WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

CHICAGO, IL · CIK 1644956 · 13F filing filed 2026-08-12

SEC-registered investment adviser since 2014 · limited liability company

Assets managed$65.6bn
Staff388 · 142 in investment roles
Main clients (by assets)Private funds 34%, Mutual funds and ETFs 24%, State and local governments 18%
Private funds9 · $464.4m gross assets
Form ADV · 2026-04-09SEC adviser record

Legal entityWILLIAM BLAIR INVESTMENT MANAGEMENT, LLC (US)

$33.3bn reported value +9.9% vs Q1 2026

403positions

28.9%in top 10

47 new 119 added 230 reduced 57 sold out vs Q1 2026

Also in the report of:

Russell Investments Group, Ltd. – $41.7m of shares are in both reports

Shares in two reports are counted once in each security's totals.

Holdings, Q2 2026

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	TAIWAN SEMICONDUCTOR MFG LTD SPONSORED ADS TSM	TSM	4,936,408	$2.4bn7.09%	7.09%	Reduced -581.9k	-581,852 -10.5%
2	NVIDIA CORPORATION COM NVDA	NVDA	8,599,021	$1.7bn5.17%	5.17%	Reduced -342.7k	-342,735 -3.8%
3	ALPHABET INC CAP STK CL A GOOGL	GOOGL	3,191,012	$1.1bn3.43%	3.43%	Added +686.4k	+686,407 27.4%
4	APPLE INC COM AAPL	AAPL	3,259,914	$943.3m2.84%	2.84%	Reduced -1.6m	-1,552,519 -32.3%
5	BROADCOM INC COM AVGO	AVGO	2,056,135	$776.7m2.34%	2.34%	Reduced -145.4k	-145,423 -6.6%
6	MICROSOFT CORP COM MSFT	MSFT	2,048,642	$764.2m2.30%	2.30%	Reduced -848.1k	-848,140 -29.3%
7	META PLATFORMS INC CL A META	META	950,115	$535.2m1.61%	1.61%	Reduced -63.0k	-63,007 -6.2%
8	AMAZON COM INC COM AMZN	AMZN	1,987,085	$473.6m1.42%	1.42%	Reduced -1.2m	-1,176,544 -37.2%
9	MASTERCARD INCORPORATED CL A MA	MA	918,005	$471.5m1.42%	1.42%	Reduced -142.6k	-142,646 -13.4%
10	ADVANCED MICRO DEVICES INC COM AMD	AMD	763,517	$443.5m1.33%	1.33%	Reduced -279.1k	-279,077 -26.8%
11	APPLIED MATLS INC COM AMAT	AMAT	497,946	$360.0m1.08%	1.08%	Added +463.0k	+463,006 1325.2%
12	GE AEROSPACE COM NEW GE	GE	790,801	$295.5m0.89%	0.89%	New
13	ASTRAZENECA PLC ORD AZN	AZN	1,514,795	$283.2m0.85%	0.85%	Reduced -427.4k	-427,360 -22.0%
14	PRIMO BRANDS CORPORATION CLASS A COM SHS PRMB	PRMB	11,426,823	$279.3m0.84%	0.84%	Reduced -1.6m	-1,629,369 -12.5%
15	PURE STORAGE INC CL A P	P	3,455,381	$272.2m0.82%	0.82%	Added +573.9k	+573,900 19.9%
16	AMPHENOL CORP CL A APH	APH	1,535,059	$270.7m0.81%	0.81%	Added +457.6k	+457,625 42.5%
17	LINDE PLC SHS LIN	LIN	504,953	$262.0m0.79%	0.79%	Reduced -131.4k	-131,385 -20.6%
18	ONTO INNOVATION INC COM ONTO	ONTO	665,377	$251.8m0.76%	0.76%	Reduced -298.8k	-298,836 -31.0%
