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William Blair Investment Management, LLC

Form 13F · CIK 1644956. Holdings on 30 Jun 2026, as filed with the SEC on 12 Aug 2026, each set beside the March 2026 quarter. The 13F on the SEC's site.

William Blair Investment Management, LLC reported 403 positions worth $33.3B for the June 2026 quarter, on a Form 13F filed 12 Aug 2026; the largest holding was Taiwan Semiconductor Manufacturing Company Limited, at 7.1% of the fund.

What it bought and sold

The largest moves since the March 2026 quarter, by the dollars that moved: 46 opened, 118 added, 231 trimmed, 56 sold out.

New position: 46

CompanyValueChange in shares
General Electric Co. (GE)$295.5M+790,801
CrowdStrike Holdings, Inc. (CRWD)$214.8M+281,409
Seagate Technology Holdings plc (STX)$184.2M+190,847
Canadian Natural Resources Limited (CNQ)$143.7M+3,635,082
Forgent Power Solutions Inc (FPS)$140.6M+2,516,270
PTC Therapeutics, Inc. (PTCT)$140.5M+1,722,688
Etsy Inc. (ETSY)$120.4M+1,598,520
Repligen Corp. (RGEN)$107.6M+788,571
Hudbay Minerals Inc. (HBM)$99.5M+4,215,842
Applied Optoelectronics, Inc. (AAOI)$74.7M+504,202

Added: 118

CompanyValueChange in shares
Alphabet Inc. (GOOGL)$1.1B+686,407
Applied Materials Inc. (AMAT)$360.0M+463,006
Teva Pharmaceutical Industries Ltd. (TEVA)$223.4M+5,167,554
Diodes Inc. (DIOD)$184.2M+1,241,124
West Pharmaceutical Services Inc. (WST)$149.8M+377,584
Timken Co. (TKR)$138.8M+949,663
Amphenol Corp. (APH)$270.7M+457,625
Mirum Pharmaceuticals, Inc. (MIRM)$164.5M+1,069,072
Guardant Health, Inc. (GH)$196.7M+360,206
Krystal Biotech, Inc. (KRYS)$211.9M+162,975

Trimmed: 231

CompanyValueChange in shares
Taiwan Semiconductor Manufacturing Company Limited (TSM)$2.4B-581,852
Microsoft Corp. (MSFT)$764.2M-848,140
Apple Inc. (AAPL)$943.3M-1,552,519
Advanced Micro Devices Inc. (AMD)$443.5M-279,077
Intuit Inc. (INTU)$34.6M-401,342
Amazon.com Inc. (AMZN)$473.6M-1,176,544
NVIDIA Corp. (NVDA)$1.7B-342,735
Donaldson Co. Inc. (DCI)$3.1M-1,580,385
MercadoLibre, Inc. (MELI)$748.5K-74,408
Bio-Techne Corp. (TECH)$286.8K-2,458,427

Sold out: 56

CompanyValue a quarter beforeChange in shares
Coherent Corp. (COHR)$159.2M-668,137
Veeva Systems Inc. (VEEV)$113.0M-643,325
Doximity, Inc. (DOCS)$112.6M-4,834,220
Planet Fitness, Inc. (PLNT)$108.0M-1,452,642
Pool Corp. (POOL)$91.5M-452,273
Advanced Drainage Systems, Inc. (WMS)$89.9M-655,684
Parsons Corp. (PSN)$80.6M-1,487,529
Tyler Technologies Inc. (TYL)$73.9M-215,748
Inspire Medical Systems, Inc. (INSP)$58.7M-1,137,384
Spotify Technology S.A. (SPOT)$51.9M-106,941

Largest holdings

The 100 largest of 403, by value.

