Vault-13

MASIMO CORP MASI

COM · Common Stock · CUSIP 574795100 · ISIN US5747951003

363 institutional holders +10 vs Q2 2024
50,618,73550.6m shares reported held*
$6.7bnreported value*
59 new 110 added 123 reduced 47 sold out net bought ≈ $202.3m (+1.5m 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 ($203.7k this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $133.21. Options: 15 managers hold calls ($117.3m notional), 14 hold puts ($43.0m).

Trends to Q3 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: 353Q3 24: 363363Q3 22Q1 23Q3 23Q1 24Q3 24
Numbers
QuarterHolders
Q3 2022420
Q4 2022405
Q1 2023429
Q2 2023417
Q3 2023358
Q4 2023343
Q1 2024341
Q2 2024353
Q3 2024363

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 outQ1 23: 198 bought or addedQ1 23: 180 cut or sold outQ1 23Q2 23: 159 bought or addedQ2 23: 229 cut or sold outQ3 23: 139 bought or addedQ3 23: 276 cut or sold outQ3 23Q4 23: 157 bought or addedQ4 23: 193 cut or sold outQ1 24: 140 bought or addedQ1 24: 177 cut or sold outQ1 24Q2 24: 170 bought or addedQ2 24: 151 cut or sold outQ3 24: 169 bought or addedQ3 24: 170 cut or sold outQ3 24
Numbers
QuarterBought or addedCut or sold out
Q4 2022154232
Q1 2023198180
Q2 2023159229
Q3 2023139276
Q4 2023157193
Q1 2024140177
Q2 2024170151
Q3 2024169170

Calls vs puts

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

CallsPuts
$0$50m$100m$150mQ4 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 1.05Q3 24 calls: $117.3mQ3 24 puts: $43.0mQ3 24P/C 0.37
Numbers
QuarterCallsPutsP/C
Q4 2023$132.7m$53.0m0.40
Q1 2024$31.1m$42.0m1.35
Q2 2024$37.3m$39.2m1.05
Q3 2024$117.3m$43.0m0.37

Biggest buyers

FMR LLC Added +1,970,883+2.0m
T. Rowe Price Investment Management, Inc. Added +372,137+372.1k
Alyeska Investment Group, L.P. Added +314,196+314.2k
Capital Research Global Investors Added +303,192+303.2k
WESTFIELD CAPITAL MANAGEMENT CO LP Added +262,370+262.4k
MORGAN STANLEY Added +261,053+261.1k
NORGES BANK Added +206,693+206.7k
SCHRODER INVESTMENT MANAGEMENT GROUP Added +203,998+204.0k
GOLDMAN SACHS GROUP INC Added +196,986+197.0k
CRAMER ROSENTHAL MCGLYNN LLC Added +166,936+166.9k

Biggest sellers

Thrivent Financial for Lutherans Reduced -1,206,984-1.2m
MILLENNIUM MANAGEMENT LLC Reduced -724,490-724.5k
Point72 Asset Management, L.P. Sold out -677,677-677.7k
VANGUARD GROUP INC Reduced -216,864-216.9k
ExodusPoint Capital Management, LP Sold out -202,304-202.3k
Woodline Partners LP Reduced -176,690-176.7k
Holocene Advisors, LP Reduced -162,291-162.3k
Balyasny Asset Management L.P. Sold out -135,719-135.7k
Ace Management Global Ltd. Reduced -95,415-95.4k
One Fin Capital Management LP Sold out -95,000-95.0k

Biggest calls

JPMORGAN CHASE & CO Added $73.9m554.6k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $10.5m78.5k shares
Point72 Asset Management, L.P. New $8.0m60.0k shares
Caption Management, LLC Reduced $4.5m33.5k shares
MILLENNIUM MANAGEMENT LLC New $4.1m30.4k shares
CITADEL ADVISORS LLC Added $4.0m29.8k shares
JANE STREET GROUP, LLC Added $3.8m28.6k shares
WOLVERINE TRADING, LLC New $2.2m16.4k shares
GROUP ONE TRADING LLC Added $1.9m14.5k shares
CITIGROUP INC New $1.6m12.1k shares