19	BORGWARNER INC COM BWA	BWA	3,784,707	$251.3m0.76%	0.76%	Added +900.6k	+900,645 31.2%
20	CARLYLE GROUP INC COM CG	CG	5,914,905	$249.1m0.75%	0.75%	Reduced -386.2k	-386,204 -6.1%
21	ARGENX SE SPONSORED ADR ARGX	ARGX	264,617	$245.5m0.74%	0.74%	Reduced -1.4k	-1,450 -0.5%
22	MUELLER INDS INC COM MLI	MLI	1,986,139	$244.2m0.73%	0.73%	Reduced -123.6k	-123,590 -5.9%
23	MONSTER BEVERAGE CORP NEW COM MNST	MNST	2,538,136	$244.0m0.73%	0.73%	Reduced -397.1k	-397,111 -13.5%
24	F5 INC COM FFIV	FFIV	586,271	$243.9m0.73%	0.73%	Reduced -63.7k	-63,677 -9.8%
25	CREDICORP LTD COM BAP	BAP	625,144	$243.5m0.73%	0.73%	Added +2.5k	+2,454 0.4%
26	CURTISS WRIGHT CORP COM CW	CW	317,306	$240.4m0.72%	0.72%	Added +85.2k	+85,237 36.7%
27	ITAU UNIBANCO HLDG S A SPON ADR REP PFD ITUB	ITUB	28,283,482	$231.1m0.69%	0.69%	Reduced -3.4m	-3,401,226 -10.7%
28	SNOWFLAKE INC CL A SNOW	SNOW	901,087	$229.3m0.69%	0.69%	Reduced -226.4k	-226,438 -20.1%
29	TWIST BIOSCIENCE CORP COM TWST	TWST	2,174,594	$223.7m0.67%	0.67%	Reduced -3.1m	-3,095,124 -58.7%
30	TEVA PHARMACEUTICAL INDS LTD SPONSORED ADS SPONSORED ADS		6,593,221	$223.4m0.67%	0.67%	Added +5.2m	+5,167,554 362.5%
31	UNITEDHEALTH GROUP INC COM UNH	UNH	523,387	$217.5m0.65%	0.65%	Reduced -149.9k	-149,876 -22.3%
32	CROWDSTRIKE HLDGS INC CL A CRWD	CRWD	281,409	$214.8m0.65%	0.65%	New
33	REGAL REXNORD CORPORATION COM RRX	RRX	891,139	$212.3m0.64%	0.64%	Added +53.6k	+53,646 6.4%
34	KRYSTAL BIOTECH INC COM KRYS	KRYS	570,153	$211.9m0.64%	0.64%	Added +163.0k	+162,975 40.0%
35	CARPENTER TECHNOLOGY CORP COM CRS	CRS	332,607	$205.2m0.62%	0.62%	Reduced -18.3k	-18,289 -5.2%
36	POWER INTEGRATIONS INC COM POWI	POWI	2,382,007	$199.5m0.60%	0.60%	Added +1.3k	+1,330 0.1%
37	NVENT ELECTRIC PLC SHS NVT	NVT	1,167,763	$198.1m0.60%	0.60%	Reduced -66.1k	-66,111 -5.4%
38	GUARDANT HEALTH INC COM GH	GH	1,311,320	$196.7m0.59%	0.59%	Added +360.2k	+360,206 37.9%
39	HALOZYME THERAPEUTICS INC COM HALO	HALO	2,511,050	$196.5m0.59%	0.59%	Reduced -14.9k	-14,925 -0.6%
40	TALEN ENERGY CORP COM TLN	TLN	497,660	$191.2m0.58%	0.58%	Reduced -27.6k	-27,554 -5.2%
41	TRANSUNION COM TRU	TRU	2,648,744	$191.1m0.57%	0.57%	Reduced -242.4k	-242,443 -8.4%
42	CAMECO CORP COM CCJ	CCJ	1,858,735	$189.3m0.57%	0.57%	Added +176.4k	+176,432 10.5%
43	STERLING INFRASTRUCTURE INC COM STRL	STRL	223,697	$187.8m0.56%	0.56%	Reduced -99.7k	-99,724 -30.8%
44	COSTCO WHSL CORP NEW COM COST	COST	199,355	$186.5m0.56%	0.56%	Reduced -103.1k	-103,113 -34.1%
45	ALIGNMENT HEALTHCARE INC COM ALHC	ALHC	7,761,403	$184.8m0.56%	0.56%	Added +2.5m	+2,546,789 48.8%
