BLAIR WILLIAM & CO/IL

CHICAGO, IL · CIK 902367 · 13F filing filed 2025-07-24

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)

$36.0bn reported value +8.6% vs Q1 2025

1,824positions

24.9%in top 10

113 new 661 added 756 reduced 90 sold out vs Q1 2025

Holdings, Q2 2025

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	MICROSOFT CORP COM MSFT	MSFT	3,696,704	$1.8bn5.11%	5.11%	Reduced -69.5k	-69,498 -1.9%
2	AMAZON COM INC COM AMZN	AMZN	6,121,875	$1.3bn3.73%	3.73%	Reduced -29.0k	-28,981 -0.5%
3	APPLE INC COM AAPL	AAPL	6,026,880	$1.2bn3.43%	3.43%	Reduced -147.4k	-147,390 -2.4%
4	NVIDIA CORPORATION COM NVDA	NVDA	5,599,138	$884.6m2.46%	2.46%	Added +218.6k	+218,564 4.1%
5	VISA INC COM CL A V	V	2,071,053	$735.3m2.04%	2.04%	Added +34.3k	+34,297 1.7%
6	JPMORGAN CHASE & CO COM JPM	JPM	2,329,745	$675.4m1.88%	1.88%	Added +10.6k	+10,609 0.5%
7	IDEXX LABS INC COM IDXX	IDXX	1,080,505	$579.5m1.61%	1.61%	Reduced -10.3k	-10,265 -0.9%
8	MASTERCARD INCORPORATED CL A MA	MA	1,007,323	$566.1m1.57%	1.57%	Reduced -13.4k	-13,372 -1.3%
9	ALPHABET INC CAP STK CL C GOOG	GOOG	3,180,029	$564.1m1.57%	1.57%	Reduced -35.6k	-35,649 -1.1%
10	COSTCO WHSL CORP NEW COM COST	COST	551,986	$546.4m1.52%	1.52%	Added +3.1k	+3,087 0.6%
11	SPDR S&P 500 ETF TR TR UNIT SPY	SPY	859,665	$531.1m1.48%	1.48%	Added +5.3k	+5,282 0.6%
12	ALPHABET INC CAP STK CL A GOOGL	GOOGL	2,525,136	$445.0m1.24%	1.24%	Reduced -59.1k	-59,067 -2.3%
13	META PLATFORMS INC CL A META	META	576,598	$425.6m1.18%	1.18%	Added +25.4k	+25,440 4.6%
14	UBER TECHNOLOGIES INC COM UBER	UBER	4,324,033	$403.4m1.12%	1.12%	Added +75.2k	+75,224 1.8%
15	PROGRESSIVE CORP COM PGR	PGR	1,505,421	$401.7m1.12%	1.12%	Reduced -17.6k	-17,637 -1.2%
16	VEEVA SYS INC CL A COM VEEV	VEEV	1,284,962	$370.0m1.03%	1.03%	Reduced -14.0k	-13,959 -1.1%
17	STRYKER CORPORATION COM SYK	SYK	924,257	$365.7m1.02%	1.02%	Reduced -2.1k	-2,118 -0.2%
18	FISERV INC COM FISV	FISV	2,107,519	$363.4m1.01%	1.01%	Added +117.5k	+117,508 5.9%
19	WATSCO INC COM WSO	WSO	806,656	$356.2m0.99%	0.99%	Reduced -8.1k	-8,056 -1.0%
20	SERVICENOW INC COM NOW	NOW	327,788	$337.0m0.94%	0.94%	Added +1.7k	+1,677 0.5%
21	GE VERNOVA INC COM GEV	GEV	632,806	$334.8m0.93%	0.93%	Added +279.6k	+279,604 79.2%
22	INTERCONTINENTAL EXCHANGE IN COM ICE	ICE	1,752,889	$321.6m0.89%	0.89%	Reduced -21.4k	-21,406 -1.2%
23	AMPHENOL CORP CL A APH	APH	2,971,448	$293.4m0.82%	0.82%	Reduced -55.9k	-55,902 -1.9%
24	FASTENAL CO COM FAST	FAST	6,822,973	$286.6m0.80%	0.80%	Added +237.7k	+237,705 3.6%
25	HOME DEPOT INC COM HD	HD	759,360	$278.4m0.77%	0.77%	Reduced -2.5k	-2,549 -0.3%
26	GUIDEWIRE SOFTWARE INC COM GWRE	GWRE	1,174,625	$276.6m0.77%	0.77%	Reduced -5.3k	-5,253 -0.5%
27	DANAHER CORPORATION COM DHR	DHR	1,375,724	$271.8m0.75%	0.75%	Reduced -68.1k	-68,056 -4.7%
28	ISHARES TR CORE S&P500 ETF IVV	IVV	436,143	$270.8m0.75%	0.75%	Added +18.9k	+18,914 4.5%
29	TRANSDIGM GROUP INC COM TDG	TDG	172,953	$263.0m0.73%	0.73%	Reduced -2.3k	-2,268 -1.3%
30	BROADCOM INC COM AVGO	AVGO	934,447	$257.6m0.72%	0.72%	Added +69.0k	+69,027 8.0%
31	WORKDAY INC CL A WDAY	WDAY	1,067,119	$256.1m0.71%	0.71%	Reduced -43.5k	-43,471 -3.9%
