Jane Street’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 | $216K | Sell |
1,215
-101,666
| -99% | -$16M | ﹤0.01% | 9974 |
|
|
2025
Q4 | $13.4M | Buy |
+102,881
| New | +$14.7M | ﹤0.01% | 1984 |
|
|
2025
Q3 | – | Sell |
-1,872
| Closed | -$283K | – | 11372 |
|
|
2025
Q2 | $315K | Sell |
1,872
-178
| -9% | -$28.4K | ﹤0.01% | 7779 |
|
|
2025
Q1 | $342K | Sell |
2,050
-28,437
| -93% | -$4.93M | ﹤0.01% | 7584 |
|
|
2024
Q4 | $5.04M | Buy |
30,487
+5,807
| +24% | +$917K | ﹤0.01% | 2650 |
|
|
2024
Q3 | $3.29M | Sell |
24,680
-4,923
| -17% | -$571K | ﹤0.01% | 3553 |
|
|
2024
Q2 | $3.73M | Buy |
29,603
+5,239
| +22% | +$690K | ﹤0.01% | 3437 |
|
|
2024
Q1 | $3.58M | Sell |
24,364
-62,142
| -72% | -$8.02M | ﹤0.01% | 3125 |
|
|
2023
Q4 | $10.1M | Sell |
86,506
-90,109
| -51% | -$8.4M | ﹤0.01% | 1937 |
|
|
2023
Q3 | $15.5M | Buy |
176,615
+175,106
| +11,604% | +$20.4M | 0.01% | 1331 |
|
|
2023
Q2 | $248K | Sell |
1,509
-9,691
| -87% | -$1.69M | ﹤0.01% | 7399 |
|
|
2023
Q1 | $2.07M | Sell |
11,200
-7,870
| -41% | -$1.33M | ﹤0.01% | 3762 |
|
|
2022
Q4 | $2.82M | Sell |
19,070
-109,674
| -85% | -$15.1M | ﹤0.01% | 3316 |
|
|
2022
Q3 | $18.2M | Buy |
128,744
+113,682
| +755% | +$16.6M | 0.01% | 1151 |
|
|
2022
Q2 | $1.97M | Buy |
15,062
+4,403
| +41% | +$589K | ﹤0.01% | 4186 |
|
|
2022
Q1 | $1.55M | Buy |
10,659
+5,405
| +103% | +$1.04M | ﹤0.01% | 5237 |
|
|
2021
Q4 | $1.54M | Buy |
5,254
+2,158
| +70% | +$615K | ﹤0.01% | 5022 |
|
|
2021
Q3 | $838K | Sell |
3,096
-4,126
| -57% | -$1.12M | ﹤0.01% | 6264 |
|
|
2021
Q2 | $1.75M | Sell |
7,222
-15,029
| -68% | -$3.43M | ﹤0.01% | 4590 |
|
|
2021
Q1 | $5.11M | Buy |
22,251
+12,225
| +122% | +$3.07M | ﹤0.01% | 2376 |
|
|
2020
Q4 | $2.69M | Buy |
10,026
+1,805
| +22% | +$450K | ﹤0.01% | 2978 |
|
|
2020
Q3 | $1.94M | Buy |
8,221
+2,769
| +51% | +$621K | ﹤0.01% | 3088 |
|
|
2020
Q2 | $1.24M | Buy |
5,452
+1,993
| +58% | +$437K | ﹤0.01% | 3755 |
|
|
2020
Q1 | $613K | Buy |
3,459
+780
| +29% | +$134K | ﹤0.01% | 3401 |
|
|
2019
Q4 | $423K | Sell |
2,679
-104
| -4% | -$15.6K | ﹤0.01% | 3886 |
|
|
2019
Q3 | $414K | Buy |
+2,783
| New | +$423K | ﹤0.01% | 3773 |
|
|
2019
Q2 | – | Sell |
-2,295
| Closed | -$317K | – | 5493 |
|
|
2019
Q1 | $317K | Buy |
+2,295
| New | +$288K | ﹤0.01% | 4191 |
|
|
2018
Q4 | – | Sell |
-11,917
| Closed | -$1.48M | – | 5389 |
|
|
2018
Q3 | $1.48M | Sell |
11,917
-107,467
| -90% | -$11.9M | ﹤0.01% | 2249 |
|
|
2018
Q2 | $11.7M | Buy |
119,384
+115,447
| +2,932% | +$11M | 0.03% | 523 |
|
|
2018
Q1 | $346K | Sell |
3,937
-4,090
| -51% | -$357K | ﹤0.01% | 3870 |
|
|
2017
Q4 | $681K | Buy |
8,027
+4,364
| +119% | +$379K | ﹤0.01% | 2812 |
|
|
2017
Q3 | $317K | Buy |
+3,663
| New | +$324K | ﹤0.01% | 3625 |
|
|
2017
Q2 | – | Sell |
-10,966
| Closed | -$1.02M | – | 4661 |
|
|
2017
Q1 | $1.02M | Sell |
10,966
-7,624
| -41% | -$628K | ﹤0.01% | 2050 |
|
|
2016
Q4 | $1.25M | Sell |
18,590
-6,210
| -25% | -$382K | 0.01% | 1801 |
|
|
2016
Q3 | $1.48M | Buy |
+24,800
| New | +$1.4M | 0.01% | 1519 |
|
|
2013
Q4 | – | Sell |
-14,738
| Closed | -$393K | – | 2675 |
|
|
2013
Q3 | $393K | Buy |
+14,738
| New | +$363K | ﹤0.01% | 1891 |
|
Other funds holding MASI
PCM
PCM
HI
VCM
VPM
Jane Street's MASI Position: Q1 2026 in Review
Jane Street reduced its Masimo (MASI) stake by 99% in Q1 2026, selling an estimated $16M and leaving 1,215 shares worth $216K. The position accounts for ﹤0.01% of the portfolio, ranked #9974.
Jane Street first reported a position in MASI in Q3 2013 and has held it in 36 quarters since. The position peaked at $18.2M in Q3 2022. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.
- Jane Street held 1,215 shares of Masimo worth $216K as of Q1 2026.
- Jane Street sold 101,666 Masimo shares in Q1 2026, an estimated $16M.
- Masimo made up ﹤0.01% of Jane Street's portfolio in Q1 2026, its #9974 holding.
- Jane Street first reported a position in Masimo in Q3 2013 and has held it in 36 quarters since.
- Jane Street's Masimo position peaked at $18.2M in Q3 2022.
- 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.
Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.