BLAIR WILLIAM & CO/IL

CIK

902367

Location

CHICAGO, IL

Portfolio Value

Large $28,800,011,577

Diversification

Diversified

Filing Date

Global Rank

#219 / 8,607 ▼ 15 · as of Mar 2026

Top Industry

Software - Infrastructure 6.8%

3Y Alpha vs SPY

-9.7%

Period ended 3 months ago

Filed May 8, 2026 · 2mo

25 quarters · since Mar 2020

Clone Performance

Jul 2023–Jul 2026 · vs SPY

Hypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.

Cloned portfolio

+35.7%

SPY

+75.5%

Annualised alpha

-9.9%

Max drawdown

−18.1%

Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.

Portfolio Concentration

1,181 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025

Top Position

5.2%

−0.3 pts

Top 5

19.8%

−0.9 pts

Top 10

29.9%

−1.1 pts

HHI

141

Diversified−9

Portfolio Trend

25 quarters · across all stocks

Sector Breakdown

As of Mar 31, 2026

Sector	% Portfolio	Value	Positions
Technology	25.9%	$7,466,032,490	201
Industrials	17.2%	$4,952,263,202	192
Financial Services	14.7%	$4,242,609,057	195
Healthcare	12.8%	$3,696,511,004	170
Consumer Cyclical	8.6%	$2,484,567,656	105
Communication Services	5.5%	$1,576,667,708	36
Consumer Defensive	4.9%	$1,411,702,408	51
Unclassified	3.7%	$1,075,177,233	22
Energy	2.6%	$752,518,608	60
Basic Materials	2.1%	$612,587,141	52
Real Estate	1.3%	$369,879,933	48
Utilities	0.6%	$159,495,137	49

Last Quarter's Activity

Export CSV

Mar 31, 2026 vs Dec 31, 2025

Added To

Positions the filer increased

25 positions

Ticker	Company	Δ Shares	Shares	Value
MDLN	Medline Inc.	+1,117,380	1,165,430	$51,861,635
TECH	BIO-TECHNE Corp	+635,517	864,329	$45,169,833
TDUP	ThredUp Inc.	+576,399	2,082,554	$6,830,777
MDLZ	Mondelez International, Inc.	+445,836	802,444	$46,252,872
DOCN	DigitalOcean Holdings, Inc.	+401,671	426,570	$36,591,174
FAST	Fastenal Co	+359,041	7,373,707	$342,140,004
MCHP	Microchip Technology Inc	+327,309	589,868	$38,111,371
EPD	Enterprise Products Partners L.P.	+300,456	1,454,357	$55,032,868
NFLX	Netflix Inc	+267,756	1,763,451	$169,555,813
NDAQ	Nasdaq, Inc.	+266,137	1,026,010	$87,097,988
NKE	NIKE, Inc.	+249,624	388,727	$20,532,560
BA	Boeing Co	+243,515	922,102	$183,525,961
SU	Suncor Energy Inc	+233,488	412,174	$27,248,823
MRVL	Marvell Technology, Inc.	+228,898	723,976	$71,709,822
ARCC	Ares Capital Corp	+204,209	436,676	$7,868,901
AIOT	Powerfleet, Inc.	+195,250	935,372	$2,880,945
ATI	Ati Inc	+192,894	236,996	$34,473,438
SCHW	Schwab Charles Corp	+172,882	890,345	$83,674,623
WFC	Wells Fargo & Company/Mn	+171,674	467,212	$37,194,747
BCPC	Balchem Corp	+163,473	203,519	$34,492,400
PWR	Quanta Services, Inc.	+145,549	225,850	$123,996,167
FANG	Diamondback Energy, Inc.	+141,152	445,338	$88,083,403
CHD	Church & Dwight Co Inc /De/	+141,035	309,031	$28,838,772
GLD	Spdr Gold Trust	+131,532	386,735	$166,408,203
FNV	FRANCO NEVADA Corp	+130,091	158,256	$39,097,144
No positions match the current search.

