177 cut or sold outQ2 24: 170 bought or addedQ2 24: 151 cut or sold outQ2 24
Numbers
QuarterBought or addedCut or sold out
Q4 2022154232
Q1 2023198180
Q2 2023159229
Q3 2023139276
Q4 2023157193
Q1 2024140177
Q2 2024170151

Calls vs puts

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

CallsPuts
$0$100m$200m$300mQ3 23 calls: $208.1mQ3 23 puts: $58.0mQ3 23P/C 0.28Q4 23 calls: $132.7mQ4 23 puts: $53.0mQ4 23P/C 0.40Q1 24 calls: $31.1mQ1 24 puts: $42.0mQ1 24P/C 1.35Q2 24 calls: $37.3mQ2 24 puts: $39.2mQ2 24P/C 1.05
Numbers
QuarterCallsPutsP/C
Q3 2023$208.1m$58.0m0.28
Q4 2023$132.7m$53.0m0.40
Q1 2024$31.1m$42.0m1.35
Q2 2024$37.3m$39.2m1.05

Biggest buyers

BlackRock Inc. Added +1,470,865+1.5m
WESTFIELD CAPITAL MANAGEMENT CO LP Added +445,586+445.6k
MILLENNIUM MANAGEMENT LLC Added +406,727+406.7k
Thrivent Financial for Lutherans Added +360,497+360.5k
Point72 Asset Management, L.P. Added +351,523+351.5k
Man Group plc New +291,789+291.8k
Holocene Advisors, LP Added +259,036+259.0k
TWO SIGMA INVESTMENTS, LP New +250,956+251.0k
ExodusPoint Capital Management, LP New +202,304+202.3k
VANGUARD GROUP INC Added +181,498+181.5k

Biggest sellers

FMR LLC Reduced -2,191,546-2.2m
Capital Research Global Investors Reduced -1,212,110-1.2m
CITADEL ADVISORS LLC Reduced -1,117,726-1.1m
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Reduced -1,000,059-1.0m
MORGAN STANLEY Reduced -938,574-938.6k
JPMORGAN CHASE & CO Reduced -419,862-419.9k
MIG Capital, LLC Sold out -381,732-381.7k
FARALLON CAPITAL MANAGEMENT, L.L.C. Reduced -370,000-370.0k
Jackson Square Partners, LLC Sold out -296,458-296.5k
ArrowMark Colorado Holdings LLC Sold out -218,810-218.8k

Biggest calls

Caption Management, LLC Added $13.6m107.6k shares
PURA VIDA INVESTMENTS, LLC New $5.6m44.5k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced $5.0m39.9k shares
CITADEL ADVISORS LLC Reduced $3.2m25.2k shares
BOOTHBAY FUND MANAGEMENT, LLC New $3.2m25.1k shares
JANE STREET GROUP, LLC Added $3.1m24.4k shares
GROUP ONE TRADING LLC Added $1.2m9.9k shares
D. E. Shaw & Co., Inc. Unchanged $994.9k7.9k shares
JPMORGAN CHASE & CO Unchanged $478.6k3.8k shares
SIMPLEX TRADING, LLC Reduced $365.0k2.9k shares

Biggest puts

Caption Management, LLC New $8.9m70.3k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $7.8m62.3k shares
Twin Tree Management, LP Unchanged $6.5m51.8k shares
CAPITAL FUND MANAGEMENT S.A. Reduced $5.9m46.6k shares
CITADEL ADVISORS LLC Reduced $5.2m41.1k shares
JANE STREET GROUP, LLC Reduced $1.7m13.4k shares
D. E. Shaw & Co., Inc. Unchanged $1.3m10.0k shares
SIMPLEX TRADING, LLC Reduced $982.0k7.8k shares
Cubist Systematic Strategies, LLC Reduced $440.8k3.5k shares
MILLENNIUM MANAGEMENT LLC Reduced $289.7k2.3k shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

