Institutional Manager · CIK 0000763212

PRIMECAP MANAGEMENT CO/CA/

PASADENA, CA · File #028-01469

Latest AUM

$132.11B

Positions

319

Top-10 Concentration

43.9%

Filings

Portfolio Value Over Time

2024-03

2024-06

2024-09

2024-12

2025-03

2025-06

2025-09

2025-12

Biggest QoQ Changes

Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.

Action	Issuer	Ticker / CUSIP	Δ Shares	Flow ($)	Price Effect
REDUCE	ELI LILLY & CO	LLY	-1,529,556	-$1.64B	+$3.36B
REDUCE	MICRON TECHNOLOGY INC	MU	-4,860,499	-$1.39B	+$3.50B
REDUCE	KLA CORP	KLAC	-659,220	-$801.0M	+$482.5M
REDUCE	CHEVRON CORP NEW	CVX	-4,037,474	-$615.4M	-$18.3M
REDUCE	WELLS FARGO CO NEW	949746101	-6,566,583	-$612.0M	+$140.0M
REDUCE	MICROSOFT CORP	MSFT	-1,101,785	-$532.8M	-$288.0M
ADD	NETFLIX INC	NFLX	+3,826,870	+$358.8M	-$216.9M
ADD	AMAZON COM INC	AMZN	+1,542,950	+$356.1M	+$120.5M
REDUCE	TERADYNE INC	TER	-1,834,698	-$355.1M	+$142.7M
ADD	SYNOPSYS INC	SNPS	+647,700	+$304.2M	-$2.1M

Sector Allocation

Technology

25.6%$33.85B

Healthcare

22.1%$29.14B

Industrials

7.2%$9.57B

Consumer Discretionary

7.0%$9.19B

Financials

2.5%$3.36B

Energy

1.5%$1.95B

Consumer Staples

1.1%$1.42B

Communication Services

1.0%$1.37B

Materials

0.6%$792.1M

Real Estate

0.1%$81.5M

Filing History

Feb 11, 202613F HOLDINGS REPORTQ/E Dec 2025319 pos · $132.11B
Nov 12, 202513F HOLDINGS REPORTQ/E Sep 2025327 pos · $130.57B
Aug 11, 202513F HOLDINGS REPORTQ/E Jun 2025333 pos · $126.19B
May 9, 202513F HOLDINGS REPORTQ/E Mar 2025335 pos · $120.96B
Feb 10, 202513F HOLDINGS REPORTQ/E Dec 2024329 pos · $129.12B
Nov 8, 202413F HOLDINGS REPORTQ/E Sep 2024336 pos · $136.01B
Aug 9, 202413F HOLDINGS REPORTQ/E Jun 2024332 pos · $138.13B
May 14, 202413F HOLDINGS REPORTQ/E Mar 2024335 pos · $134.08B
Nov 13, 202313F HOLDINGS REPORTQ/E Dec 2023331 pos · $118.47B

Top 20 Holdings — Dec 2025

#	Issuer	Ticker	Shares	Value	% of Portfolio
1	ELI LILLY & CO	LLY	9,265,782	$9.96B	9.90%
2	MICRON TECHNOLOGY INC	MU	24,794,936	$7.08B	7.04%
3	ALPHABET INC	GOOG	15,128,289	$4.74B	4.71%
4	MICROSOFT CORP	MSFT	7,287,520	$3.52B	3.51%
5	KLA CORP	KLAC	2,875,962	$3.49B	3.48%
6	ASTRAZENECA PLC	AZN	36,915,261	$3.39B	3.38%
7	NVIDIA CORPORATION	NVDA	17,227,520	$3.21B	3.20%
8	BOSTON SCIENTIFIC CORP	BSX	31,096,184	$2.97B	2.95%
9	AMGEN INC	AMGN	8,904,979	$2.91B	2.90%
10	TESLA INC	TSLA	6,317,420	$2.84B	2.83%
11	AMAZON COM INC	AMZN	12,256,188	$2.83B	2.81%
12	INTEL CORP	INTC	76,132,268	$2.81B	2.79%
13	ALIBABA GROUP HLDG LTD	BBAAY	18,977,436	$2.78B	2.77%
14	BIOGEN INC	BIIB	14,757,997	$2.60B	2.58%
15	FEDEX CORP	FDX	8,512,671	$2.46B	2.45%
16	SCHWAB CHARLES CORP	SCHW-PJ	23,276,071	$2.33B	2.31%
17	SOUTHWEST AIRLS CO	844741108	47,392,095	$1.96B	1.95%
18	ALPHABET INC	GOOG	5,762,640	$1.81B	1.80%
19	UNITED AIRLS HLDGS INC	UNTCW	15,978,490	$1.79B	1.78%
20	TEXAS INSTRS INC	882508104	10,084,686	$1.75B	1.74%