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Funds (13F)

Primecap Management Co

Backtest from 16 Aug 2013 to 2 Nov 2026 · weekly · hypothetical

Watch this strategy
Return a year
+16.7%
S&P 500 +14.1%
Last 12 months
+25.8%
S&P 500 +12.1%
Sharpe ratio
0.81
S&P 500 0.78
Biggest drop
−34.1%
S&P 500 −31.8%
$10.0k$20.0k$40.0k$80.0k 2013201520172019202120232025 $77.0k$57.0k
Primecap Management CoS&P 500 $10,000 in Primecap Management Co from 16 Aug 2013 against the S&P 500 (total return) over the same dates, marked weekly, log scale. Hypothetical: before taxes and trading costs.

About

Copies Primecap Management Co's quarterly 13F holdings in the companies we cover, weighted by reported value: it buys on the first trading day after each 13F is filed (up to 45 days after the quarter) and holds until the next filing. A 13F shows long US-listed positions only, at the quarter's end, so this misses shorts, cash, bonds, non-US holdings and trading within the quarter.

Primecap Management Co's 13F holdings →

Key statistics

MeasureStrategyS&P 500
Return a year (compound)+16.7%+14.1%
Total return+670%+470%
Last 12 months+25.8%+12.1%
Last 3 months−1.6%—
Last month−7.5%—
This year so far+18.6%—
Volatility a year18.8%16.0%
Sharpe ratio0.810.78
Biggest drop−34.1%−31.8%
Beta to the S&P 5001.101.00
Alpha a year (t-statistic)+1.5% (0.82)—
Share of weeks up59%—

Sharpe ratio uses returns above the 3-month Treasury bill rate. Alpha is the yearly return left after allowing for the strategy's exposure to the S&P 500 (CAPM); a t-statistic below about 2 means it cannot be told apart from luck.

Insights

CompanyWeightHeld sinceReturn since
MU13.5%——
LLY6.7%——
INTC6.4%——
KLAC3.8%——
GOOGL3.2%——
FLEX2.3%——
AZN2.1%——
NVDA2.1%——
BIIB2.0%——
AMZN1.7%——
MSFT1.6%——
TSLA1.6%——
FDX1.6%——
TXN1.5%——
LUV1.5%——
AMGN1.5%——
SCHW1.4%——
UAL1.4%——
BSX1.3%——
ROST1.2%——
BABA1.1%——
DAL1.0%——
V0.9%——
BMY0.9%——
TJX0.9%——
ONC0.9%——
RJF0.8%——
NTAP0.8%——
GSK0.8%——
AAL0.8%——
BIDU0.8%——
ADI0.8%——
JBL0.7%——
COP0.7%——
ELAN0.7%——
JPM0.7%——
ADBE0.7%——
NTRS0.6%——
GLW0.6%——
TMO0.6%——
CAT0.6%——
MRVL0.5%——
BMRN0.5%——
NXT0.5%——
ORCL0.5%——
HPE0.5%——
AMAT0.5%——
IEX0.5%——
ASML0.4%——
DIS0.4%——
RCL0.4%——
XMTR0.4%——
ILMN0.4%——
ACM0.4%——
FDXF0.4%——
AMD0.4%——
J0.3%——
CSCO0.3%——
ENTG0.3%——
WFC0.3%——
TDG0.3%——
HPQ0.3%——
AAPL0.3%——
ERIC0.3%——
LIN0.3%——
DLTR0.3%——
FICO0.3%——
GKOS0.3%——
PYPL0.3%——
CME0.3%——
MAT0.3%——
USFD0.3%——
SNPS0.2%——
META0.2%——
MKTX0.2%——
CW0.2%——
BAH0.2%——
CVX0.2%——
BNY0.2%——
DHR0.2%——
ALB0.2%——
MRSH0.2%——
RYTM0.2%——
BNTX0.2%——
PANW0.2%——
LIVN0.2%——
NFLX0.2%——
MA0.2%——
WDC0.2%——
ZBH0.2%——
C0.2%——
NSC0.2%——
SYY0.2%——
EW0.2%——
PFGC0.2%——
INTU0.2%——
MDB0.2%——
CARR0.2%——
AVGO0.2%——
FORM0.2%——
BURL0.2%——
AMTM0.1%——
CVS0.1%——
SPCX0.1%——
TER0.1%——
GTLB0.1%——
UPS0.1%——
KMX0.1%——
BA0.1%——
PGR0.1%——
SYK0.1%——
UNP0.1%——
EBAY0.1%——
OKTA0.1%——
KEYS0.1%——
EOG0.1%——
TRMB0.1%——
AME0.1%——
OLED0.1%——
FLUT0.1%——
STX0.1%——
A0.1%——
BAC0.1%——
ALK0.1%——
XPEV0.1%——
SPOT0.1%——
DELL0.1%——
XNCR0.1%——
CCL0.1%——
CIEN0.1%——
JBHT0.1%——
PM0.1%——
GRAL0.1%——
NTNX0.1%——
Q0.1%——
OTIS0.1%——
INDI0.1%——
WHR0.1%——
GD0.1%——
LYV0.1%——
ALKS0.1%——
EVR0.1%——
ROK0.1%——
WSC0.1%——
XPO0.1%——
ADSK0.1%——
ACLS0.1%——
IMCR0.1%——
TXT0.1%——
ZM0.1%——