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 2024

#ManagerLocationShares Value% of their portfolioChangeShares change
1 BlackRock Inc. 0.03% of their portfolio New York, NY 9,351,2399.4m $1.2bn $1.2bn 0.03% Added +1.5m +1,470,865
2 FMR LLC 0.04% of their portfolio BOSTON, MA 4,785,7354.8m $602.7m $602.7m 0.04% Reduced -2.2m -2,191,546
3 VANGUARD GROUP INC 0.01% of their portfolio Valley Forge, PA 4,737,3514.7m $596.6m $596.6m 0.01% Added +181.5k +181,498
4 Politan Capital Management LP 36.18% of their portfolio NEW YORK, NY 4,714,7464.7m $593.8m $593.8m 36.18% Added +1.2k +1,228
5 RTW INVESTMENTS, LP 2.85% of their portfolio NEW YORK, NY 1,462,4001.5m $184.2m $184.2m 2.85% Unchanged
6 STATE STREET CORP 0.01% of their portfolio BOSTON, MA 1,428,6351.4m $179.9m $179.9m 0.01% Added +68.3k +68,313
7 Thrivent Financial for Lutherans 0.31% of their portfolio Minneapolis, MN 1,217,3571.2m $153.3m $153.3m 0.31% Added +360.5k +360,497
8 T. Rowe Price Investment Management, Inc. 0.09% of their portfolio BALTIMORE, MD 1,154,3511.2m $145.4m $145.4m 0.09% Reduced -50.7k -50,712
9 WESTFIELD CAPITAL MANAGEMENT CO LP 0.70% of their portfolio BOSTON, MA 1,131,6861.1m $142.5m $142.5m 0.70% Added +445.6k +445,586
10 FARALLON CAPITAL MANAGEMENT, L.L.C. 0.83% of their portfolio SAN FRANCISCO, CA 1,119,5631.1m $141.0m $141.0m 0.83% Reduced -370.0k -370,000
11 Ace Management Global Ltd. 39.24% of their portfolio SAO PAULO, D5 1,060,9191.1m $133.6m $133.6m 39.24% Reduced -108.4k -108,433
12 Capital Research Global Investors 0.03% of their portfolio Los Angeles, CA 1,057,1361.1m $133.1m $133.1m 0.03% Reduced -1.2m -1,212,110
13 Holocene Advisors, LP 0.55% of their portfolio New York, NY 1,037,4501.0m $130.7m $130.7m 0.55% Added +259.0k +259,036
14 Liontrust Investment Partners LLP 1.45% of their portfolio LONDON, X0 808,693808.7k $101.8m $101.8m 1.45% Reduced -16.8k -16,836
15 GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio BOSTON, MA 780,902780.9k $98.4m $98.4m 0.01% Added +26.7k +26,742
16 MILLENNIUM MANAGEMENT LLC 0.08% of their portfolio NEW YORK, NY 753,743753.7k $94.9m $94.9m 0.08% Added +406.7k +406,727
17 MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.03% of their portfolio Boston, MA 721,726721.7k $90.9m $90.9m 0.03% Reduced -1.0m -1,000,059
18 Point72 Asset Management, L.P. 0.28% of their portfolio STAMFORD, CT 677,677677.7k $85.3m $85.3m 0.28% Added +351.5k +351,523
19 SCHRODER INVESTMENT MANAGEMENT GROUP 0.07% of their portfolio London, X0 528,623528.6k $66.6m $66.6m 0.07% Added +1.3k +1,287
20 DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio AUSTIN, TX 525,594525.6k $66.2m $66.2m 0.02% Added +165.3k +165,257
21 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 475,803475.8k $59.9m $59.9m 0.00% Reduced -938.6k -938,574
22 Alyeska Investment Group, L.P. 0.31% of their portfolio CHICAGO, IL 430,931430.9k $54.3m $54.3m 0.31% Added +51.5k +51,512
23 Ensemble Capital Management, LLC 3.99% of their portfolio San Francisco, CA 407,102407.1k $51.3m $51.3m 3.99% Added +40.8k +40,767
