Vault-13

MASIMO CORP MASI

COM · Common Stock · CUSIP 574795100 · ISIN US5747951003

343 institutional holders -15 vs Q3 2023
51,188,24951.2m shares reported held*
$6.0bnreported value*
46 new 111 added 121 reduced 72 sold out net bought ≈ $444.5m (+3.8m 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 ($3.2m this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $117.21. Options: 22 managers hold calls ($132.7m notional), 14 hold puts ($53.0m).

Trends to Q4 2023

Institutional holders

Managers reporting a position, each quarter

0200400600Q3 22: 420Q4 22: 405Q1 23: 429Q2 23: 417Q3 23: 358Q4 23: 343343Q3 22Q4 22Q1 23Q2 23Q3 23Q4 23
Numbers
QuarterHolders
Q3 2022420
Q4 2022405
Q1 2023429
Q2 2023417
Q3 2023358
Q4 2023343

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 outQ1 23Q2 23: 159 bought or addedQ2 23: 229 cut or sold outQ2 23Q3 23: 139 bought or addedQ3 23: 276 cut or sold outQ3 23Q4 23: 157 bought or addedQ4 23: 193 cut or sold outQ4 23
Numbers
QuarterBought or addedCut or sold out
Q4 2022154232
Q1 2023198180
Q2 2023159229
Q3 2023139276
Q4 2023157193

Calls vs puts

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

CallsPuts
$0$100m$200m$300mQ1 23 calls: $31.6mQ1 23 puts: $13.2mQ1 23P/C 0.42Q2 23 calls: $31.2mQ2 23 puts: $6.4mQ2 23P/C 0.21Q3 23 calls: $208.1mQ3 23 puts: $58.0mQ3 23P/C 0.28Q4 23 calls: $132.7mQ4 23 puts: $53.0mQ4 23P/C 0.40
Numbers
QuarterCallsPutsP/C
Q1 2023$31.6m$13.2m0.42
Q2 2023$31.2m$6.4m0.21
Q3 2023$208.1m$58.0m0.28
Q4 2023$132.7m$53.0m0.40

Biggest buyers

FMR LLC Added +1,680,009+1.7m
FARALLON CAPITAL MANAGEMENT, L.L.C. Added +1,084,000+1.1m
Thrivent Financial for Lutherans Added +1,048,462+1.0m
JPMORGAN CHASE & CO Added +618,523+618.5k
Alyeska Investment Group, L.P. New +534,715+534.7k
CITADEL ADVISORS LLC Added +507,387+507.4k
MORGAN STANLEY Added +414,144+414.1k
Point72 Asset Management, L.P. Added +329,712+329.7k
SCHRODER INVESTMENT MANAGEMENT GROUP Added +327,863+327.9k
BlackRock Inc. Added +246,798+246.8k

Biggest sellers

EMINENCE CAPITAL, LP Sold out -1,036,253-1.0m
Sachem Head Capital Management LP Sold out -634,100-634.1k
MARTIN CURRIE LTD Reduced -490,913-490.9k
Hudson Bay Capital Management LP Sold out -285,048-285.0k
BNP PARIBAS ASSET MANAGEMENT Holding S.A. Reduced -248,122-248.1k
HAWK RIDGE CAPITAL MANAGEMENT LP Reduced -225,237-225.2k
Clearline Capital LP Reduced -213,452-213.5k
GLENVIEW CAPITAL MANAGEMENT, LLC Sold out -208,848-208.8k
Wolf Hill Capital Management, LP Sold out -200,000-200.0k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced -185,049-185.0k

Biggest calls

CITADEL ADVISORS LLC Reduced $27.1m231.1k shares
HBK INVESTMENTS L P Reduced $23.4m200.0k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $21.4m182.5k shares
Balyasny Asset Management L.P. Reduced $12.6m107.4k shares
SIMPLEX TRADING, LLC Added $12.1m103.2k shares
JANE STREET GROUP, LLC Added $8.4m71.7k shares
CAPITAL FUND MANAGEMENT S.A. Added $7.0m60.1k shares
Caption Management, LLC Reduced $3.9m33.5k shares
Polar Asset Management Partners Inc. New $2.8m24.3k shares
WOLVERINE TRADING, LLC Added $2.5m21.5k shares

