BLAIR WILLIAM & CO/IL

CHICAGO, IL · CIK 902367 · 13F filing filed 2026-08-11

SEC-registered investment adviser since 1947 · limited liability company

Assets managed$64.3bn
Staff492 · 231 in investment roles
Main clients (by assets)High net worth individuals 71%, Companies 13%, Individuals 11%
Private funds21 · $114.7m gross assets
Websitewilliamblair.com
Form ADV · 2026-03-31SEC adviser record

Legal entityWILLIAM BLAIR & COMPANY, L.L.C. (US)

$38.4bn reported value +10.0% vs Q1 2026

1,998positions

26.3%in top 10

167 new 892 added 708 reduced 91 sold out vs Q1 2026

Holdings, Q2 2026

The small lines show how much was held over the last 4 quarters (adjusted for stock splits).

#	Security	Ticker	Shares	Value	% of portfolio	Change	Shares change
1	APPLE INC COM AAPL	AAPL	5,731,525	$1.7bn4.32%	4.32%	Reduced -199.4k	-199,389 -3.4%
2	AMAZON COM INC COM AMZN	AMZN	5,875,124	$1.4bn3.65%	3.65%	Reduced -182.8k	-182,814 -3.0%
3	MICROSOFT CORP COM MSFT	MSFT	3,442,574	$1.3bn3.35%	3.35%	Reduced -55.5k	-55,536 -1.6%
4	NVIDIA CORPORATION COM NVDA	NVDA	5,374,424	$1.1bn2.80%	2.80%	Reduced -53.5k	-53,451 -1.0%
5	ALPHABET INC CAP STK CL C GOOG	GOOG	2,953,724	$1.0bn2.72%	2.72%	Reduced -82.0k	-82,041 -2.7%
6	ALPHABET INC CAP STK CL A GOOGL	GOOGL	2,402,621	$858.6m2.24%	2.24%	Reduced -33.5k	-33,496 -1.4%
7	GE VERNOVA INC COM GEV	GEV	659,673	$775.0m2.02%	2.02%	Reduced -4.9k	-4,930 -0.7%
8	JPMORGAN CHASE & CO COM JPM	JPM	2,270,360	$743.2m1.94%	1.94%	Reduced -36.9k	-36,893 -1.6%
9	SPDR S&P 500 ETF TR TR UNIT SPY	SPY	848,034	$633.3m1.65%	1.65%	Added +2.7k	+2,740 0.3%
10	VISA INC COM CL A V	V	1,841,604	$631.8m1.65%	1.65%	Reduced -3.0k	-2,979 -0.2%
11	COSTCO WHSL CORP NEW COM COST	COST	524,692	$490.8m1.28%	1.28%	Added +3.4k	+3,415 0.7%
12	IDEXX LABS INC COM IDXX	IDXX	918,556	$483.6m1.26%	1.26%	Reduced -27.8k	-27,780 -2.9%
13	AMPHENOL CORP CL A APH	APH	2,504,409	$441.6m1.15%	1.15%	Reduced -15.9k	-15,910 -0.6%
14	MASTERCARD INCORPORATED CL A MA	MA	842,350	$432.6m1.13%	1.13%	Reduced -81.1k	-81,055 -8.8%
15	INVESCO EXCHANGE TRADED FD T S&P500 EQL WGT RSP	RSP	1,982,392	$421.8m1.10%	1.10%	Added +301.8k	+301,788 18.0%
16	PALO ALTO NETWORKS INC COM PANW	PANW	1,226,519	$418.3m1.09%	1.09%	Reduced -78.3k	-78,339 -6.0%
17	ELI LILLY & CO COM LLY	LLY	347,098	$416.3m1.08%	1.08%	Added +23.1k	+23,080 7.1%
18	META PLATFORMS INC CL A META	META	670,881	$377.9m0.98%	0.98%	Reduced -50.8k	-50,839 -7.0%
19	VANGUARD INTL EQUITY INDEX F ALLWRLD EX US VEU	VEU	4,479,218	$375.1m0.98%	0.98%	Added +310.6k	+310,593 7.5%
