BLAIR WILLIAM & CO/IL

CHICAGO, IL · CIK 902367 · 13F filing filed 2024-08-12

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)

$32.4bn reported value +1.8% vs Q1 2024

1,822positions

24.5%in top 10

108 new 718 added 746 reduced 73 sold out vs Q1 2024

Holdings, Q2 2024

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	3,788,765	$1.7bn5.22%	5.22%	Added +124.1k	+124,105 3.4%
2	APPLE INC COM AAPL	AAPL	6,407,746	$1.3bn4.16%	4.16%	Added +310.6k	+310,626 5.1%
3	AMAZON COM INC COM AMZN	AMZN	6,073,517	$1.2bn3.62%	3.62%	Added +127.1k	+127,076 2.1%
4	ALPHABET INC CAP STK CL C GOOG	GOOG	3,458,380	$634.3m1.96%	1.96%	Reduced -5.7k	-5,686 -0.2%
5	VISA INC COM CL A V	V	2,184,658	$573.4m1.77%	1.77%	Reduced -8.7k	-8,741 -0.4%
6	IDEXX LABS INC COM IDXX	IDXX	1,173,058	$571.5m1.76%	1.76%	Reduced -16.1k	-16,086 -1.4%
7	ALPHABET INC CAP STK CL A GOOGL	GOOGL	2,686,056	$489.3m1.51%	1.51%	Added +151.6k	+151,589 6.0%
8	DEXCOM INC COM DXCM	DXCM	4,299,419	$487.5m1.50%	1.50%	Reduced -233.3k	-233,268 -5.2%
9	JPMORGAN CHASE & CO COM JPM	JPM	2,405,699	$486.6m1.50%	1.50%	Added +187.2k	+187,177 8.4%
10	NVIDIA CORPORATION COM NVDA	NVDA	3,913,259	$483.4m1.49%	1.49%	Added +76.4k	+76,439 2.0%
11	COSTCO WHSL CORP NEW COM COST	COST	568,653	$483.3m1.49%	1.49%	Reduced -1.1k	-1,110 -0.2%
12	MASTERCARD INCORPORATED CL A MA	MA	1,046,742	$461.8m1.42%	1.42%	Added +120	+120 0.0%
13	DANAHER CORPORATION COM DHR	DHR	1,777,030	$444.0m1.37%	1.37%	Added +15.8k	+15,766 0.9%
14	SPDR S&P 500 ETF TR TR UNIT SPY	SPY	773,276	$420.8m1.30%	1.30%	Added +39.0k	+38,961 5.3%
15	ZOETIS INC CL A ZTS	ZTS	2,366,758	$410.3m1.27%	1.27%	Reduced -66.3k	-66,276 -2.7%
16	ADOBE INC COM ADBE	ADBE	677,819	$376.6m1.16%	1.16%	Added +556	+556 0.1%
17	WATSCO INC COM WSO	WSO	801,152	$371.1m1.14%	1.14%	Added +9.1k	+9,141 1.1%
18	COSTAR GROUP INC COM CSGP	CSGP	4,397,738	$326.0m1.01%	1.01%	Reduced -22.0k	-22,040 -0.5%
19	FISERV INC COM FISV	FISV	2,171,391	$323.6m1.00%	1.00%	Added +52.7k	+52,748 2.5%
20	PROGRESSIVE CORP COM PGR	PGR	1,529,521	$317.7m0.98%	0.98%	Reduced -38.7k	-38,677 -2.5%
21	STRYKER CORPORATION COM SYK	SYK	927,910	$315.7m0.97%	0.97%	Added +1.3k	+1,332 0.1%
22	ELI LILLY & CO COM LLY	LLY	346,588	$313.8m0.97%	0.97%	Added +15.1k	+15,133 4.6%
23	UBER TECHNOLOGIES INC COM UBER	UBER	4,007,708	$291.3m0.90%	0.90%	Added +797.1k	+797,124 24.8%
24	COPART INC COM CPRT	CPRT	5,241,560	$283.9m0.88%	0.88%	Added +6.3k	+6,296 0.1%
25	WORKDAY INC CL A WDAY	WDAY	1,256,416	$280.9m0.87%	0.87%	Reduced -281.6k	-281,594 -18.3%
26	INTUIT COM INTU	INTU	424,905	$279.3m0.86%	0.86%	Reduced -4.0k	-4,050 -0.9%
27	POOL CORP COM POOL	POOL	854,709	$262.7m0.81%	0.81%	Added +11.1k	+11,059 1.3%
28	INTERCONTINENTAL EXCHANGE IN COM ICE	ICE	1,855,373	$254.0m0.78%	0.78%	Reduced -11.4k	-11,403 -0.6%
29	HOME DEPOT INC COM HD	HD	729,947	$251.3m0.78%	0.78%	Added +18.0k	+18,039 2.5%
30	VEEVA SYS INC CL A COM VEEV	VEEV	1,351,717	$247.4m0.76%	0.76%	Reduced -107.4k	-107,381 -7.4%
31	SERVICENOW INC COM NOW	NOW	305,389	$240.2m0.74%	0.74%	Added +4.3k	+4,287 1.4%
32	TYLER TECHNOLOGIES INC COM TYL	TYL	460,712	$231.6m0.71%	0.71%	Reduced -2.9k	-2,900 -0.6%
