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 | $50M | Buy |
281,366
+238,314
| +554% | +$37.4M | 0.01% | 1359 |
|
|
2025
Q4 | $5.6M | Sell |
43,052
-44,698
| -51% | -$6.4M | ﹤0.01% | 4123 |
|
|
2025
Q3 | $12.9M | Buy |
87,750
+63,473
| +261% | +$9.61M | ﹤0.01% | 2891 |
|
|
2025
Q2 | $4.08M | Sell |
24,277
-25,205
| -51% | -$4.03M | ﹤0.01% | 4456 |
|
|
2025
Q1 | $8.24M | Sell |
49,482
-391,543
| -89% | -$67.9M | ﹤0.01% | 3119 |
|
|
2024
Q4 | $72.9M | Buy |
441,025
+251,476
| +133% | +$39.7M | 0.01% | 963 |
|
|
2024
Q3 | $25.3M | Sell |
189,549
-37,941
| -17% | -$4.4M | ﹤0.01% | 1816 |
|
|
2024
Q2 | $28.7M | Sell |
227,490
-1,117,726
| -83% | -$147M | 0.01% | 1647 |
|
|
2024
Q1 | $198M | Buy |
1,345,216
+581,137
| +76% | +$75M | 0.04% | 379 |
|
|
2023
Q4 | $89.6M | Buy |
764,079
+507,387
| +198% | +$47.3M | 0.02% | 762 |
|
|
2023
Q3 | $22.5M | Buy |
256,692
+217,158
| +549% | +$25.3M | ﹤0.01% | 1737 |
|
|
2023
Q2 | $6.51M | Sell |
39,534
-116,787
| -75% | -$20.3M | ﹤0.01% | 3259 |
|
|
2023
Q1 | $28.8M | Buy |
156,321
+123,109
| +371% | +$20.8M | 0.01% | 1567 |
|
|
2022
Q4 | $4.91M | Sell |
33,212
-155,505
| -82% | -$21.4M | ﹤0.01% | 3898 |
|
|
2022
Q3 | $26.6M | Buy |
188,717
+63,752
| +51% | +$9.31M | 0.01% | 1600 |
|
|
2022
Q2 | $16.3M | Sell |
124,965
-21,490
| -15% | -$2.88M | ﹤0.01% | 2066 |
|
|
2022
Q1 | $21.3M | Buy |
146,455
+89,531
| +157% | +$17.2M | ﹤0.01% | 1915 |
|
|
2021
Q4 | $16.7M | Buy |
56,924
+38,669
| +212% | +$11M | ﹤0.01% | 2258 |
|
|
2021
Q3 | $4.94M | Buy |
18,255
+5,437
| +42% | +$1.47M | ﹤0.01% | 4323 |
|
|
2021
Q2 | $3.11M | Sell |
12,818
-23,851
| -65% | -$5.44M | ﹤0.01% | 5515 |
|
|
2021
Q1 | $8.42M | Buy |
36,669
+28,729
| +362% | +$7.22M | ﹤0.01% | 3244 |
|
|
2020
Q4 | $2.13M | Buy |
+7,940
| New | +$1.98M | ﹤0.01% | 5231 |
|
|
2020
Q3 | – | Sell |
-21,080
| Closed | -$4.73M | – | 10462 |
|
|
2020
Q2 | $4.81M | Sell |
21,080
-29,319
| -58% | -$6.43M | ﹤0.01% | 3143 |
|
|
2020
Q1 | $8.93M | Buy |
50,399
+47,472
| +1,622% | +$8.14M | ﹤0.01% | 1987 |
|
|
2019
Q4 | $463K | Sell |
2,927
-12,354
| -81% | -$1.86M | ﹤0.01% | 6938 |
|
|
2019
Q3 | $2.27M | Sell |
15,281
-25,624
| -63% | -$3.89M | ﹤0.01% | 4272 |
|
|
2019
Q2 | $6.09M | Sell |
40,905
-455,172
| -92% | -$62.5M | ﹤0.01% | 2812 |
|
|
2019
Q1 | $68.6M | Sell |
496,077
-8,379
| -2% | -$1.05M | 0.03% | 540 |
|
|
2018
Q4 | $54.2M | Sell |
504,456
-16,031
| -3% | -$1.79M | 0.03% | 575 |
|
|
2018
Q3 | $64.8M | Sell |
520,487
-252,536
| -33% | -$28M | 0.03% | 608 |
|
|
2018
Q2 | $75.5M | Sell |
773,023
-217,306
| -22% | -$20.7M | 0.04% | 488 |
|
|
2018
Q1 | $87.1M | Buy |
990,329
+941,964
| +1,948% | +$82.1M | 0.05% | 373 |
|
|
2017
Q4 | $4.1M | Buy |
+48,365
| New | +$4.2M | ﹤0.01% | 2716 |
|
|
2017
Q3 | – | Sell |
-7,843
| Closed | -$694K | – | 7813 |
|
|
2017
Q2 | $715K | Sell |
7,843
-30,889
| -80% | -$2.84M | ﹤0.01% | 4604 |
|
|
2017
Q1 | $3.61M | Buy |
38,732
+35,525
| +1,108% | +$2.92M | ﹤0.01% | 2385 |
|
|
2016
Q4 | $216K | Sell |
3,207
-7,403
| -70% | -$455K | ﹤0.01% | 6198 |
|
|
2016
Q3 | $631K | Sell |
10,610
-27,428
| -72% | -$1.55M | ﹤0.01% | 4495 |
|
|
2016
Q2 | $2M | Sell |
38,038
-19,890
| -34% | -$937K | ﹤0.01% | 2749 |
|
|
2016
Q1 | $2.42M | Buy |
57,928
+57,256
| +8,520% | +$2.15M | ﹤0.01% | 2451 |
|
|
2015
Q4 | $28K | Sell |
672
-6,228
| -90% | -$254K | ﹤0.01% | 7704 |
|
|
2015
Q3 | $266K | Sell |
6,900
-11,959
| -63% | -$489K | ﹤0.01% | 5740 |
|
|
2015
Q2 | $730K | Sell |
18,859
-40,682
| -68% | -$1.46M | ﹤0.01% | 4409 |
|
|
2015
Q1 | $1.96M | Sell |
59,541
-189,039
| -76% | -$5.43M | ﹤0.01% | 3089 |
|
|
2014
Q4 | $6.55M | Sell |
248,580
-23,872
| -9% | -$589K | 0.01% | 1736 |
|
|
2014
Q3 | $5.8M | Buy |
272,452
+115,800
| +74% | +$2.64M | 0.01% | 1858 |
|
|
2014
Q2 | $3.7M | Buy |
156,652
+148,576
| +1,840% | +$3.69M | ﹤0.01% | 2111 |
|
|
2014
Q1 | $220K | Sell |
8,076
-46,463
| -85% | -$1.33M | ﹤0.01% | 5414 |
|
|
2013
Q4 | $1.59M | Sell |
54,539
-31,002
| -36% | -$868K | ﹤0.01% | 2765 |
|
|
2013
Q3 | $2.28M | Sell |
85,541
-123,111
| -59% | -$3.04M | ﹤0.01% | 2287 |
|
|
2013
Q2 | $4.42M | Buy |
+208,652
| New | +$4.39M | 0.01% | 1687 |
|
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.