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 | – | Sell |
-7,300
| Closed | -$949K | – | 12406 |
|
|
2025
Q4 | $949K | Buy |
7,300
+5,800
| +387% | +$831K | ﹤0.01% | 6233 |
|
|
2025
Q3 | $221K | Buy |
+1,500
| New | +$227K | ﹤0.01% | 9477 |
|
|
2024
Q4 | – | Sell |
-35,600
| Closed | -$4.75M | – | 10087 |
|
|
2024
Q3 | $4.75M | Buy |
35,600
+22,200
| +166% | +$2.58M | ﹤0.01% | 2945 |
|
|
2024
Q2 | $1.69M | Sell |
13,400
-2,000
| -13% | -$263K | ﹤0.01% | 4794 |
|
|
2024
Q1 | $2.26M | Buy |
15,400
+7,200
| +88% | +$930K | ﹤0.01% | 3914 |
|
|
2023
Q4 | $961K | Sell |
8,200
-40,000
| -83% | -$3.73M | ﹤0.01% | 5632 |
|
|
2023
Q3 | $4.23M | Buy |
48,200
+46,800
| +3,343% | +$5.45M | ﹤0.01% | 2855 |
|
|
2023
Q2 | $230K | Sell |
1,400
-200
| -13% | -$34.8K | ﹤0.01% | 7498 |
|
|
2023
Q1 | $295K | Buy |
+1,600
| New | +$270K | ﹤0.01% | 7226 |
|
|
2022
Q3 | – | Sell |
-2,300
| Closed | -$301K | – | 10131 |
|
|
2022
Q2 | $301K | Buy |
2,300
+700
| +44% | +$93.7K | ﹤0.01% | 7602 |
|
|
2022
Q1 | $233K | Sell |
1,600
-1,100
| -41% | -$211K | ﹤0.01% | 8803 |
|
|
2021
Q4 | $791K | Buy |
+2,700
| New | +$769K | ﹤0.01% | 6382 |
|
|
2021
Q3 | – | Sell |
-3,900
| Closed | -$946K | – | 10395 |
|
|
2021
Q2 | $946K | Sell |
3,900
-700
| -15% | -$160K | ﹤0.01% | 5959 |
|
|
2021
Q1 | $1.06M | Sell |
4,600
-5,800
| -56% | -$1.46M | ﹤0.01% | 5351 |
|
|
2020
Q4 | $2.79M | Buy |
10,400
+7,500
| +259% | +$1.87M | ﹤0.01% | 2917 |
|
|
2020
Q3 | $685K | Sell |
2,900
-13,500
| -82% | -$3.03M | ﹤0.01% | 4684 |
|
|
2020
Q2 | $3.74M | Buy |
+16,400
| New | +$3.6M | ﹤0.01% | 2210 |
|
Other funds holding MASI
Jane Street's MASI Position: Q2 2026 in Review
Jane Street sold out of Masimo (MASI) in Q2 2026, closing a stake of 1,215 shares — an estimated $216K sold.
Jane Street first reported a position in MASI in Q3 2013 and held it in 36 quarters. The position peaked at $18.2M in Q3 2022. 2 funds tracked by Wall St. Rank hold MASI as of Q2 2026.
- Jane Street reported no remaining Masimo position as of Q2 2026 after selling out during the quarter.
- Jane Street sold 1,215 Masimo shares in Q2 2026, an estimated $216K.
- Jane Street first reported a position in Masimo in Q3 2013 and held it in 36 quarters.
- Jane Street's Masimo position peaked at $18.2M in Q3 2022.
- 2 funds tracked by Wall St. Rank held Masimo as of Q2 2026.
Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.