Vault-13

MASIMO CORP MASI

COM · Common Stock · CUSIP 574795100 · ISIN US5747951003

417 institutional holders -12 vs Q1 2023
45,924,37245.9m shares reported held*
$7.6bnreported value*
45 new 114 added 170 reduced 59 sold out net sold ≈ $847.3m (-5.1m 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 ($6.9m this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $164.62. Options: 13 managers hold calls ($31.2m notional), 7 hold puts ($6.4m).

Trends to Q2 2023

Institutional holders

Managers reporting a position, each quarter

0200400600Q3 22: 420Q4 22: 405Q1 23: 429Q2 23: 417417Q3 22Q4 22Q1 23Q2 23
Numbers
QuarterHolders
Q3 2022420
Q4 2022405
Q1 2023429
Q2 2023417

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 23
Numbers
QuarterBought or addedCut or sold out
Q4 2022154232
Q1 2023198180
Q2 2023159229

Calls vs puts

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

CallsPuts
$0$10m$20m$30m$40mQ3 22 calls: $11.8mQ3 22 puts: $5.0mQ3 22P/C 0.43Q4 22 calls: $17.1mQ4 22 puts: $7.5mQ4 22P/C 0.44Q1 23 calls: $31.6mQ1 23 puts: $13.2mQ1 23P/C 0.42Q2 23 calls: $31.2mQ2 23 puts: $6.4mQ2 23P/C 0.21
Numbers
QuarterCallsPutsP/C
Q3 2022$11.8m$5.0m0.43
Q4 2022$17.1m$7.5m0.44
Q1 2023$31.6m$13.2m0.42
Q2 2023$31.2m$6.4m0.21

Biggest buyers

WESTFIELD CAPITAL MANAGEMENT CO LP New +953,799+953.8k
VANGUARD GROUP INC Added +182,918+182.9k
BlackRock Inc. Added +178,267+178.3k
FIRST TRUST ADVISORS LP Added +136,015+136.0k
Jackson Square Partners, LLC New +126,540+126.5k
Point72 Asset Management, L.P. Added +119,823+119.8k
FEDERATED HERMES, INC. Added +112,708+112.7k
HAWK RIDGE CAPITAL MANAGEMENT LP Added +67,781+67.8k
NORGES BANK Added +65,790+65.8k
PUTNAM INVESTMENTS LLC New +61,600+61.6k

Biggest sellers

FMR LLC Reduced -5,012,635-5.0m
FARALLON CAPITAL MANAGEMENT, L.L.C. Reduced -264,000-264.0k
MILLENNIUM MANAGEMENT LLC Reduced -176,571-176.6k
D. E. Shaw & Co., Inc. Reduced -147,751-147.8k
Alyeska Investment Group, L.P. Reduced -118,983-119.0k
CITADEL ADVISORS LLC Reduced -116,787-116.8k
Cinctive Capital Management LP Reduced -100,413-100.4k
PRICE T ROWE ASSOCIATES INC /MD/ Reduced -96,568-96.6k
Obermeyer Wealth Partners Reduced -83,402-83.4k
TWO SIGMA ADVISERS, LP Reduced -66,300-66.3k

Biggest calls

Balyasny Asset Management L.P. Added $10.7m65.0k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $9.4m56.9k shares
CITADEL ADVISORS LLC Reduced $4.2m25.8k shares
MILLENNIUM MANAGEMENT LLC New $2.5m15.0k shares
JANE STREET GROUP, LLC Added $1.1m6.8k shares
PEAK6 Investments LLC Reduced $1.0m6.3k shares
DRW Securities, LLC New $987.0k6.0k shares
WOLVERINE TRADING, LLC Reduced $679.1k4.1k shares
Parallax Volatility Advisers, L.P. New $246.8k1.5k shares
SIMPLEX TRADING, LLC Reduced $246.0k1.5k shares

Biggest puts

SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $2.6m15.9k shares
CITADEL ADVISORS LLC Reduced $1.7m10.4k shares
PEAK6 Investments LLC Added $1.0m6.3k shares
SIMPLEX TRADING, LLC Added $460.0k2.8k shares
WOLVERINE TRADING, LLC Reduced $364.4k2.2k shares
JANE STREET GROUP, LLC Reduced $230.4k1.4k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 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 2023

