MASIMO CORP

Ticker: MASI CUSIP: 574795100 Class: Common Stock

RTW INVESTMENTS, LP's Holding History (CIK: 0001493215)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025
Shares 683,294 Value ($000) $88,869 Avg Close $143.19 Range $129.77 - $157.72
Q3 2025
Shares 683,294 Value ($000) $100,820 Avg Close $151.39 Range $135.34 - $172.55
Q2 2025
Shares 683,294 Value ($000) $114,944 Avg Close $159.72 Range $133.70 - $174.50
Q1 2025
Shares 683,294 Value ($000) $113,837 Avg Close $173.51 Range $159.29 - $194.88
Q4 2024
Shares 683,294 Value ($000) $112,948 Avg Close $157.91 Range $131.60 - $180.97
Q3 2024
Shares 1,462,400 Value ($000) $194,982 Avg Close $116.03 Range $101.61 - $135.78
Q2 2024
Shares 1,462,400 Value ($000) $184,175 Avg Close $131.69 Range $112.85 - $147.89
Q1 2024
Shares 1,462,400 Value ($000) $214,753 Avg Close $129.12 Range $107.57 - $153.93
Q4 2023
Shares 1,462,400 Value ($000) $171,408 Avg Close $93.21 Range $75.22 - $122.60
Q3 2023
Shares 1,501,493 Value ($000) $131,651 Avg Close $116.39 Range $83.03 - $164.16
Q2 2023
Shares 1,501,493 Value ($000) $247,071 Avg Close $174.09 Range $153.35 - $198.00
Q1 2023
Shares 1,501,493 Value ($000) $277,086 Avg Close $168.70 Range $144.51 - $184.97
Q4 2022
Shares 1,501,493 Value ($000) $222,146 Avg Close $137.60 Range $108.89 - $150.87
Q3 2022
Shares 1,439,993 Value ($000) $203,269 Avg Close $146.09 Range $122.68 - $172.74
Q2 2022
Shares 1,350,993 Value ($000) $176,534 Avg Close $133.79 Range $112.07 - $154.51
Q1 2022
Shares 1,127,593 Value ($000) $164,110 Avg Close $192.01 Range $133.94 - $291.15
Q4 2021
Shares 849,971 Value ($000) $248,855 Avg Close $284.79 Range $262.52 - $305.21
Q3 2021
Shares 832,540 Value ($000) $225,377 Avg Close $271.15 Range $241.42 - $288.27
Q2 2021
Shares 826,210 Value ($000) $200,315 Avg Close $228.17 Range $205.10 - $250.49
Q1 2021
Shares 594,956 Value ($000) $136,638 Avg Close $251.21 Range $217.65 - $284.86
Q4 2020
Shares 469,416 Value ($000) $125,982 Avg Close $249.38 Range $218.23 - $273.33
Q3 2020
Shares 450,390 Value ($000) $106,319 Avg Close $224.17 Range $203.81 - $248.88
Q2 2020
Shares 388,776 Value ($000) $88,637 Avg Close $219.47 Range $173.15 - $258.00
Q1 2020
Shares 382,915 Value ($000) $67,822 Avg Close $171.51 Range $143.90 - $187.85
Q4 2019
Shares 382,187 Value ($000) $60,408 Avg Close $150.33 Range $140.16 - $160.06
Q3 2019
Shares 371,155 Value ($000) $55,224 Avg Close $151.90 Range $139.36 - $160.25
Q2 2019
Shares 372,258 Value ($000) $55,399 Avg Close $137.22 Range $118.93 - $148.93
Q1 2019
Shares 363,569 Value ($000) $50,274 Avg Close $125.54 Range $101.87 - $139.48
Q4 2018
Shares 342,221 Value ($000) $36,744 Avg Close $111.51 Range $98.23 - $126.89
Q3 2018
Shares 310,461 Value ($000) $38,665 Avg Close $110.93 Range $96.14 - $124.74
Q2 2018
Shares 249,543 Value ($000) $24,368 Avg Close $95.08 Range $83.16 - $102.32
Q1 2018
Shares 232,000 Value ($000) $20,404 Avg Close $87.17 Range $80.69 - $96.45
Q4 2017
Shares 120,900 Value ($000) $10,252 Avg Close $86.74 Range $84.05 - $91.04
Q3 2017
Shares 120,900 Value ($000) $10,465 Avg Close $88.42 Range $81.01 - $100.00
Q2 2017
Shares 100,900 Value ($000) $9,200 Avg Close $91.81 Range $82.71 - $104.71
Q1 2017
Shares 80,900 Value ($000) $7,545 Avg Close $82.32 Range $66.79 - $96.68
Q4 2016
Shares 80,900 Value ($000) $5,453 Avg Close $61.46 Range $53.78 - $68.88
Q3 2016
Shares 25,900 Value ($000) $1,541 Avg Close $56.42 Range $51.10 - $60.52
Q2 2016
Shares 25,900 Value ($000) $1,360 Avg Close $47.10 Range $41.19 - $53.55
Q1 2016
Shares 25,900 Value ($000) $1,084 Avg Close $37.61 Range $33.03 - $41.93
Q4 2015
Shares 25,900 Value ($000) $1,075 Avg Close $40.86 Range $37.40 - $43.76
Q3 2015
Shares 25,900 Value ($000) $999 Avg Close $40.86 Range $35.33 - $46.00