20	MICRON TECHNOLOGY INC COM MU	MU	315,878	$364.6m0.95%	0.95%	Reduced -16.4k	-16,433 -5.0%
21	ISHARES TR CORE S&P500 ETF IVV	IVV	484,704	$363.0m0.95%	0.95%	Reduced -1.1k	-1,135 -0.2%
22	FASTENAL CO COM FAST	FAST	7,407,059	$355.8m0.93%	0.93%	Added +33.4k	+33,352 0.5%
23	BROADCOM INC COM AVGO	AVGO	929,716	$351.2m0.91%	0.91%	Added +11.4k	+11,388 1.2%
24	ABBVIE INC COM ABBV	ABBV	1,287,857	$324.1m0.84%	0.84%	Reduced -46.3k	-46,252 -3.5%
25	VANGUARD TAX-MANAGED FDS VAN FTSE DEV MKT VEA	VEA	4,291,023	$305.7m0.80%	0.80%	Added +428.9k	+428,937 11.1%
26	BWX TECHNOLOGIES INC COM BWXT	BWXT	1,556,417	$303.0m0.79%	0.79%	Added +118.3k	+118,292 8.2%
27	VANGUARD INDEX FDS S&P 500 ETF SHS VOO	VOO	419,372	$288.0m0.75%	0.75%	Added +22.0k	+21,992 5.5%
28	ARISTA NETWORKS INC COM SHS ANET	ANET	1,604,716	$272.6m0.71%	0.71%	Added +453.5k	+453,489 39.4%
29	VANGUARD INDEX FDS VALUE ETF VTV	VTV	1,232,497	$268.6m0.70%	0.70%	Added +66.6k	+66,585 5.7%
30	INVESCO QQQ TR UNIT SER 1 QQQ	QQQ	359,219	$264.5m0.69%	0.69%	Added +48.2k	+48,203 15.5%
31	WALMART INC COM WMT	WMT	2,270,879	$257.2m0.67%	0.67%	Reduced -103.4k	-103,403 -4.4%
32	HOME DEPOT INC COM HD	HD	697,590	$246.0m0.64%	0.64%	Reduced -63.8k	-63,829 -8.4%
33	JOHNSON & JOHNSON COM JNJ	JNJ	956,262	$242.9m0.63%	0.63%	Added +630	+630 0.1%
34	BERKSHIRE HATHAWAY INC DEL CL B NEW BRK.B	BRK.B	483,586	$242.0m0.63%	0.63%	Reduced -11.7k	-11,736 -2.4%
35	PURE STORAGE INC CL A P	P	3,048,094	$240.2m0.63%	0.63%	Added +130.0k	+130,048 4.5%
36	ECOLAB INC COM ECL	ECL	854,294	$238.0m0.62%	0.62%	Reduced -12.1k	-12,117 -1.4%
37	WATSCO INC COM WSO	WSO	564,024	$235.0m0.61%	0.61%	Reduced -18.7k	-18,676 -3.2%
38	AMERICAN EXPRESS CO COM AXP	AXP	680,321	$230.1m0.60%	0.60%	Reduced -13.4k	-13,446 -1.9%
39	PROGRESSIVE CORP COM PGR	PGR	1,034,104	$225.9m0.59%	0.59%	Reduced -185.6k	-185,645 -15.2%
40	SERVICENOW INC COM NOW	NOW	2,240,030	$222.4m0.58%	0.58%	Added +439.0k	+439,042 24.4%
41	TRANSDIGM GROUP INC COM TDG	TDG	164,960	$219.7m0.57%	0.57%	Reduced -1.3k	-1,288 -0.8%
42	STRYKER CORPORATION COM SYK	SYK	684,392	$215.5m0.56%	0.56%	Reduced -163.3k	-163,309 -19.3%
43	ISHARES TR RUSSELL 2000 ETF IWM	IWM	701,051	$210.6m0.55%	0.55%	Added +72.8k	+72,823 11.6%
44	CROWDSTRIKE HLDGS INC CL A CRWD	CRWD	272,235	$207.8m0.54%	0.54%	Added +19.9k	+19,856 7.9%
45	UBER TECHNOLOGIES INC COM UBER	UBER	2,794,590	$201.7m0.53%	0.53%	Reduced -505.0k	-505,006 -15.3%
