Rock Springs Capital Management’s Boston Scientific BSX Stock Holding History

Rock Springs Capital Management’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
2026 Q1	$32.3M	Buy	515,300 +116,250	+29%	+$9.3M	1.91%	16
2025 Q4	$38M	Buy	399,050 +38,800	+11%	+$3.8M	1.95%	16
2025 Q3	$35.2M	Buy	360,250 +5,250	+1%	+$544K	2.06%	15
2025 Q2	$38.1M	Buy	355,000 +78,000	+28%	+$7.89M	2.38%	11
2025 Q1	$27.9M	Sell	277,000 -183,000	-40%	-$18.4M	1.6%	23
2024 Q4	$41.1M	Hold	460,000	–	–	1.56%	21
2024 Q3	$38.5M	Sell	460,000 -357,500	-44%	-$28.2M	1.25%	30
2024 Q2	$63M	Sell	817,500 -415,000	-34%	-$30.4M	1.89%	11
2024 Q1	$84.4M	Hold	1,232,500	–	–	2.14%	11
2023 Q4	$71.3M	Buy	1,232,500 +72,500	+6%	+$3.87M	1.75%	19
2023 Q3	$61.2M	Buy	1,160,000 +892,500	+334%	+$46.8M	1.64%	20
2023 Q2	$14.5M	Buy	+267,500	New	+$14M	0.34%	67
2021 Q3	–	Sell	-800,000	Closed	-$34.2M	–	159
2021 Q2	$34.2M	Hold	800,000	–	–	0.68%	51
2021 Q1	$30.9M	Hold	800,000	–	–	0.67%	49
2020 Q4	$28.8M	Sell	800,000 -300,000	-27%	-$10.8M	0.61%	54
2020 Q3	$42M	Hold	1,100,000	–	–	1.07%	35
2020 Q2	$38.6M	Hold	1,100,000	–	–	1.06%	36
2020 Q1	$35.9M	Sell	1,100,000 -100,000	-8%	-$3.91M	1.48%	21
2019 Q4	$54.3M	Buy	1,200,000 +230,000	+24%	+$9.62M	1.71%	10
2019 Q3	$39.5M	Hold	970,000	–	–	1.57%	17
2019 Q2	$41.7M	Hold	970,000	–	–	1.51%	15
2019 Q1	$37.2M	Buy	970,000 +55,000	+6%	+$2.1M	1.44%	16
2018 Q4	$32.3M	Buy	915,000 +115,000	+14%	+$4.17M	1.53%	17
2018 Q3	$30.8M	Buy	800,000 +627,500	+364%	+$21.9M	1.12%	24
2018 Q2	$5.64M	Buy	+172,500	New	+$5.2M	0.22%	112

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

Rock Springs Capital Management's BSX Position: Q1 2026 in Review

Rock Springs Capital Management increased its Boston Scientific (BSX) stake by 29% in Q1 2026, buying an estimated $9.3M and bringing the position to 515,300 shares worth $32.3M. The position accounts for 1.91% of the portfolio, ranked #16.

Rock Springs Capital Management first reported a position in BSX in Q2 2018 and has held it in 25 quarters since. The position peaked at $84.4M in Q1 2024. 1,666 funds tracked by Wall St. Rank hold BSX as of Q1 2026.

Rock Springs Capital Management held 515,300 shares of Boston Scientific worth $32.3M as of Q1 2026.
Rock Springs Capital Management bought 116,250 Boston Scientific shares in Q1 2026, an estimated $9.3M.
Boston Scientific made up 1.91% of Rock Springs Capital Management's portfolio in Q1 2026, its #16 holding.
Rock Springs Capital Management first reported a position in Boston Scientific in Q2 2018 and has held it in 25 quarters since.
Rock Springs Capital Management's Boston Scientific position peaked at $84.4M in Q1 2024.
1,666 funds tracked by Wall St. Rank held Boston Scientific as of Q1 2026.

Based on Rock Springs Capital Management's 13F filing for Q1 2026, filed 15 May 2026.