Janus Henderson Group
MASI

Janus Henderson Group’s Masimo MASI Stock Holding History

Janus Henderson Group’s Portfolio MASI Stock Details MASI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$3.56M Hold
20,000
– – ﹤0.01% 1077
2025
Q4 		$2.6M Hold
20,000
– – ﹤0.01% 1205
2025
Q3 		$2.95M Hold
20,000
– – ﹤0.01% 1143
2025
Q2 		$3.36M Hold
20,000
– – ﹤0.01% 1058
2025
Q1 		$3.27M Sell
20,000
-1,000
-5% -$174K ﹤0.01% 1042
2024
Q4 		$3.47M Sell
21,000
-800
-4% -$126K ﹤0.01% 1048
2024
Q3 		$2.91M Hold
21,800
– – ﹤0.01% 1125
2024
Q2 		$2.75M Sell
21,800
-230
-1% -$30.3K ﹤0.01% 1109
2024
Q1 		$3.23M Sell
22,030
-1,224
-5% -$158K ﹤0.01% 1060
2023
Q4 		$2.73M Sell
23,254
-1,639
-7% -$153K ﹤0.01% 1084
2023
Q3 		$2.18M Buy
24,893
+20,188
+429% +$2.35M ﹤0.01% 1138
2023
Q2 		$774K Sell
4,705
-610
-11% -$106K ﹤0.01% 1735
2023
Q1 		$981K Sell
5,315
-13
-0.2% -$2.19K ﹤0.01% 1641
2022
Q4 		$788K Buy
5,328
+1
+0% +$138 ﹤0.01% 1492
2022
Q3 		$752K Sell
5,327
-1,102
-17% -$161K ﹤0.01% 1770
2022
Q2 		$840K Sell
6,429
-1,249
-16% -$167K ﹤0.01% 1437
2022
Q1 		$1.12M Sell
7,678
-2,444
-24% -$469K ﹤0.01% 1448
2021
Q4 		$2.96M Sell
10,122
-1,028
-9% -$293K ﹤0.01% 1180
2021
Q3 		$3.02M Sell
11,150
-20,840
-65% -$5.65M ﹤0.01% 1163
2021
Q2 		$7.75M Sell
31,990
-43,184
-57% -$9.85M ﹤0.01% 975
2021
Q1 		$17.3M Buy
75,174
+50,004
+199% +$12.6M 0.01% 798
2020
Q4 		$6.75M Sell
25,170
-22,100
-47% -$5.51M ﹤0.01% 919
2020
Q3 		$11.2M Buy
47,270
+12,068
+34% +$2.71M 0.01% 814
2020
Q2 		$8.03M Buy
35,202
+15,783
+81% +$3.46M ﹤0.01% 852
2020
Q1 		$3.44M Sell
19,419
-629,466
-97% -$108M ﹤0.01% 934
2019
Q4 		$103M Sell
648,885
-56,928
-8% -$8.56M 0.05% 363
2019
Q3 		$105M Buy
705,813
+13,860
+2% +$2.11M 0.06% 350
2019
Q2 		$103M Buy
691,953
+101,354
+17% +$13.9M 0.06% 363
2019
Q1 		$81.7M Buy
590,599
+61,762
+12% +$7.75M 0.05% 447
2018
Q4 		$56.8M Buy
528,837
+72,343
+16% +$8.07M 0.04% 503
2018
Q3 		$56.9M Sell
456,494
-2,593
-0.6% -$288K 0.03% 553
2018
Q2 		$44.8M Buy
459,087
+22,518
+5% +$2.14M 0.03% 582
2018
Q1 		$38.4M Sell
436,569
-6,596
-1% -$575K 0.02% 621
2017
Q4 		$37.6M Buy
443,165
+83,711
+23% +$7.26M 0.02% 611
2017
Q3 		$31.1M Sell
359,454
-108,599
-23% -$9.6M 0.02% 632
2017
Q2 		$42.7M Sell
468,053
-22,558
-5% -$2.07M 0.03% 557
2017
Q1 		$45.8M Sell
490,611
-112,523
-19% -$9.26M 0.32% 73
2016
Q4 		$40.7M Sell
603,134
-117,121
-16% -$7.2M 0.3% 84
2016
Q3 		$42.8M Sell
720,255
-4,811
-0.7% -$271K 0.32% 85
2016
Q2 		$38.1M Buy
725,066
+265,011
+58% +$12.5M 0.32% 85
2016
Q1 		$19.2M Sell
460,055
-13,314
-3% -$501K 0.16% 169
2015
Q4 		$19.6M Buy
473,369
+7,514
+2% +$307K 0.16% 160
2015
Q3 		$18M Buy
465,855
+86,885
+23% +$3.55M 0.16% 167
2015
Q2 		$14.7M Sell
378,970
-5,102
-1% -$183K 0.12% 213
2015
Q1 		$16.8M Buy
384,072
+81,098
+27% +$2.33M 0.13% 205
2014
Q4 		$7.98M Buy
+302,974
New +$7.48M 0.06% 313

Other funds holding MASI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
PCM
Politan Capital Management New York $985M AUM 3.12% 1-Year Est. Return
PCM
Pentwater Capital Management Naples, Florida $19.3B AUM 58.13% 1-Year Est. Return
Barclays
Barclays London, United Kingdom $416B AUM 33.63% 1-Year Est. Return
HI
HBK Investments Dallas, Texas $9.85B AUM 55.6% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Janus Henderson Group's MASI Position: Q1 2026 in Review

Janus Henderson Group held its Masimo (MASI) position steady in Q1 2026 at 20,000 shares worth $3.56M. The position accounts for ﹤0.01% of the portfolio, ranked #1077.

Janus Henderson Group first reported a position in MASI in Q4 2014 and has held it in 46 quarters since. The position peaked at $105M in Q3 2019. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Janus Henderson Group held 20,000 shares of Masimo worth $3.56M as of Q1 2026.
  • Janus Henderson Group left its Masimo share count unchanged in Q1 2026.
  • Masimo made up ﹤0.01% of Janus Henderson Group's portfolio in Q1 2026, its #1077 holding.
  • Janus Henderson Group first reported a position in Masimo in Q4 2014 and has held it in 46 quarters since.
  • Janus Henderson Group's Masimo position peaked at $105M in Q3 2019.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.