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Primecap Management Co/ca/

CIK:0000763212
Asset Manager
$148B AUM
333 holdings
Pasadena, CA, United States
Founded:1983
35 employees
Latest filing:Jun 30, 2025

PRIMECAP Management Company is an independent investment management firm headquartered in Pasadena, California. Founded in 1983, it is known for managing US-focused equity portfolios for both mutual funds (notably for Vanguard and its own Odyssey Funds) and a limited number of large institutional investors including pension funds and endowments. With a reputation for long-term investment performance and a research-intensive approach, PRIMECAP maintains a small team—35 employees as of 2016—focused almost exclusively on portfolio management and fundamental research. The firm avoids sales and marketing, preferring to keep a low profile in the industry.

Investment Strategy

PRIMECAP Management Company's investment strategy is rooted in fundamental research, long-term value orientation, and decentralized individual decision-making. Portfolio managers independently manage their own segments of each portfolio. The firm emphasizes selecting stocks based on superior growth prospects, often identified through meetings with company management, and holds positions for extended periods (the average holding is 20 years in their flagship Vanguard fund). PRIMECAP avoids groupthink and focuses purely on research, limiting its AUM to maintain its high-conviction investment model.

Top Buys
M
MSFTMICROSOFT CORP
+$1.12B
N
NVDANVIDIA CORPORATION
+$983.9M
O
ORCLORACLE CORP
+$938.1M
K
KLACKLA CORP
+$697.8M
S
SCHWSCHWAB CHARLES CORP
+$640.7M
Top Sells
L
LLYELI LILLY & CO
-$2.73B
A
AMGNAMGEN INC
-$891.1M
F
FDXFEDEX CORP
-$614.9M
S
SONYSONY GROUP CORP
-$544.2M
A
ADBEADOBE INC
-$470.9M

Top Holdings

L
LLYELI LILLY & CO
+7.5%$9.48B
M
MSFTMICROSOFT CORP
+3.6%$4.53B
K
KLACKLA CORP
+3.2%$4.01B
M
MUMICRON TECHNOLOGY INC
+3.1%$3.88B
B
BSXBOSTON SCIENTIFIC CORP
+3.0%$3.72B

Equity Positions (329)

TickerSecurityWeightMarket ValueSharesAvg CostPriceChange (QoQ)
L
LLY
ELI LILLY & CO7.51%$9.48B12,154,908$55.03$779.53-$2.73B
M
MSFT
MICROSOFT CORP3.59%$4.53B9,115,265$28.33$497.41+$1.12B
K
KLAC
KLA CORP3.18%$4.01B4,480,277$60.41$895.74+$697.8M
M
MU
MICRON TECHNOLOGY INC3.07%$3.88B31,465,876$13.30$123.25+$638.8M
B
BSX
BOSTON SCIENTIFIC CORP2.95%$3.72B34,662,722$17.30$107.41+$41.3M

Industry Allocation

PHARMACEUTICAL PREPARATIONS
+14.3%
SEMICONDUCTORS & RELATED DEVICES
+10.7%
SERVICES-PREPACKAGED SOFTWARE
+8.8%
SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC.
+6.8%
SERVICES-BUSINESS SERVICES, NEC
+4.5%