Citadel Advisors’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 | $4.23M | Buy |
23,800
+20,700
| +668% | +$3.25M | ﹤0.01% | 4616 |
|
|
2025
Q4 | $403K | Buy |
3,100
+500
| +19% | +$71.6K | ﹤0.01% | 9522 |
|
|
2025
Q3 | $384K | Buy |
2,600
+500
| +24% | +$75.7K | ﹤0.01% | 9768 |
|
|
2025
Q2 | $353K | Sell |
2,100
-3,000
| -59% | -$479K | ﹤0.01% | 9423 |
|
|
2025
Q1 | $850K | Sell |
5,100
-13,300
| -72% | -$2.31M | ﹤0.01% | 7317 |
|
|
2024
Q4 | $3.04M | Sell |
18,400
-16,000
| -47% | -$2.53M | ﹤0.01% | 4813 |
|
|
2024
Q3 | $4.59M | Sell |
34,400
-6,700
| -16% | -$777K | ﹤0.01% | 4064 |
|
|
2024
Q2 | $5.18M | Sell |
41,100
-12,500
| -23% | -$1.65M | ﹤0.01% | 3700 |
|
|
2024
Q1 | $7.87M | Sell |
53,600
-21,500
| -29% | -$2.78M | ﹤0.01% | 3268 |
|
|
2023
Q4 | $8.8M | Buy |
75,100
+11,800
| +19% | +$1.1M | ﹤0.01% | 3018 |
|
|
2023
Q3 | $5.55M | Buy |
63,300
+52,900
| +509% | +$6.16M | ﹤0.01% | 3502 |
|
|
2023
Q2 | $1.71M | Sell |
10,400
-2,400
| -19% | -$418K | ﹤0.01% | 5441 |
|
|
2023
Q1 | $2.36M | Sell |
12,800
-13,000
| -50% | -$2.19M | ﹤0.01% | 5045 |
|
|
2022
Q4 | $3.82M | Buy |
25,800
+22,000
| +579% | +$3.03M | ﹤0.01% | 4323 |
|
|
2022
Q3 | $536K | Sell |
3,800
-14,500
| -79% | -$2.12M | ﹤0.01% | 8318 |
|
|
2022
Q2 | $2.39M | Sell |
18,300
-11,200
| -38% | -$1.5M | ﹤0.01% | 5198 |
|
|
2022
Q1 | $4.29M | Buy |
29,500
+23,500
| +392% | +$4.51M | ﹤0.01% | 4476 |
|
|
2021
Q4 | $1.76M | Sell |
6,000
-5,500
| -48% | -$1.57M | ﹤0.01% | 6551 |
|
|
2021
Q3 | $3.11M | Buy |
11,500
+600
| +6% | +$163K | ﹤0.01% | 5272 |
|
|
2021
Q2 | $2.64M | Sell |
10,900
-18,600
| -63% | -$4.24M | ﹤0.01% | 5910 |
|
|
2021
Q1 | $6.78M | Buy |
29,500
+13,200
| +81% | +$3.32M | ﹤0.01% | 3656 |
|
|
2020
Q4 | $4.38M | Sell |
16,300
-8,800
| -35% | -$2.19M | ﹤0.01% | 3904 |
|
|
2020
Q3 | $5.92M | Sell |
25,100
-9,000
| -26% | -$2.02M | ﹤0.01% | 2913 |
|
|
2020
Q2 | $7.77M | Buy |
34,100
+24,000
| +238% | +$5.27M | ﹤0.01% | 2522 |
|
|
2020
Q1 | $1.79M | Buy |
10,100
+4,700
| +87% | +$806K | ﹤0.01% | 4325 |
|
|
2019
Q4 | $854K | Sell |
5,400
-2,700
| -33% | -$406K | ﹤0.01% | 5882 |
|
|
2019
Q3 | $1.21M | Sell |
8,100
-10,300
| -56% | -$1.56M | ﹤0.01% | 5267 |
|
|
2019
Q2 | $2.74M | Sell |
18,400
-4,900
| -21% | -$672K | ﹤0.01% | 4004 |
|
|
2019
Q1 | $3.22M | Buy |
23,300
+11,400
| +96% | +$1.43M | ﹤0.01% | 3645 |
|
|
2018
Q4 | $1.28M | Buy |
11,900
+6,000
| +102% | +$669K | ﹤0.01% | 4912 |
|
|
2018