Biggest puts

SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $10.1m75.7k shares
SIMPLEX TRADING, LLC Added $6.5m48.9k shares
CITIGROUP INC New $6.3m47.6k shares
PEAK6 Investments LLC New $4.8m35.9k shares
JANE STREET GROUP, LLC Added $4.7m35.6k shares
CITADEL ADVISORS LLC Reduced $4.6m34.4k shares
CAPITAL FUND MANAGEMENT S.A. Reduced $1.4m10.3k shares
GROUP ONE TRADING LLC Added $1.3m10.1k shares
D. E. Shaw & Co., Inc. Unchanged $1.3m10.0k shares
JPMORGAN CHASE & CO New $800.0k6.0k 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, Q3 2024

#ManagerLocationShares Value% of their portfolioChangeShares change
1 BlackRock, Inc. 0.02% of their portfolio New York, NY 8,822,2698.8m $1.2bn $1.2bn 0.02% First filing
2 FMR LLC 0.05% of their portfolio BOSTON, MA 6,756,6186.8m $900.9m $900.9m 0.05% Added +2.0m +1,970,883
3 Politan Capital Management LP 35.50% of their portfolio NEW YORK, NY 4,714,7464.7m $628.6m $628.6m 35.50% Unchanged
4 VANGUARD GROUP INC 0.01% of their portfolio Valley Forge, PA 4,520,4874.5m $602.7m $602.7m 0.01% Reduced -216.9k -216,864
5 T. Rowe Price Investment Management, Inc. 0.12% of their portfolio BALTIMORE, MD 1,526,4881.5m $203.5m $203.5m 0.12% Added +372.1k +372,137
6 RTW INVESTMENTS, LP 2.82% of their portfolio NEW YORK, NY 1,462,4001.5m $195.0m $195.0m 2.82% Unchanged
7 STATE STREET CORP 0.01% of their portfolio BOSTON, MA 1,438,8141.4m $191.8m $191.8m 0.01% Added +10.2k +10,179
8 WESTFIELD CAPITAL MANAGEMENT CO LP 0.84% of their portfolio BOSTON, MA 1,394,0561.4m $185.9m $185.9m 0.84% Added +262.4k +262,370
9 Capital Research Global Investors 0.04% of their portfolio Los Angeles, CA 1,360,3281.4m $181.4m $181.4m 0.04% Added +303.2k +303,192
10 FARALLON CAPITAL MANAGEMENT, L.L.C. 0.92% of their portfolio SAN FRANCISCO, CA 1,258,5631.3m $167.8m $167.8m 0.92% Added +139.0k +139,000
11 Ace Management Global Ltd. 38.42% of their portfolio SAO PAULO, D5 965,504965.5k $128.7m $128.7m 38.42% Reduced -95.4k -95,415
12 Holocene Advisors, LP 0.47% of their portfolio New York, NY 875,159875.2k $116.7m $116.7m 0.47% Reduced -162.3k -162,291
13 Liontrust Investment Partners LLP 1.45% of their portfolio LONDON, X0 808,693808.7k $101.8m $101.8m 1.45% Unchanged
14 GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio BOSTON, MA 792,886792.9k $105.7m $105.7m 0.01% Added +12.0k +11,984
15 MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.03% of their portfolio Boston, MA 792,166792.2k $105.6m $105.6m 0.03% Added +70.4k +70,440
16 Alyeska Investment Group, L.P. 0.51% of their portfolio CHICAGO, IL 745,127745.1k $99.3m $99.3m 0.51% Added +314.2k +314,196
17 MORGAN STANLEY 0.01% of their portfolio NEW YORK, NY 736,856736.9k $98.2m $98.2m 0.01% Added +261.1k +261,053
18 SCHRODER INVESTMENT MANAGEMENT GROUP 0.10% of their portfolio London, X0 732,621732.6k $97.6m $97.6m 0.10% Added +204.0k +203,998
19 DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio AUSTIN, TX 597,698597.7k $79.7m $79.7m 0.02% Added +72.1k +72,104
20 Man Group plc 0.15% of their portfolio LONDON, X0 399,945399.9k $53.3m $53.3m 0.15% Added +108.2k +108,156