Trimmed

Positions the filer reduced

25 positions

Ticker	Company	Δ Shares	Shares	Value
CWAN	Clearwater Analytics Holdings, Inc.	−3,295,378	77,582	$1,834,814
STKL	SunOpta Inc.	−1,412,658	14,337	$92,903
IOT	Samsara Inc.	−1,173,208	149,738	$4,745,197
CSGP	Costar Group, Inc.	−1,123,210	900,313	$36,318,626
CRDF	Cardiff Oncology, Inc.	−1,026,440	922,407	$1,494,299
PCOR	Procore Technologies, Inc.	−967,748	259,761	$14,806,377
RYAN	Ryan Specialty Holdings, Inc.	−880,891	1,641,580	$55,386,909
UBER	Uber Technologies, Inc	−807,962	3,299,596	$237,339,940
WDAY	Workday, Inc.	−574,666	254,398	$33,051,388
GCMG	GCM Grosvenor Inc.	−557,510	354,306	$3,472,198
NOW	ServiceNow, Inc.	−413,852	1,800,988	$188,293,295
CPRT	Copart Inc	−343,984	4,070,990	$135,156,868
AFRM	Affirm Holdings, Inc.	−264,485	56,198	$2,574,992
BILL	BILL Holdings, Inc.	−260,324	12,418	$475,609
ABT	Abbott Laboratories	−250,038	1,327,761	$136,321,221
DVN	Devon Energy Corp/De	−248,548	251,102	$12,635,452
TRU	TransUnion	−247,563	11,413	$789,665
SOFI	SoFi Technologies, Inc.	−246,108	405,759	$6,443,452
CHWY	Chewy, Inc.	−231,363	606,765	$16,382,655
ONON	On Holding AG	−230,908	22,835	$776,846
AMT	American Tower Corp /Ma/	−208,116	470,128	$81,134,690
BX	Blackstone Inc.	−190,433	1,178,612	$135,528,593
ADBE	Adobe Inc.	−189,575	128,873	$31,326,448
DSGX	Descartes Systems Group Inc	−188,307	29,360	$2,101,001
PGR	Progressive Corp/Oh/	−187,283	1,219,749	$241,803,041
No positions match the current search.

New Positions

Positions the filer opened this quarter

25 positions

Ticker	Company	Shares	Value
AZN	Astrazeneca PLC	100,622	$19,844,670
SIMO	Silicon Motion Technology CORP	103,179	$11,585,969
GH	Guardant Health, Inc.	103,644	$9,573,596
SLDB	Solid Biosciences Inc.	651,216	$4,688,755
RYN	Rayonier Inc	130,939	$2,699,962
EXPO	Exponent Inc	28,806	$1,879,591
RLI	Rli Corp	31,573	$1,800,923
ICFI	ICF International, Inc.	23,784	$1,552,857
BLDR	Builders FirstSource, Inc.	13,450	$1,107,338
SUNB	Sunbelt Rentals Holdings, Inc.	16,200	$1,054,458
PINE	Alpine Income Property Trust, Inc.	57,515	$1,035,270
DFTX	Definium Therapeutics, Inc.	53,695	$1,014,835
MANU	Manchester United plc	57,456	$966,409
DIOD	Diodes Inc /Del/	14,005	$955,981
BATRA	Atlanta Braves Holdings, Inc.	19,604	$924,328
MNR	Mach Natural Resources LP	62,429	$874,006
AR	ANTERO RESOURCES Corp	19,020	$807,208
NOG	Northern Oil & Gas, Inc.	27,380	$800,317
CRL	Charles River Laboratories International, Inc.	4,575	$789,187
ALHC	Alignment Healthcare, Inc.	42,450	$747,969
TRP	Tc Energy Corp	10,795	$675,767
HALO	Halozyme Therapeutics, Inc.	10,203	$659,419
USO	United States Oil Fund, LP	5,029	$639,940
MBWM	Mercantile Bank Corp	12,189	$615,544
WMS	Advanced Drainage Systems, Inc.	4,167	$571,420
No positions match the current search.