32	ZOETIS INC CL A ZTS	ZTS	1,631,871	$254.5m0.71%	0.71%	Reduced -260.4k	-260,409 -13.8%
33	INTUITIVE SURGICAL INC COM NEW ISRG	ISRG	466,023	$253.2m0.70%	0.70%	Reduced -7.4k	-7,393 -1.6%
34	TYLER TECHNOLOGIES INC COM TYL	TYL	424,768	$251.8m0.70%	0.70%	Added +3.9k	+3,894 0.9%
35	COPART INC COM CPRT	CPRT	5,082,291	$249.4m0.69%	0.69%	Reduced -70.3k	-70,297 -1.4%
36	WALMART INC COM WMT	WMT	2,435,014	$238.1m0.66%	0.66%	Reduced -9.5k	-9,471 -0.4%
37	ELI LILLY & CO COM LLY	LLY	304,467	$237.3m0.66%	0.66%	Reduced -27.4k	-27,354 -8.2%
38	PALO ALTO NETWORKS INC COM PANW	PANW	1,157,886	$236.9m0.66%	0.66%	Reduced -20.8k	-20,762 -1.8%
39	ABBVIE INC COM ABBV	ABBV	1,257,412	$233.4m0.65%	0.65%	Added +14.3k	+14,307 1.1%
40	COSTAR GROUP INC COM CSGP	CSGP	2,871,162	$230.8m0.64%	0.64%	Reduced -32.4k	-32,356 -1.1%
41	CINTAS CORP COM CTAS	CTAS	1,014,575	$226.1m0.63%	0.63%	Added +16.0k	+15,972 1.6%
42	ADOBE INC COM ADBE	ADBE	565,371	$218.7m0.61%	0.61%	Reduced -38.6k	-38,554 -6.4%
43	ABBOTT LABS COM ABT	ABT	1,603,305	$218.1m0.61%	0.61%	Added +24.3k	+24,281 1.5%
44	ECOLAB INC COM ECL	ECL	805,156	$216.9m0.60%	0.60%	Reduced -9.0k	-8,977 -1.1%
45	AMERICAN EXPRESS CO COM AXP	AXP	678,570	$216.5m0.60%	0.60%	Reduced -11.0k	-10,978 -1.6%
46	BERKSHIRE HATHAWAY INC DEL CL B NEW BRK.B	BRK.B	442,597	$215.0m0.60%	0.60%	Added +21.8k	+21,843 5.2%
47	BLACKSTONE INC COM BX	BX	1,355,932	$202.8m0.56%	0.56%	Added +10.0k	+10,013 0.7%
48	AON PLC SHS CL A AON	AON	567,987	$202.6m0.56%	0.56%	Added +13.2k	+13,237 2.4%
49	NETFLIX INC COM NFLX	NFLX	150,255	$201.2m0.56%	0.56%	Added +12.8k	+12,824 9.3%
50	INTUIT COM INTU	INTU	255,338	$201.1m0.56%	0.56%	Reduced -367	-367 -0.1%
51	DEXCOM INC COM DXCM	DXCM	2,208,044	$192.7m0.54%	0.54%	Reduced -30.5k	-30,519 -1.4%
52	RYAN SPECIALTY HOLDINGS INC CL A RYAN	RYAN	2,814,195	$191.3m0.53%	0.53%	Added +29.3k	+29,279 1.1%
53	PURE STORAGE INC CL A P	P	3,124,542	$179.9m0.50%	0.50%	Reduced -416.9k	-416,903 -11.8%
54	SALESFORCE INC COM CRM	CRM	655,587	$178.8m0.50%	0.50%	Reduced -24.6k	-24,592 -3.6%
55	ACCENTURE PLC IRELAND SHS CLASS A ACN	ACN	587,570	$175.6m0.49%	0.49%	Reduced -133.9k	-133,923 -18.6%
56	VANGUARD INDEX FDS S&P 500 ETF SHS VOO	VOO	303,780	$172.6m0.48%	0.48%	Added +12.5k	+12,469 4.3%
57	AMERICAN TOWER CORP NEW COM AMT	AMT	773,174	$170.9m0.47%	0.47%	Reduced -4.0k	-4,015 -0.5%
58	VANGUARD TAX-MANAGED FDS VAN FTSE DEV MKT VEA	VEA	2,956,837	$168.6m0.47%	0.47%	Reduced -14.4k	-14,416 -0.5%
59	AAON INC COM PAR $0.004 AAON	AAON	2,280,070	$168.2m0.47%	0.47%	Added +102.4k	+102,382 4.7%
60	PROCTER AND GAMBLE CO COM PG	PG	980,263	$156.2m0.43%	0.43%	Reduced -9.9k	-9,917 -1.0%
61	INVESCO QQQ TR UNIT SER 1 QQQ	QQQ	270,387	$149.2m0.41%	0.41%	Added +13.8k	+13,795 5.4%
62	VANGUARD INDEX FDS VALUE ETF VTV	VTV	823,862	$145.6m0.40%	0.40%	Added +58.1k	+58,110 7.6%
63	JOHNSON & JOHNSON COM JNJ	JNJ	952,857	$145.5m0.40%	0.40%	Reduced -4.8k	-4,804 -0.5%
64	BWX TECHNOLOGIES INC COM BWXT	BWXT	1,003,607	$144.6m0.40%	0.40%	Added +220.6k	+220,616 28.2%
65	INTERNATIONAL BUSINESS MACHS COM IBM	IBM	475,623	$140.2m0.39%	0.39%	Added +14.8k	+14,771 3.2%