#ManagerLocationShares Value% of their portfolioChangeShares change
1 FMR LLC 0.10% of their portfolio BOSTON, MA 7,157,2777.2m $1.2bn $1.2bn 0.10% Reduced -5.0m -5,012,635
2 BlackRock Inc. 0.03% of their portfolio New York, NY 6,120,1236.1m $1.0bn $1.0bn 0.03% Added +178.3k +178,267
3 VANGUARD GROUP INC 0.02% of their portfolio Valley Forge, PA 4,855,2694.9m $798.9m $798.9m 0.02% Added +182.9k +182,918
4 Politan Capital Management LP 45.96% of their portfolio NEW YORK, NY 4,713,5184.7m $775.6m $775.6m 45.96% Reduced -26.4k -26,445
5 STATE STREET CORP 0.01% of their portfolio BOSTON, MA 1,664,7861.7m $273.9m $273.9m 0.01% Reduced -46.8k -46,809
6 Capital Research Global Investors 0.07% of their portfolio Los Angeles, CA 1,652,5241.7m $271.9m $271.9m 0.07% Added +974 +974
7 RTW INVESTMENTS, LP 4.70% of their portfolio NEW YORK, NY 1,501,4931.5m $247.1m $247.1m 4.70% Unchanged
8 WESTFIELD CAPITAL MANAGEMENT CO LP 1.00% of their portfolio BOSTON, MA 953,799953.8k $156.9m $156.9m 1.00% New
9 Liontrust Investment Partners LLP 2.18% of their portfolio LONDON, X0 920,406920.4k $151.5m $151.5m 2.18% Reduced -31.8k -31,794
10 GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio BOSTON, MA 758,606758.6k $124.6m $124.6m 0.01% Added +32.6k +32,588
11 Fundsmith LLP 0.50% of their portfolio LONDON, X0 730,377730.4k $120.2m $120.2m 0.50% Reduced -33.9k -33,942
12 SCHRODER INVESTMENT MANAGEMENT GROUP 0.15% of their portfolio London, X0 643,055643.1k $105.8m $105.8m 0.15% Reduced -55.9k -55,933
13 T. Rowe Price Investment Management, Inc. 0.06% of their portfolio BALTIMORE, MD 518,008518.0k $85.2m $85.2m 0.06% Reduced -18.1k -18,147
14 MARTIN CURRIE LTD 2.78% of their portfolio EDINBURGH, X0 502,063502.1k $82.6m $82.6m 2.78% Added +1.6k +1,568
15 Bank of New York Mellon Corp 0.02% of their portfolio NEW YORK, NY 497,171497.2k $81.8m $81.8m 0.02% Reduced -26.3k -26,289
16 Sumitomo Mitsui Trust Group, Inc. 0.06% of their portfolio CHIYODA-KU, TOKYO, M0 490,107490.1k $80.6m $80.6m 0.06% Reduced -2.8k -2,839
17 NORGES BANK 0.01% of their portfolio OSLO, Q8 437,000437.0k $71.9m $71.9m 0.01% Added +65.8k +65,790
18 NORTHERN TRUST CORP 0.01% of their portfolio CHICAGO, IL 417,544417.5k $68.7m $68.7m 0.01% Reduced -45.2k -45,190
19 BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.20% of their portfolio Paris, I0 393,907393.9k $64.8m $64.8m 0.20% Reduced -21.6k -21,577
20 FARALLON CAPITAL MANAGEMENT, L.L.C. 0.36% of their portfolio SAN FRANCISCO, CA 367,649367.6k $60.5m $60.5m 0.36% Reduced -264.0k -264,000
21 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.02% of their portfolio SAN FRANCISCO, CA 357,134357.1k $58.8m $58.8m 0.02% Reduced -740 -740
22 GENEVA CAPITAL MANAGEMENT LLC 0.99% of their portfolio MILWAUKEE, WI 304,691304.7k $50.1m $50.1m 0.99% Reduced -2.3k -2,348
23 Legal & General Group Plc 0.02% of their portfolio London, X0 302,596302.6k $49.8m $49.8m 0.02% Reduced -26.4k -26,380
24 Ensemble Capital Management, LLC 4.63% of their portfolio San Francisco, CA 291,111291.1k $47.9m $47.9m 4.63% Reduced -53.8k -53,807
