Question 1

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

Accepted Answer

As of 2026-Q2, PRIMECAP MANAGEMENT CO/CA/ holds 20.5M shares of KLAC (KLA CORP).

Question 2

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

Accepted Answer

As of 2026-Q2, PRIMECAP MANAGEMENT CO/CA/'s KLAC position is worth $6.2B.

Question 3

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

Accepted Answer

In 2026-Q2, PRIMECAP MANAGEMENT CO/CA/ increased their KLAC position (+742.5% change in shares).

Question 4

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

Accepted Answer

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

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Increased	20.5M	+742.5%	$6.2B	3.7%	$301.71	94
2026-Q1	Decreased	2.4M	-15.2%	$3.6B	2.8%	$1,441.35	0
2025-Q4	Decreased	2.9M	-18.6%	$3.5B	2.6%	$1,243.65	0
2025-Q3	Decreased	3.5M	-21.1%	$3.8B	2.9%	$1,062.35	0
2025-Q2	Decreased	4.5M	-8.1%	$4B	3.2%	$886.45	0
2025-Q1	Decreased	4.9M	-5.9%	$3.3B	2.7%	$669.40	0
2024-Q4	Decreased	5.2M	-2.2%	$3.3B	2.5%	$628.27	0
2024-Q3	Decreased	5.3M	-3.9%	$4.1B	3.0%	$773.62	0