Q2 2026 13F · SEC CIK 902367

Blair William & Co/il

Investment managerFiled 2026-08-11 for Q2 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $38.4B
Reported positions: 1,977
Top holdings a year, 3 yrs: +13.8%
Average holding period: 9.9 yrs

Blair William & Co/il is an investment manager that reported 1,977 positions worth $38.4B in its Q2 2026 13F, filed 2026-08-11. Its largest holdings were Apple Inc (AAPL, 4.3%), Amazon Com Inc (AMZN, 3.6%), Microsoft Corp (MSFT, 3.3%). A portfolio copying its top holdings returned 13.8% a year over the last 3 years, against 20.4% for the S&P 500.

Blair William & Co/il holdings largest 50 of 1,977 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.

Blair William & Co/il 13F holdings
Stock	% of 13F value	Q1 2026	Shares	Share change	Reported value
AAPLApple Inc	4.3%	4.3%	5,731,525	-3.4%	$1.7B
AMZNAmazon Com Inc	3.6%	3.6%	5,875,124	-3.0%	$1.4B
MSFTMicrosoft Corp	3.3%	3.7%	3,442,574	-1.6%	$1.3B
NVDANvidia Corporation	2.8%	2.7%	5,374,424	-1.0%	$1.1B
GOOGAlphabet Inc	2.7%	2.5%	2,953,724	-2.7%	$1.0B
GOOGLAlphabet Inc	2.2%	2.0%	2,402,621	-1.4%	$858.6M
GEVGe Vernova Inc	2.0%	1.7%	659,673	-0.7%	$775.0M
JPMJpmorgan Chase & Co	1.9%	1.9%	2,270,360	-1.6%	$743.2M
SPYState Str Spdr S&p 500 ETF T	1.6%	1.6%	848,034	+0.3%	$633.3M
VVisa Inc	1.6%	1.6%	1,841,604	-0.2%	$631.8M
COSTCostco Wholesale Corporation	1.3%	1.5%	524,692	+0.7%	$490.8M
IDXXIdexx Labs Inc	1.3%	1.5%	918,556	-2.9%	$483.6M
APHAmphenol Corp	1.1%	0.9%	2,504,409	-0.6%	$441.6M
MAMastercard Incorporated	1.1%	1.3%	842,350	-8.8%	$432.6M
RSPInvesco Exchange Traded Fd T	1.1%	0.9%	1,982,392	+18.0%	$421.8M
PANWPalo Alto Networks Inc	1.1%	0.6%	1,226,519	-6.0%	$418.3M
LLYEli Lilly & Co	1.1%	0.9%	347,098	+7.1%	$416.3M
METAMeta Platforms Inc	1.0%	1.2%	670,881	-7.0%	$377.9M
VEUVanguard Intl Equity Index F	1.0%	0.9%	4,479,218	+7.5%	$375.1M
MUMicron Technology Inc	0.9%	—	315,878	—	$364.6M
IVVIshares Tr	0.9%	0.9%	484,704	-0.2%	$363.0M
FASTFastenal Co	0.9%	1.0%	7,407,059	+0.5%	$355.8M
AVGOBroadcom Inc	0.9%	0.8%	929,716	+1.2%	$351.2M
ABBVAbbvie Inc	0.8%	0.8%	1,287,857	-3.5%	$324.1M
VEAVanguard Ftse Developed Markets Index Fu	0.8%	0.7%	4,291,023	+11.1%	$305.7M
BWXTBwx Technologies Inc	0.8%	0.8%	1,556,417	+8.2%	$303.0M
VOOVanguard Index Fds	0.8%	0.7%	419,372	+5.5%	$288.0M
ANETArista Networks Inc	0.7%	—	1,604,716	—	$272.6M
VTVVanguard Index Fds	0.7%	0.7%	1,232,497	+5.7%	$268.6M
QQQInvesco Qqq Tr	0.7%	0.5%	359,219	+15.5%	$264.5M
WMTWalmart Inc	0.7%	0.8%	2,270,879	-4.4%	$257.2M
HDHome Depot Inc	0.6%	0.7%	697,590	-8.4%	$246.0M
JNJJohnson & Johnson	0.6%	0.7%	956,262	+0.1%	$242.9M
BRK-BBerkshire Hathaway Inc Del	0.6%	0.7%	483,586	-2.4%	$242.0M
PSTGEverpure Inc	0.6%	0.5%	3,048,094	+4.5%	$240.2M
ECLEcolab Inc	0.6%	0.7%	854,294	-1.4%	$238.0M
WSOWatsco	0.6%	0.6%	564,024	-3.2%	$235.0M
AXPAmerican Express Co	0.6%	0.6%	680,321	-1.9%	$230.1M
PGRProgressive Corp	0.6%	0.7%	1,034,104	-15.2%	$225.9M
NOWServicenow Inc	0.6%	0.5%	2,240,030	+24.4%	$222.4M
TDGTransdigm Group Inc	0.6%	0.6%	164,960	-0.8%	$219.7M
SYKStryker Corporation	0.6%	0.8%	684,392	-19.3%	$215.5M
IWMIshares Tr	0.5%	—	701,051	—	$210.6M
CRWDCrowdstrike Hldgs Inc	0.5%	—	272,235	—	$207.8M
UBERUber Technologies Inc	0.5%	0.7%	2,794,590	-15.3%	$201.7M
VTIVanguard Index Fds	0.5%	—	528,525	—	$195.6M
AAONAaon Inc	0.5%	—	1,533,434	—	$194.5M
BABoeing Co	0.5%	0.5%	878,396	-4.7%	$190.1M
DHRDanaher Corp Del	0.5%	0.7%	971,095	-25.1%	$185.0M
CTASCintas Corp	0.5%	0.5%	1,063,530	+9.2%	$180.9M

