TRCT
MASI

Tower Research Capital (TRC)’s Masimo MASI Stock Holding History

Tower Research Capital (TRC)’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 		$341K Buy
1,919
+717
+60% +$113K 0.01% 1205
2025
Q4 		$156K Sell
1,202
-332
-22% -$47.5K ﹤0.01% 1623
2025
Q3 		$226K Buy
1,534
+18
+1% +$2.73K 0.01% 1369
2025
Q2 		$255K Buy
1,516
+166
+12% +$26.5K 0.01% 1565
2025
Q1 		$225K Sell
1,350
-1,238
-48% -$215K 0.01% 1305
2024
Q4 		$428K Buy
2,588
+1,515
+141% +$239K 0.01% 1175
2024
Q3 		$143K Sell
1,073
-13,695
-93% -$1.59M ﹤0.01% 1940
2024
Q2 		$1.86M Buy
14,768
+13,798
+1,422% +$1.82M 0.03% 461
2024
Q1 		$142K Sell
970
-2,737
-74% -$353K ﹤0.01% 1631
2023
Q4 		$434K Sell
3,707
-2,654
-42% -$247K 0.01% 1487
2023
Q3 		$558K Buy
6,361
+19
+0.3% +$2.21K 0.02% 811
2023
Q2 		$1.04M Buy
6,342
+4,162
+191% +$725K 0.03% 492
2023
Q1 		$402K Buy
2,180
+398
+22% +$67.1K 0.01% 968
2022
Q4 		$264K Buy
1,782
+15
+0.8% +$2.06K 0.01% 1111
2022
Q3 		$250K Sell
1,767
-9,221
-84% -$1.35M ﹤0.01% 1702
2022
Q2 		$1.44M Buy
10,988
+4,402
+67% +$589K 0.03% 491
2022
Q1 		$959K Buy
6,586
+2,587
+65% +$497K 0.01% 804
2021
Q4 		$1.17M Sell
3,999
-1,279
-24% -$364K 0.02% 622
2021
Q3 		$1.43M Sell
5,278
-5,589
-51% -$1.52M 0.04% 363
2021
Q2 		$2.63M Buy
10,867
+3,872
+55% +$883K 0.07% 228
2021
Q1 		$1.61M Sell
6,995
-8,646
-55% -$2.17M 0.03% 559
2020
Q4 		$4.2M Buy
15,641
+190
+1% +$47.4K 0.13% 96
2020
Q3 		$3.65M Sell
15,451
-12,749
-45% -$2.86M 0.04% 136
2020
Q2 		$6.43M Buy
+28,200
New +$6.19M 0.26% 41
2020
Q1 		– Sell
-921
Closed -$146K – 3538
2019
Q4 		$146K Buy
921
+199
+28% +$29.9K 0.01% 748
2019
Q3 		$108K Sell
722
-29
-4% -$4.41K 0.01% 1302
2019
Q2 		$112K Sell
751
-490
-39% -$67.2K 0.01% 1112
2019
Q1 		$172K Buy
1,241
+1,216
+4,864% +$153K 0.01% 1192
2018
Q4 		$3K Sell
25
-3,086
-99% -$344K ﹤0.01% 3198
2018
Q3 		$387K Sell
3,111
-572
-16% -$63.5K 0.03% 626
2018
Q2 		$360K Buy
3,683
+2,005
+119% +$191K 0.02% 792
2018
Q1 		$148K Buy
1,678
+1,493
+807% +$130K 0.01% 1034
2017
Q4 		$15K Sell
185
-3,619
-95% -$314K ﹤0.01% 2272
2017
Q3 		$329K Buy
+3,804
New +$336K 0.03% 439
2017
Q1 		– Sell
-1,011
Closed -$68K – 3553
2016
Q4 		$68K Buy
+1,011
New +$62.1K 0.01% 1205
2016
Q3 		– Sell
-2,204
Closed -$116K – 4090
2016
Q2 		$116K Buy
+2,204
New +$104K 0.01% 1011
2015
Q3 		– Sell
-537
Closed -$21K – 4456
2015
Q2 		$21K Sell
537
-1,570
-75% -$56.2K ﹤0.01% 2055
2015
Q1 		$69K Buy
2,107
+2,074
+6,285% +$59.6K 0.01% 1208
2014
Q4 		$1K Sell
33
-2,337
-99% -$57.7K ﹤0.01% 3673
2014
Q3 		$50K Buy
2,370
+2,319
+4,547% +$52.9K 0.01% 1530
2014
Q2 		$1K Sell
51
-110
-68% -$2.73K ﹤0.01% 3694
2014
Q1 		$4K Sell
161
-3,277
-95% -$93.5K ﹤0.01% 3442
2013
Q4 		$100K Sell
3,438
-2,413
-41% -$67.5K 0.02% 863
2013
Q3 		$156K Buy
+5,851
New +$144K 0.02% 937

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

Tower Research Capital (TRC)'s MASI Position: Q1 2026 in Review

Tower Research Capital (TRC) increased its Masimo (MASI) stake by 60% in Q1 2026, buying an estimated $113K and bringing the position to 1,919 shares worth $341K. The position accounts for 0.01% of the portfolio, ranked #1205.

Tower Research Capital (TRC) first reported a position in MASI in Q3 2013 and has held it in 44 quarters since. The position peaked at $6.43M in Q2 2020. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Tower Research Capital (TRC) held 1,919 shares of Masimo worth $341K as of Q1 2026.
  • Tower Research Capital (TRC) bought 717 Masimo shares in Q1 2026, an estimated $113K.
  • Masimo made up 0.01% of Tower Research Capital (TRC)'s portfolio in Q1 2026, its #1205 holding.
  • Tower Research Capital (TRC) first reported a position in Masimo in Q3 2013 and has held it in 44 quarters since.
  • Tower Research Capital (TRC)'s Masimo position peaked at $6.43M in Q2 2020.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Tower Research Capital (TRC)'s 13F filing for Q1 2026, filed 15 May 2026.