Sold Out

Positions the filer fully exited

25 positions

Ticker	Company	Shares	Value
EXAS	EXACT SCIENCES CORP	128,517	$13,052,186
QLYS	Qualys, Inc.	47,958	$6,373,618
COOK	Traeger, Inc.	92,680	$5,004,720
GXO	GXO Logistics, Inc.	91,791	$4,831,878
DSGR	Distribution Solutions Group, Inc.	112,870	$3,091,509
THR	Thermon Group Holdings, Inc.	61,065	$2,269,175
BRSP	BrightSpire Capital, Inc.	370,564	$2,075,158
MRCC	MONROE CAPITAL Corp	309,750	$1,973,107
BRO	Brown & Brown, Inc.	23,545	$1,876,536
HOLX	HOLOGIC INC	20,073	$1,495,237
BKV	BKV Corp	42,345	$1,149,666
CRK	Comstock Resources Inc	40,572	$940,458
CWEN	Clearway Energy, Inc.	23,820	$792,253
MODD	Modular Medical, Inc.	67,586	$738,039
SEE	SEALED AIR CORP/DE	16,818	$696,769
FLYW	Flywire Corp	41,021	$580,857
TWFG	TWFG, Inc.	19,896	$572,407
RVTY	Revvity, Inc.	5,876	$568,503
SMWB	Similarweb Ltd.	71,044	$532,119
ACM	Aecom	5,153	$491,235
PDD	PDD Holdings Inc.	4,079	$462,517
BCS	Barclays PLC	17,158	$436,670
SE	Sea Ltd	3,090	$394,190
TCOM	Trip.com Group Ltd	5,352	$384,862
SPSC	Sps Commerce Inc	4,013	$357,678
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

1,181 positions · $28,800,011,577 total · as of Mar 31, 2026

All sectors Basic Materials Communication Services Consumer Cyclical Consumer Defensive Energy Financial Services Healthcare Industrials Real Estate Technology Utilities