46	C H ROBINSON WORLDWIDE INC COM NEW CHRW	CHRW	978,297	$184.3m0.55%	0.55%	Reduced -63.4k	-63,361 -6.1%
47	SEAGATE TECHNOLOGY HLDNGS PL ORD SHS STX	STX	190,847	$184.2m0.55%	0.55%	New
48	DIODES INC COM DIOD	DIOD	1,682,686	$184.2m0.55%	0.55%	Added +1.2m	+1,241,124 281.1%
49	BWX TECHNOLOGIES INC COM BWXT	BWXT	941,233	$183.2m0.55%	0.55%	Reduced -40.5k	-40,549 -4.1%
50	AKAMAI TECHNOLOGIES INC COM AKAM	AKAM	1,535,467	$181.5m0.55%	0.55%	Reduced -83.6k	-83,593 -5.2%
51	THE BALDWIN INSURANCE GRP IN COM CL A BWIN	BWIN	6,732,965	$179.0m0.54%	0.54%	Reduced -61.5k	-61,527 -0.9%
52	BENTLEY SYS INC COM CL B BSY	BSY	5,942,507	$177.6m0.53%	0.53%	Added +2.6m	+2,619,784 78.8%
53	LATTICE SEMICONDUCTOR CORP COM LSCC	LSCC	1,160,417	$177.5m0.53%	0.53%	Reduced -883.3k	-883,303 -43.2%
54	MADRIGAL PHARMACEUTICALS INC COM MDGL	MDGL	324,123	$174.0m0.52%	0.52%	Reduced -16.4k	-16,396 -4.8%
55	EVEREST GROUP LTD COM EG	EG	479,877	$171.4m0.52%	0.52%	Reduced -26.3k	-26,289 -5.2%
56	AGILENT TECHNOLOGIES INC COM A	A	1,287,265	$171.0m0.51%	0.51%	Reduced -508.5k	-508,499 -28.3%
57	OREILLY AUTOMOTIVE INC COM ORLY	ORLY	1,855,002	$170.8m0.51%	0.51%	Reduced -355.0k	-355,032 -16.1%
58	DYNATRACE INC COM NEW DT	DT	3,857,741	$169.4m0.51%	0.51%	Added +628.7k	+628,690 19.5%
59	MIRUM PHARMACEUTICALS INC COM MIRM	MIRM	1,404,741	$164.5m0.49%	0.49%	Added +1.1m	+1,069,072 318.5%
60	HEALTHEQUITY INC COM HQY	HQY	1,773,227	$160.2m0.48%	0.48%	Added +113.6k	+113,611 6.8%
61	IDEXX LABS INC COM IDXX	IDXX	298,154	$157.0m0.47%	0.47%	Reduced -53.5k	-53,467 -15.2%
62	SERVICENOW INC COM NOW	NOW	1,551,192	$154.0m0.46%	0.46%	Reduced -820.4k	-820,422 -34.6%
63	SYNAPTICS INC COM SYNA	SYNA	1,239,622	$154.0m0.46%	0.46%	Reduced -346.6k	-346,622 -21.9%
64	TEXAS INSTRS INC COM TXN	TXN	506,229	$150.9m0.45%	0.45%	Added +82.0k	+82,034 19.3%
65	SHARKNINJA INC COM SHS SN	SN	986,806	$150.3m0.45%	0.45%	Reduced -86.6k	-86,578 -8.1%
66	WEST PHARMACEUTICAL SVSC INC COM WST	WST	417,309	$149.8m0.45%	0.45%	Added +377.6k	+377,584 950.5%
67	GRAND CANYON ED INC COM LOPE	LOPE	1,038,828	$148.7m0.45%	0.45%	Added +59.1k	+59,094 6.0%
68	LITTELFUSE INC COM LFUS	LFUS	321,681	$146.5m0.44%	0.44%	Added +17.1k	+17,106 5.6%
69	CANADIAN NAT RES LTD COM CNQ	CNQ	3,635,082	$143.7m0.43%	0.43%	New
70	RELIANCE INC COM RS	RS	382,494	$142.9m0.43%	0.43%	Reduced -21.0k	-20,993 -5.2%
71	TOTALENERGIES SE ACT TTE	TTE	1,819,275	$141.4m0.43%	0.43%	Added +965.5k	+965,524 113.1%
72	FORGENT POWER SOLUTIONS INC COM SHS CL A FPS	FPS	2,516,270	$140.6m0.42%	0.42%	New
