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 | $4.91M | Buy |
27,600
+22,500
| +441% | +$3.53M | ﹤0.01% | 4367 |
|
|
2025
Q4 | $663K | Sell |
5,100
-5,700
| -53% | -$816K | ﹤0.01% | 8328 |
|
|
2025
Q3 | $1.59M | Buy |
10,800
+3,100
| +40% | +$469K | ﹤0.01% | 6529 |
|
|
2025
Q2 | $1.3M | Hold |
7,700
| – | – | ﹤0.01% | 6544 |
|
|
2025
Q1 | $1.28M | Sell |
7,700
-3,300
| -30% | -$573K | ﹤0.01% | 6402 |
|
|
2024
Q4 | $1.82M | Sell |
11,000
-18,800
| -63% | -$2.97M | ﹤0.01% | 5834 |
|
|
2024
Q3 | $3.97M | Buy |
29,800
+4,600
| +18% | +$534K | ﹤0.01% | 4326 |
|
|
2024
Q2 | $3.17M | Sell |
25,200
-6,500
| -21% | -$856K | ﹤0.01% | 4481 |
|
|
2024
Q1 | $4.66M | Sell |
31,700
-199,400
| -86% | -$25.7M | ﹤0.01% | 4055 |
|
|
2023
Q4 | $27.1M | Sell |
231,100
-338,100
| -59% | -$31.5M | 0.01% | 1715 |
|
|
2023
Q3 | $49.9M | Buy |
569,200
+543,400
| +2,106% | +$63.2M | 0.01% | 1078 |
|
|
2023
Q2 | $4.25M | Sell |
25,800
-11,900
| -32% | -$2.07M | ﹤0.01% | 3906 |
|
|
2023
Q1 | $6.96M | Buy |
37,700
+12,100
| +47% | +$2.04M | ﹤0.01% | 3292 |
|
|
2022
Q4 | $3.79M | Buy |
25,600
+17,100
| +201% | +$2.35M | ﹤0.01% | 4345 |
|
|
2022
Q3 | $1.2M | Sell |
8,500
-1,400
| -14% | -$205K | ﹤0.01% | 6594 |
|
|
2022
Q2 | $1.29M | Sell |
9,900
-12,000
| -55% | -$1.61M | ﹤0.01% | 6440 |
|
|
2022
Q1 | $3.19M | Buy |
21,900
+10,700
| +96% | +$2.05M | ﹤0.01% | 5040 |
|
|
2021
Q4 | $3.28M | Sell |
11,200
-4,900
| -30% | -$1.4M | ﹤0.01% | 5160 |
|
|
2021
Q3 | $4.36M | Sell |
16,100
-5,700
| -26% | -$1.55M | ﹤0.01% | 4577 |
|
|
2021
Q2 | $5.29M | Buy |
21,800
+3,400
| +18% | +$776K | ﹤0.01% | 4315 |
|
|
2021
Q1 | $4.23M | Buy |
18,400
+10,500
| +133% | +$2.64M | ﹤0.01% | 4649 |
|
|
2020
Q4 | $2.12M | Sell |
7,900
-21,900
| -73% | -$5.46M | ﹤0.01% | 5241 |
|
|
2020
Q3 | $7.04M | Buy |
29,800
+3,100
| +12% | +$695K | ﹤0.01% | 2695 |
|
|
2020
Q2 | $6.09M | Buy |
26,700
+14,400
| +117% | +$3.16M | ﹤0.01% | 2816 |
|
|
2020
Q1 | $2.18M | Buy |
12,300
+3,000
| +32% | +$515K | ﹤0.01% | 4005 |
|
|
2019
Q4 | $1.47M | Sell |
9,300
-2,600
| -22% | -$391K | ﹤0.01% | 4909 |
|
|
2019
Q3 | $1.77M | Buy |
11,900
+3,600
| +43% | +$547K | ﹤0.01% | 4673 |
|
|
2019
Q2 | $1.24M | Sell |
8,300
-11,900
| -59% | -$1.63M | ﹤0.01% | 5352 |
|
|
2019
Q1 | $2.79M | Buy |
20,200
+1,600
| +9% | +$201K | ﹤0.01% | 3886 |
|
|
2018
Q4 | $2M | Sell |
18,600
-6,600
| -26% | -$736K | ﹤0.01% | 4153 |
|
|
2018
Q3 | $3.14M | Buy |
25,200
+14,800
| +142% | +$1.64M | ﹤0.01% | 3654 |
|
|
2018
Q2 | $1.02M | Sell |
10,400
-500
| -5% | -$47.5K | ﹤0.01% | 5183 |
|
|
2018
Q1 | $959K | Sell |
10,900
-4,900
| -31% | -$427K | ﹤0.01% | 4872 |
|
|
2017
Q4 | $1.34M | Buy |
15,800
+3,800
| +32% | +$330K | ﹤0.01% | 4210 |
|
|
2017
Q3 | $1.04M | Sell |
12,000
-8,400
| -41% | -$743K | ﹤0.01% | 4276 |
|
|
2017
Q2 | $1.86M | Buy |
20,400
+10,000
| +96% | +$918K | ﹤0.01% | 3262 |
|
|
2017
Q1 | $970K | Buy |
+10,400
| New | +$856K | ﹤0.01% | 4043 |
|
|
2016
Q3 | – | Sell |
-7,200
| Closed | -$378K | – | 7535 |
|
|
2016
Q2 | $378K | Buy |
7,200
+1,200
| +20% | +$56.5K | ﹤0.01% | 4880 |
|
|
2016
Q1 | $251K | Buy |
6,000
+3,300
| +122% | +$124K | ﹤0.01% | 5325 |
|
|
2015
Q4 | $112K | Sell |
2,700
-7,000
| -72% | -$286K | ﹤0.01% | 6563 |
|
|
2015
Q3 | $374K | Buy |
9,700
+600
| +7% | +$24.5K | ﹤0.01% | 5234 |
|
|
2015
Q2 | $353K | Buy |
9,100
+5,300
| +139% | +$190K | ﹤0.01% | 5509 |
|
|
2015
Q1 | $125K | Buy |
3,800
+2,400
| +171% | +$69K | ﹤0.01% | 6656 |
|
|
2014
Q4 | $37K | Sell |
1,400
-1,100
| -44% | -$27.1K | ﹤0.01% | 7409 |
|
|
2014
Q3 | $53K | Buy |
2,500
+2,000
| +400% | +$45.7K | ﹤0.01% | 6866 |
|
|
2014
Q2 | $12K | Sell |
500
-4,800
| -91% | -$119K | ﹤0.01% | 7519 |
|
|
2014
Q1 | $145K | Buy |
5,300
+1,400
| +36% | +$39.9K | ﹤0.01% | 5832 |
|
|
2013
Q4 | $114K | Buy |
3,900
+1,900
| +95% | +$53.2K | ﹤0.01% | 5505 |
|
|
2013
Q3 | $53K | Sell |
2,000
-900
| -31% | -$22.2K | ﹤0.01% | 5763 |
|
|
2013
Q2 | $61K | Buy |
+2,900
| New | +$61K | ﹤0.01% | 5557 |
|
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.