MASIMO CORP - Common Stock, par value $0.001 per share (MASI) Institutional Ownership

13F Institutional Holders and Ownership History from Q1 2014 to Q4 2025

Type / Class
Equity / Common Stock, par value $0.001 per share
Symbol
MASI on Nasdaq
Shares outstanding
74,046,339
Price per share
$146.21
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
55,311,796
Total reported value
$7,194,847,309
% of total 13F portfolios
0%
Share change
-840,991
Value change
-$129,915,636
Number of holders
382
Price from insider filings
$146.21
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of MASIMO CORP - Common Stock, par value $0.001 per share (MASI) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
FMR LLC 15% $1,315,009,580 8,031,083 FMR LLC 31 Dec 2024
KIANI JOE E 10% -7.3% $767,956,048 -$61,400,155 5,904,629 -7.4% Joe Kiani 31 Dec 2025
Politan Capital Management LP 6.2% $671,231,541 4,590,873 Quentin Koffey 16 Feb 2026
BlackRock Portfolio Management LLC 8.2% -21% $570,482,438 -$149,630,388 4,386,302 -21% BlackRock Portfolio Management LLC 31 Dec 2025
BlackRock, Inc. 7.9% $692,807,191 4,231,142 BlackRock, Inc. 31 Jan 2025

As of 31 Dec 2025, 382 institutional investors reported holding 55,311,796 shares of MASIMO CORP - Common Stock, par value $0.001 per share (MASI). This represents 75% of the company’s total 74,046,339 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of MASIMO CORP - Common Stock, par value $0.001 per share (MASI) together control 62% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
BlackRock, Inc. 12% 8,855,619 -15% 0.02% $1,151,761,872
FMR LLC 11% 7,864,164 -4.3% 0.05% $1,022,813,172
Politan Capital Management LP 6.2% 4,589,648 0% 71% $596,929,619
VANGUARD GROUP INC 5.9% 4,348,786 -9.6% 0.01% $565,603,107
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 3.6% 2,663,875 +1.7% 0.11% $346,463,583
T. Rowe Price Investment Management, Inc. 3.1% 2,330,158 +9.6% 0.19% $303,061,000
NAYA CAPITAL MANAGEMENT UK LTD 2.1% 1,560,697 15% $202,984,252
WESTFIELD CAPITAL MANAGEMENT CO LP 2.1% 1,522,049 +7.2% 0.82% $197,957,646
STATE STREET CORP 1.9% 1,415,196 -4.7% 0.01% $184,060,392
Alyeska Investment Group, L.P. 1.7% 1,259,307 -8.8% 0.46% $163,785,468
AQR CAPITAL MANAGEMENT LLC 1.5% 1,091,326 +3417% 0.07% $141,937,886
GEODE CAPITAL MANAGEMENT, LLC 1.3% 953,976 +1.2% 0.01% $124,096,067
MORGAN STANLEY 1.2% 920,735 +33% 0.01% $119,751,047
RTW INVESTMENTS, LP 0.92% 683,294 0% 0.89% $88,869,218
Capital Research Global Investors 0.86% 637,894 -66% 0.02% $82,964,494
GOLDMAN SACHS GROUP INC 0.86% 636,698 -14% 0.01% $82,808,942
Liontrust Investment Partners LLP 0.85% 627,796 -7.9% 1.2% $81,651,148
UBS Group AG 0.81% 599,274 +253% 0.02% $77,941,576
Squarepoint Ops LLC 0.79% 583,747 -6% 0.15% $75,922,135
VIKING GLOBAL INVESTORS LP 0.69% 514,340 -52% 0.18% $66,895,060
SCHRODER INVESTMENT MANAGEMENT GROUP 0.64% 475,504 +41% 0.05% $62,324,309
AMERIPRISE FINANCIAL INC 0.63% 468,407 +1.6% 0.01% $60,921,015
NORTHERN TRUST CORP 0.51% 380,464 -3% 0.01% $49,483,147
NORGES BANK 0.51% 377,421 0.01% $49,087,375
BAMCO INC /NY/ 0.5% 373,899 -3.8% 0.13% $48,629,304

