BLAIR WILLIAM & CO/IL

CHICAGO, IL · CIK 902367 · 13F filing filed 2023-08-11

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)

$27.3bn reported value +9.0% vs Q1 2023

1,809positions

24.4%in top 10

102 new 680 added 740 reduced 94 sold out vs Q1 2023

Holdings, Q2 2023

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	3,676,873	$1.3bn4.59%	4.59%	Added +9.1k	+9,116 0.2%
2	APPLE INC COM AAPL	AAPL	6,455,023	$1.3bn4.59%	4.59%	Added +301	+301 0.0%
3	AMAZON COM INC COM AMZN	AMZN	5,700,188	$743.1m2.72%	2.72%	Added +87.1k	+87,088 1.6%
4	IDEXX LABS INC COM IDXX	IDXX	1,192,133	$598.7m2.19%	2.19%	Reduced -17.1k	-17,061 -1.4%
5	DEXCOM INC COM DXCM	DXCM	4,433,499	$569.7m2.09%	2.09%	Added +77.0k	+77,048 1.8%
6	VISA INC COM CL A V	V	2,206,385	$524.0m1.92%	1.92%	Reduced -30.9k	-30,863 -1.4%
7	MASTERCARD INCORPORATED CL A MA	MA	1,199,917	$471.9m1.73%	1.73%	Reduced -6.0k	-5,970 -0.5%
8	ALPHABET INC CAP STK CL C GOOG	GOOG	3,524,323	$426.3m1.56%	1.56%	Reduced -1.9k	-1,891 -0.1%
9	ZOETIS INC CL A ZTS	ZTS	2,395,591	$412.5m1.51%	1.51%	Added +40.7k	+40,692 1.7%
10	DANAHER CORPORATION COM DHR	DHR	1,662,122	$398.9m1.46%	1.46%	Added +19.8k	+19,761 1.2%
11	WORKDAY INC CL A WDAY	WDAY	1,573,304	$355.4m1.30%	1.30%	Reduced -4.1k	-4,090 -0.3%
12	COSTAR GROUP INC COM CSGP	CSGP	3,939,827	$350.6m1.28%	1.28%	Added +184.8k	+184,794 4.9%
13	ADOBE INC COM ADBE	ADBE	671,295	$328.3m1.20%	1.20%	Added +14.4k	+14,402 2.2%
14	SPDR S&P 500 ETF TR TR UNIT SPY	SPY	717,731	$318.2m1.17%	1.17%	Reduced -2.4k	-2,386 -0.3%
15	JPMORGAN CHASE & CO COM JPM	JPM	2,130,031	$309.8m1.13%	1.13%	Added +52.2k	+52,213 2.5%
16	COSTCO WHSL CORP NEW COM COST	COST	555,279	$299.0m1.10%	1.10%	Added +55.9k	+55,929 11.2%
17	ALPHABET INC CAP STK CL A GOOGL	GOOGL	2,484,521	$297.4m1.09%	1.09%	Added +81.2k	+81,151 3.4%
18	WATSCO INC COM WSO	WSO	765,479	$292.0m1.07%	1.07%	Added +35.6k	+35,609 4.9%
19	VEEVA SYS INC CL A COM VEEV	VEEV	1,453,412	$287.4m1.05%	1.05%	Reduced -50.9k	-50,850 -3.4%
20	POOL CORP COM POOL	POOL	765,318	$286.7m1.05%	1.05%	Added +42.2k	+42,191 5.8%
21	STRYKER CORPORATION COM SYK	SYK	875,159	$267.0m0.98%	0.98%	Added +114	+114 0.0%
22	STARBUCKS CORP COM SBUX	SBUX	2,585,852	$256.2m0.94%	0.94%	Reduced -57.1k	-57,074 -2.2%
23	FISERV INC COM FISV	FISV	1,989,298	$250.9m0.92%	0.92%	Reduced -4.3k	-4,293 -0.2%
24	AON PLC SHS CL A AON	AON	719,184	$248.3m0.91%	0.91%	Reduced -7.0k	-6,987 -1.0%
25	COPART INC COM CPRT	CPRT	2,669,733	$243.5m0.89%	0.89%	Reduced -56.2k	-56,172 -2.1%
26	HOME DEPOT INC COM HD	HD	679,127	$211.0m0.77%	0.77%	Added +1.7k	+1,734 0.3%
27	PROGRESSIVE CORP COM PGR	PGR	1,584,718	$209.8m0.77%	0.77%	Added +117.5k	+117,461 8.0%
28	INTERCONTINENTAL EXCHANGE IN COM ICE	ICE	1,842,428	$208.3m0.76%	0.76%	Added +7.4k	+7,427 0.4%
29	ABBOTT LABS COM ABT	ABT	1,843,979	$201.0m0.74%	0.74%	Reduced -19.5k	-19,471 -1.0%
30	INTUIT COM INTU	INTU	430,991	$197.5m0.72%	0.72%	Reduced -8.6k	-8,621 -2.0%
31	TYLER TECHNOLOGIES INC COM TYL	TYL	471,320	$196.3m0.72%	0.72%	Reduced -9.5k	-9,549 -2.0%
32	FASTENAL CO COM FAST	FAST	3,302,124	$194.8m0.71%	0.71%	Reduced -4.2k	-4,227 -0.1%
