Q2 2026 13F · SEC CIK 763212

Primecap Management Co/ca/

Investment managerFiled 2026-08-14 for Q2 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $169.1B
Reported positions: 324
Top holdings a year, 3 yrs: +29.9%
Average holding period: 10.1 yrs

Primecap Management Co/ca/ is an investment manager that reported 324 positions worth $169.1B in its Q2 2026 13F, filed 2026-08-14. Its largest holdings were Micron Technology Inc (MU, 13.1%), Lilly Eli & Co (LLY, 6.5%), Intel Corp (INTC, 6.2%). A portfolio copying its top holdings returned 29.9% a year over the last 3 years, against 20.4% for the S&P 500.

Primecap Management Co/ca/ holdings largest 50 of 324 positions.

Weights are shares of the filer's total reported 13F value, compared with Q1 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.

Primecap Management Co/ca/ 13F holdings
Stock	% of 13F value	Q1 2026	Shares	Share change	Reported value
MUMicron Technology Inc	13.1%	5.8%	19,217,236	-12.1%	$22.2B
LLYLilly Eli & Co	6.5%	6.7%	9,172,904	-0.5%	$11.0B
INTCIntel Corp	6.2%	2.6%	75,250,958	-0.7%	$10.5B
KLACKla Corp	3.7%	2.8%	20,536,730	+742.5%	$6.2B
GOOGLAlphabet Inc	3.1%	3.4%	14,859,769	-0.9%	$5.3B
FLEXFlex Ltd	2.2%	1.3%	23,358,875	-8.0%	$3.8B
AZNAstrazeneca PLC Ord	2.0%	2.8%	18,095,178	-0.7%	$3.4B
NVDANvidia Corporation Com	2.0%	2.4%	17,079,180	-0.6%	$3.4B
BIIBBiogen Inc	1.9%	2.1%	15,154,606	+2.7%	$3.3B
AMZNAmazon Com Inc Com	1.7%	2.0%	11,962,188	-1.2%	$2.9B
MSFTMicrosoft Corp	1.6%	2.1%	7,140,870	-1.7%	$2.7B
TSLATesla Inc Com	1.5%	1.8%	6,103,030	-0.4%	$2.6B
FDXFedex Corp	1.5%	2.3%	8,156,799	-1.8%	$2.6B
TXNTexas Instruments Inc	1.5%	1.5%	8,514,989	-11.8%	$2.5B
LUVSouthwest Airls Co	1.5%	1.4%	48,797,725	+3.7%	$2.5B
AMGNAmgen Inc Com	1.4%	2.5%	6,756,962	-23.9%	$2.4B
SCHWSchwab Charles Corp	1.4%	1.7%	25,120,895	+7.2%	$2.3B
UALUnited Airls Hldgs Inc	1.3%	1.1%	16,461,630	+4.5%	$2.2B
BSXBoston Scientific Corp	1.3%	1.6%	50,520,914	+55.3%	$2.2B
ROSTRoss Stores Inc.	1.1%	1.6%	9,104,980	-0.7%	$1.9B
GOOGAlphabet Inc	1.1%	1.3%	5,399,060	-5.6%	$1.9B
BABAAlibaba Group Hldg Ltd	1.1%	1.8%	18,611,306	-0.6%	$1.8B
DALDelta Air Lines Inc Com New	1.0%	0.9%	17,521,167	-0.2%	$1.6B
VVisa Inc Com Cl A	0.9%	1.0%	4,268,491	+5.1%	$1.5B
BMYBristol-Myers Squibb Co Com	0.8%	1.2%	24,923,900	-0.2%	$1.4B
TJXTjx Cos Inc New Com	0.8%	1.2%	9,476,020	-1.2%	$1.4B
ONCBeone Medicines Ltd	0.8%	1.2%	5,007,931	+0.7%	$1.4B
RJFRaymond James Finl Inc	0.8%	1.1%	9,242,552	-1.1%	$1.4B
NTAPNetapp Inc	0.8%	0.7%	9,016,690	-0.5%	$1.4B
GSKGsk PLC	0.8%	1.1%	25,182,068	-0.1%	$1.3B
AALAmerican Airlines Group Inc	0.8%	—	70,732,954	—	$1.3B
BIDUBaidu Inc Ads	0.7%	1.0%	11,010,100	-0.4%	$1.3B
ADIAnalog Devices Inc	0.7%	0.8%	3,128,329	-0.2%	$1.2B
JBLJabil Inc	0.7%	0.7%	3,167,120	-3.5%	$1.2B
COPConocophillips	0.7%	1.2%	11,588,365	+0.1%	$1.2B
SONYSony Corporation ADR (jpn)	0.7%	1.0%	59,603,230	+1.8%	$1.2B
ELANElanco Animal Health Inc	0.7%	0.9%	45,445,012	-0.9%	$1.1B
JPMJpmorgan Chase & Co	0.7%	0.8%	3,382,627	-0.6%	$1.1B
ADBEAdobe Inc	0.6%	0.9%	5,227,139	+10.5%	$1.1B
NTRSNorthern Trust Corp.	0.6%	0.7%	6,100,742	-6.8%	$1.1B
GLWCorning Inc.	0.6%	—	4,131,872	—	$1.1B
NVSNovartis AG	0.6%	0.9%	6,592,124	-12.9%	$1.0B
TMOThermo Fisher Scientific Inc	0.6%	0.8%	1,982,271	-0.0%	$993.8M
CATCaterpillar Inc Com	0.5%	0.5%	871,700	-0.1%	$928.3M
MRVLMarvell Technology Inc	0.5%	—	2,757,995	—	$821.6M
BMRNBiomarin Pharmaceutical Inc	0.5%	0.6%	14,190,183	-0.0%	$812.0M
NXTNextpower Inc	0.5%	0.6%	6,688,767	-1.1%	$796.9M
ORCLOracle Corp	0.5%	0.7%	5,386,230	-5.1%	$789.4M
HPEHewlett Packard Enterprise	0.5%	—	17,140,875	—	$773.2M
AMATApplied Matls Inc	0.4%	—	1,042,926	—	$754.0M