46	VANGUARD INDEX FDS TOTAL STK MKT VTI	VTI	528,525	$195.6m0.51%	0.51%	Added +156.2k	+156,154 41.9%
47	AAON INC COM PAR $0.004 AAON	AAON	1,533,434	$194.5m0.51%	0.51%	Reduced -88.8k	-88,769 -5.5%
48	BOEING CO COM BA	BA	878,396	$190.1m0.50%	0.50%	Reduced -43.7k	-43,706 -4.7%
49	DANAHER CORPORATION COM DHR	DHR	971,095	$185.0m0.48%	0.48%	Reduced -325.7k	-325,709 -25.1%
50	CINTAS CORP COM CTAS	CTAS	1,063,530	$180.9m0.47%	0.47%	Added +90.0k	+89,977 9.2%
51	VANGUARD SPECIALIZED FUNDS DIV APP ETF VIG	VIG	718,567	$170.0m0.44%	0.44%	Added +30.8k	+30,796 4.5%
52	QUANTA SVCS INC COM PWR	PWR	224,665	$161.8m0.42%	0.42%	Reduced -1.2k	-1,185 -0.5%
53	INTUITIVE SURGICAL INC COM NEW ISRG	ISRG	397,640	$158.1m0.41%	0.41%	Reduced -27.6k	-27,588 -6.5%
54	MARVELL TECHNOLOGY INC COM MRVL	MRVL	530,549	$158.0m0.41%	0.41%	Reduced -193.4k	-193,427 -26.7%
55	INTERCONTINENTAL EXCHANGE IN COM ICE	ICE	1,283,754	$158.0m0.41%	0.41%	Reduced -309.9k	-309,874 -19.4%
56	GOLDMAN SACHS GROUP INC COM GS	GS	147,217	$148.9m0.39%	0.39%	Reduced -9.0k	-9,048 -5.8%
57	CURTISS WRIGHT CORP COM CW	CW	185,609	$140.6m0.37%	0.37%	Added +18.6k	+18,582 11.1%
58	ROCKWELL AUTOMATION INC COM ROK	ROK	282,332	$139.8m0.36%	0.36%	Reduced -1.7k	-1,735 -0.6%
59	RBC BEARINGS INC COM RBC	RBC	215,880	$139.0m0.36%	0.36%	Reduced -2.0k	-1,953 -0.9%
60	INTERNATIONAL BUSINESS MACHS COM IBM	IBM	486,008	$136.7m0.36%	0.36%	Reduced -32.4k	-32,449 -6.3%
61	ADVANCED MICRO DEVICES INC COM AMD	AMD	235,214	$136.6m0.36%	0.36%	Added +33.3k	+33,266 16.5%
62	SPDR GOLD TR GOLD SHS GLD	GLD	362,632	$133.6m0.35%	0.35%	Reduced -24.1k	-24,103 -6.2%
63	VEEVA SYS INC CL A COM VEEV	VEEV	750,843	$133.3m0.35%	0.35%	Reduced -316.7k	-316,733 -29.7%
64	UNION PAC CORP COM UNP	UNP	487,778	$132.7m0.35%	0.35%	Reduced -27.1k	-27,051 -5.2%
65	VANGUARD INDEX FDS GROWTH ETF VUG	VUG	1,526,650	$131.5m0.34%	0.34%	Added +24.1k	+24,070 1.6%
66	ISHARES TR CORE S&P US VLU IUSV	IUSV	1,189,639	$131.0m0.34%	0.34%	Added +23.7k	+23,687 2.0%
67	PROCTER AND GAMBLE CO COM PG	PG	888,116	$130.2m0.34%	0.34%	Reduced -5.8k	-5,817 -0.7%
68	CATERPILLAR INC COM CAT	CAT	121,522	$129.4m0.34%	0.34%	Added +3.0k	+3,021 2.5%
69	HEICO CORP NEW COM HEI	HEI	357,664	$127.4m0.33%	0.33%	Added +20.9k	+20,865 6.2%
70	ISHARES TR RUS 1000 GRW ETF IWF	IWF	973,601	$120.9m0.31%	0.31%	Reduced -90.5k	-90,503 -8.5%
71	LINDE PLC SHS LIN	LIN	232,315	$120.6m0.31%	0.31%	Reduced -867	-867 -0.4%
72	CHEVRON CORP NEW COM CVX	CVX	727,136	$120.5m0.31%	0.31%	Added +11.2k	+11,150 1.6%