73	PTC THERAPEUTICS INC COM PTCT	PTCT	1,722,688	$140.5m0.42%	0.42%	New
74	TIMKEN CO COM TKR	TKR	954,839	$138.8m0.42%	0.42%	Added +949.7k	+949,663 18347.4%
75	CYTOKINETICS INC COM NEW CYTK	CYTK	1,603,442	$136.6m0.41%	0.41%	Added +515.9k	+515,851 47.4%
76	LINCOLN ELEC HLDGS INC COM LECO	LECO	506,862	$134.6m0.40%	0.40%	Reduced -28.0k	-27,989 -5.2%
77	EAGLE MATLS INC COM EXP	EXP	576,712	$129.8m0.39%	0.39%	Reduced -53.7k	-53,680 -8.5%
78	CLEAN HARBORS INC COM CLH	CLH	419,210	$125.2m0.38%	0.38%	Reduced -23.9k	-23,888 -5.4%
79	NOVANTA INC COM NOVT	NOVT	765,867	$124.3m0.37%	0.37%	Reduced -17.2k	-17,217 -2.2%
80	BIRKENSTOCK HOLDING PLC COM SHS BIRK	BIRK	2,865,895	$123.3m0.37%	0.37%	Added +290.5k	+290,493 11.3%
81	FIRST HORIZON CORPORATION COM FHN	FHN	4,808,223	$123.3m0.37%	0.37%	Reduced -249.9k	-249,869 -4.9%
82	ETSY INC COM ETSY	ETSY	1,598,520	$120.4m0.36%	0.36%	New
83	MILLICOM INTL CELLULAR S A COM STK TIGO	TIGO	1,309,545	$118.9m0.36%	0.36%	Reduced -96.1k	-96,063 -6.8%
84	DIEBOLD NIXDORF INC COM SHS DBD	DBD	1,379,553	$117.3m0.35%	0.35%	Reduced -46.9k	-46,911 -3.3%
85	GARRETT MOTION INC COM GTX	GTX	3,232,883	$117.1m0.35%	0.35%	Reduced -2.5m	-2,529,814 -43.9%
86	ENCOMPASS HEALTH CORP COM EHC	EHC	1,151,085	$116.4m0.35%	0.35%	Added +347.9k	+347,934 43.3%
87	APPFOLIO INC COM CL A APPF	APPF	721,826	$115.7m0.35%	0.35%	Added +78.6k	+78,595 12.2%
88	MARRIOTT INTL INC NEW CL A MAR	MAR	300,872	$111.5m0.34%	0.34%	Added +216.2k	+216,241 255.5%
89	NATIONAL BK HLDGS CORP CL A NBHC	NBHC	2,497,817	$111.0m0.33%	0.33%	Added +23.0k	+22,956 0.9%
90	CHIPOTLE MEXICAN GRILL INC COM CMG	CMG	3,235,762	$110.0m0.33%	0.33%	Reduced -674.9k	-674,911 -17.3%
91	SAIA INC COM SAIA	SAIA	259,020	$109.1m0.33%	0.33%	Added +88.9k	+88,875 52.2%
92	REPLIGEN CORP COM RGEN	RGEN	788,571	$107.6m0.32%	0.32%	New
93	FRESHPET INC COM FRPT	FRPT	1,810,994	$107.1m0.32%	0.32%	Reduced -2.2k	-2,191 -0.1%
94	JAZZ PHARMACEUTICALS PLC SHS USD JAZZ	JAZZ	436,893	$105.3m0.32%	0.32%	Added +366.0k	+366,010 516.4%
95	MARTIN MARIETTA MATLS INC COM MLM	MLM	181,902	$104.9m0.32%	0.32%	Reduced -90.5k	-90,490 -33.2%
96	KNIGHT-SWIFT TRANSN HLDGS IN CL A KNX	KNX	1,330,047	$103.6m0.31%	0.31%	Added +386.8k	+386,761 41.0%
97	WEATHERFORD INTL PLC ORD SHS WFRD	WFRD	1,260,878	$102.8m0.31%	0.31%	Added +680.9k	+680,947 117.4%
98	GLOBUS MED INC CL A GMED	GMED	1,284,896	$101.5m0.31%	0.31%	Reduced -724.9k	-724,867 -36.1%
99	NU HLDGS LTD ORD SHS CL A NU	NU	7,596,051	$101.5m0.31%	0.31%	Reduced -4.7m	-4,671,549 -38.1%
100	HUDBAY MINERALS INC COM HBM	HBM	4,215,842	$99.5m0.30%	0.30%	New