Biggest puts

SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $16.1m137.6k shares
CAPITAL FUND MANAGEMENT S.A. Added $14.5m123.9k shares
CITADEL ADVISORS LLC Added $8.8m75.1k shares
SIMPLEX TRADING, LLC Reduced $5.2m44.4k shares
PEAK6 Investments LLC Reduced $1.8m15.7k shares
D. E. Shaw & Co., Inc. New $1.3m11.1k shares
Cubist Systematic Strategies, LLC Added $1.2m10.5k shares
JANE STREET GROUP, LLC Reduced $961.1k8.2k shares
Walleye Capital LLC Reduced $890.8k7.6k shares
TWO SIGMA SECURITIES, LLC Added $832.2k7.1k 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, Q4 2023

#ManagerLocationShares Value% of their portfolioChangeShares change
1 FMR LLC 0.06% of their portfolio BOSTON, MA 6,927,5726.9m $812.0m $812.0m 0.06% Added +1.7m +1,680,009
2 BlackRock Inc. 0.02% of their portfolio New York, NY 5,659,1315.7m $663.3m $663.3m 0.02% Added +246.8k +246,798
3 VANGUARD GROUP INC 0.01% of their portfolio Valley Forge, PA 4,781,3434.8m $560.4m $560.4m 0.01% Added +26.5k +26,473
4 Politan Capital Management LP 31.54% of their portfolio NEW YORK, NY 4,713,5184.7m $552.5m $552.5m 31.54% Unchanged
5 Capital Research Global Investors 0.07% of their portfolio Los Angeles, CA 2,269,1892.3m $266.0m $266.0m 0.07% Added +136.6k +136,617
6 MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.06% of their portfolio Boston, MA 1,607,3101.6m $188.4m $188.4m 0.06% Added +93.9k +93,861
7 RTW INVESTMENTS, LP 2.68% of their portfolio NEW YORK, NY 1,462,4001.5m $171.4m $171.4m 2.68% Reduced -39.1k -39,093
8 STATE STREET CORP 0.01% of their portfolio BOSTON, MA 1,357,4021.4m $159.1m $159.1m 0.01% Reduced -45.8k -45,806
9 FARALLON CAPITAL MANAGEMENT, L.L.C. 0.96% of their portfolio SAN FRANCISCO, CA 1,311,6491.3m $153.7m $153.7m 0.96% Added +1.1m +1,084,000
10 T. Rowe Price Investment Management, Inc. 0.09% of their portfolio BALTIMORE, MD 1,161,9071.2m $136.2m $136.2m 0.09% Added +244.4k +244,381
11 Thrivent Financial for Lutherans 0.27% of their portfolio Minneapolis, MN 1,063,3811.1m $124.6m $124.6m 0.27% Added +1.0m +1,048,462
12 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 916,048916.0k $107.4m $107.4m 0.00% Added +414.1k +414,144
13 SCHRODER INVESTMENT MANAGEMENT GROUP 0.13% of their portfolio London, X0 877,539877.5k $102.9m $102.9m 0.13% Added +327.9k +327,863
14 Liontrust Investment Partners LLP 1.45% of their portfolio LONDON, X0 852,393852.4k $99.9m $99.9m 1.45% Reduced -54.0k -54,045
15 WESTFIELD CAPITAL MANAGEMENT CO LP 0.56% of their portfolio BOSTON, MA 818,476818.5k $95.9m $95.9m 0.56% Added +214.8k +214,795
16 CITADEL ADVISORS LLC 0.09% of their portfolio MIAMI, FL 764,079764.1k $89.6m $89.6m 0.09% Added +507.4k +507,387
17 Jackson Square Partners, LLC 2.90% of their portfolio LARKSPUR, CA 762,329762.3k $89.4m $89.4m 2.90% Reduced -99.4k -99,379
18 GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio BOSTON, MA 723,936723.9k $84.9m $84.9m 0.01% Added +24.2k +24,183
19 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 710,398710.4k $83.3m $83.3m 0.00% Added +618.5k +618,523
20 Alyeska Investment Group, L.P. 0.42% of their portfolio CHICAGO, IL 534,715534.7k $62.7m $62.7m 0.42% New
