Q3 2026 13F · SEC CIK 1168889

Carderock Capital Management Inc

Wealth managerFiled 2026-10-22 for Q3 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $435.3M
Reported positions: 70
Top holdings a year, 3 yrs: +19.6%
Assets under management: $677.0M

Carderock Capital Management Inc is a wealth manager that reported 70 positions worth $435.3M in its Q3 2026 13F, filed 2026-10-22. Its largest holdings were Lam Research Corp (LRCX, 4.8%), Alphabet Inc (GOOGL, 4.5%), Apple Inc (AAPL, 3.9%). A portfolio copying its top holdings returned 19.6% a year over the last 3 years, against 20.4% for the S&P 500.

Carderock Capital Management Inc holdings largest 50 of 70 positions.

Weights are shares of the filer's total reported 13F value, compared with Q2 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.

Carderock Capital Management Inc 13F holdings
Stock	% of 13F value	Q2 2026	Shares	Share change	Reported value
LRCXLam Research Corp	4.8%	7.0%	63,639	-13.8%	$20.9M
GOOGLAlphabet Inc	4.5%	4.4%	56,333	-0.3%	$19.4M
AAPLApple Inc	3.9%	3.3%	50,963	-1.8%	$17.0M
APHAmphenol Corp	3.9%	4.1%	199,463	+87.2%	$16.8M
MSFTMicrosoft Corp	3.5%	2.2%	29,956	+9.2%	$15.4M
LLYEli Lilly & Co	3.4%	3.4%	12,679	-1.1%	$14.7M
FTNTFortinet Inc	3.3%	3.1%	81,241	-11.1%	$14.5M
TMOThermo Fisher Scientific Inc	3.3%	2.3%	21,389	+2.5%	$14.4M
MAMastercard Incorporated	3.3%	2.7%	25,724	+5.6%	$14.2M
NVDANvidia Corporation	2.9%	2.5%	55,347	-2.1%	$12.6M
MPWRMonolithic Pwr Sys Inc	2.8%	3.1%	9,054	-12.1%	$12.2M
HEIHeico Corp New	2.7%	3.1%	39,073	-2.5%	$11.8M
AMEAmetek Inc	2.6%	2.4%	46,503	+1.4%	$11.5M
PWRQuanta Svcs Inc	2.6%	3.1%	17,526	-10.7%	$11.3M
MNSTMonster Beverage Corp New	2.4%	2.6%	246,880	+98.6%	$10.3M
COSTCostco Wholesale Corporation	2.3%	2.2%	10,830	+0.1%	$9.9M
PHParker-Hannifin Corp	2.2%	2.4%	10,020	-9.8%	$9.6M
MSIMotorola Solutions Inc	2.0%	1.7%	19,819	+3.9%	$8.8M
CTASCintas Corp	2.0%	1.6%	44,495	+1.2%	$8.7M
IDXXIdexx Labs Inc	2.0%	1.9%	16,609	-0.1%	$8.7M
ORLYOreilly Automotive Inc	2.0%	2.0%	100,424	-0.7%	$8.6M
FSSFederal Signal Corp	1.9%	2.1%	76,151	+1.8%	$8.4M
STESteris PLC	1.9%	1.9%	39,766	-0.8%	$8.4M
SHWSherwin Williams Co	1.9%	1.9%	25,030	-1.4%	$8.1M
CDNSCadence Design System Inc	1.8%	2.0%	23,731	-4.7%	$7.8M
GWWWw Grainger Inc	1.8%	2.1%	6,195	-9.9%	$7.7M
LINLinde PLC	1.7%	1.8%	15,796	+1.2%	$7.5M
ACGLArch Cap Group Ltd	1.5%	1.5%	71,495	+1.6%	$6.6M
SPGIS&p Global Inc	1.5%	1.5%	16,578	+1.4%	$6.5M
ITWIllinois Tool Wks Inc	1.5%	1.4%	25,079	+2.7%	$6.5M
MCOMoodys Corp	1.5%	1.4%	14,193	+3.2%	$6.4M
WATWaters Corp	1.5%	0.6%	14,404	+94.2%	$6.3M
ISRGIntuitive Surgical Inc	1.4%	1.6%	15,302	-16.0%	$6.2M
APDAir Products and Chemicals I	1.4%	1.5%	21,658	-7.9%	$6.0M
ADPAutomatic Data Processing in	1.4%	1.2%	23,177	-2.0%	$6.0M
SYKStryker Corporation	1.4%	1.5%	21,463	-0.8%	$5.9M
AONAon PLC	1.3%	1.7%	20,896	-11.3%	$5.8M
WCNWaste Connections Inc	1.3%	1.3%	35,474	+1.3%	$5.5M
IRIngersoll Rand Inc	1.2%	1.2%	67,564	+3.6%	$5.1M
ETNEaton Corp PLC	1.1%	0.9%	11,197	+22.2%	$4.8M
AJGGallagher Arthur J & Co	1.1%	0.8%	20,947	+28.3%	$4.8M
WMTWalmart Inc	1.1%	1.1%	44,088	-1.7%	$4.6M
TJXTjx Cos Inc New	0.9%	1.1%	29,235	-15.2%	$3.9M
INTCIntel Corp	0.9%	1.0%	32,000	+0.0%	$3.8M
HDHome Depot Inc	0.8%	1.6%	11,579	-42.2%	$3.3M
BRK-ABerkshire Hathaway Inc Del	0.5%	0.5%	3	+0.0%	$2.2M
AMZNAmazon Com Inc	0.4%	—	7,652	—	$1.9M
LLoews Corp	0.3%	0.3%	12,000	+0.0%	$1.3M
XOMExxonmobil Holdings Corp	0.3%	—	7,183	—	$1.2M
BRBroadridge Finl Solutions in	0.3%	—	6,928	—	$1.1M

