Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake
Trade Value Portfolio Weight Portfolio Position
2026
Q1
$826M Sell
4,644,578
-4,211,041
-48% -$661M 0.01% 791
2025
Q4
$1.15B Sell
8,855,619
-1,505,472
-15% -$216M 0.02% 628
2025
Q3
$1.53B Sell
10,361,091
-146,235
-1% -$22.1M 0.03% 504
2025
Q2
$1.77B Buy
10,507,326
+635,898
+6% +$102M 0.03% 432
2025
Q1
$1.64B Buy
9,871,428
+1,173,215
+13% +$204M 0.03% 440
2024
Q4
$1.44B Sell
8,698,213
-124,056
-1% -$19.6M 0.03% 495
2024
Q3
$1.18B Sell
8,822,269
-528,970
-6% -$61.4M 0.02% 561
2024
Q2
$1.18B Buy
9,351,239
+1,470,865
+19% +$194M 0.03% 523
2024
Q1
$1.16B Buy
7,880,374
+2,221,243
+39% +$287M 0.03% 546
2023
Q4
$663M Buy
5,659,131
+246,798
+5% +$23M 0.02% 790
2023
Q3
$475M Sell
5,412,333
-707,790
-12% -$82.4M 0.01% 933
2023
Q2
$1.01B Buy
6,120,123
+178,267
+3% +$31M 0.03% 542
2023
Q1
$1.1B Sell
5,941,856
-15,092
-0.3% -$2.55M 0.03% 511
2022
Q4
$881M Buy
5,956,948
+542,124
+10% +$74.6M 0.03% 560
2022
Q3
$764M Sell
5,414,824
-360,404
-6% -$52.7M 0.03% 592
2022
Q2
$755M Sell
5,775,228
-1,100,319
-16% -$147M 0.02% 620
2022
Q1
$1B Sell
6,875,547
-2,150,827
-24% -$413M 0.03% 580
2021
Q4
$2.64B Buy
9,026,374
+133,072
+1% +$37.9M 0.07% 284
2021
Q3
$2.41B Sell
8,893,302
-24,811
-0.3% -$6.73M 0.07% 288
2021
Q2
$2.16B Buy
8,918,113
+763,064
+9% +$174M 0.06% 320
2021
Q1
$1.87B Sell
8,155,049
-161,475
-2% -$40.6M 0.06% 343
2020
Q4
$2.23B Buy
8,316,524
+418,292
+5% +$104M 0.07% 269
2020
Q3
$1.86B Buy
7,898,232
+458,222
+6% +$103M 0.07% 273
2020
Q2
$1.7B Buy
7,440,010
+761,539
+11% +$167M 0.07% 279
2020
Q1
$1.18B Buy
6,678,471
+133,750
+2% +$22.9M 0.06% 308
2019
Q4
$1.03B Sell
6,544,721
-339,810
-5% -$51.1M 0.04% 456
2019
Q3
$1.02B Sell
6,884,531
-119,359
-2% -$18.1M 0.04% 426
2019
Q2
$1.04B Buy
7,003,890
+22,277
+0.3% +$3.06M 0.04% 417
2019
Q1
$965M Sell
6,981,613
-185,656
-3% -$23.3M 0.04% 427
2018
Q4
$770M Sell
7,167,269
-1,144,631
-14% -$128M 0.04% 462
2018
Q3
$1.04B Buy
8,311,900
+1,562,019
+23% +$173M 0.04% 417
2018
Q2
$659M Sell
6,749,881
-551,471
-8% -$52.4M 0.03% 573
2018
Q1
$642M Buy
7,301,352
+53,887
+0.7% +$4.7M 0.03% 583
2017
Q4
$615M Sell
7,247,465
-178,773
-2% -$15.5M 0.03% 597
2017
Q3
$643M Sell
7,426,238
-488,992
-6% -$43.2M 0.03% 540
2017
Q2
$722M Buy
7,915,230
+550,995
+7% +$50.6M 0.04% 485
2017
Q1
$687M Buy
7,364,235
+7,210,051
+4,676% +$594M 0.04% 502
2016
Q4
$10.4M Sell
154,184
-17,898
-10% -$1.1M 0.01% 730
2016
Q3
$10.2M Buy
172,082
+91,110
+113% +$5.14M 0.01% 719
2016
Q2
$4.25M Buy
80,972
+43,976
+119% +$2.07M 0.01% 920
2016
Q1
$1.55M Sell
36,996
-15,771
-30% -$593K ﹤0.01% 1198
2015
Q4
$2.19M Sell
52,767
-82,723
-61% -$3.38M ﹤0.01% 1046
2015
Q3
$5.22M Buy
135,490
+12,854
+10% +$525K 0.01% 773
2015
Q2
$4.75M Sell
122,636
-439
-0.4% -$15.7K 0.01% 869
2015
Q1
$4.06M Buy
123,075
+34,600
+39% +$995K 0.01% 900
2014
Q4
$2.33M Buy
88,475
+31,200
+54% +$770K ﹤0.01% 1011
2014
Q3
$1.22M Buy
57,275
+2,600
+5% +$59.4K ﹤0.01% 1168
2014
Q2
$1.29M Buy
54,675
+53,104
+3,380% +$1.32M ﹤0.01% 1144
2014
Q1
$43K Sell
1,571
-3,157
-67% -$90K ﹤0.01% 1979
2013
Q4
$138K Sell
4,728
-54
-1% -$1.51K ﹤0.01% 1682
2013
Q3
$127K Hold
4,782
﹤0.01% 1604
2013
Q2
$102K Buy
+4,782
New +$101K ﹤0.01% 1656

Other funds holding MASI

BlackRock's MASI Position: Q1 2026 in Review

BlackRock reduced its Masimo (MASI) stake by 48% in Q1 2026, selling an estimated $661M and leaving 4,644,578 shares worth $826M. The position accounts for 0.01% of the portfolio, ranked #791.

BlackRock first reported a position in MASI in Q2 2013 and has held it in 52 quarters since. The position peaked at $2.64B in Q4 2021. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • BlackRock held 4,644,578 shares of Masimo worth $826M as of Q1 2026.
  • BlackRock sold 4,211,041 Masimo shares in Q1 2026, an estimated $661M.
  • Masimo made up 0.01% of BlackRock's portfolio in Q1 2026, its #791 holding.
  • BlackRock first reported a position in Masimo in Q2 2013 and has held it in 52 quarters since.
  • BlackRock's Masimo position peaked at $2.64B in Q4 2021.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on BlackRock's 13F filing for Q1 2026, filed 13 May 2026.