33	TRANSDIGM GROUP INC COM TDG	TDG	177,384	$226.6m0.70%	0.70%	Added +188	+188 0.1%
34	PALO ALTO NETWORKS INC COM PANW	PANW	626,801	$212.5m0.66%	0.66%	Added +3.3k	+3,341 0.5%
35	AMPHENOL CORP CL A APH	APH	3,132,484	$211.0m0.65%	0.65%	Added +59.7k	+59,736 1.9%
36	ECOLAB INC COM ECL	ECL	886,350	$211.0m0.65%	0.65%	Reduced -13.7k	-13,652 -1.5%
37	INTUITIVE SURGICAL INC COM NEW ISRG	ISRG	472,242	$210.1m0.65%	0.65%	Added +23.7k	+23,667 5.3%
38	ISHARES TR CORE S&P500 ETF IVV	IVV	380,392	$208.2m0.64%	0.64%	Added +13.7k	+13,701 3.7%
39	FASTENAL CO COM FAST	FAST	3,253,467	$204.4m0.63%	0.63%	Reduced -21.4k	-21,365 -0.7%
40	SALESFORCE INC COM CRM	CRM	779,666	$200.5m0.62%	0.62%	Reduced -27.5k	-27,537 -3.4%
41	ABBVIE INC COM ABBV	ABBV	1,166,215	$200.0m0.62%	0.62%	Added +28.3k	+28,273 2.5%
42	UNITEDHEALTH GROUP INC COM UNH	UNH	389,740	$198.5m0.61%	0.61%	Added +6.9k	+6,912 1.8%
43	ACCENTURE PLC IRELAND SHS CLASS A ACN	ACN	637,853	$193.5m0.60%	0.60%	Added +3.3k	+3,349 0.5%
44	CINTAS CORP COM CTAS	CTAS	260,480	$182.4m0.56%	0.56%	Reduced -9.3k	-9,290 -3.4%
45	ABBOTT LABS COM ABT	ABT	1,747,920	$181.6m0.56%	0.56%	Reduced -26.3k	-26,316 -1.5%
46	AON PLC SHS CL A AON	AON	602,517	$176.9m0.55%	0.55%	Reduced -8.6k	-8,648 -1.4%
47	GUIDEWIRE SOFTWARE INC COM GWRE	GWRE	1,260,931	$173.9m0.54%	0.54%	Added +16.5k	+16,515 1.3%
48	WALMART INC COM WMT	WMT	2,527,952	$171.2m0.53%	0.53%	Added +29.9k	+29,857 1.2%
49	AMERICAN EXPRESS CO COM AXP	AXP	738,499	$171.0m0.53%	0.53%	Added +9.1k	+9,097 1.2%
50	META PLATFORMS INC CL A META	META	331,266	$167.0m0.52%	0.52%	Added +19.9k	+19,899 6.4%
51	RYAN SPECIALTY HOLDINGS INC CL A RYAN	RYAN	2,866,003	$166.0m0.51%	0.51%	Added +94.7k	+94,663 3.4%
52	BERKSHIRE HATHAWAY INC DEL CL B NEW BRK.B	BRK.B	406,304	$165.3m0.51%	0.51%	Added +10.6k	+10,605 2.7%
53	PROCTER AND GAMBLE CO COM PG	PG	988,657	$163.0m0.50%	0.50%	Added +60.5k	+60,471 6.5%
54	BLACKSTONE INC COM BX	BX	1,296,649	$160.5m0.50%	0.50%	Added +162.9k	+162,896 14.4%
55	VANGUARD TAX-MANAGED FDS VAN FTSE DEV MKT VEA	VEA	3,134,055	$154.9m0.48%	0.48%	Added +83.8k	+83,840 2.8%
56	JOHNSON & JOHNSON COM JNJ	JNJ	1,045,546	$152.8m0.47%	0.47%	Added +114.8k	+114,780 12.3%
57	PURE STORAGE INC CL A P	P	2,357,962	$151.4m0.47%	0.47%	Added +15.7k	+15,747 0.7%
58	AMERICAN TOWER CORP NEW COM AMT	AMT	774,615	$150.6m0.46%	0.46%	Added +13.3k	+13,258 1.7%
59	CHIPOTLE MEXICAN GRILL INC COM CMG	CMG	2,286,275	$143.2m0.44%	0.44%	Reduced -56.2k	-56,225 -2.4%
60	SCHWAB CHARLES CORP COM SCHW	SCHW	1,940,154	$143.0m0.44%	0.44%	Added +22.8k	+22,823 1.2%
61	STARBUCKS CORP COM SBUX	SBUX	1,795,866	$139.8m0.43%	0.43%	Reduced -360.8k	-360,845 -16.7%
62	UNION PAC CORP COM UNP	UNP	600,134	$135.8m0.42%	0.42%	Added +73.0k	+73,036 13.9%
63	MERCK & CO INC COM MRK	MRK	998,771	$123.6m0.38%	0.38%	Added +260.7k	+260,742 35.3%
64	AMETEK INC COM AME	AME	731,313	$121.9m0.38%	0.38%	Reduced -3.1k	-3,058 -0.4%
65	VANGUARD INTL EQUITY INDEX F ALLWRLD EX US VEU	VEU	2,060,284	$120.8m0.37%	0.37%	Added +26.9k	+26,926 1.3%
66	VANGUARD SPECIALIZED FUNDS DIV APP ETF VIG	VIG	661,082	$120.7m0.37%	0.37%	Reduced -13.0k	-12,987 -1.9%
