Question 1

Does PRIMECAP Management own MU stock?

Accepted Answer

Yes. As of its Q2 2026 13F, PRIMECAP Management holds 19,217,236 shares of MU (Micron Technology), worth $22.2B.

Question 2

How many shares of MU does PRIMECAP Management own?

Accepted Answer

As of its Q2 2026 13F, PRIMECAP Management holds 19,217,236 shares of MU (Micron Technology).

Question 3

What is PRIMECAP Management's MU position worth?

Accepted Answer

As of its Q2 2026 13F, PRIMECAP Management's MU position is worth $22.2B.

Question 4

Is PRIMECAP Management buying or selling MU?

Accepted Answer

In Q2 2026, PRIMECAP Management reduced its MU position by 2,656,968 shares (-12.2%).

Question 5

When did PRIMECAP Management first buy MU?

Accepted Answer

PRIMECAP Management already held MU in its Q4 2018 13F, the earliest on record, and has listed it in 31 quarterly 13F filings.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Decreased	19.2M	-12.2%	$22.2B	13.1%	$1,153.93	0
2026-Q1	Decreased	21.9M	-11.8%	$7.4B	5.8%	$337.73	0
2025-Q4	Decreased	24.8M	-16.4%	$7.1B	5.4%	$285.20	0
2025-Q3	Decreased	29.7M	-5.8%	$5B	3.8%	$167.03	0
2025-Q2	Decreased	31.5M	-15.6%	$3.9B	3.1%	$122.92	0
2025-Q1	Decreased	37.3M	-0.8%	$3.2B	2.7%	$86.66	0
2024-Q4	Decreased	37.6M	-0.1%	$3.2B	2.5%	$83.82	0
2024-Q3	Increased	37.6M	+0.6%	$3.9B	2.9%	$103.06	55