Marshall Wace’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 | $16.1M | Sell |
90,657
-128,655
| -59% | -$20.2M | 0.02% | 778 |
|
|
2025
Q4 | $28.5M | Buy |
219,312
+85,190
| +64% | +$12.2M | 0.03% | 516 |
|
|
2025
Q3 | $19.8M | Buy |
134,122
+126,914
| +1,761% | +$19.2M | 0.02% | 662 |
|
|
2025
Q2 | $1.21M | Sell |
7,208
-3,766
| -34% | -$601K | ﹤0.01% | 1778 |
|
|
2025
Q1 | $1.83M | Sell |
10,974
-2,315
| -17% | -$402K | ﹤0.01% | 1501 |
|
|
2024
Q4 | $2.2M | Buy |
+13,289
| New | +$2.1M | ﹤0.01% | 1395 |
|
|
2024
Q3 | – | Sell |
-94,798
| Closed | -$11.9M | – | 2776 |
|
|
2024
Q2 | $11.9M | Buy |
94,798
+4,591
| +5% | +$605K | 0.02% | 654 |
|
|
2024
Q1 | $13.2M | Sell |
90,207
-98,846
| -52% | -$12.8M | 0.02% | 652 |
|
|
2023
Q4 | $22.2M | Buy |
+189,053
| New | +$17.6M | 0.04% | 451 |
|
|
2023
Q3 | – | Sell |
-14,899
| Closed | -$2.45M | – | 2488 |
|
|
2023
Q2 | $2.45M | Sell |
14,899
-1,033
| -6% | -$180K | ﹤0.01% | 1305 |
|
|
2023
Q1 | $2.94M | Sell |
15,932
-38,690
| -71% | -$6.53M | 0.01% | 1253 |
|
|
2022
Q4 | $8.08M | Buy |
54,622
+23,509
| +76% | +$3.23M | 0.02% | 919 |
|
|
2022
Q3 | $4.39M | Sell |
31,113
-259,685
| -89% | -$37.9M | 0.01% | 1460 |
|
|
2022
Q2 | $38M | Sell |
290,798
-677,296
| -70% | -$90.6M | 0.08% | 267 |
|
|
2022
Q1 | $141M | Buy |
968,094
+967,981
| +856,620% | +$186M | 0.27% | 69 |
|
|
2021
Q4 | $32K | Buy |
+113
| New | +$32.2K | ﹤0.01% | 3642 |
|
|
2021
Q2 | – | Sell |
-3,074
| Closed | -$706K | – | 2889 |
|
|
2021
Q1 | $706K | Buy |
3,074
+377
| +14% | +$94.7K | ﹤0.01% | 1806 |
|
|
2020
Q4 | $724K | Buy |
+2,697
| New | +$673K | ﹤0.01% | 1334 |
|
|
2020
Q1 | – | Sell |
-71,470
| Closed | -$11.3M | – | 1883 |
|
|
2019
Q4 | $11.3M | Sell |
71,470
-28,441
| -28% | -$4.28M | 0.08% | 300 |
|
|
2019
Q3 | $14.9M | Sell |
99,911
-85,847
| -46% | -$13M | 0.12% | 204 |
|
|
2019
Q2 | $27.6M | Sell |
185,758
-47,294
| -20% | -$6.49M | 0.23% | 91 |
|
|
2019
Q1 | $32.2M | Sell |
233,052
-74,584
| -24% | -$9.36M | 0.3% | 58 |
|
|
2018
Q4 | $33M | Sell |
307,636
-246,389
| -44% | -$27.5M | 0.34% | 52 |
|
|
2018
Q3 | $69M | Buy |
554,025
+368,958
| +199% | +$40.9M | 0.59% | 25 |
|
|
2018
Q2 | $18.1M | Buy |
+185,067
| New | +$17.6M | 0.27% | 110 |
|
|
2016
Q2 | – | Sell |
-58,609
| Closed | -$2.45M | – | 1083 |
|
|
2016
Q1 | $2.45M | Buy |
+58,609
| New | +$2.2M | 0.02% | 517 |
|
|
2015
Q1 | – | Sell |
-86,337
| Closed | -$2.27M | – | 883 |
|
|
2014
Q4 | $2.27M | Sell |
86,337
-106,773
| -55% | -$2.64M | 0.03% | 435 |
|
|
2014
Q3 | $4.11M | Buy |
193,110
+166,746
| +632% | +$3.81M | 0.06% | 321 |
|
|
2014
Q2 | $622K | Buy |
+26,364
| New | +$654K | 0.01% | 573 |
|
Other funds holding MASI
PCM
PCM
HI
VCM
VPM
Marshall Wace's MASI Position: Q1 2026 in Review
Marshall Wace reduced its Masimo (MASI) stake by 59% in Q1 2026, selling an estimated $20.2M and leaving 90,657 shares worth $16.1M. The position accounts for 0.02% of the portfolio, ranked #778.
Marshall Wace first reported a position in MASI in Q2 2014 and has held it in 29 quarters since. The position peaked at $141M in Q1 2022. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.
- Marshall Wace held 90,657 shares of Masimo worth $16.1M as of Q1 2026.
- Marshall Wace sold 128,655 Masimo shares in Q1 2026, an estimated $20.2M.
- Masimo made up 0.02% of Marshall Wace's portfolio in Q1 2026, its #778 holding.
- Marshall Wace first reported a position in Masimo in Q2 2014 and has held it in 29 quarters since.
- Marshall Wace's Masimo position peaked at $141M in Q1 2022.
- 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.
Based on Marshall Wace's 13F filing for Q1 2026, filed 15 May 2026.