67	VANGUARD INDEX FDS VALUE ETF VTV	VTV	731,716	$117.4m0.36%	0.36%	Added +29.8k	+29,820 4.2%
68	ROCKWELL AUTOMATION INC COM ROK	ROK	419,865	$115.6m0.36%	0.36%	Added +14.8k	+14,758 3.6%
69	LINDE PLC SHS LIN	LIN	260,353	$114.2m0.35%	0.35%	Reduced -2.4k	-2,429 -0.9%
70	VANGUARD INDEX FDS S&P 500 ETF SHS VOO	VOO	227,188	$113.6m0.35%	0.35%	Added +40.1k	+40,055 21.4%
71	EXXON MOBIL CORP COM XOM	XOM	967,618	$111.4m0.34%	0.34%	Added +379.7k	+379,747 64.6%
72	VERISK ANALYTICS INC COM VRSK	VRSK	407,825	$109.9m0.34%	0.34%	Added +177	+177 0.0%
73	INVESCO QQQ TR UNIT SER 1 QQQ	QQQ	225,762	$108.2m0.33%	0.33%	Added +13.5k	+13,465 6.3%
74	COCA COLA CO COM KO	KO	1,650,616	$105.1m0.32%	0.32%	Added +22.9k	+22,932 1.4%
75	BROADCOM INC COM AVGO	AVGO	65,338	$104.9m0.32%	0.32%	Added +7.3k	+7,343 12.7%
76	CHEVRON CORP NEW COM CVX	CVX	665,112	$104.0m0.32%	0.32%	Added +12.7k	+12,732 1.9%
77	CROWDSTRIKE HLDGS INC CL A CRWD	CRWD	271,007	$103.8m0.32%	0.32%	Added +33.6k	+33,604 14.2%
78	ISHARES TR CORE S&P US VLU IUSV	IUSV	1,171,005	$103.2m0.32%	0.32%	Added +3.6k	+3,637 0.3%
79	GENERAL DYNAMICS CORP COM GD	GD	348,825	$101.2m0.31%	0.31%	Added +27.0k	+26,977 8.4%
80	ILLINOIS TOOL WKS INC COM ITW	ITW	425,505	$100.8m0.31%	0.31%	Reduced -10.0k	-10,045 -2.3%
81	PEPSICO INC COM PEP	PEP	599,006	$98.8m0.30%	0.30%	Added +96.2k	+96,201 19.1%
82	ROLLINS INC COM ROL	ROL	1,962,011	$95.7m0.30%	0.30%	Reduced -81.0k	-81,003 -4.0%
83	MICROCHIP TECHNOLOGY INC. COM MCHP	MCHP	1,039,336	$95.1m0.29%	0.29%	Reduced -20.0k	-19,962 -1.9%
84	NETFLIX INC COM NFLX	NFLX	140,148	$94.6m0.29%	0.29%	Added +324	+324 0.2%
85	MCDONALDS CORP COM MCD	MCD	359,917	$91.7m0.28%	0.28%	Added +7.9k	+7,871 2.2%
86	ISHARES TR RUSSELL 2000 ETF IWM	IWM	447,405	$90.8m0.28%	0.28%	Added +12.1k	+12,066 2.8%
87	IRHYTHM TECHNOLOGIES INC COM IRTC	IRTC	799,080	$86.0m0.27%	0.27%	Reduced -33.9k	-33,854 -4.1%
88	TREX CO INC COM TREX	TREX	1,144,126	$84.8m0.26%	0.26%	Added +6.9k	+6,901 0.6%
89	S&P GLOBAL INC COM SPGI	SPGI	190,083	$84.8m0.26%	0.26%	Added +1.1k	+1,148 0.6%
90	MOTOROLA SOLUTIONS INC COM NEW MSI	MSI	217,608	$84.0m0.26%	0.26%	Reduced -2.9k	-2,880 -1.3%
91	THERMO FISHER SCIENTIFIC INC COM TMO	TMO	148,974	$82.4m0.25%	0.25%	Reduced -3.3k	-3,298 -2.2%
92	INTERNATIONAL BUSINESS MACHS COM IBM	IBM	473,267	$81.9m0.25%	0.25%	Added +76.5k	+76,516 19.3%
93	MONGODB INC CL A MDB	MDB	315,830	$78.9m0.24%	0.24%	Added +44.6k	+44,608 16.4%
94	LULULEMON ATHLETICA INC COM LULU	LULU	263,939	$78.8m0.24%	0.24%	Reduced -14.9k	-14,929 -5.3%
95	BOOZ ALLEN HAMILTON HLDG COR CL A BAH	BAH	510,530	$78.6m0.24%	0.24%	Added +54.2k	+54,170 11.9%
96	LIVE NATION ENTERTAINMENT IN COM LYV	LYV	831,714	$78.0m0.24%	0.24%	Reduced -55.7k	-55,667 -6.3%
97	OREILLY AUTOMOTIVE INC COM ORLY	ORLY	72,228	$76.3m0.24%	0.24%	Reduced -122	-122 -0.2%
98	ARISTA NETWORKS INC COM COM		216,042	$75.7m0.23%	0.23%	Added +7.9k	+7,922 3.8%
99	ORACLE CORP COM ORCL	ORCL	528,640	$74.6m0.23%	0.23%	Added +270.2k	+270,229 104.6%
100	QUALCOMM INC COM QCOM	QCOM	371,279	$74.0m0.23%	0.23%	Added +38.9k	+38,923 11.7%

