BlackRock’s Masimo MASI Stock Holding History
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
PCM
PCM
HI
VCM
VPM
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.