21 Sumitomo Mitsui Trust Group, Inc. 0.03% of their portfolio CHIYODA-KU, TOKYO, M0 372,183372.2k $49.6m $49.6m 0.03% Reduced -18.8k -18,843
22 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio SAN FRANCISCO, CA 370,028370.0k $49.3m $49.3m 0.01% Reduced -23.3k -23,260
23 BAMCO INC /NY/ 0.12% of their portfolio NEW YORK, NY 347,200347.2k $46.3m $46.3m 0.12% Unchanged
24 TWO SIGMA INVESTMENTS, LP 0.10% of their portfolio NEW YORK, NY 342,827342.8k $45.7m $45.7m 0.10% Added +91.9k +91,871
25 Bank of New York Mellon Corp 0.01% of their portfolio NEW YORK, NY 341,960342.0k $45.6m $45.6m 0.01% Reduced -47.8k -47,804
26 Ensemble Capital Management, LLC 3.85% of their portfolio San Francisco, CA 340,355340.4k $45.4m $45.4m 3.85% Reduced -66.7k -66,747
27 GOLDMAN SACHS GROUP INC 0.01% of their portfolio NEW YORK, NY 332,076332.1k $44.3m $44.3m 0.01% Added +197.0k +196,986
28 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 311,706311.7k $41.6m $41.6m 0.00% Added +15.5k +15,452
29 NORTHERN TRUST CORP 0.01% of their portfolio CHICAGO, IL 301,041301.0k $40.1m $40.1m 0.01% Reduced -16.3k -16,262
30 NORGES BANK 0.00% of their portfolio OSLO, Q8 255,388255.4k $34.1m $34.1m 0.00% Added +206.7k +206,693
31 COMERICA BANK 0.13% of their portfolio DALLAS, TX 245,081245.1k $32.7m $32.7m 0.13% Added +54.4k +54,396
32 ING GROEP NV 0.19% of their portfolio AMSTERDAM, P7 240,900240.9k $32.1m $32.1m 0.19% Added +141.9k +141,900
33 TWO SIGMA ADVISERS, LP 0.07% of their portfolio NEW YORK, NY 218,600218.6k $29.1m $29.1m 0.07% Added +107.0k +107,000
34 AMERIPRISE FINANCIAL INC 0.01% of their portfolio MINNEAPOLIS, MN 199,861199.9k $26.6m $26.6m 0.01% Added +108.1k +108,073
35 CITADEL ADVISORS LLC 0.03% of their portfolio MIAMI, FL 189,549189.5k $25.3m $25.3m 0.03% Reduced -37.9k -37,941
36 CRAMER ROSENTHAL MCGLYNN LLC 1.37% of their portfolio STAMFORD, CT 185,017185.0k $24.7m $24.7m 1.37% Added +166.9k +166,936
37 RAYMOND JAMES & ASSOCIATES 0.01% of their portfolio ST PETERSBURG, FL 175,050175.1k $23.3m $23.3m 0.01% Reduced -5.5k -5,483
38 Clearline Capital LP 1.89% of their portfolio NEW YORK, NY 160,029160.0k $21.3m $21.3m 1.89% New
39 Gotham Asset Management, LLC 0.21% of their portfolio NEW YORK, NY 153,486153.5k $20.5m $20.5m 0.21% Added +72.7k +72,727
40 Rockefeller Capital Management L.P. 0.05% of their portfolio NEW YORK, NY 137,393137.4k $18.3m $18.3m 0.05% Added +5.5k +5,541
41 NATIONAL BANK OF CANADA /FI/ 0.02% of their portfolio MONTREAL, A8 132,500132.5k $17.7m $17.7m 0.02% Added +87.7k +87,675
42 RHUMBLINE ADVISERS 0.02% of their portfolio BOSTON, MA 127,014127.0k $16.9m $16.9m 0.02% Reduced -759 -759
43 FEDERATED HERMES, INC. 0.03% of their portfolio PITTSBURGH, PA 118,615118.6k $15.8m $15.8m 0.03% Reduced -15.6k -15,646
44 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 117,845117.8k $15.7m $15.7m 0.00% Added +2.8k +2,816
45 Retirement Systems of Alabama 0.06% of their portfolio MONTGOMERY, AL 114,260114.3k $15.2m $15.2m 0.06% Reduced -30.0k -29,978
