BLAIR WILLIAM & CO/IL

CIK

902367

Location

CHICAGO, IL

Portfolio Value

Large $28,938,925,910

Diversification

Diversified

Filing Date

Global Rank

#220 / 8,623 ▼ 15 · as of Mar 2026

Top Industry

Software - Infrastructure 7.1%

3Y Alpha vs SPY

-8.1%

Period ended 4 months ago

Filed May 8, 2026 · 3mo

25 quarters · since Mar 2020

Clone Performance

Jul 2023–Jul 2026 · vs SPY

Hypothetical growth of buying every stock this filer reported holding, rebalancing on each filing and indexed to the same start. Option positions cannot be bought this way and are left out.

Cloned portfolio

+34.5%

SPY

+65.3%

Annualised alpha

-7.8%

Max drawdown

−18.1%

Estimate. 13F holdings are quarter-lagged, so the clone rebalances about 45 days after each period end — when the filing becomes public — and it excludes option and short positions. It tracks 100% of reported value on average across 13 quarters. Past performance does not predict future results.

Portfolio Concentration

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

Top Position

5.2%

−0.3 pts

Top 5

19.7%

−0.9 pts

Top 10

29.7%

−1.1 pts

HHI

140

Diversified−9

Portfolio Trend

25 quarters · across all stocks

Sector Breakdown

As of Mar 31, 2026

Sector	% Portfolio	Value	Positions
Technology	26.2%	$7,581,623,630	201
Industrials	17.1%	$4,951,466,432	192
Financial Services	14.7%	$4,250,504,839	195
Healthcare	12.8%	$3,695,094,317	170
Consumer Cyclical	8.6%	$2,502,068,212	105
Communication Services	5.4%	$1,576,667,708	36
Consumer Defensive	4.9%	$1,411,702,408	51
Unclassified	3.7%	$1,082,251,503	22
Energy	2.6%	$752,518,608	60
Basic Materials	2.1%	$605,653,183	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
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
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
FUL	Fuller H B Co	6,005	$357,057
NTES	NetEase, Inc.	2,552	$351,205
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

1,181 tracked positions · $28,938,925,910 total · filing declares 1,922 positions · $34,895,892,190 · 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%	5.20%
MSFT	Microsoft Corp Technology	Reduced	3,498,110	-76,458	$1,294,895,378	−25.1%	4.47%
AMZN	Amazon Com Inc Consumer Cyclical	Reduced	6,057,938	-6,486	$1,261,686,747	−9.9%	4.36%
NVDA	Nvidia Corp Technology	Reduced	5,427,875	-66,475	$946,621,400	−7.6%	3.27%
GOOGL	Alphabet Inc. Communication Services	Reduced	2,436,117	-57,463	$700,529,804	−10.2%	2.42%
JPM	Jpmorgan Chase & Co Financial Services	Reduced	2,307,253	-2,556	$678,701,542	−8.8%	2.35%
GEV	GE Vernova Inc. Industrials	Added	664,603	+12,297	$580,131,958	+36.1%	2.00%
V	Visa Inc. Financial Services	Reduced	1,844,583	-84,654	$557,506,765	−17.6%	1.93%
SPY	Spdr S&P 500 ETF Trust	Reduced	845,294	-12,509	$549,728,499	−6.0%	1.90%
IDXX	Idexx Laboratories Inc /De Healthcare	Reduced	946,336	-55,039	$531,736,735	−21.5%	1.84%
COST	Costco Wholesale Corp /New Consumer Defensive	Added	521,277	+95	$519,416,041	+15.6%	1.79%
MA	Mastercard Inc Financial Services	Reduced	923,405	-31,783	$461,388,542	−15.4%	1.59%
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%	1.18%
APH	Amphenol Corp /De/ Technology	Reduced	2,520,319	-133,572	$318,442,305	−11.2%	1.10%
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%	1.00%
AVGO	Broadcom Inc. Technology	Added	918,328	+21,882	$284,231,699	−8.4%	0.98%
SYK	Stryker Corp Healthcare	Added	847,701	+2,802	$278,546,071	−6.2%	0.96%
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%	0.73%
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%	0.72%
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%	0.63%
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%	0.55%
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%	0.50%
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%

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.