21 Point72 Asset Management, L.P. 0.18% of their portfolio STAMFORD, CT 516,356516.4k $60.5m $60.5m 0.18% Added +329.7k +329,712
22 MIG Capital, LLC 7.32% of their portfolio NEWPORT BEACH, CA 447,279447.3k $52.4m $52.4m 7.32% Added +48.3k +48,347
23 ArrowMark Colorado Holdings LLC 0.55% of their portfolio Denver, CO 425,713425.7k $49.9m $49.9m 0.55% Added +122.9k +122,862
24 Bank of New York Mellon Corp 0.01% of their portfolio NEW YORK, NY 415,835415.8k $48.7m $48.7m 0.01% Added +25.2k +25,212
25 Sumitomo Mitsui Trust Group, Inc. 0.04% of their portfolio CHIYODA-KU, TOKYO, M0 413,815413.8k $48.5m $48.5m 0.04% Added +8.5k +8,498
26 PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio BALTIMORE, MD 410,508410.5k $48.1m $48.1m 0.01% Reduced -41.4k -41,431
27 Ensemble Capital Management, LLC 3.88% of their portfolio San Francisco, CA 372,178372.2k $43.6m $43.6m 3.88% Added +4.1k +4,138
28 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio SAN FRANCISCO, CA 368,041368.0k $43.1m $43.1m 0.01% Added +20.5k +20,519
29 NORTHERN TRUST CORP 0.01% of their portfolio CHICAGO, IL 347,353347.4k $40.7m $40.7m 0.01% Added +13.6k +13,577
30 HAWK RIDGE CAPITAL MANAGEMENT LP 2.30% of their portfolio LOS ANGELES, CA 342,528342.5k $40.1m $40.1m 2.30% Reduced -225.2k -225,237
31 Balyasny Asset Management L.P. 0.10% of their portfolio Chicago, IL 302,535302.5k $35.5m $35.5m 0.10% Added +52.1k +52,107
32 DIMENSIONAL FUND ADVISORS LP 0.01% of their portfolio AUSTIN, TX 301,488301.5k $35.3m $35.3m 0.01% Added +16.0k +16,042
33 Woodline Partners LP 0.36% of their portfolio San Francisco, CA 282,275282.3k $33.1m $33.1m 0.36% Added +211.5k +211,496
34 FIL Ltd 0.03% of their portfolio HAMILTON, D0 216,474216.5k $25.4m $25.4m 0.03% Added +99.0k +99,004
35 MILLENNIUM MANAGEMENT LLC 0.02% of their portfolio NEW YORK, NY 196,460196.5k $23.0m $23.0m 0.02% Reduced -44.7k -44,741
36 Legal & General Group Plc 0.01% of their portfolio London, X0 191,198191.2k $22.4m $22.4m 0.01% Reduced -10.5k -10,481
37 MARSHALL WACE, LLP 0.04% of their portfolio LONDON, X0 189,053189.1k $22.2m $22.2m 0.04% New
38 SEI INVESTMENTS CO 0.03% of their portfolio OAKS, PA 180,628180.6k $21.2m $21.2m 0.03% Reduced -3.3k -3,312
39 RAYMOND JAMES & ASSOCIATES 0.02% of their portfolio ST PETERSBURG, FL 179,615179.6k $21.1m $21.1m 0.02% Reduced -22.0k -22,037
40 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 175,510175.5k $20.6m $20.6m 0.00% Added +90.6k +90,572
41 FEDERATED HERMES, INC. 0.05% of their portfolio PITTSBURGH, PA 168,651168.7k $19.8m $19.8m 0.05% Reduced -984 -984
42 PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio DES MOINES, IA 164,627164.6k $19.3m $19.3m 0.01% Reduced -1.2k -1,160
43 Nine Ten Capital Management LLC 4.83% of their portfolio CHICAGO, IL 163,925163.9k $19.2m $19.2m 4.83% New
44 Retirement Systems of Alabama 0.07% of their portfolio MONTGOMERY, AL 144,792144.8k $17.0m $17.0m 0.07% Added +194 +194
45 RHUMBLINE ADVISERS 0.02% of their portfolio BOSTON, MA 137,951138.0k $16.2m $16.2m 0.02% Reduced -4.6k -4,578
46 BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.04% of their portfolio Paris, I0 137,294137.3k $16.1m $16.1m 0.04% Reduced -248.1k -248,122