46 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio NEW YORK, NY 112,471112.5k $15.0m $15.0m 0.00% Reduced -8.4k -8,357
47 FIL Ltd 0.01% of their portfolio HAMILTON, D0 105,708105.7k $14.1m $14.1m 0.01% Added +29.6k +29,561
48 CANADA PENSION PLAN INVESTMENT BOARD 0.01% of their portfolio TORONTO ONTARIO, A6 104,300104.3k $13.9m $13.9m 0.01% New
49 PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio DES MOINES, IA 102,507102.5k $13.7m $13.7m 0.01% Reduced -46.1k -46,144
50 Twin Tree Management, LP 0.29% of their portfolio DALLAS, TX 94,41694.4k $12.6m $12.6m 0.29% New
51 Legal & General Group Plc 0.00% of their portfolio London, X0 94,06594.1k $12.5m $12.5m 0.00% Added +962 +962
52 Swiss National Bank 0.01% of their portfolio ZURICH, V8 88,30088.3k $11.8m $11.8m 0.01% Reduced -200 -200
53 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 85,15885.2k $11.4m $11.4m 0.00% Added +2.1k +2,107
54 GAMCO INVESTORS, INC. ET AL 0.12% of their portfolio GREENWICH, CT 84,50084.5k $11.3m $11.3m 0.12% Unchanged
55 Nuveen Asset Management, LLC 0.00% of their portfolio CHICAGO, IL 83,72783.7k $11.2m $11.2m 0.00% Reduced -32.0k -31,995
56 California Public Employees Retirement System 0.01% of their portfolio Sacramento, CA 73,31373.3k $9.8m $9.8m 0.01% Reduced -1.4k -1,400
57 PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio BALTIMORE, MD 69,71669.7k $9.3m $9.3m 0.00% Added +1.4k +1,427
58 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 68,80468.8k $9.2m $9.2m 0.00% Added +6.9k +6,889
59 CITIGROUP INC 0.01% of their portfolio NEW YORK, NY 62,08862.1k $8.3m $8.3m 0.01% Added +17.4k +17,368
60 Montanaro Asset Management Ltd 1.32% of their portfolio LONDON, X0 55,70055.7k $7.4m $7.4m 1.32% Added +2.0k +2,000
61 Erste Asset Management GmbH 0.09% of their portfolio VIENNA, C4 55,00055.0k $7.3m $7.3m 0.09% Reduced -30.0k -30,000
62 UBS Group AG 0.00% of their portfolio ZURICH, V8 54,68254.7k $7.3m $7.3m 0.00% Added +10.8k +10,821
63 CAPITAL FUND MANAGEMENT S.A. 0.08% of their portfolio PARIS, I0 53,72653.7k $7.2m $7.2m 0.08% Added +30.2k +30,187
64 Squarepoint Ops LLC 0.02% of their portfolio NEW YORK, NY 53,22653.2k $7.1m $7.1m 0.02% Added +43.5k +43,540
65 Corebridge Financial, Inc. 0.04% of their portfolio HOUSTON, TX 52,46652.5k $7.0m $7.0m 0.04% Reduced -4.2k -4,195
66 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 51,59851.6k $6.9m $6.9m 0.00% Added +1.6k +1,650
67 LOGAN CAPITAL MANAGEMENT INC 0.28% of their portfolio Newtown Square, PA 50,35250.4k $6.7m $6.7m 0.28% Reduced -693 -693
68 Wilmington Savings Fund Society, FSB 0.12% of their portfolio WILMINGTON, DE 49,06449.1k $6.5m $6.5m 0.12% Reduced -225 -225
69 HRT FINANCIAL LP 0.03% of their portfolio NEW YORK, NY 48,00948.0k $6.4m $6.4m 0.03% Added +24.6k +24,644
70 NOMURA HOLDINGS INC 0.05% of their portfolio TOKYO, M0 47,58447.6k $6.3m $6.3m 0.05% New
71 TD Asset Management Inc 0.01% of their portfolio Toronto, A6 46,30846.3k $6.2m $6.2m 0.01% Added +12.4k +12,444
72 NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio ALBANY, NY 45,44845.4k $6.1m $6.1m 0.01% Reduced -3.6k -3,600