33	ACCENTURE PLC IRELAND SHS CLASS A ACN	ACN	627,023	$193.5m0.71%	0.71%	Added +7.3k	+7,258 1.2%
34	ECOLAB INC COM ECL	ECL	947,209	$176.8m0.65%	0.65%	Added +10.9k	+10,942 1.2%
35	NVIDIA CORPORATION COM NVDA	NVDA	416,769	$176.3m0.65%	0.65%	Added +18.2k	+18,173 4.6%
36	UNITEDHEALTH GROUP INC COM UNH	UNH	366,601	$176.2m0.65%	0.65%	Added +4.2k	+4,195 1.2%
37	SERVICENOW INC COM NOW	NOW	306,941	$172.5m0.63%	0.63%	Reduced -6.1k	-6,071 -1.9%
38	SALESFORCE INC COM CRM	CRM	814,873	$172.1m0.63%	0.63%	Reduced -9.2k	-9,250 -1.1%
39	JOHNSON & JOHNSON COM JNJ	JNJ	1,005,634	$166.5m0.61%	0.61%	Reduced -9.4k	-9,444 -0.9%
40	ISHARES TR CORE S&P500 ETF IVV	IVV	349,991	$156.0m0.57%	0.57%	Reduced -2.4k	-2,367 -0.7%
41	ELI LILLY & CO COM LLY	LLY	330,131	$154.8m0.57%	0.57%	Added +12.6k	+12,633 4.0%
42	TRANSDIGM GROUP INC COM TDG	TDG	170,566	$152.5m0.56%	0.56%	Reduced -448	-448 -0.3%
43	ABBVIE INC COM ABBV	ABBV	1,082,537	$145.9m0.53%	0.53%	Reduced -73.1k	-73,092 -6.3%
44	AMERICAN TOWER CORP NEW COM AMT	AMT	736,886	$142.9m0.52%	0.52%	Added +25.7k	+25,662 3.6%
45	CINTAS CORP COM CTAS	CTAS	286,324	$142.3m0.52%	0.52%	Reduced -232	-232 -0.1%
46	PROCTER AND GAMBLE CO COM PG	PG	926,622	$140.6m0.52%	0.52%	Reduced -12.0k	-11,989 -1.3%
47	PALO ALTO NETWORKS INC COM PANW	PANW	548,748	$140.2m0.51%	0.51%	Reduced -33.0k	-33,044 -5.7%
48	VANGUARD TAX-MANAGED FDS VAN FTSE DEV MKT VEA	VEA	2,946,180	$136.1m0.50%	0.50%	Added +115.3k	+115,330 4.1%
49	DEERE & CO COM DE	DE	334,412	$135.5m0.50%	0.50%	Reduced -1.6k	-1,550 -0.5%
50	AMPHENOL CORP CL A APH	APH	1,544,406	$131.2m0.48%	0.48%	Added +10.6k	+10,607 0.7%
51	COCA COLA CO COM KO	KO	2,102,165	$126.6m0.46%	0.46%	Reduced -6.9k	-6,905 -0.3%
52	INTUITIVE SURGICAL INC COM NEW ISRG	ISRG	365,971	$125.1m0.46%	0.46%	Added +64.8k	+64,773 21.5%
53	ROCKWELL AUTOMATION INC COM ROK	ROK	372,036	$122.6m0.45%	0.45%	Added +7.5k	+7,527 2.1%
54	WALMART INC COM WMT	WMT	778,675	$122.4m0.45%	0.45%	Added +33.2k	+33,185 4.5%
55	AMERICAN EXPRESS CO COM AXP	AXP	700,556	$122.0m0.45%	0.45%	Added +20.0k	+19,961 2.9%
56	BERKSHIRE HATHAWAY INC DEL CL B NEW BRK.B	BRK.B	351,928	$120.0m0.44%	0.44%	Reduced -6.2k	-6,188 -1.7%
57	AMETEK INC COM AME	AME	738,217	$119.5m0.44%	0.44%	Reduced -41	-41 -0.0%
58	ILLINOIS TOOL WKS INC COM ITW	ITW	454,863	$113.8m0.42%	0.42%	Reduced -2.2k	-2,192 -0.5%
59	RYAN SPECIALTY HOLDINGS INC CL A RYAN	RYAN	2,531,069	$113.6m0.42%	0.42%	Reduced -17.1k	-17,059 -0.7%
60	UNION PAC CORP COM UNP	UNP	537,151	$109.9m0.40%	0.40%	Added +16.6k	+16,610 3.2%
61	IRHYTHM TECHNOLOGIES INC COM IRTC	IRTC	1,042,434	$108.7m0.40%	0.40%	Added +33.7k	+33,745 3.4%
62	VANGUARD SPECIALIZED FUNDS DIV APP ETF VIG	VIG	667,917	$108.5m0.40%	0.40%	Added +12.2k	+12,224 1.9%
63	LULULEMON ATHLETICA INC COM LULU	LULU	285,255	$108.0m0.40%	0.40%	Reduced -61	-61 -0.0%
64	MONGODB INC CL A MDB	MDB	260,477	$107.1m0.39%	0.39%	Added +12.7k	+12,746 5.2%
65	UBER TECHNOLOGIES INC COM UBER	UBER	2,456,049	$106.0m0.39%	0.39%	Added +10.7k	+10,734 0.4%
66	CHEVRON CORP NEW COM CVX	CVX	667,833	$105.1m0.38%	0.38%	Added +25.5k	+25,497 4.0%