25 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 270,702270.7k $44.5m $44.5m 0.00% Reduced -40.6k -40,558
26 RAYMOND JAMES & ASSOCIATES 0.04% of their portfolio ST PETERSBURG, FL 265,492265.5k $43.7m $43.7m 0.04% Reduced -5.9k -5,908
27 J.P. Morgan Private Wealth Advisors LLC 0.22% of their portfolio SAN FRANCISCO, CA 262,569262.6k $43.2m $43.2m 0.22% Reduced -241 -241
28 DIMENSIONAL FUND ADVISORS LP 0.01% of their portfolio AUSTIN, TX 255,449255.4k $42.0m $42.0m 0.01% Added +17.6k +17,574
29 HAWK RIDGE CAPITAL MANAGEMENT LP 2.21% of their portfolio LOS ANGELES, CA 253,002253.0k $41.6m $41.6m 2.21% Added +67.8k +67,781
30 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 235,850235.8k $38.8m $38.8m 0.00% Reduced -28.7k -28,713
31 MILLENNIUM MANAGEMENT LLC 0.04% of their portfolio NEW YORK, NY 218,982219.0k $36.0m $36.0m 0.04% Reduced -176.6k -176,571
32 Alyeska Investment Group, L.P. 0.26% of their portfolio CHICAGO, IL 204,409204.4k $33.6m $33.6m 0.26% Reduced -119.0k -118,983
33 TWO SIGMA ADVISERS, LP 0.08% of their portfolio NEW YORK, NY 185,800185.8k $30.6m $30.6m 0.08% Reduced -66.3k -66,300
34 PRINCIPAL FINANCIAL GROUP INC 0.02% of their portfolio DES MOINES, IA 184,391184.4k $30.3m $30.3m 0.02% Reduced -10.7k -10,657
35 FIRST TRUST ADVISORS LP 0.03% of their portfolio Wheaton, IL 179,275179.3k $29.5m $29.5m 0.03% Added +136.0k +136,015
36 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.02% of their portfolio NEW YORK, NY 173,976174.0k $32.1m $32.1m 0.02% Unchanged
37 FEDERATED HERMES, INC. 0.07% of their portfolio PITTSBURGH, PA 166,235166.2k $27.4m $27.4m 0.07% Added +112.7k +112,708
38 Swiss National Bank 0.02% of their portfolio ZURICH, V8 160,800160.8k $26.5m $26.5m 0.02% Reduced -36.9k -36,900
39 RHUMBLINE ADVISERS 0.03% of their portfolio BOSTON, MA 158,984159.0k $26.2m $26.2m 0.03% Added +9.6k +9,627
40 Rockefeller Capital Management L.P. 0.10% of their portfolio NEW YORK, NY 152,009152.0k $25.0m $25.0m 0.10% First filing
41 Obermeyer Wealth Partners 1.80% of their portfolio ASPEN, CO 151,848151.8k $25.0m $25.0m 1.80% Reduced -83.4k -83,402
42 Retirement Systems of Alabama 0.11% of their portfolio MONTGOMERY, AL 151,777151.8k $25.0m $25.0m 0.11% Reduced -611 -611
43 Montanaro Asset Management Ltd 3.70% of their portfolio LONDON, X0 142,250142.2k $23.4m $23.4m 3.70% Added +8.5k +8,500
44 Point72 Asset Management, L.P. 0.08% of their portfolio STAMFORD, CT 134,323134.3k $22.1m $22.1m 0.08% Added +119.8k +119,823
45 MIG Capital, LLC 3.94% of their portfolio NEWPORT BEACH, CA 132,250132.2k $21.8m $21.8m 3.94% Reduced -55.3k -55,285
46 Nuveen Asset Management, LLC 0.01% of their portfolio CHICAGO, IL 128,016128.0k $21.1m $21.1m 0.01% Reduced -807 -807
47 Jackson Square Partners, LLC 0.61% of their portfolio LARKSPUR, CA 126,540126.5k $20.8m $20.8m 0.61% New
48 ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.02% of their portfolio BOSTON, MA 114,460114.5k $18.8m $18.8m 0.02% Added +5.1k +5,149
49 AMERIPRISE FINANCIAL INC 0.01% of their portfolio MINNEAPOLIS, MN 104,990105.0k $17.3m $17.3m 0.01% Added +21.3k +21,279