73 Walleye Capital LLC 0.06% of their portfolio NEW YORK, NY 44,87544.9k $6.0m $6.0m 0.06% Added +44.1k +44,133
74 NS Partners Ltd 0.24% of their portfolio LONDON, X0 43,03743.0k $5.7m $5.7m 0.24% Added +986 +986
75 STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio TALLAHASSEE, FL 42,90142.9k $5.7m $5.7m 0.01% Unchanged
76 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio WEST SACRAMENTO, CA 42,61242.6k $5.7m $5.7m 0.01% Reduced -1.1k -1,149
77 Sterling Capital Management LLC 0.07% of their portfolio CHARLOTTE, NC 40,93940.9k $5.5m $5.5m 0.07% First filing
78 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 39,95740.0k $5.3m $5.3m 0.00% Added +24.1k +24,137
79 PEAK6 Investments LLC 0.26% of their portfolio CHICAGO, IL 39,51539.5k $5.3m $5.3m 0.26% Added +7.2k +7,173
80 CANADA LIFE ASSURANCE Co 0.01% of their portfolio WINNIPEG, A2 37,56037.6k $5.0m $5.0m 0.01% Added +10.1k +10,146
81 MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio Toronto, A6 36,52636.5k $4.9m $4.9m 0.00% Reduced -1.2k -1,209
82 BANK OF NOVA SCOTIA 0.01% of their portfolio TORONTO, A6 35,43835.4k $4.7m $4.7m 0.01% New
83 Roubaix Capital, LLC 2.50% of their portfolio DENVER, CO 34,04134.0k $4.5m $4.5m 2.50% Added +9.2k +9,202
84 Susquehanna Portfolio Strategies, LLC 0.31% of their portfolio Bala Cynwyd, PA 33,99534.0k $4.5m $4.5m 0.31% Reduced -37.8k -37,794
85 GABELLI FUNDS LLC 0.03% of their portfolio Rye, NY 33,00033.0k $4.4m $4.4m 0.03% Unchanged
86 HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.01% of their portfolio TORONTO, A6 30,90030.9k $4.1m $4.1m 0.01% New
87 South Dakota Investment Council 0.08% of their portfolio SIOUX FALLS, SD 30,61130.6k $4.1m $4.1m 0.08% Unchanged
88 Birchview Capital, LP 1.77% of their portfolio BURLINGTON, VT 30,56030.6k $4.1m $4.1m 1.77% Unchanged
89 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 29,25329.3k $3.9m $3.9m 0.00% Reduced -724.5k -724,490
90 SG Americas Securities, LLC 0.01% of their portfolio NEW YORK, NY 28,96729.0k $3.9m $3.9m 0.01% New
91 SEI INVESTMENTS CO 0.00% of their portfolio OAKS, PA 28,08228.1k $3.7m $3.7m 0.00% Added +4.5k +4,488
92 ZACKS INVESTMENT MANAGEMENT 0.03% of their portfolio Chicago, IL 26,55826.6k $3.5m $3.5m 0.03% Reduced -296 -296
93 ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio Berwyn, PA 26,52826.5k $3.5m $3.5m 0.00% Added +4.2k +4,225
94 NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio ALBANY, NY 26,16326.2k $3.5m $3.5m 0.00% Reduced -11.6k -11,579
95 Westmount Partners, LLC 1.04% of their portfolio LOS ANGELES, CA 25,99126.0k $3.5m $3.5m 1.04% Unchanged
96 STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio MADISON, WI 25,14125.1k $3.4m $3.4m 0.01% Added +6.7k +6,684
97 Troluce Capital Advisors LLC 0.60% of their portfolio DORADO, PR 25,00025.0k $3.3m $3.3m 0.60% New
98 JANE STREET GROUP, LLC 0.01% of their portfolio NEW YORK, NY 24,68024.7k $3.3m $3.3m 0.01% Reduced -4.9k -4,923
99 D. E. Shaw & Co., Inc. 0.00% of their portfolio New York, NY 24,35824.4k $3.2m $3.2m 0.00% New
100 Amundi 0.00% of their portfolio Paris, I0 24,03524.0k $3.4m $3.4m 0.00% New