Q3 | $735K | Sell |
5,900
-1,700
| -22% | -$189K | ﹤0.01% | 6068 |
|
|
2018
Q2 | $742K | Sell |
7,600
-6,900
| -48% | -$656K | ﹤0.01% | 5729 |
|
|
2018
Q1 | $1.27M | Buy |
14,500
+9,800
| +209% | +$854K | ﹤0.01% | 4440 |
|
|
2017
Q4 | $399K | Sell |
4,700
-4,800
| -51% | -$416K | ﹤0.01% | 6001 |
|
|
2017
Q3 | $822K | Sell |
9,500
-4,500
| -32% | -$398K | ﹤0.01% | 4588 |
|
|
2017
Q2 | $1.28M | Sell |
14,000
-1,200
| -8% | -$110K | ﹤0.01% | 3747 |
|
|
2017
Q1 | $1.42M | Buy |
15,200
+10,100
| +198% | +$831K | ﹤0.01% | 3500 |
|
|
2016
Q4 | $344K | Buy |
+5,100
| New | +$313K | ﹤0.01% | 5486 |
|
|
2015
Q4 | – | Sell |
-2,500
| Closed | -$96K | – | 8987 |
|
|
2015
Q3 | $96K | Sell |
2,500
-1,400
| -36% | -$57.2K | ﹤0.01% | 6988 |
|
|
2015
Q2 | $151K | Buy |
3,900
+300
| +8% | +$10.7K | ﹤0.01% | 6652 |
|
|
2015
Q1 | $119K | Buy |
+3,600
| New | +$103K | ﹤0.01% | 6699 |
|
|
2014
Q4 | – | Sell |
-1,200
| Closed | -$26K | – | 8628 |
|
|
2014
Q3 | $26K | Sell |
1,200
-800
| -40% | -$18.3K | ﹤0.01% | 7288 |
|
|
2014
Q2 | $47K | Sell |
2,000
-100
| -5% | -$2.48K | ﹤0.01% | 6781 |
|
|
2014
Q1 | $57K | Sell |
2,100
-1,000
| -32% | -$28.5K | ﹤0.01% | 6669 |
|
|
2013
Q4 | $91K | Buy |
3,100
+2,100
| +210% | +$58.8K | ﹤0.01% | 5680 |
|
|
2013
Q3 | $27K | Sell |
1,000
-1,800
| -64% | -$44.4K | ﹤0.01% | 6075 |
|
|
2013
Q2 | $59K | Buy |
+2,800
| New | +$58.9K | ﹤0.01% | 5573 |
|
Other funds holding MASI
PCM
PCM
HI
VCM
VPM
Citadel Advisors's MASI Position: Q1 2026 in Review
Citadel Advisors increased its Masimo (MASI) stake by 554% in Q1 2026, buying an estimated $37.4M and bringing the position to 281,366 shares worth $50M. The position accounts for 0.01% of the portfolio, ranked #1359.
Citadel Advisors first reported a position in MASI in Q2 2013 and has held it in 50 quarters since. The position peaked at $198M in Q1 2024. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.
- Citadel Advisors held 281,366 shares of Masimo worth $50M as of Q1 2026.
- Citadel Advisors bought 238,314 Masimo shares in Q1 2026, an estimated $37.4M.
- Masimo made up 0.01% of Citadel Advisors's portfolio in Q1 2026, its #1359 holding.
- Citadel Advisors first reported a position in Masimo in Q2 2013 and has held it in 50 quarters since.
- Citadel Advisors's Masimo position peaked at $198M in Q1 2024.
- 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.
Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.