50 BANK OF MONTREAL /CAN/ 0.01% of their portfolio TORONTO, A6 102,964103.0k $17.2m $17.2m 0.01% Added +12.6k +12,588
51 BAILLIE GIFFORD & CO 0.01% of their portfolio EDINBURGH, X0 95,14995.1k $15.7m $15.7m 0.01% Reduced -863 -863
52 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 93,04093.0k $15.3m $15.3m 0.00% Reduced -22.8k -22,780
53 California Public Employees Retirement System 0.01% of their portfolio Sacramento, CA 92,87192.9k $15.3m $15.3m 0.01% Reduced -2.8k -2,836
54 GAMCO INVESTORS, INC. ET AL 0.15% of their portfolio GREENWICH, CT 84,50084.5k $13.9m $13.9m 0.15% Reduced -500 -500
55 UBS Group AG 0.01% of their portfolio ZURICH, V8 81,58681.6k $13.4m $13.4m 0.01% Reduced -13.3k -13,329
56 NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio NEW YORK, NY 80,28580.3k $13.2m $13.2m 0.01% Reduced -45.3k -45,347
57 DEUTSCHE BANK AG\ 0.01% of their portfolio FRANKFURT AM MAIN, 2M 79,76679.8k $13.1m $13.1m 0.01% Reduced -25.7k -25,708
58 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 76,45676.5k $12.6m $12.6m 0.00% Added +7.9k +7,940
59 AMERICAN INTERNATIONAL GROUP, INC. 0.07% of their portfolio New York, NY 73,69073.7k $12.1m $12.1m 0.07% Reduced -1.1k -1,093
60 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.02% of their portfolio WEST SACRAMENTO, CA 72,74372.7k $12.0m $12.0m 0.02% Reduced -9.7k -9,712
61 Harbor Spring Capital, LLC 6.61% of their portfolio NEW YORK, NY 70,30070.3k $11.6m $11.6m 6.61% Added +9.1k +9,061
62 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 69,64369.6k $11.5m $11.5m 0.00% Reduced -2.2k -2,176
63 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 67,94267.9k $11.2m $11.2m 0.00% Added +5.9k +5,893
64 CITIGROUP INC 0.01% of their portfolio NEW YORK, NY 64,90764.9k $10.7m $10.7m 0.01% Reduced -56.2k -56,230
65 NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio ALBANY, NY 63,77463.8k $10.5m $10.5m 0.01% Added +762 +762
66 PUTNAM INVESTMENTS LLC 0.01% of their portfolio BOSTON, MA 61,60061.6k $10.1m $10.1m 0.01% New
67 Public Sector Pension Investment Board 0.07% of their portfolio MONTREAL, A8 60,00060.0k $9.9m $9.9m 0.07% Unchanged
68 NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.02% of their portfolio ALBANY, NY 59,45559.5k $9.8m $9.8m 0.02% Reduced -2.2k -2,200
69 Amundi 0.00% of their portfolio Paris, I0 57,32157.3k $9.2m $9.2m 0.00% Reduced -14.1k -14,108
70 Balyasny Asset Management L.P. 0.03% of their portfolio Chicago, IL 56,79456.8k $9.3m $9.3m 0.03% Added +8.2k +8,162
71 SEI INVESTMENTS CO 0.02% of their portfolio OAKS, PA 56,69156.7k $9.3m $9.3m 0.02% Added +14.7k +14,686
72 Bridgewater Associates, LP 0.06% of their portfolio Westport, CT 55,67955.7k $9.2m $9.2m 0.06% Reduced -5.8k -5,771
73 STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.02% of their portfolio TALLAHASSEE, FL 53,93353.9k $8.9m $8.9m 0.02% Reduced -906 -906
74 Wilmington Savings Fund Society, FSB 0.36% of their portfolio WILMINGTON, DE 52,63352.6k $8.7m $8.7m 0.36% Reduced -1.9k -1,893
