Calamos Advisors
MASI

Calamos Advisors’s Masimo MASI Stock Holding History

Calamos Advisors’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 		$269K Buy
+1,511
New +$237K ﹤0.01% 1065
2025
Q3 		– Sell
-5,617
Closed -$945K – 970
2025
Q2 		$945K Sell
5,617
-17,832
-76% -$2.85M ﹤0.01% 699
2025
Q1 		$3.91M Buy
23,449
+7,169
+44% +$1.24M 0.02% 545
2024
Q4 		$2.69M Buy
+16,280
New +$2.57M 0.01% 577
2021
Q1 		– Sell
-3,759
Closed -$1.01M – 939
2020
Q4 		$1.01M Buy
3,759
+1,233
+49% +$307K 0.01% 685
2020
Q3 		$596K Sell
2,526
-978
-28% -$219K ﹤0.01% 677
2020
Q2 		$799K Buy
+3,504
New +$769K 0.01% 653

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

Calamos Advisors's MASI Position: Q1 2026 in Review

Calamos Advisors opened a new position in Masimo (MASI) in Q1 2026: 1,511 shares worth $269K. The stake represents ﹤0.01% of the portfolio and ranks #1065 among its holdings. This is a return to the name: Calamos Advisors previously reported a position in MASI as recently as Q2 2025.

Calamos Advisors first reported a position in MASI in Q2 2020 and has held it in 7 quarters since. The position peaked at $3.91M in Q1 2025. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Calamos Advisors held 1,511 shares of Masimo worth $269K as of Q1 2026.
  • Masimo was a new Calamos Advisors position in Q1 2026.
  • Masimo made up ﹤0.01% of Calamos Advisors's portfolio in Q1 2026, its #1065 holding.
  • Calamos Advisors first reported a position in Masimo in Q2 2020 and has held it in 7 quarters since.
  • Calamos Advisors's Masimo position peaked at $3.91M in Q1 2025.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Calamos Advisors's 13F filing for Q1 2026, filed 4 May 2026.