47 Rockefeller Capital Management L.P. 0.05% of their portfolio NEW YORK, NY 128,091128.1k $15.0m $15.0m 0.05% Reduced -5.6k -5,628
48 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 116,712116.7k $13.7m $13.7m 0.00% Added +86.2k +86,162
49 Twin Tree Management, LP 0.24% of their portfolio DALLAS, TX 112,419112.4k $13.2m $13.2m 0.24% New
50 Senator Investment Group LP 0.55% of their portfolio New York, NY 110,000110.0k $12.9m $12.9m 0.55% Not comparable
51 COMERICA BANK 0.06% of their portfolio DALLAS, TX 109,259109.3k $12.8m $12.8m 0.06% Added +12.8k +12,845
52 Montanaro Asset Management Ltd 2.30% of their portfolio LONDON, X0 104,250104.2k $12.2m $12.2m 2.30% Reduced -38.0k -38,000
53 PICTON MAHONEY ASSET MANAGEMENT 0.56% of their portfolio Toronto, A6 103,037103.0k $12.1m $12.1m 0.56% New
54 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio NEW YORK, NY 102,275102.3k $12.0m $12.0m 0.00% Added +1.1k +1,117
55 Nuveen Asset Management, LLC 0.00% of their portfolio CHICAGO, IL 93,06893.1k $10.9m $10.9m 0.00% Reduced -1.1k -1,145
56 Swiss National Bank 0.01% of their portfolio ZURICH, V8 88,40088.4k $10.4m $10.4m 0.01% Reduced -10.2k -10,200
57 JANE STREET GROUP, LLC 0.01% of their portfolio NEW YORK, NY 86,50686.5k $10.1m $10.1m 0.01% Reduced -90.1k -90,109
58 BAILLIE GIFFORD & CO 0.01% of their portfolio EDINBURGH, X0 86,18886.2k $10.1m $10.1m 0.01% Reduced -5.0k -5,041
59 Susquehanna Portfolio Strategies, LLC 0.18% of their portfolio Bala Cynwyd, PA 85,17485.2k $10.0m $10.0m 0.18% First filing
60 GAMCO INVESTORS, INC. ET AL 0.11% of their portfolio GREENWICH, CT 84,50084.5k $9.9m $9.9m 0.11% Unchanged
61 AMERIPRISE FINANCIAL INC 0.00% of their portfolio MINNEAPOLIS, MN 82,79582.8k $9.7m $9.7m 0.00% Added +8.7k +8,741
62 Gotham Asset Management, LLC 0.17% of their portfolio NEW YORK, NY 80,05680.1k $9.4m $9.4m 0.17% Added +74.8k +74,803
63 TD Asset Management Inc 0.01% of their portfolio Toronto, A6 79,43079.4k $9.3m $9.3m 0.01% Added +8.0k +8,000
64 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 78,10378.1k $9.2m $9.2m 0.00% Reduced -21.9k -21,859
65 California Public Employees Retirement System 0.01% of their portfolio Sacramento, CA 77,45877.5k $9.1m $9.1m 0.01% Reduced -5.8k -5,837
66 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 67,51767.5k $7.9m $7.9m 0.00% Added +5.5k +5,485
67 Clearline Capital LP 0.81% of their portfolio NEW YORK, NY 62,19762.2k $7.3m $7.3m 0.81% Reduced -213.5k -213,452
68 BNP PARIBAS FINANCIAL MARKETS 0.01% of their portfolio PARIS, I0 61,83261.8k $7.2m $7.2m 0.01% Reduced -65.9k -65,910
69 AMERICAN INTERNATIONAL GROUP, INC. 0.03% of their portfolio New York, NY 60,32160.3k $7.1m $7.1m 0.03% Reduced -2.6k -2,564
70 MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio Toronto, A6 56,56856.6k $6.6m $6.6m 0.00% Added +831 +831
71 KORNITZER CAPITAL MANAGEMENT INC /KS 0.12% of their portfolio SHAWNEE MISSION, KS 53,00053.0k $6.2m $6.2m 0.12% New
72 CITIGROUP INC 0.01% of their portfolio NEW YORK, NY 52,61452.6k $6.2m $6.2m 0.01% Reduced -969 -969
73 ExodusPoint Capital Management, LP 0.07% of their portfolio NEW YORK, NY 51,28951.3k $6.0m $6.0m 0.07% Reduced -65.3k -65,320