CompanyValueOf the fundSharesChange in sharesMove
Taiwan Semiconductor Manufacturing Company Limited (TSM)$2.4B7.09%4,936,408-581,852Trimmed
NVIDIA Corp. (NVDA)$1.7B5.17%8,599,021-342,735Trimmed
Alphabet Inc. (GOOGL)$1.1B3.43%3,191,012+686,407Added
Apple Inc. (AAPL)$943.3M2.84%3,259,914-1,552,519Trimmed
Broadcom Inc. (AVGO)$776.7M2.34%2,056,135-145,423Trimmed
Microsoft Corp. (MSFT)$764.2M2.30%2,048,642-848,140Trimmed
Meta Platforms, Inc. (META)$535.2M1.61%950,115-63,007Trimmed
Amazon.com Inc. (AMZN)$473.6M1.42%1,987,085-1,176,544Trimmed
Mastercard Inc. (MA)$471.5M1.42%918,005-142,646Trimmed
Advanced Micro Devices Inc. (AMD)$443.5M1.33%763,517-279,077Trimmed
Applied Materials Inc. (AMAT)$360.0M1.08%497,946+463,006Added
General Electric Co. (GE)$295.5M0.89%790,801+790,801New position
AstraZeneca PLC (AZN)$283.2M0.85%1,514,795-427,360Trimmed
Primo Brands Corp. (PRMB)$279.3M0.84%11,426,823-1,629,369Trimmed
Everpure, Inc. (P)$272.2M0.82%3,455,381+573,900Added
Amphenol Corp. (APH)$270.7M0.81%1,535,059+457,625Added
Linde plc (LIN)$262.0M0.79%504,953-131,385Trimmed
Onto Innovation Inc. (ONTO)$251.8M0.76%665,377-298,836Trimmed
Borgwarner Inc. (BWA)$251.3M0.76%3,784,707+900,645Added
Carlyle Group Inc. (CG)$249.1M0.75%5,914,905-386,204Trimmed
argenx SE (ARGX)$245.5M0.74%264,617-1,450Trimmed
Mueller Industries Inc. (MLI)$244.2M0.73%1,986,139-123,590Trimmed
Monster Beverage Corp. (MNST)$244.0M0.73%2,538,136-397,111Trimmed
F5, Inc. (FFIV)$243.9M0.73%586,271-63,677Trimmed
Credicorp Ltd (BAP)$243.5M0.73%625,144+2,454Added
Curtiss Wright Corp. (CW)$240.4M0.72%317,306+85,237Added
Itaú Unibanco Holding S.A. (ITUB)$231.1M0.69%28,283,482-3,401,226Trimmed
Snowflake Inc. (SNOW)$229.3M0.69%901,087-226,438Trimmed
Twist Bioscience Corp. (TWST)$223.7M0.67%2,174,594-3,095,124Trimmed
Teva Pharmaceutical Industries Ltd. (TEVA)$223.4M0.67%6,593,221+5,167,554Added
UnitedHealth Group Inc. (UNH)$217.5M0.65%523,387-149,876Trimmed
CrowdStrike Holdings, Inc. (CRWD)$214.8M0.65%281,409+281,409New position
Regal Rexnord Corp. (RRX)$212.3M0.64%891,139+53,646Added
Krystal Biotech, Inc. (KRYS)$211.9M0.64%570,153+162,975Added
Carpenter Technology Corp. (CRS)$205.2M0.62%332,607-18,289Trimmed
Power Integrations Inc. (POWI)$199.5M0.60%2,382,007+1,330Held
nVent Electric plc (NVT)$198.1M0.60%1,167,763-66,111Trimmed
Guardant Health, Inc. (GH)$196.7M0.59%1,311,320+360,206Added
Halozyme Therapeutics, Inc. (HALO)$196.5M0.59%2,511,050-14,925Trimmed
Talen Energy Corp. (TLN)$191.2M0.57%497,660-27,554Trimmed
TransUnion (TRU)$191.1M0.57%2,648,744-242,443Trimmed
Cameco Corp. (CCJ)$189.3M0.57%1,858,735+176,432Added
Sterling Infrastructure, Inc. (STRL)$187.8M0.56%223,697-99,724Trimmed
Costco Wholesale Corp. (COST)$186.5M0.56%199,355-103,113Trimmed
Alignment Healthcare, Inc. (ALHC)$184.8M0.56%7,761,403+2,546,789Added
C. H. Robinson Worldwide, Inc. (CHRW)$184.3M0.55%978,297-63,361Trimmed
