Russell Investments Group
MASI

Russell Investments Group’s Masimo MASI Stock Holding History

Russell Investments 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 		$776K Sell
4,363
-270
-6% -$42.4K ﹤0.01% 2332
2025
Q4 		$603K Sell
4,633
-256
-5% -$36.7K ﹤0.01% 2422
2025
Q3 		$721K Sell
4,889
-6,046
-55% -$915K ﹤0.01% 2320
2025
Q2 		$1.84M Sell
10,935
-23,812
-69% -$3.8M ﹤0.01% 1762
2025
Q1 		$5.79M Buy
34,747
+15,044
+76% +$2.61M 0.01% 1081
2024
Q4 		$3.26M Buy
19,703
+19,185
+3,704% +$3.03M ﹤0.01% 1405
2024
Q3 		$69.1K Sell
518
-77
-13% -$8.94K ﹤0.01% 2724
2024
Q2 		$75K Sell
595
-55
-8% -$7.24K ﹤0.01% 2684
2024
Q1 		$95.5K Sell
650
-740
-53% -$95.5K ﹤0.01% 2578
2023
Q4 		$163K Sell
1,390
-1,684
-55% -$157K ﹤0.01% 2474
2023
Q3 		$270K Sell
3,074
-5,043
-62% -$587K ﹤0.01% 2423
2023
Q2 		$1.34M Buy
8,117
+8
+0.1% +$1.39K ﹤0.01% 1779
2023
Q1 		$1.5M Sell
8,109
-1,299
-14% -$219K ﹤0.01% 1752
2022
Q4 		$1.39M Sell
9,408
-3,240
-26% -$446K ﹤0.01% 1799
2022
Q3 		$1.79M Sell
12,648
-53,889
-81% -$7.87M ﹤0.01% 1611
2022
Q2 		$8.87M Buy
66,537
+39,838
+149% +$5.33M 0.02% 831
2022
Q1 		$4.02M Buy
26,699
+7,097
+36% +$1.36M 0.01% 1284
2021
Q4 		$5.74M Buy
19,602
+959
+5% +$273K 0.01% 1167
2021
Q3 		$5.04M Sell
18,643
-6,617
-26% -$1.79M 0.01% 1245
2021
Q2 		$6.12M Sell
25,260
-5,392
-18% -$1.23M 0.01% 1217
2021
Q1 		$7.04M Buy
30,652
+1,555
+5% +$391K 0.01% 1164
2020
Q4 		$7.8M Sell
29,097
-1,646
-5% -$410K 0.02% 999
2020
Q3 		$7.25M Sell
30,743
-7,779
-20% -$1.74M 0.02% 931
2020
Q2 		$8.73M Buy
38,522
+13,042
+51% +$2.86M 0.02% 799
2020
Q1 		$4.52M Sell
25,480
-6,098
-19% -$1.05M 0.01% 1017
2019
Q4 		$4.99M Sell
31,578
-35,825
-53% -$5.39M 0.01% 1212
2019
Q3 		$10M Sell
67,403
-13,011
-16% -$1.98M 0.02% 854
2019
Q2 		$11.9M Buy
80,414
+2,221
+3% +$305K 0.02% 792
2019
Q1 		$10.8M Buy
78,193
+58,696
+301% +$7.37M 0.02% 861
2018
Q4 		$2.08M Sell
19,497
-12,419
-39% -$1.38M ﹤0.01% 1588
2018
Q3 		$3.97M Buy
31,916
+1,560
+5% +$173K 0.01% 1419
2018
Q2 		$2.96M Sell
30,356
-33,953
-53% -$3.23M 0.01% 1545
2018
Q1 		$5.63M Sell
64,309
-251,302
-80% -$21.9M 0.01% 1296
2017
Q4 		$27M Sell
315,611
-146,249
-32% -$12.7M 0.05% 491
2017
Q3 		$40M Sell
461,860
-90,700
-16% -$8.02M 0.07% 353
2017
Q2 		$50.4M Buy
552,560
+214,183
+63% +$19.7M 0.09% 283
2017
Q1 		$31.6M Buy
338,377
+178,336
+111% +$14.7M 0.06% 403
2016
Q4 		$10.8M Buy
+160,041
New +$9.84M 0.02% 813

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

Russell Investments Group's MASI Position: Q1 2026 in Review

Russell Investments Group reduced its Masimo (MASI) stake by 5.8% in Q1 2026, selling an estimated $42.4K and leaving 4,363 shares worth $776K. The position accounts for ﹤0.01% of the portfolio, ranked #2332.

Russell Investments Group first reported a position in MASI in Q4 2016 and has held it in 38 quarters since. The position peaked at $50.4M in Q2 2017. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Russell Investments Group held 4,363 shares of Masimo worth $776K as of Q1 2026.
  • Russell Investments Group sold 270 Masimo shares in Q1 2026, an estimated $42.4K.
  • Masimo made up ﹤0.01% of Russell Investments Group's portfolio in Q1 2026, its #2332 holding.
  • Russell Investments Group first reported a position in Masimo in Q4 2016 and has held it in 38 quarters since.
  • Russell Investments Group's Masimo position peaked at $50.4M in Q2 2017.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Russell Investments Group's 13F filing for Q1 2026, filed 8 May 2026.