24 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio SAN FRANCISCO, CA 393,288393.3k $49.5m $49.5m 0.01% Added +14.9k +14,913
25 Sumitomo Mitsui Trust Group, Inc. 0.04% of their portfolio CHIYODA-KU, TOKYO, M0 391,026391.0k $49.2m $49.2m 0.04% Reduced -863 -863
26 Bank of New York Mellon Corp 0.01% of their portfolio NEW YORK, NY 389,764389.8k $49.1m $49.1m 0.01% Reduced -1.2k -1,161
27 BAMCO INC /NY/ 0.13% of their portfolio NEW YORK, NY 347,200347.2k $43.7m $43.7m 0.13% Added +1.4k +1,400
28 NORTHERN TRUST CORP 0.01% of their portfolio CHICAGO, IL 317,303317.3k $40.0m $40.0m 0.01% Added +39.9k +39,852
29 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 296,254296.3k $37.3m $37.3m 0.00% Reduced -419.9k -419,862
30 Man Group plc 0.10% of their portfolio LONDON, X0 291,789291.8k $36.7m $36.7m 0.10% New
31 TWO SIGMA INVESTMENTS, LP 0.07% of their portfolio NEW YORK, NY 250,956251.0k $31.6m $31.6m 0.07% New
32 CITADEL ADVISORS LLC 0.03% of their portfolio MIAMI, FL 227,490227.5k $28.7m $28.7m 0.03% Reduced -1.1m -1,117,726
33 ExodusPoint Capital Management, LP 0.28% of their portfolio NEW YORK, NY 202,304202.3k $25.5m $25.5m 0.28% New
34 COMERICA BANK 0.10% of their portfolio DALLAS, TX 190,685190.7k $24.0m $24.0m 0.10% Added +88.0k +87,990
35 Woodline Partners LP 0.22% of their portfolio San Francisco, CA 185,990186.0k $23.4m $23.4m 0.22% Added +132.8k +132,844
36 RAYMOND JAMES & ASSOCIATES 0.01% of their portfolio ST PETERSBURG, FL 180,533180.5k $22.7m $22.7m 0.01% Reduced -1.1k -1,078
37 PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio DES MOINES, IA 148,651148.7k $18.7m $18.7m 0.01% Reduced -19.1k -19,097
38 Retirement Systems of Alabama 0.07% of their portfolio MONTGOMERY, AL 144,238144.2k $18.2m $18.2m 0.07% Reduced -700 -700
39 Balyasny Asset Management L.P. 0.04% of their portfolio Chicago, IL 135,719135.7k $17.1m $17.1m 0.04% Reduced -119.8k -119,789
40 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 135,090135.1k $17.0m $17.0m 0.00% Added +12.6k +12,637
41 FEDERATED HERMES, INC. 0.04% of their portfolio PITTSBURGH, PA 134,261134.3k $16.9m $16.9m 0.04% Reduced -21.1k -21,124
42 Rockefeller Capital Management L.P. 0.05% of their portfolio NEW YORK, NY 131,852131.9k $16.6m $16.6m 0.05% Added +15.2k +15,179
43 RHUMBLINE ADVISERS 0.02% of their portfolio BOSTON, MA 127,773127.8k $16.1m $16.1m 0.02% Reduced -5.4k -5,359
44 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio NEW YORK, NY 120,828120.8k $15.2m $15.2m 0.00% Added +37.6k +37,646
45 Nuveen Asset Management, LLC 0.00% of their portfolio CHICAGO, IL 115,722115.7k $14.6m $14.6m 0.00% Added +26.4k +26,364
46 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 115,029115.0k $14.5m $14.5m 0.00% Reduced -15.3k -15,261
47 TWO SIGMA ADVISERS, LP 0.03% of their portfolio NEW YORK, NY 111,600111.6k $14.1m $14.1m 0.03% Added +110.0k +110,000
48 NATIXIS 0.08% of their portfolio PARIS, I0 105,816105.8k $13.3m $13.3m 0.08% New
