Question 1

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

Accepted Answer

As of 2026-Q1, PRIMECAP MANAGEMENT CO/CA/ holds 21.9M shares of MU (MICRON TECHNOLOGY INC).

Question 2

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

Accepted Answer

As of 2026-Q1, PRIMECAP MANAGEMENT CO/CA/'s MU position is worth $7.4B.

Question 3

Is PRIMECAP MANAGEMENT CO/CA/ buying or selling MU?

Accepted Answer

In 2026-Q1, PRIMECAP MANAGEMENT CO/CA/ decreased their MU position (-11.8% change in shares).

Question 4

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

Accepted Answer

Based on available 13F filings, PRIMECAP MANAGEMENT CO/CA/ first reported a position in MU in 2024-Q2. They have held the position across 30 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q1 Latest	Decreased	21.9M	-11.8%	$7.4B	5.8%	$379.68	0
2025-Q4	Decreased	24.8M	-16.4%	$7.1B	5.4%	$292.63	0
2025-Q3	Decreased	29.7M	-5.8%	$5B	3.8%	$163.73	0
2025-Q2	Decreased	31.5M	-15.6%	$3.9B	3.1%	$124.51	0
2025-Q1	Decreased	37.3M	-0.8%	$3.2B	2.7%	$88.15	0
2024-Q4	Decreased	37.6M	-0.1%	$3.2B	2.5%	$85.03	0
2024-Q3	Increased	37.6M	+0.6%	$3.9B	2.9%	$106.89	55
2024-Q2	Decreased	37.4M	-0.5%	$4.9B	3.6%	$130.67	0