SEC 13F Intelligence

Primecap Management Co/Ca/ / BSX

Primecap Management Co/Ca/’s Boston Scientific Corp Position

Does Primecap Management Co/Ca/ own Boston Scientific Corp (BSX)? Yes — 32.53M shares worth $2.0B (+1.61% of its 13F portfolio) as of Q1 2026, up from 31.10M shares the prior filed quarter.

Position Value
$2.0B
Q1 2026
Shares
32.53M
% of Portfolio
+1.61%
Quarters Held
30
currently held

Position History BSX

Reported value by quarter
Q4 ’18: $1.6BQ4 ’18Q1 ’19: $1.7BQ2 ’19: $1.9BQ3 ’19: $1.8BQ4 ’19: $2.0BQ4 ’19Q1 ’20: $1.4BQ2 ’20: $1.5BQ3 ’20: $1.5BQ4 ’20: $1.4BQ4 ’20Q1 ’21: $1.6BQ2 ’21: $1.7BQ3 ’21: $1.7BQ4 ’21: $1.6BQ4 ’21Q1 ’22: $1.7BQ2 ’22: $1.4BQ3 ’22: $1.5BQ4 ’22: $1.7BQ4 ’22Q1 ’23: $1.9BQ2 ’23: $2.0BQ3 ’23: $2.0BQ4 ’23: $2.2BQ4 ’23Q1 ’24: $2.6BQ2 ’24: $2.9BQ3 ’24: $3.2BQ4 ’24: $3.3BQ4 ’24Q1 ’25: $3.7BQ2 ’25: $3.7BQ3 ’25: $3.2BQ4 ’25: $3.0BQ4 ’25Q1 ’26: $2.0Bfilingsflow.com
QuarterSharesValue% of Portfolio
Q1 202632.53M$2.0B+1.61%
Q4 202531.10M$3.0B+2.24%
Q3 202533.10M$3.2B+2.48%
Q2 202534.66M$3.7B+2.95%
Q1 202536.50M$3.7B+3.04%
Q4 202436.93M$3.3B+2.55%
Q3 202437.83M$3.2B+2.33%
Q2 202437.96M$2.9B+2.12%
Q1 202437.95M$2.6B+1.94%
Q4 202337.91M$2.2B+1.73%
Q3 202337.36M$2.0B+1.66%
Q2 202337.43M$2.0B+1.69%
Q1 202338.33M$1.9B+1.67%
Q4 202237.65M$1.7B+1.59%
Q3 202237.65M$1.5B+1.41%
Q2 202237.82M$1.4B+1.26%
Q1 202237.92M$1.7B+1.27%
Q4 202138.12M$1.6B+1.12%
Q3 202139.61M$1.7B+1.21%
Q2 202140.02M$1.7B+1.15%
Q1 202141.01M$1.6B+1.11%
Q4 202039.46M$1.4B+1.05%
Q3 202040.48M$1.5B+1.28%
Q2 202041.68M$1.5B+1.26%
Q1 202042.31M$1.4B+1.35%
Q4 201944.58M$2.0B+1.46%
Q3 201944.66M$1.8B+1.45%
Q2 201945.14M$1.9B+1.43%
Q1 201945.05M$1.7B+1.27%
Q4 201845.06M$1.6B+1.29%

Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See Primecap Management Co/Ca/’s full portfolio or all institutional holders of BSX.