66	VANGUARD INTL EQUITY INDEX F ALLWRLD EX US VEU	VEU	2,055,577	$138.2m0.38%	0.38%	Added +54.0k	+54,001 2.7%
67	BOEING CO COM BA	BA	658,055	$137.9m0.38%	0.38%	Added +180.2k	+180,247 37.7%
68	VANGUARD SPECIALIZED FUNDS DIV APP ETF VIG	VIG	635,523	$130.1m0.36%	0.36%	Reduced -6.4k	-6,358 -1.0%
69	CHIPOTLE MEXICAN GRILL INC COM CMG	CMG	2,311,580	$129.8m0.36%	0.36%	Reduced -135.0k	-135,016 -5.5%
70	AMETEK INC COM AME	AME	689,860	$124.8m0.35%	0.35%	Reduced -15.3k	-15,277 -2.2%
71	ROLLINS INC COM ROL	ROL	2,170,212	$122.4m0.34%	0.34%	Reduced -2.9k	-2,871 -0.1%
72	POOL CORP COM POOL	POOL	409,738	$119.4m0.33%	0.33%	Reduced -107.7k	-107,711 -20.8%
73	VERISK ANALYTICS INC COM VRSK	VRSK	383,297	$119.4m0.33%	0.33%	Reduced -301	-301 -0.1%
74	ARISTA NETWORKS INC COM SHS ANET	ANET	1,157,382	$118.4m0.33%	0.33%	Added +125.4k	+125,362 12.2%
75	UNION PAC CORP COM UNP	UNP	497,859	$114.5m0.32%	0.32%	Reduced -19.5k	-19,538 -3.8%
76	IRHYTHM TECHNOLOGIES INC COM IRTC	IRTC	739,331	$113.8m0.32%	0.32%	Reduced -50.7k	-50,668 -6.4%
77	ORACLE CORP COM ORCL	ORCL	519,237	$113.5m0.32%	0.32%	Added +19.5k	+19,470 3.9%
78	LINDE PLC SHS LIN	LIN	239,971	$112.6m0.31%	0.31%	Reduced -2.0k	-2,036 -0.8%
79	COCA COLA CO COM KO	KO	1,549,871	$109.7m0.30%	0.30%	Added +2.1k	+2,068 0.1%
80	S&P GLOBAL INC COM SPGI	SPGI	205,995	$108.6m0.30%	0.30%	Added +119	+119 0.1%
81	ISHARES TR RUSSELL 2000 ETF IWM	IWM	493,580	$106.5m0.30%	0.30%	Reduced -24.9k	-24,873 -4.8%
82	LIVE NATION ENTERTAINMENT IN COM LYV	LYV	702,111	$106.2m0.30%	0.30%	Reduced -24.8k	-24,833 -3.4%
83	GOLDMAN SACHS GROUP INC COM GS	GS	150,016	$106.2m0.29%	0.29%	Reduced -8.4k	-8,356 -5.3%
84	ISHARES TR RUS 1000 GRW ETF IWF	IWF	249,093	$105.8m0.29%	0.29%	Added +28.5k	+28,470 12.9%
85	EXXON MOBIL CORP COM XOM	XOM	971,001	$104.7m0.29%	0.29%	Added +11.1k	+11,127 1.2%
86	ILLINOIS TOOL WKS INC COM ITW	ITW	421,557	$104.2m0.29%	0.29%	Reduced -23.3k	-23,295 -5.2%
87	STARBUCKS CORP COM SBUX	SBUX	1,093,892	$100.2m0.28%	0.28%	Reduced -126.0k	-126,023 -10.3%
88	MCDONALDS CORP COM MCD	MCD	342,182	$100.0m0.28%	0.28%	Added +1.1k	+1,135 0.3%
89	ISHARES TR CORE S&P US VLU IUSV	IUSV	1,049,440	$99.3m0.28%	0.28%	Reduced -88.8k	-88,757 -7.8%
90	OREILLY AUTOMOTIVE INC COM ORLY	ORLY	1,079,612	$97.3m0.27%	0.27%	Reduced -16.2k	-16,183 -1.5%
91	CHEVRON CORP NEW COM CVX	CVX	652,914	$93.5m0.26%	0.26%	Reduced -3.5k	-3,514 -0.5%
92	WASTE MGMT INC DEL COM WM	WM	403,716	$92.4m0.26%	0.26%	Added +99.9k	+99,943 32.9%
93	ROCKWELL AUTOMATION INC COM ROK	ROK	276,929	$92.0m0.26%	0.26%	Reduced -12.4k	-12,437 -4.3%
94	TESLA INC COM TSLA	TSLA	283,552	$90.1m0.25%	0.25%	Added +27.9k	+27,874 10.9%
95	CROWDSTRIKE HLDGS INC CL A CRWD	CRWD	174,803	$89.0m0.25%	0.25%	Added +15.3k	+15,259 9.6%
96	CLEARWATER ANALYTICS HLDGS I CL A CL A		3,888,661	$85.3m0.24%	0.24%	Added +1.4m	+1,354,391 53.4%
97	VANGUARD INDEX FDS GROWTH ETF VUG	VUG	189,300	$83.0m0.23%	0.23%	Reduced -2.2k	-2,235 -1.2%
98	RB GLOBAL INC COM RBA	RBA	778,279	$82.6m0.23%	0.23%	Reduced -29.2k	-29,154 -3.6%
99	VANGUARD INDEX FDS TOTAL STK MKT VTI	VTI	270,338	$82.2m0.23%	0.23%	Added +5.9k	+5,931 2.2%
100	GENERAL DYNAMICS CORP COM GD	GD	279,576	$81.5m0.23%	0.23%	Reduced -11.0k	-10,991 -3.8%