75 D. E. Shaw & Co., Inc. 0.01% of their portfolio New York, NY 51,93751.9k $8.5m $8.5m 0.01% Reduced -147.8k -147,751
76 LOGAN CAPITAL MANAGEMENT INC 0.41% of their portfolio Newtown Square, PA 51,53051.5k $8.5m $8.5m 0.41% Reduced -109 -109
77 BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp 0.08% of their portfolio VICTORIA, A1 51,03351.0k $8.4m $8.4m 0.08% Reduced -13.4k -13,382
78 BARCLAYS PLC 0.01% of their portfolio LONDON, X0 48,95249.0k $8.1m $8.1m 0.01% Added +5.5k +5,502
79 SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC 0.28% of their portfolio BALA CYNWYD, PA 46,66946.7k $7.7m $7.7m 0.28% Unchanged
80 Asset Management One Co., Ltd. 0.03% of their portfolio TOKYO, M0 45,33445.3k $7.5m $7.5m 0.03% Reduced -84 -84
81 Carmignac Gestion 0.13% of their portfolio PARIS, I0 45,27845.3k $7.5m $7.5m 0.13% Added +18.4k +18,414
82 TEXAS PERMANENT SCHOOL FUND CORP 0.07% of their portfolio AUSTIN, TX 42,75442.8k $7.0m $7.0m 0.07% Reduced -615 -615
83 NS Partners Ltd 0.36% of their portfolio LONDON, X0 41,62141.6k $6.8m $6.8m 0.36% Reduced -453 -453
84 Allspring Global Investments Holdings, LLC 0.01% of their portfolio CHARLOTTE, NC 41,58041.6k $6.8m $6.8m 0.01% Reduced -10.6k -10,595
85 RENAISSANCE TECHNOLOGIES LLC 0.01% of their portfolio NEW YORK, NY 41,23041.2k $6.8m $6.8m 0.01% Reduced -40.1k -40,070
86 Bell Asset Management Ltd 1.14% of their portfolio Melbourne, C3 40,57540.6k $6.7m $6.7m 1.14% Added +16.6k +16,621
87 APG Asset Management N.V. 0.01% of their portfolio Amsterdam, P7 40,21340.2k $6.1m $6.1m 0.01% Reduced -4.5k -4,456
88 CITADEL ADVISORS LLC 0.01% of their portfolio MIAMI, FL 39,53439.5k $6.5m $6.5m 0.01% Reduced -116.8k -116,787
89 CREDIT SUISSE AG/ 0.01% of their portfolio ZURICH, V8 39,35739.4k $6.5m $6.5m 0.01% Reduced -16.6k -16,553
90 Qube Research & Technologies Ltd 0.02% of their portfolio LONDON, X0 39,17539.2k $6.4m $6.4m 0.02% New
91 BESSEMER GROUP INC 0.01% of their portfolio WOODBRIDGE, NJ 39,00039.0k $6.4m $6.4m 0.01% Added +2.6k +2,614
92 RK Capital Management, LLC 1.38% of their portfolio Denver, CO 38,99539.0k $6.4m $6.4m 1.38% Added +5.0k +5,040
93 FORTE CAPITAL LLC /ADV 0.90% of their portfolio ROCHESTER, NY 37,94937.9k $6.2m $6.2m 0.90% Added +2.7k +2,665
94 E. Ohman J:or Asset Management AB 0.22% of their portfolio STOCKHOLM, V7 37,61337.6k $6.2m $6.2m 0.22% Reduced -2.0k -2,000
95 MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio Toronto, A6 36,33736.3k $6.0m $6.0m 0.00% Reduced -6.3k -6,322
96 MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC 0.07% of their portfolio New York, NY 35,30535.3k $5.8m $5.8m 0.07% Reduced -3.6k -3,634
97 STATE OF WISCONSIN INVESTMENT BOARD 0.02% of their portfolio MADISON, WI 34,88334.9k $5.7m $5.7m 0.02% Added +5.0k +5,013
98 AMALGAMATED BANK 0.05% of their portfolio NEW YORK, NY 34,70234.7k $5.7m $5.7m 0.05% Reduced -248 -248
99 DekaBank Deutsche Girozentrale 0.01% of their portfolio FRANKFURT, 2M 34,00834.0k $5.6m $5.6m 0.01% Reduced -29.1k -29,052
100 CANADA LIFE ASSURANCE Co 0.01% of their portfolio WINNIPEG, A2 33,74533.7k $5.6m $5.6m 0.01% Reduced -8.8k -8,821