49 Senator Investment Group LP 0.61% of their portfolio New York, NY 100,000100.0k $12.6m $12.6m 0.61% Reduced -74.0k -74,000
50 ING GROEP NV 0.07% of their portfolio AMSTERDAM, P7 99,00099.0k $12.5m $12.5m 0.07% New
51 One Fin Capital Management LP 4.76% of their portfolio San Francisco, CA 95,00095.0k $12.0m $12.0m 4.76% New
52 MARSHALL WACE, LLP 0.02% of their portfolio LONDON, X0 94,79894.8k $11.9m $11.9m 0.02% Added +4.6k +4,591
53 Legal & General Group Plc 0.00% of their portfolio London, X0 93,10393.1k $11.7m $11.7m 0.00% Reduced -6.7k -6,670
54 AMERIPRISE FINANCIAL INC 0.00% of their portfolio MINNEAPOLIS, MN 91,78891.8k $11.6m $11.6m 0.00% Added +12.9k +12,907
55 Swiss National Bank 0.01% of their portfolio ZURICH, V8 88,50088.5k $11.1m $11.1m 0.01% Reduced -100 -100
56 Erste Asset Management GmbH 0.14% of their portfolio VIENNA, C4 85,00085.0k $10.7m $10.7m 0.14% Reduced -30.0k -30,000
57 GAMCO INVESTORS, INC. ET AL 0.12% of their portfolio GREENWICH, CT 84,50084.5k $10.6m $10.6m 0.12% Unchanged
58 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 83,05183.1k $10.5m $10.5m 0.00% Added +4.0k +4,011
59 Gotham Asset Management, LLC 0.13% of their portfolio NEW YORK, NY 80,75980.8k $10.2m $10.2m 0.13% Added +3.7k +3,661
60 FIRST TRUST ADVISORS LP 0.01% of their portfolio Wheaton, IL 79,40579.4k $10.0m $10.0m 0.01% Added +16.9k +16,879
61 FIL Ltd 0.01% of their portfolio HAMILTON, D0 76,14776.1k $9.6m $9.6m 0.01% Added +3.0k +2,960
62 California Public Employees Retirement System 0.01% of their portfolio Sacramento, CA 74,71374.7k $9.4m $9.4m 0.01% Added +13.1k +13,098
63 Susquehanna Portfolio Strategies, LLC 0.37% of their portfolio Bala Cynwyd, PA 71,78971.8k $9.0m $9.0m 0.37% Reduced -940 -940
64 PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio BALTIMORE, MD 68,28968.3k $8.6m $8.6m 0.00% Reduced -3.3k -3,259
65 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 61,91561.9k $7.8m $7.8m 0.00% Added +860 +860
66 Corebridge Financial, Inc. 0.04% of their portfolio HOUSTON, TX 56,66156.7k $7.1m $7.1m 0.04% First filing
67 Montanaro Asset Management Ltd 1.26% of their portfolio LONDON, X0 53,70053.7k $6.8m $6.8m 1.26% Reduced -53.4k -53,400
68 LOGAN CAPITAL MANAGEMENT INC 0.28% of their portfolio Newtown Square, PA 51,04551.0k $6.4m $6.4m 0.28% Reduced -68 -68
69 Assenagon Asset Management S.A. 0.02% of their portfolio SENNINGERBERG, N4 50,74050.7k $6.4m $6.4m 0.02% Added +43.9k +43,918
70 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 49,94849.9k $6.3m $6.3m 0.00% Reduced -17.4k -17,416
71 Wilmington Savings Fund Society, FSB 0.24% of their portfolio WILMINGTON, DE 49,28949.3k $6.2m $6.2m 0.24% Reduced -791 -791
72 NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio ALBANY, NY 49,04849.0k $6.2m $6.2m 0.01% Reduced -1.7k -1,700
73 NORGES BANK 0.00% of their portfolio OSLO, Q8 48,69548.7k $6.1m $6.1m 0.00% Added +14.3k +14,288
74 NATIONAL BANK OF CANADA /FI/ 0.01% of their portfolio MONTREAL, A8 44,82544.8k $5.2m $5.2m 0.01% New