What Primecap Management Co/ca/ bought and sold in Q2 2026, against Q1 2026.

New positions

Q1 2026's filing was too long to tell new positions apart.

Added to

KLAC Kla Corp+742.5% shares
BSX Boston Scientific Corp+55.3% shares
ADBE Adobe Inc+10.5% shares
SCHW Schwab Charles Corp+7.2% shares
V Visa Inc Com Cl A+5.1% shares

Reduced

AMGN Amgen Inc Com-23.9% shares
NVS Novartis AG-12.9% shares
MU Micron Technology Inc-12.1% shares
TXN Texas Instruments Inc-11.8% shares
FLEX Flex Ltd-8.0% shares
NTRS Northern Trust Corp.-6.8% shares
GOOG Alphabet Inc-5.6% shares
ORCL Oracle Corp-5.1% shares

Left the top 50

Share counts compared with the Q1 2026 13F; a split also changes share counts. The latest filing lists more than 50 positions, so a position that left the top 50 may still be held.

How the holdings did against the S&P 500.

1 year: +70.8% /yr; S&P 500 +20.1%
3 years: +29.9% /yr; S&P 500 +20.4%
5 years: +18.9% /yr; S&P 500 +11.6%

A portfolio of the filer's 20 largest 13F positions, weighted by value and rebuilt each quarter on the day the filing became public. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.

Reported 13F value by quarter.

13F value by quarter
Quarter	13F value	Positions
Q2 2026	$169.1B	324
Q1 2026	$127.0B	320
Q4 2025	$132.1B	319
Q3 2025	$130.6B	327
Q2 2025	$126.2B	333
Q1 2025	$121.0B	335
Q4 2024	$129.1B	329
Q3 2024	$136.0B	336
Q2 2024	$138.1B	332
Q1 2024	$134.1B	335
Q4 2023	$126.3B	334
Q3 2023	$118.5B	331

Questions about Primecap Management Co/ca/'s portfolio

What stocks does Primecap Management Co/ca/ own?

Primecap Management Co/ca/'s latest 13F, for Q2 2026 and filed Aug 14, 2026, lists 324 positions worth $169.1B. The largest are Micron Technology Inc (MU) at 13.1%, Lilly Eli & Co (LLY) at 6.5%, Intel Corp (INTC) at 6.2%, Kla Corp (KLAC) at 3.7% and Alphabet Inc (GOOGL) at 3.1%.

What did Primecap Management Co/ca/ buy last quarter?

In Q2 2026, Primecap Management Co/ca/ added Kla Corp (KLAC) (+742.5% shares), Boston Scientific Corp (BSX) (+55.3% shares) and Adobe Inc (ADBE) (+10.5% shares), compared with its Q1 2026 filing.

What did Primecap Management Co/ca/ sell last quarter?

In Q2 2026, Primecap Management Co/ca/ cut from its top 50 Aecom (ACM), cut from its top 50 Royal Caribbean Group (RCL), cut from its top 50 Idex Corp (IEX), cut from its top 50 Wells Fargo Co New (WFC), cut from its top 50 Disney Walt Co (DIS), Amgen Inc Com (AMGN) (-23.9% shares), Novartis AG (NVS) (-12.9% shares) and Micron Technology Inc (MU) (-12.1% shares), compared with its Q1 2026 filing.

How has Primecap Management Co/ca/'s portfolio performed?

A portfolio copying Primecap Management Co/ca/'s 20 largest 13F holdings each quarter, from the day each filing was public, returned +29.9% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +70.8% against +20.1%. Over 5 years: +18.9% a year against +11.6%.

When is Primecap Management Co/ca/'s next 13F filing due?

13F filings are due 45 days after each quarter ends. Primecap Management Co/ca/'s filing for the quarter ending Sep 30, 2026 is due by Nov 14, 2026; this page updates the day after it is published.