73	AON PLC SHS CL A AON	AON	360,607	$119.6m0.31%	0.31%	Reduced -61.0k	-60,998 -14.5%
74	BLACKSTONE INC COM BX	BX	1,011,005	$119.0m0.31%	0.31%	Reduced -167.6k	-167,607 -14.2%
75	MERCK & CO INC COM MRK	MRK	920,715	$118.3m0.31%	0.31%	Added +18.9k	+18,926 2.1%
76	FIRST TR EXCHANGE TRADED FD RISNG DIVD ACHIV RDVY	RDVY	1,431,021	$116.0m0.30%	0.30%	Added +550.2k	+550,198 62.5%
77	LIVE NATION ENTERTAINMENT IN COM LYV	LYV	628,014	$115.0m0.30%	0.30%	Reduced -34.1k	-34,067 -5.2%
78	TESLA INC COM TSLA	TSLA	273,193	$114.9m0.30%	0.30%	Reduced -22.8k	-22,848 -7.7%
79	COCA COLA CO COM KO	KO	1,397,145	$113.5m0.30%	0.30%	Reduced -18.6k	-18,590 -1.3%
80	DEXCOM INC COM DXCM	DXCM	1,665,665	$112.2m0.29%	0.29%	Reduced -261.7k	-261,722 -13.6%
81	WASTE MGMT INC DEL COM WM	WM	491,328	$109.5m0.29%	0.29%	Added +7.0k	+7,025 1.4%
82	AMETEK INC COM AME	AME	436,176	$105.5m0.27%	0.27%	Reduced -21.3k	-21,271 -4.7%
83	JONES LANG LASALLE INC COM JLL	JLL	340,350	$105.5m0.27%	0.27%	Added +2.9k	+2,933 0.9%
84	ISHARES TR MSCI EAFE ETF EFA	EFA	994,809	$103.3m0.27%	0.27%	Added +36.0k	+36,004 3.8%
85	HONEYWELL INTL INC COM HON	HON	454,384	$101.7m0.27%	0.27%	New
86	CISCO SYS INC COM CSCO	CSCO	857,629	$100.7m0.26%	0.26%	Added +33.8k	+33,828 4.1%
87	HONEYWELL AEROSPACE INC COM HONA	HONA	454,071	$100.4m0.26%	0.26%	New
88	GENERAL DYNAMICS CORP COM GD	GD	278,892	$98.8m0.26%	0.26%	Reduced -13.1k	-13,143 -4.5%
89	OREILLY AUTOMOTIVE INC COM ORLY	ORLY	1,054,007	$97.1m0.25%	0.25%	Reduced -50.4k	-50,393 -4.6%
90	ILLINOIS TOOL WKS INC COM ITW	ITW	358,826	$97.1m0.25%	0.25%	Reduced -1.5k	-1,494 -0.4%
91	DEERE & CO COM DE	DE	152,753	$96.9m0.25%	0.25%	Added +5.1k	+5,130 3.5%
92	STARBUCKS CORP COM SBUX	SBUX	945,888	$96.7m0.25%	0.25%	Added +7.3k	+7,340 0.8%
93	ABBOTT LABS COM ABT	ABT	1,063,211	$96.5m0.25%	0.25%	Reduced -264.6k	-264,550 -19.9%
94	GENERAC HLDGS INC COM GNRC	GNRC	325,426	$95.3m0.25%	0.25%	Reduced -21.4k	-21,404 -6.2%
95	ISHARES TR CORE S&P US GWT IUSG	IUSG	501,346	$94.3m0.25%	0.25%	Added +23.1k	+23,068 4.8%
96	MCDONALDS CORP COM MCD	MCD	340,138	$91.9m0.24%	0.24%	Reduced -8.1k	-8,105 -2.3%
97	NETFLIX INC COM NFLX	NFLX	1,285,481	$91.8m0.24%	0.24%	Reduced -478.0k	-477,970 -27.1%
98	TAIWAN SEMICONDUCTOR MFG LTD SPONSORED ADS TSM	TSM	191,662	$91.5m0.24%	0.24%	Added +53.9k	+53,907 39.1%
99	ISHARES TR CORE S&P TTL STK ITOT	ITOT	556,582	$91.4m0.24%	0.24%	Reduced -20.9k	-20,914 -3.6%
100	GUIDEWIRE SOFTWARE INC COM GWRE	GWRE	726,387	$89.4m0.23%	0.23%	Reduced -248.9k	-248,909 -25.5%