Sold out since Q1 2025

Security	Ticker	Shares held before	Value then
DISCOVER FINL SVCS DFS	DFS	30,537	$5.2m30.5k shares
ROCKET LAB USA INC		187,973	$3.4m188.0k shares
NCR VOYIX CORPORATION VYX	VYX	81,215	$2.6m81.2k shares
BARRICK GOLD CORP		114,163	$2.2m114.2k shares
AGCO CORP AGCO	AGCO	21,918	$2.0m21.9k shares
UNITED STATES STL CORP NEW X	X	47,207	$2.0m47.2k shares
VIGIL NEUROSCIENCE INC VIGL	VIGL	1,033,577	$1.8m1.0m shares
BRC INC		792,460	$1.7m792.5k shares
ANSYS INC ANSS	ANSS	3,504	$1.1m3.5k shares
HESS CORP HES	HES	6,816	$1.1m6.8k shares
SAP SE SAP	SAP	3,833	$1.0m3.8k shares
PINTEREST INC PINS	PINS	28,551	$885.1k28.6k shares
ICF INTL INC ICFI	ICFI	9,796	$832.4k9.8k shares
FIRST LONG IS CORP FLIC	FLIC	64,809	$800.4k64.8k shares
GRAPHIC PACKAGING HLDG CO GPK	GPK	30,229	$784.7k30.2k shares
LIONS GATE ENTMNT CORP		95,900	$759.5k95.9k shares
REDFIN CORP RDFN	RDFN	76,288	$702.6k76.3k shares
PENN ENTERTAINMENT INC PENN	PENN	42,229	$688.8k42.2k shares
AZEK CO INC AZEK	AZEK	12,917	$631.5k12.9k shares
TARSUS PHARMACEUTICALS INC TARS	TARS	11,416	$586.4k11.4k shares
AMERICAN AIRLS GROUP INC AAL	AAL	54,675	$576.8k54.7k shares
INTERPUBLIC GROUP COS INC IPG	IPG	21,226	$576.5k21.2k shares
SENSATA TECHNOLOGIES HLDG PL ST	ST	19,927	$483.6k19.9k shares
ULTRA CLEAN HLDGS INC UCTT	UCTT	22,100	$473.2k22.1k shares
TOPGOLF CALLAWAY BRANDS CORP CALY	CALY	65,595	$432.3k65.6k 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