Question 1

How many shares of RMBS does PRIMECAP MANAGEMENT CO/CA/ own?

Accepted Answer

As of 2026-Q2, PRIMECAP MANAGEMENT CO/CA/ holds 47,500 shares of RMBS (RAMBUS INC).

Question 2

What is PRIMECAP MANAGEMENT CO/CA/'s RMBS position worth?

Accepted Answer

As of 2026-Q2, PRIMECAP MANAGEMENT CO/CA/'s RMBS position is worth $6.3M.

Question 3

When did PRIMECAP MANAGEMENT CO/CA/ first buy RMBS?

Accepted Answer

Based on available 13F filings, PRIMECAP MANAGEMENT CO/CA/ first reported a position in RMBS in 2024-Q3. They have held the position across 31 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price
2026-Q2 Latest	Unchanged	47,500	0.0%	$6.3M	0.0%	$132.74
2026-Q1	Unchanged	47,500	0.0%	$4.1M	0.0%	$87.59
2025-Q4	Decreased	47,500	-19.5%	$4.4M	0.0%	$94.69
2025-Q3	Decreased	59,000	-5.3%	$6.1M	0.0%	$103.99
2025-Q2	Decreased	62,300	-14.5%	$4M	0.0%	$64.00
2025-Q1	Decreased	72,900	-11.6%	$3.8M	0.0%	$53.70
2024-Q4	Decreased	82,500	-12.7%	$4.4M	0.0%	$53.60
2024-Q3	Decreased	94,500	-8.8%	$4M	0.0%	$42.12