Calamos Advisors’s Boston Scientific BSX Stock Holding History

Calamos Advisors’s Portfolio BSX Stock Details BSX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q3	–	Sell	-138,500	Closed	-$14M	–	935
2025 Q2	$14M	Hold	138,500	–	–	0.06%	339
2025 Q1	$12.4M	Sell	138,500 -25,500	-16%	-$2.57M	0.05%	345
2024 Q4	$13.7M	Buy	164,000 +35,700	+28%	+$3.14M	0.06%	335
2024 Q3	$9.88M	Sell	128,300 -30,700	-19%	-$2.42M	0.04%	411
2024 Q2	$10.9M	Buy	159,000 +20,300	+15%	+$1.49M	0.05%	377
2024 Q1	$8.02M	Buy	+138,700	New	+$8.92M	0.04%	444

Other funds holding BSX

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return

Calamos Advisors's BSX Position: Q1 2026 in Review

Calamos Advisors reduced its Boston Scientific (BSX) stake by 6.2% in Q1 2026, selling an estimated $4.32M and leaving 817,686 shares worth $51.3M. The position accounts for 0.18% of the portfolio, ranked #126.

Calamos Advisors first reported a position in BSX in Q3 2019 and has held it in 27 quarters since. The position peaked at $107M in Q2 2025. 1,664 funds tracked by Wall St. Rank hold BSX as of Q1 2026.

Calamos Advisors held 817,686 shares of Boston Scientific worth $51.3M as of Q1 2026.
Calamos Advisors sold 53,971 Boston Scientific shares in Q1 2026, an estimated $4.32M.
Boston Scientific made up 0.18% of Calamos Advisors's portfolio in Q1 2026, its #126 holding.
Calamos Advisors first reported a position in Boston Scientific in Q3 2019 and has held it in 27 quarters since.
Calamos Advisors's Boston Scientific position peaked at $107M in Q2 2025.
1,664 funds tracked by Wall St. Rank held Boston Scientific as of Q1 2026.

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