67	MCDONALDS CORP COM MCD	MCD	338,596	$101.0m0.37%	0.37%	Reduced -4.3k	-4,315 -1.3%
68	EDWARDS LIFESCIENCES CORP COM EW	EW	1,061,669	$100.1m0.37%	0.37%	Added +32.5k	+32,547 3.2%
69	BLACKSTONE INC COM BX	BX	1,072,309	$99.7m0.37%	0.37%	Reduced -56.6k	-56,624 -5.0%
70	CHIPOTLE MEXICAN GRILL INC COM CMG	CMG	45,266	$96.8m0.35%	0.35%	Added +5.0k	+5,028 12.5%
71	PEPSICO INC COM PEP	PEP	518,108	$96.0m0.35%	0.35%	Added +38.9k	+38,860 8.1%
72	VANGUARD INTL EQUITY INDEX F ALLWRLD EX US VEU	VEU	1,761,381	$95.8m0.35%	0.35%	Added +18.0k	+18,025 1.0%
73	LINDE PLC SHS LIN	LIN	250,735	$95.5m0.35%	0.35%	Added +1.3k	+1,260 0.5%
74	VANGUARD INDEX FDS VALUE ETF VTV	VTV	670,769	$95.3m0.35%	0.35%	Reduced -8.6k	-8,564 -1.3%
75	INSULET CORP COM PODD	PODD	326,686	$94.2m0.35%	0.35%	Added +3.1k	+3,136 1.0%
76	MICROCHIP TECHNOLOGY INC. COM MCHP	MCHP	1,049,936	$94.1m0.34%	0.34%	Added +14.5k	+14,466 1.4%
77	VERISK ANALYTICS INC COM VRSK	VRSK	411,642	$93.0m0.34%	0.34%	Added +11.1k	+11,061 2.8%
78	PURE STORAGE INC CL A P	P	2,332,584	$85.9m0.31%	0.31%	Added +142.7k	+142,657 6.5%
79	MERCK & CO INC COM MRK	MRK	718,307	$82.9m0.30%	0.30%	Added +16.4k	+16,435 2.3%
80	ROLLINS INC COM ROL	ROL	1,885,095	$80.7m0.30%	0.30%	Added +4.1k	+4,108 0.2%
81	THERMO FISHER SCIENTIFIC INC COM TMO	TMO	152,805	$79.7m0.29%	0.29%	Reduced -4.9k	-4,929 -3.1%
82	ISHARES TR CORE S&P US VLU IUSV	IUSV	1,017,198	$79.6m0.29%	0.29%	Added +7.6k	+7,644 0.8%
83	CARMAX INC COM KMX	KMX	944,854	$79.1m0.29%	0.29%	Added +67.8k	+67,847 7.7%
84	RESMED INC COM RMD	RMD	348,198	$76.1m0.28%	0.28%	Added +9.9k	+9,869 2.9%
85	BRISTOL-MYERS SQUIBB CO COM BMY	BMY	1,187,113	$75.9m0.28%	0.28%	Reduced -31.9k	-31,934 -2.6%
86	EVOLENT HEALTH INC CL A EVH	EVH	2,451,123	$74.3m0.27%	0.27%	Added +102.5k	+102,540 4.4%
87	LIVE NATION ENTERTAINMENT IN COM LYV	LYV	810,391	$73.8m0.27%	0.27%	Reduced -102.2k	-102,244 -11.2%
88	NEOGEN CORP COM NEOG	NEOG	3,366,083	$73.2m0.27%	0.27%	Added +961.8k	+961,806 40.0%
89	INVESCO QQQ TR UNIT SER 1 QQQ	QQQ	197,167	$72.8m0.27%	0.27%	Reduced -184	-184 -0.1%
90	META PLATFORMS INC CL A META	META	253,640	$72.8m0.27%	0.27%	Added +11.1k	+11,106 4.6%
91	S&P GLOBAL INC COM SPGI	SPGI	178,517	$71.6m0.26%	0.26%	Reduced -1.7k	-1,745 -1.0%
92	GUIDEWIRE SOFTWARE INC COM GWRE	GWRE	939,219	$71.5m0.26%	0.26%	Reduced -70.8k	-70,767 -7.0%
93	FLYWIRE CORPORATION COM VTG FLYW	FLYW	2,264,864	$70.3m0.26%	0.26%	Added +22.0k	+21,981 1.0%
94	OREILLY AUTOMOTIVE INC COM ORLY	ORLY	72,280	$69.0m0.25%	0.25%	Reduced -2.4k	-2,360 -3.2%
95	VANGUARD INDEX FDS S&P 500 ETF SHS VOO	VOO	161,556	$65.8m0.24%	0.24%	Added +22.4k	+22,410 16.1%
96	ALIGN TECHNOLOGY INC COM ALGN	ALGN	183,735	$65.0m0.24%	0.24%	Added +8.3k	+8,255 4.7%
97	ISHARES TR MSCI EAFE ETF EFA	EFA	888,673	$64.4m0.24%	0.24%	Reduced -12.2k	-12,226 -1.4%
98	ISHARES TR RUSSELL 2000 ETF IWM	IWM	337,718	$63.2m0.23%	0.23%	Added +35.1k	+35,057 11.6%
99	WISDOMTREE TR FLOATNG RAT TREA USFR	USFR	1,254,902	$63.1m0.23%	0.23%	Reduced -54.3k	-54,274 -4.2%
100	AUTOMATIC DATA PROCESSING IN COM ADP	ADP	286,751	$63.0m0.23%	0.23%	Reduced -3.4k	-3,397 -1.2%