What Carderock Capital Management Inc bought and sold in Q3 2026, against Q2 2026.

New positions

Q2 2026's filing was too long to tell new positions apart.

Added to

MNST Monster Beverage Corp New+98.6% shares
WAT Waters Corp+94.2% shares
APH Amphenol Corp+87.2% shares
AJG Gallagher Arthur J & Co+28.3% shares
ETN Eaton Corp PLC+22.2% shares
MSFT Microsoft Corp+9.2% shares
MA Mastercard Incorporated+5.6% shares

Reduced

HD Home Depot Inc-42.2% shares
ISRG Intuitive Surgical Inc-16.0% shares
TJX Tjx Cos Inc New-15.2% shares
LRCX Lam Research Corp-13.8% shares
MPWR Monolithic Pwr Sys Inc-12.1% shares
AON Aon PLC-11.3% shares
FTNT Fortinet Inc-11.1% shares
PWR Quanta Svcs Inc-10.7% shares

Left the top 50

Share counts compared with the Q2 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: +25.9% /yr; S&P 500 +20.1%
3 years: +19.6% /yr; S&P 500 +20.4%
5 years: +9.1% /yr; S&P 500 +11.6%

A portfolio of the filer's 20 largest 13F positions, weighted by value, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 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
Q3 2026	$435.3M	70
Q2 2026	$455.8M	67
Q1 2026	$404.8M	73
Q4 2025	$412.7M	69
Q3 2025	$411.3M	72
Q2 2025	$390.4M	139
Q1 2025	$377.3M	70
Q4 2024	$398.7M	73
Q3 2024	$423.6M	73
Q2 2024	$382.2M	69
Q1 2024	$356.8M	68
Q4 2023	$362.1M	61

Questions about Carderock Capital Management Inc's portfolio

What stocks does Carderock Capital Management Inc own?

Carderock Capital Management Inc's latest 13F, for Q3 2026 and filed Oct 22, 2026, lists 70 positions worth $435.3M. The largest are Lam Research Corp (LRCX) at 4.8%, Alphabet Inc (GOOGL) at 4.5%, Apple Inc (AAPL) at 3.9%, Amphenol Corp (APH) at 3.9% and Microsoft Corp (MSFT) at 3.5%.

What did Carderock Capital Management Inc buy last quarter?

In Q3 2026, Carderock Capital Management Inc added Monster Beverage Corp New (MNST) (+98.6% shares), Waters Corp (WAT) (+94.2% shares) and Amphenol Corp (APH) (+87.2% shares), compared with its Q2 2026 filing.

What did Carderock Capital Management Inc sell last quarter?

In Q3 2026, Carderock Capital Management Inc cut from its top 50 Watsco (WSO), cut from its top 50 Exxon Mobil Corp (XOM), cut from its top 50 Intuit (INTU), Home Depot Inc (HD) (-42.2% shares), Intuitive Surgical Inc (ISRG) (-16.0% shares) and Tjx Cos Inc New (TJX) (-15.2% shares), compared with its Q2 2026 filing.

How has Carderock Capital Management Inc's portfolio performed?

A portfolio copying Carderock Capital Management Inc's 20 largest 13F holdings each quarter, from the day each filing was public, returned +19.6% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +25.9% against +20.1%. Over 5 years: +9.1% a year against +11.6%.

When is Carderock Capital Management Inc's next 13F filing due?

13F filings are due 45 days after each quarter ends. Carderock Capital Management Inc's filing for the quarter ending Dec 31, 2026 is due by Feb 14, 2027; this page updates the day after it is published.

How much money does Carderock Capital Management Inc manage?

Carderock Capital Management Inc reported $677.0M of regulatory assets under management on its latest SEC Form ADV. Its 13F, which covers only US-listed stocks and options, totals $435.3M.