75 CITIGROUP INC 0.01% of their portfolio NEW YORK, NY 44,72044.7k $5.6m $5.6m 0.01% Reduced -11.2k -11,203
76 UBS Group AG 0.00% of their portfolio ZURICH, V8 43,86143.9k $5.5m $5.5m 0.00% Added +109 +109
77 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio WEST SACRAMENTO, CA 43,76143.8k $5.5m $5.5m 0.01% Reduced -1.0k -1,032
78 STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio TALLAHASSEE, FL 42,90142.9k $5.4m $5.4m 0.01% Reduced -11.9k -11,938
79 NS Partners Ltd 0.24% of their portfolio LONDON, X0 42,05142.1k $5.3m $5.3m 0.24% Added +166 +166
80 LMR Partners LLP 0.11% of their portfolio LONDON, X0 40,35440.4k $5.1m $5.1m 0.11% New
81 NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio ALBANY, NY 37,74237.7k $4.8m $4.8m 0.01% Added +367 +367
82 MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio Toronto, A6 37,73537.7k $4.8m $4.8m 0.00% Reduced -542 -542
83 TD Asset Management Inc 0.00% of their portfolio Toronto, A6 33,86433.9k $4.3m $4.3m 0.00% Reduced -366 -366
84 APG Asset Management N.V. 0.01% of their portfolio Amsterdam, P7 33,28733.3k $3.9m $3.9m 0.01% Reduced -3.4k -3,382
85 GABELLI FUNDS LLC 0.03% of their portfolio Rye, NY 33,00033.0k $4.2m $4.2m 0.03% Unchanged
86 PEAK6 Investments LLC 0.19% of their portfolio CHICAGO, IL 32,34232.3k $4.1m $4.1m 0.19% Reduced -6.4k -6,416
87 South Dakota Investment Council 0.08% of their portfolio SIOUX FALLS, SD 30,61130.6k $3.9m $3.9m 0.08% Reduced -36 -36
88 Birchview Capital, LP 1.78% of their portfolio BURLINGTON, VT 30,56030.6k $3.8m $3.8m 1.78% Unchanged
89 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 29,60329.6k $3.7m $3.7m 0.00% Added +5.2k +5,239
90 Campbell & CO Investment Adviser LLC 0.31% of their portfolio BALTIMORE, MD 28,75028.8k $3.6m $3.6m 0.31% Added +25.9k +25,854
91 STOREBRAND ASSET MANAGEMENT AS 0.01% of their portfolio LYSAKER, Q8 28,01828.0k $3.5m $3.5m 0.01% Reduced -174 -174
92 HSBC HOLDINGS PLC 0.00% of their portfolio LONDON, X0 27,60927.6k $3.5m $3.5m 0.00% Added +21.9k +21,887
93 CANADA LIFE ASSURANCE Co 0.01% of their portfolio WINNIPEG, A2 27,41427.4k $3.5m $3.5m 0.01% Added +2.0k +1,968
94 BOOTHBAY FUND MANAGEMENT, LLC 0.11% of their portfolio NEW YORK, NY 27,39127.4k $3.4m $3.4m 0.11% Added +25.6k +25,648
95 ZACKS INVESTMENT MANAGEMENT 0.04% of their portfolio Chicago, IL 26,85426.9k $3.4m $3.4m 0.04% Added +1.8k +1,766
96 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 26,84126.8k $3.4m $3.4m 0.00% Added +295 +295
97 BROWN CAPITAL MANAGEMENT LLC 0.07% of their portfolio BALTIMORE, MD 26,81126.8k $3.4m $3.4m 0.07% Reduced -33 -33
98 Westmount Partners, LLC 1.00% of their portfolio LOS ANGELES, CA 25,99126.0k $3.0m $3.0m 1.00% Reduced -433 -433
99 MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC 0.04% of their portfolio New York, NY 25,53225.5k $3.2m $3.2m 0.04% Reduced -915 -915
100 CenterBook Partners LP 0.20% of their portfolio GREENWICH, CT 25,29325.3k $3.2m $3.2m 0.20% Reduced -16.0k -16,020