What Blair William & Co/il 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

NOW Servicenow Inc+24.4% shares
RSP Invesco Exchange Traded Fd T+18.0% shares
QQQ Invesco Qqq Tr+15.5% shares
VEA Vanguard Ftse Developed Markets Index Fu+11.1% shares
CTAS Cintas Corp+9.2% shares
BWXT Bwx Technologies Inc+8.2% shares
VEU Vanguard Intl Equity Index F+7.5% shares
LLY Eli Lilly & Co+7.1% shares

Reduced

Left the top 50

ICE Intercontinental Exchange Incwas 0.7%
ISRG Intuitive Surgical Incwas 0.6%
VEEV Veeva Sys Incwas 0.5%
NFLX Netflix Inc.was 0.5%
GLD Spdr Gold Trwas 0.5%
XOM Exxon Mobil Corpwas 0.5%

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: +9.6% /yr; S&P 500 +20.1%
3 years: +13.8% /yr; S&P 500 +20.4%
5 years: +4.9% /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
Q2 2026	$38.4B	1,977
Q1 2026	$34.9B	1,899
Q4 2025	$37.3B	1,864
Q3 2025	$37.6B	1,840
Q2 2025	$36.0B	1,817
Q1 2025	$33.2B	1,793
Q4 2024	$34.4B	1,805
Q3 2024	$34.0B	1,809
Q2 2024	$32.4B	1,794
Q1 2024	$31.8B	1,776
Q4 2023	$29.3B	1,768
Q3 2023	$26.1B	1,772

Questions about Blair William & Co/il's portfolio

What stocks does Blair William & Co/il own?

Blair William & Co/il's latest 13F, for Q2 2026 and filed Aug 11, 2026, lists 1,977 positions worth $38.4B. The largest are Apple Inc (AAPL) at 4.3%, Amazon Com Inc (AMZN) at 3.6%, Microsoft Corp (MSFT) at 3.3%, Nvidia Corporation (NVDA) at 2.8% and Alphabet Inc (GOOG) at 2.7%.

What did Blair William & Co/il buy last quarter?

In Q2 2026, Blair William & Co/il added Servicenow Inc (NOW) (+24.4% shares), Invesco Exchange Traded Fd T (RSP) (+18.0% shares) and Invesco Qqq Tr (QQQ) (+15.5% shares), compared with its Q1 2026 filing.

What did Blair William & Co/il sell last quarter?

In Q2 2026, Blair William & Co/il cut from its top 50 Intercontinental Exchange Inc (ICE), cut from its top 50 Intuitive Surgical Inc (ISRG), cut from its top 50 Veeva Sys Inc (VEEV), cut from its top 50 Netflix Inc. (NFLX), cut from its top 50 Spdr Gold Tr (GLD), Danaher Corp Del (DHR) (-25.1% shares), Stryker Corporation (SYK) (-19.3% shares) and Uber Technologies Inc (UBER) (-15.3% shares), compared with its Q1 2026 filing.

How has Blair William & Co/il's portfolio performed?

A portfolio copying Blair William & Co/il's 20 largest 13F holdings each quarter, from the day each filing was public, returned +13.8% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +9.6% against +20.1%. Over 5 years: +4.9% a year against +11.6%.

When is Blair William & Co/il's next 13F filing due?

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