Institutional Holders of MASIMO CORP - Common Stock, par value $0.001 per share (MASI) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 55,311,796 $7,194,847,309 -$129,915,636 $130.06 382
2025 Q3 56,175,682 $8,285,636,420 -$242,029,720 $147.55 354
2025 Q2 57,531,263 $9,678,040,277 +$566,298,917 $168.22 375
2025 Q1 54,245,883 $9,034,866,757 +$448,557,462 $166.60 389
2024 Q4 51,411,548 $8,501,447,911 +$221,294,182 $165.30 362
2024 Q3 50,430,653 $6,717,968,664 +$195,557,848 $133.33 357
2024 Q2 49,545,428 $6,238,873,009 -$289,595,358 $125.94 350
2024 Q1 51,603,603 $7,578,656,800 +$54,858,314 $146.85 330
2023 Q4 50,338,512 $5,900,007,837 +$429,947,280 $117.21 333
2023 Q3 47,611,421 $4,174,934,463 -$49,427,852 $87.68 349
2023 Q2 45,905,078 $7,556,450,399 +$147,455,979 $164.55 406
2023 Q1 44,980,748 $8,299,415,764 +$131,407,346 $184.54 422
2022 Q4 44,446,198 $6,576,885,382 -$261,109,381 $147.95 399
2022 Q3 46,357,468 $6,545,831,305 +$305,043,460 $141.16 405
2022 Q2 44,331,887 $5,805,221,289 -$135,171,216 $130.67 394
2022 Q1 45,258,877 $6,588,554,196 -$700,651,716 $145.54 435
2021 Q4 46,324,863 $13,546,650,154 -$6,634,536 $292.78 502
2021 Q3 46,260,495 $12,512,067,827 +$159,621,988 $270.71 457
2021 Q2 45,755,768 $11,088,901,374 +$303,542,126 $242.45 447
2021 Q1 45,034,445 $10,334,233,469 -$154,653,705 $229.66 469
2020 Q4 46,134,675 $12,367,769,029 +$118,456,546 $268.38 480
2020 Q3 45,513,746 $10,736,770,297 -$426,567 $236.06 449
2020 Q2 45,565,863 $10,382,684,886 -$45,339,410 $227.99 467
2020 Q1 45,927,274 $8,139,877,716 +$51,831,017 $177.12 394
2019 Q4 44,938,202 $7,100,269,622 +$134,499,433 $158.06 376
2019 Q3 44,078,987 $6,554,014,971 -$26,539,658 $148.79 387
2019 Q2 44,253,000 $6,579,080,937 +$87,334,220 $148.82 380
2019 Q1 44,448,873 $6,143,880,819 +$95,355,328 $138.28 397
2018 Q4 43,916,003 $4,715,440,176 +$4,670,131 $107.37 362
2018 Q3 43,758,851 $5,449,391,811 +$30,553,990 $124.54 347
2018 Q2 43,689,354 $4,266,798,989 +$9,236,648 $97.65 334
2018 Q1 43,588,229 $3,833,601,534 +$188,073,886 $87.95 319
2017 Q4 43,928,863 $3,723,381,823 -$101,698,184 $84.80 333
2017 Q3 43,964,692 $3,803,529,775 -$1,695,010 $86.56 316
2017 Q2 43,952,421 $4,007,992,911 +$119,093,443 $91.18 330
2017 Q1 42,650,521 $3,978,048,815 +$842,907,910 $93.26 363
2016 Q4 40,449,406 $2,726,201,878 -$2,875,693 $67.40 308
2016 Q3 40,553,020 $2,411,634,707 +$66,436,055 $59.49 290
2016 Q2 39,482,461 $2,073,623,320 +$7,155,965 $52.51 261
2016 Q1 39,653,579 $1,658,291,704 -$7,451,543 $41.84 223
2015 Q4 39,855,135 $1,654,226,332 -$19,334,090 $41.51 234
2015 Q3 40,350,761 $1,555,877,307 -$10,152,670 $38.56 216
2015 Q2 40,873,752 $1,583,092,408 -$59,576,606 $38.74 198
2015 Q1 42,183,688 $1,389,342,995 +$18,569,076 $32.98 174
2014 Q4 42,045,270 $1,107,548,336 -$9,241,122 $26.34 177
2014 Q3 43,030,779 $915,663,226 -$56,283,952 $21.28 166
2014 Q2 45,421,118 $1,071,924,710 -$84,818,879 $23.60 176
2014 Q1 48,536,107 $1,325,418,870 +$23,725,182 $27.31 168