74 NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio ALBANY, NY 50,54850.5k $5.9m $5.9m 0.01% Reduced -2.5k -2,500
75 LOGAN CAPITAL MANAGEMENT INC 0.27% of their portfolio Newtown Square, PA 49,87349.9k $5.8m $5.8m 0.27% Reduced -1.4k -1,415
76 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 49,26049.3k $5.8m $5.8m 0.00% Added +17.9k +17,932
77 STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio TALLAHASSEE, FL 49,15149.2k $5.8m $5.8m 0.01% Added +1.9k +1,945
78 NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio ALBANY, NY 47,30447.3k $5.5m $5.5m 0.01% Reduced -5.5k -5,514
79 CREDIT SUISSE AG/ 0.01% of their portfolio ZURICH, V8 47,27947.3k $5.5m $5.5m 0.01% Added +4.6k +4,590
80 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio WEST SACRAMENTO, CA 47,15747.2k $5.5m $5.5m 0.01% Reduced -2.1k -2,124
81 Bridgewater Associates, LP 0.03% of their portfolio Westport, CT 45,72645.7k $5.4m $5.4m 0.03% Reduced -7.4k -7,442
82 13D Management LLC 3.04% of their portfolio New York, NY 44,09544.1k $5.2m $5.2m 3.04% Added +22.0k +21,982
83 Man Group plc 0.01% of their portfolio LONDON, X0 41,95542.0k $4.9m $4.9m 0.01% New
84 Polar Asset Management Partners Inc. 0.13% of their portfolio TORONTO, A6 40,20040.2k $4.7m $4.7m 0.13% New
85 CenterBook Partners LP 0.56% of their portfolio GREENWICH, CT 39,40439.4k $4.6m $4.6m 0.56% Reduced -1.8k -1,772
86 TEXAS PERMANENT SCHOOL FUND CORP 0.04% of their portfolio AUSTIN, TX 38,30038.3k $4.5m $4.5m 0.04% Added +677 +677
87 Lighthouse Investment Partners, LLC 0.32% of their portfolio Palm Beach Gardens, FL 37,28937.3k $4.4m $4.4m 0.32% New
88 PEAK6 Investments LLC 0.19% of their portfolio CHICAGO, IL 37,12437.1k $4.4m $4.4m 0.19% Added +7.4k +7,404
89 Simplify Asset Management Inc. 0.67% of their portfolio Las Vegas, NV 36,91636.9k $4.3m $4.3m 0.67% New
90 DekaBank Deutsche Girozentrale 0.01% of their portfolio FRANKFURT, 2M 35,90035.9k $4.2m $4.2m 0.01% Added +970 +970
91 Moran Wealth Management, LLC 0.15% of their portfolio NAPLES, FL 35,74835.7k $4.2m $4.2m 0.15% Added +991 +991
92 NS Partners Ltd 0.20% of their portfolio LONDON, X0 35,61835.6k $4.2m $4.2m 0.20% Reduced -5.9k -5,899
93 BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp 0.03% of their portfolio VICTORIA, A1 35,00035.0k $4.1m $4.1m 0.03% Reduced -12.0k -12,000
94 GABELLI FUNDS LLC 0.03% of their portfolio Rye, NY 33,00033.0k $3.9m $3.9m 0.03% Unchanged
95 CANADA LIFE ASSURANCE Co 0.01% of their portfolio WINNIPEG, A2 32,57032.6k $3.8m $3.8m 0.01% Added +51 +51
96 South Dakota Investment Council 0.08% of their portfolio SIOUX FALLS, SD 32,44732.4k $3.8m $3.8m 0.08% Unchanged
97 UBS Group AG 0.00% of their portfolio ZURICH, V8 32,12432.1k $3.8m $3.8m 0.00% Reduced -15.9k -15,944
98 Mirae Asset Global Investments Co., Ltd. 0.01% of their portfolio SEOUL, M5 31,51331.5k $3.7m $3.7m 0.01% Added +6.7k +6,715
99 Collaborative Holdings Management LP 11.08% of their portfolio NEW YORK, NY 31,00931.0k $3.6m $3.6m 11.08% New
100 Birchview Capital, LP 1.40% of their portfolio BURLINGTON, VT 30,56030.6k $3.6m $3.6m 1.40% Unchanged