Sold out since Q1 2026

Security	Ticker	Shares held before	Value then
EXXON MOBIL CORP XOM	XOM	946,386	$160.6m946.4k shares
HONEYWELL INTL INC		147,916	$66.9m147.9k shares
HURON CONSULTING GROUP INC HURN	HURN	51,446	$6.6m51.4k shares
PRESTIGE CONSMR HEALTHCARE I PBH	PBH	106,485	$6.3m106.5k shares
DUPONT DE NEMOURS INC DWDP	DWDP	25,251	$3.5m25.3k shares
EXPONENT INC EXPO	EXPO	28,806	$1.9m28.8k shares
CLEARWATER ANALYTICS HLDGS I		77,582	$1.8m77.6k shares
RLI CORP RLI	RLI	31,573	$1.8m31.6k shares
ISHARES INC EIS	EIS	15,076	$1.7m15.1k shares
OSI SYSTEMS INC OSIS	OSIS	5,493	$1.5m5.5k shares
FLUSHING FINL CORP		78,721	$1.2m78.7k shares
COTERRA ENERGY INC CTRA	CTRA	22,748	$799.4k22.7k shares
ALIGNMENT HEALTHCARE INC ALHC	ALHC	42,450	$748.0k42.5k shares
CARNIVAL CORP		21,718	$562.1k21.7k shares
ALARM COM HLDGS INC ALRM	ALRM	12,066	$521.1k12.1k shares
RYANAIR HOLDINGS PLC RYAAY	RYAAY	8,686	$502.1k8.7k shares
FIRSTCASH HOLDINGS INC FCFS	FCFS	2,589	$486.7k2.6k shares
ELANCO ANIMAL HEALTH INC ELAN	ELAN	18,165	$434.7k18.2k shares
TERNS PHARMACEUTICALS INC		7,947	$419.0k7.9k shares
GATX CORP GATX	GATX	2,395	$408.9k2.4k shares
BLACKLINE INC BL	BL	10,573	$391.2k10.6k shares
BANK NOVA SCOTIA HALIFAX BNS	BNS	4,921	$341.1k4.9k shares
PLEXUS CORP PLXS	PLXS	1,646	$333.4k1.6k shares
OVINTIV INC OVV	OVV	5,506	$326.8k5.5k shares
SOCIEDAD QUIMICA Y MINERA DE SQM	SQM	4,006	$324.2k4.0k shares

Stakes above 5%

Companies where this manager has reported owning more than 5% of a class of shares, on Schedule 13D (may seek influence) or 13G (passive): its latest filing for each, from 19 Dec 2024 on.

Company	Ticker	Stake	Change	Schedule	Last filed
AIRGAIN INC AIRG · 13G · filed 2025-11-14	AIRG	6.0%≈ $4.5m		13G	2025-11-14