Weighted by reported value in the latest 13F, held until the next filing.

PeriodReturn a yearS&P 500SharpeS&P 500Biggest dropBetaAlpha (t)
Whole backtest16 Aug 2013 to 2 Nov 2026+16.7%+14.1%0.810.78−34.1%1.10+1.5% (0.82)
2018 onwards5 Jan 2018 to 2 Nov 2026+14.3%+13.9%0.610.66−34.1%1.09−0.2% (−0.07)
Last three years3 Nov 2023 to 2 Nov 2026+25.2%+21.8%1.121.16−19.1%1.11+1.6% (0.34)
Last year7 Nov 2025 to 2 Nov 2026+26.4%+14.2%1.220.84−10.3%1.16+9.2% (0.90)
DateCompanyAction
21 Aug 2026WINGBought
21 Aug 2026SPCXBought
21 Aug 2026MCKBought
21 Aug 2026HONABought
21 Aug 2026HONBought
21 Aug 2026FRVOBought
21 Aug 2026FHNBought
21 Aug 2026FDXFBought
21 Aug 2026DXCMBought
21 Aug 2026DVNBought
21 Aug 2026DDBought
21 Aug 2026CCLBought
21 Aug 2026BMNRBought
15 May 2026XELBought
15 May 2026WMGBought
15 May 2026WMBought
15 May 2026SNDKBought
15 May 2026PVLABought
15 May 2026LHXBought
15 May 2026ITTBought
15 May 2026FITBBought
15 May 2026AZNBought
13 Feb 2026VNOMBought
13 Feb 2026THGBought
13 Feb 2026SYNABought

Dated at the rebalance that made the change.

DateCompanyAction
21 Aug 2026MDTSold
21 Aug 2026HCATSold
21 Aug 2026FITBSold
15 May 2026SOLSSold
15 May 2026CRCLSold
13 Feb 2026WOLFSold
13 Feb 2026VSXYSold
13 Feb 2026SSYSSold
13 Feb 2026SSTKSold
13 Feb 2026OPTUSold
13 Feb 2026NRIXSold
13 Feb 2026LKFTSold
13 Feb 2026KYNBSold
13 Feb 2026GESold
13 Feb 2026FIVESold
13 Feb 2026EPRSold
13 Feb 2026DUOLSold
13 Feb 2026AMHSold
14 Nov 2025SPHRSold
14 Nov 2025SNDKSold
14 Nov 2025OSURSold
14 Nov 2025NICESold
14 Nov 2025JELDSold
14 Nov 2025HUBSSold
14 Nov 2025GHSold

Dated at the rebalance that made the change.

Backtests are hypothetical and use today's listed companies only, which flatters results. Past performance does not predict future returns. This is research, not investment advice. How we backtest