Sold out since Q1 2024

Security	Ticker	Shares held before	Value then
PIONEER NAT RES CO PXD	PXD	152,551	$40.0m152.6k shares
FUSION PHARMACEUTICALS INC		779,202	$16.6m779.2k shares
KNIGHT-SWIFT TRANSN HLDGS IN KNX	KNX	80,219	$4.4m80.2k shares
CHEESECAKE FACTORY INC CAKE	CAKE	36,299	$1.3m36.3k shares
JPMORGAN CHASE & CO AMJ	AMJ	38,151	$1.1m38.2k shares
LABORATORY CORP AMER HLDGS		4,940	$1.1m4.9k shares
TOPBUILD CORP BLD	BLD	2,007	$884.5k2.0k shares
WESTROCK CO WRK	WRK	12,888	$637.3k12.9k shares
NEW YORK CMNTY BANCORP INC		179,402	$577.7k179.4k shares
HEALTHEQUITY INC HQY	HQY	6,566	$536.0k6.6k shares
PAYCOM SOFTWARE INC PAYC	PAYC	2,278	$453.3k2.3k shares
SHOALS TECHNOLOGIES GROUP IN SHLS	SHLS	37,909	$423.8k37.9k shares
OPEN TEXT CORP OTEX	OTEX	8,246	$320.2k8.2k shares
CEDAR FAIR L P		7,128	$298.7k7.1k shares
CRH PLC CRH	CRH	3,366	$290.4k3.4k shares
INTELLIA THERAPEUTICS INC NTLA	NTLA	10,307	$283.5k10.3k shares
SIGNET JEWELERS LIMITED SIG	SIG	2,648	$265.0k2.6k shares
DARLING INGREDIENTS INC DAR	DAR	5,696	$264.9k5.7k shares
CROCS INC CROX	CROX	1,824	$262.3k1.8k shares
AMBARELLA INC AMBA	AMBA	5,114	$259.6k5.1k shares
SENTINELONE INC S	S	11,032	$257.2k11.0k shares
RENTOKIL INITIAL PLC RTO	RTO	8,473	$255.5k8.5k shares
PATTERSON COS INC PDCO	PDCO	9,218	$254.9k9.2k shares
STMICROELECTRONICS N V STM	STM	5,840	$252.5k5.8k shares
LITHIA MTRS INC LAD	LAD	836	$251.4k836 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