GCP
MASI

GSA Capital Partners’s Masimo MASI Stock Holding History

GSA Capital Partners’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 		– Sell
-3,682
Closed -$479K – 1985
2025
Q4 		$479K Buy
+3,682
New +$527K 0.04% 836
2024
Q4 		– Sell
-8,230
Closed -$1.1M – 1849
2024
Q3 		$1.1M Sell
8,230
-3,978
-33% -$462K 0.08% 419
2024
Q2 		$1.54M Buy
+12,208
New +$1.61M 0.11% 264
2023
Q2 		– Sell
-7,907
Closed -$1.46M – 1764
2023
Q1 		$1.46M Buy
+7,907
New +$1.33M 0.14% 156
2022
Q2 		– Sell
-1,486
Closed -$216K – 1634
2022
Q1 		$216K Buy
1,486
+529
+55% +$102K 0.03% 1136
2021
Q4 		$280K Buy
+957
New +$273K 0.04% 981
2021
Q2 		– Sell
-2,112
Closed -$485K – 1490
2021
Q1 		$485K Buy
2,112
+1,053
+99% +$265K 0.08% 369
2020
Q4 		$284K Buy
+1,059
New +$264K 0.05% 768
2020
Q2 		– Sell
-1,573
Closed -$279K – 903
2020
Q1 		$279K Buy
+1,573
New +$270K 0.07% 533
2019
Q4 		– Sell
-3,459
Closed -$515K – 1606
2019
Q3 		$515K Sell
3,459
-6,279
-64% -$954K 0.07% 535
2019
Q2 		$1.45M Buy
9,738
+3,983
+69% +$547K 0.16% 102
2019
Q1 		$796K Sell
5,755
-3,997
-41% -$502K 0.08% 412
2018
Q4 		$1.05M Sell
9,752
-3,395
-26% -$379K 0.12% 199
2018
Q3 		$1.64M Sell
13,147
-25,198
-66% -$2.8M 0.09% 358
2018
Q2 		$3.74M Buy
38,345
+19,892
+108% +$1.89M 0.19% 66
2018
Q1 		$1.62M Buy
18,453
+2,854
+18% +$249K 0.09% 403
2017
Q4 		$1.32M Buy
15,599
+130
+0.8% +$11.3K 0.08% 431
2017
Q3 		$1.34M Sell
15,469
-9,287
-38% -$821K 0.09% 339
2017
Q2 		$2.26M Sell
24,756
-11,860
-32% -$1.09M 0.15% 122
2017
Q1 		$3.42M Buy
36,616
+7,181
+24% +$591K 0.18% 72
2016
Q4 		$1.98M Buy
29,435
+441
+2% +$27.1K 0.12% 210
2016
Q3 		$1.73M Sell
28,994
-17,080
-37% -$964K 0.09% 291
2016
Q2 		$2.42M Buy
46,074
+26,574
+136% +$1.25M 0.13% 166
2016
Q1 		$816K Sell
19,500
-9,651
-33% -$363K 0.05% 675
2015
Q4 		$1.21M Buy
29,151
+17,944
+160% +$733K 0.06% 561
2015
Q3 		$432K Sell
11,207
-10,593
-49% -$433K 0.02% 1202
2015
Q2 		$845K Sell
21,800
-400
-2% -$14.3K 0.03% 1027
2015
Q1 		$732K Sell
22,200
-18,644
-46% -$536K 0.03% 1127
2014
Q4 		$1.08M Buy
40,844
+2,580
+7% +$63.7K 0.08% 424
2014
Q3 		$814K Buy
38,264
+1,495
+4% +$34.1K 0.04% 622
2014
Q2 		$868K Buy
36,769
+18,805
+105% +$466K 0.04% 760
2014
Q1 		$491K Sell
17,964
-19,636
-52% -$560K 0.03% 792
2013
Q4 		$1.1M Buy
37,600
+5,700
+18% +$160K 0.09% 306
2013
Q3 		$850K Buy
31,900
+6,100
+24% +$150K 0.07% 444
2013
Q2 		$547K Buy
+25,800
New +$543K 0.06% 492

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

GSA Capital Partners's MASI Position: Q1 2026 in Review

GSA Capital Partners sold out of Masimo (MASI) in Q1 2026, closing a stake of 3,682 shares — an estimated $479K sold.

GSA Capital Partners first reported a position in MASI in Q2 2013 and held it in 35 quarters. The position peaked at $3.74M in Q2 2018. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • GSA Capital Partners reported no remaining Masimo position as of Q1 2026 after selling out during the quarter.
  • GSA Capital Partners sold 3,682 Masimo shares in Q1 2026, an estimated $479K.
  • GSA Capital Partners first reported a position in Masimo in Q2 2013 and held it in 35 quarters.
  • GSA Capital Partners's Masimo position peaked at $3.74M in Q2 2018.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on GSA Capital Partners's 13F filing for Q1 2026, filed 8 May 2026.