Sold out since Q1 2023

Security	Ticker	Shares held before	Value then
RITCHIE BROS AUCTIONEERS RBA	RBA	635,779	$35.8m635.8k shares
ABB LTD ABBNY	ABBNY	210,343	$7.2m210.3k shares
CANADIAN PAC RY LTD		88,060	$6.8m88.1k shares
VIASAT INC VSAT	VSAT	95,732	$3.2m95.7k shares
GLACIER BANCORP INC NEW GBCI	GBCI	69,690	$2.9m69.7k shares
PRA GROUP INC PRAA 3.5 06.01.23	PRAA 3.5 06.01.23	2,430,000	$2.4m2.4m shares
PLUG POWER INC PLUG	PLUG	109,319	$1.3m109.3k shares
FOOT LOCKER INC FL	FL	27,578	$1.1m27.6k shares
INVESCO EXCH TRADED FD TR II		115,038	$1.1m115.0k shares
SPDR SER TR		9,790	$822.7k9.8k shares
OAK STR HEALTH INC		20,271	$784.1k20.3k shares
PAGERDUTY INC PD	PD	21,055	$736.5k21.1k shares
DAVE & BUSTERS ENTMT INC PLAY	PLAY	17,695	$651.0k17.7k shares
INNOVATOR ETFS TRUST KJAN	KJAN	20,695	$636.0k20.7k shares
ASGN INC EFOR	EFOR	7,552	$624.3k7.6k shares
CTI BIOPHARMA CORP		132,413	$556.1k132.4k shares
LINCOLN ELEC HLDGS INC LECO	LECO	2,939	$497.0k2.9k shares
PAR TECHNOLOGY CORP PAR	PAR	13,021	$442.2k13.0k shares
TRITON INTL LTD TRTN	TRTN	6,696	$423.3k6.7k shares
ZIFF DAVIS INC ZD	ZD	2,871	$410.1k2.9k shares
SUBURBAN PROPANE PARTNERS L SPH	SPH	25,850	$396.0k25.9k shares
AMER SOFTWARE INC AMSWA	AMSWA	31,011	$391.1k31.0k shares
NEW YORK TIMES CO NYT	NYT	9,582	$372.5k9.6k shares
QUALTRICS INTL INC		20,890	$372.5k20.9k shares
SUMO LOGIC INC		28,999	$347.4k29.0k 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