Showing 1–50 of 1,181 positions by value · page 1 of 24

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
AAPL	Apple Inc. Technology	Reduced	5,930,914	-19,034	$1,505,206,664	−6.9%	5.23%
MSFT	Microsoft Corp Technology	Reduced	3,498,110	-76,458	$1,294,895,378	−25.1%	4.50%
AMZN	Amazon Com Inc Consumer Cyclical	Reduced	6,057,938	-6,486	$1,261,686,747	−9.9%	4.38%
NVDA	Nvidia Corp Technology	Reduced	5,427,875	-66,475	$946,621,400	−7.6%	3.29%
GOOGL	Alphabet Inc. Communication Services	Reduced	2,436,117	-57,463	$700,529,804	−10.2%	2.43%
JPM	Jpmorgan Chase & Co Financial Services	Reduced	2,307,253	-2,556	$678,701,542	−8.8%	2.36%
GEV	GE Vernova Inc. Industrials	Added	664,603	+12,297	$580,131,958	+36.1%	2.01%
V	Visa Inc. Financial Services	Reduced	1,844,583	-84,654	$557,506,765	−17.6%	1.94%
SPY	Spdr S&P 500 ETF Trust	Reduced	845,294	-12,509	$549,728,499	−6.0%	1.91%
IDXX	Idexx Laboratories Inc /De Healthcare	Reduced	946,336	-55,039	$531,736,735	−21.5%	1.85%
COST	Costco Wholesale Corp /New Consumer Defensive	Added	521,277	+95	$519,416,041	+15.6%	1.80%
MA	Mastercard Inc Financial Services	Reduced	923,405	-31,783	$461,388,542	−15.4%	1.60%
META	Meta Platforms, Inc. Communication Services	Reduced	721,720	-14,482	$412,917,663	−15.0%	1.43%
FAST	Fastenal Co Industrials	Added	7,373,707	+359,041	$342,140,004	+21.5%	1.19%
APH	Amphenol Corp /De/ Technology	Reduced	2,520,319	-133,572	$318,442,305	−11.2%	1.11%
LLY	ELI LILLY & Co Healthcare	Reduced	324,018	-778	$298,022,035	−14.6%	1.03%
WMT	Walmart Inc. Consumer Defensive	Reduced	2,374,282	-38,302	$295,075,766	+9.8%	1.02%
BWXT	BWX Technologies, Inc. Industrials	Reduced	1,438,125	-1,541	$294,082,181	+18.2%	1.02%
ABBV	AbbVie Inc. Healthcare	Reduced	1,334,109	-3,352	$290,155,366	−5.1%	1.01%
AVGO	Broadcom Inc. Technology	Added	918,328	+21,882	$284,231,699	−8.4%	0.99%
SYK	Stryker Corp Healthcare	Added	847,701	+2,802	$278,546,071	−6.2%	0.97%
ICE	Intercontinental Exchange, Inc. Financial Services	Reduced	1,593,628	-96,938	$250,645,811	−8.5%	0.87%
HD	Home Depot, Inc. Consumer Cyclical	Added	761,419	+5,237	$250,423,094	−3.8%	0.87%
DHR	Danaher Corp /De/ Healthcare	Reduced	1,296,804	-75,820	$245,874,038	−21.8%	0.85%
PGR	Progressive Corp/Oh/ Financial Services	Reduced	1,219,749	-187,283	$241,803,041	−24.5%	0.84%
BRK-B	Berkshire Hathaway Inc Financial Services	Added	495,322	+48,260	$237,358,302	+5.6%	0.82%
UBER	Uber Technologies, Inc Technology	Reduced	3,299,596	-807,962	$237,339,940	−29.3%	0.82%
JNJ	Johnson & Johnson Healthcare	Added	955,632	+6,057	$233,594,686	+18.9%	0.81%
ECL	Ecolab Inc. Basic Materials	Added	866,411	+8,540	$230,482,654	+2.3%	0.80%
WSO	Watsco Inc Industrials	Reduced	582,700	-92,740	$211,980,433	−6.9%	0.74%
AXP	American Express Co Financial Services	Reduced	693,767	-6,280	$209,850,642	−19.0%	0.73%
PANW	Palo Alto Networks Inc Technology	Added	1,304,858	+54,486	$209,194,834	−9.2%	0.73%
ISRG	Intuitive Surgical Inc Healthcare	Reduced	425,228	-14,142	$196,025,855	−21.2%	0.68%
TDG	TransDigm Group INC Industrials	Reduced	166,248	-3,982	$192,674,782	−14.9%	0.67%
NOW	ServiceNow, Inc. Technology	Reduced	1,800,988	-413,852	$188,293,295	−44.5%	0.65%
VEEV	Veeva Systems Inc Healthcare	Reduced	1,067,576	-161,002	$187,530,400	−31.6%	0.65%
BA	Boeing Co Industrials	Added	922,102	+243,515	$183,525,961	+24.6%	0.64%
QQQ	Invesco Qqq Trust, Series 1	Added	311,016	+29,716	$179,512,214	+3.9%	0.62%
P	Everpure, Inc. Technology	Reduced	2,918,046	-135,576	$172,281,435	−15.8%	0.60%
NFLX	Netflix Inc Communication Services	Added	1,763,451	+267,756	$169,555,813	+20.9%	0.59%
GLD	Spdr Gold Trust	Added	386,735	+131,532	$166,408,203	+64.5%	0.58%
CTAS	Cintas Corp Industrials	Reduced	973,553	-21,464	$164,666,754	−12.0%	0.57%
XOM	ExxonMobil Holdings Corp Energy	Reduced	946,386	-21,751	$160,563,848	+37.8%	0.56%
CVX	Chevron Corp Energy	Added	715,986	+49,527	$148,137,503	+45.8%	0.51%
GWRE	Guidewire Software, Inc. Technology	Reduced	975,296	-159,255	$145,865,269	−36.0%	0.51%
ANET	Arista Networks, Inc. Technology	Added	1,151,227	+26,667	$141,347,651	−4.1%	0.49%
ABT	Abbott Laboratories Healthcare	Reduced	1,327,761	-250,038	$136,321,221	−31.0%	0.47%
AON	Aon plc Financial Services	Reduced	421,605	-74,702	$136,085,661	−22.3%	0.47%
BX	Blackstone Inc. Financial Services	Reduced	1,178,612	-190,433	$135,528,593	−35.8%	0.47%
CPRT	Copart Inc Industrials	Reduced	4,070,990	-343,984	$135,156,868	−21.8%	0.47%