Sold out since Q1 2026

Security	Ticker	Shares held before	Value then
COHERENT CORP COHR	COHR	668,137	$159.2m668.1k shares
VEEVA SYS INC VEEV	VEEV	643,325	$113.0m643.3k shares
DOXIMITY INC DOCS	DOCS	4,834,220	$112.6m4.8m shares
PLANET FITNESS INC PLNT	PLNT	1,452,642	$108.0m1.5m shares
POOL CORP POOL	POOL	452,273	$91.5m452.3k shares
ADVANCED DRAIN SYS INC DEL WMS	WMS	655,684	$89.9m655.7k shares
PARSONS CORP DEL PSN	PSN	1,487,529	$80.6m1.5m shares
TYLER TECHNOLOGIES INC TYL	TYL	215,748	$73.9m215.7k shares
INSPIRE MED SYS INC INSP	INSP	1,137,384	$58.7m1.1m shares
SPOTIFY TECHNOLOGY S A SPOT	SPOT	106,941	$51.9m106.9k shares
BELLRING BRANDS INC BRBR	BRBR	3,032,100	$48.8m3.0m shares
GOLD FIELDS LTD GFI	GFI	1,024,824	$46.5m1.0m shares
LOUISIANA PAC CORP LPX	LPX	596,108	$43.4m596.1k shares
BLOOM ENERGY CORP BE	BE	317,721	$43.0m317.7k shares
SILA REALTY TRUST INC		1,387,324	$32.9m1.4m shares
THERMON GROUP HLDGS INC		647,539	$32.6m647.5k shares
ACV AUCTIONS INC		7,212,623	$30.6m7.2m shares
INSULET CORP PODD	PODD	139,130	$29.2m139.1k shares
SIMPLY GOOD FOODS CO SMPL	SMPL	1,910,640	$27.4m1.9m shares
TRI POINTE HOMES INC TPH	TPH	574,030	$26.8m574.0k shares
I3 VERTICALS INC IIIV	IIIV	1,176,960	$26.3m1.2m shares
WILLSCOT HLDGS CORP WSC	WSC	1,494,201	$25.9m1.5m shares
AMPRIUS TECHNOLOGIES INC AMPX	AMPX	1,170,131	$19.7m1.2m shares
AEHR TEST SYS AEHR	AEHR	513,293	$19.0m513.3k shares
LUMENTUM HLDGS INC LITE	LITE	26,579	$18.7m26.6k 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
THE BALDWIN INSURANCE GRP IN BWIN · 13G · filed 2026-05-07	BWIN	7.0%≈ $180.6m	-3.9 pts	13G	2026-05-07
NATIONAL VISION HLDGS INC EYE · 13G · filed 2025-11-12	EYE	6.2%≈ $93.1m	new	13G	2025-11-12
NATIONAL BK HLDGS CORP NBHC · 13G · filed 2026-05-08	NBHC	5.7%≈ $113.7m	new	13G	2026-05-08
PERELLA WEINBERG PARTNERS PWP · 13G · filed 2025-11-12	PWP	5.7%≈ $58.7m	new	13G	2025-11-12
REVOLVE GROUP INC RVLV · 13G · filed 2026-08-11	RVLV	5.6%≈ $53.4m	+1.3 pts	13G	2026-08-11