Seagate Technology Holdings plc (STX)$184.2M0.55%190,847+190,847New position
Diodes Inc. (DIOD)$184.2M0.55%1,682,686+1,241,124Added
BWX Technologies, Inc. (BWXT)$183.2M0.55%941,233-40,549Trimmed
Akamai Technologies Inc. (AKAM)$181.5M0.55%1,535,467-83,593Trimmed
Baldwin Insurance Group, Inc. (BWIN)$179.0M0.54%6,732,965-61,527Trimmed
Bentley Systems Inc. (BSY)$177.6M0.53%5,942,507+2,619,784Added
Lattice Semiconductor Corp. (LSCC)$177.5M0.53%1,160,417-883,303Trimmed
Madrigal Pharmaceuticals, Inc. (MDGL)$174.0M0.52%324,123-16,396Trimmed
Everest Group, Ltd. (EG)$171.4M0.52%479,877-26,289Trimmed
Agilent Technologies, Inc. (A)$171.0M0.51%1,287,265-508,499Trimmed
O'Reilly Automotive, Inc. (ORLY)$170.8M0.51%1,855,002-355,032Trimmed
Dynatrace, Inc. (DT)$169.4M0.51%3,857,741+628,690Added
Mirum Pharmaceuticals, Inc. (MIRM)$164.5M0.49%1,404,741+1,069,072Added
Healthequity, Inc. (HQY)$160.2M0.48%1,773,227+113,611Added
IDEXX Laboratories Inc. (IDXX)$157.0M0.47%298,154-53,467Trimmed
ServiceNow, Inc. (NOW)$154.0M0.46%1,551,192-820,422Trimmed
Synaptics Inc. (SYNA)$154.0M0.46%1,239,622-346,622Trimmed
Texas Instruments Inc. (TXN)$150.9M0.45%506,229+82,034Added
SharkNinja, Inc. (SN)$150.3M0.45%986,806-86,578Trimmed
West Pharmaceutical Services Inc. (WST)$149.8M0.45%417,309+377,584Added
Grand Canyon Education, Inc. (LOPE)$148.7M0.45%1,038,828+59,094Added
Littelfuse Inc. (LFUS)$146.5M0.44%321,681+17,106Added
Canadian Natural Resources Limited (CNQ)$143.7M0.43%3,635,082+3,635,082New position
Reliance, Inc. (RS)$142.9M0.43%382,494-20,993Trimmed
TotalEnergies SE (TTE)$141.4M0.42%1,819,275+965,524Added
Forgent Power Solutions Inc (FPS)$140.6M0.42%2,516,270+2,516,270New position
PTC Therapeutics, Inc. (PTCT)$140.5M0.42%1,722,688+1,722,688New position
Timken Co. (TKR)$138.8M0.42%954,839+949,663Added
Cytokinetics Inc. (CYTK)$136.6M0.41%1,603,442+515,851Added
Lincoln Electric Holdings Inc. (LECO)$134.6M0.41%506,862-27,989Trimmed
Eagle Materials Inc. (EXP)$129.8M0.39%576,712-53,680Trimmed
Clean Harbors Inc. (CLH)$125.2M0.38%419,210-23,888Trimmed
Novanta Inc. (NOVT)$124.3M0.37%765,867-17,217Trimmed
Birkenstock Holding plc (BIRK)$123.3M0.37%2,865,895+290,493Added
First Horizon Corp. (FHN)$123.3M0.37%4,808,223-249,869Trimmed
Etsy Inc. (ETSY)$120.4M0.36%1,598,520+1,598,520New position
Millicom Intl Cellular S A (TIGO)$118.9M0.36%1,309,545-96,063Trimmed
Diebold Nixdorf, Inc. (DBD)$117.3M0.35%1,379,553-46,911Trimmed
Garrett Motion Inc. (GTX)$117.1M0.35%3,232,883-2,529,814Trimmed
Encompass Health Corp. (EHC)$116.4M0.35%1,151,085+347,934Added
Appfolio Inc. (APPF)$115.7M0.35%721,826+78,595Added
Marriott International Inc. (MAR)$111.5M0.34%300,872+216,241Added
National Bank Holdings Corp. (NBHC)$111.0M0.33%2,497,817+22,956Added
Chipotle Mexican Grill Inc. (CMG)$110.0M0.33%3,235,762-674,911Trimmed
Saia Inc. (SAIA)$109.1M0.33%259,020+88,875Added
Repligen Corp. (RGEN)$107.6M0.32%788,571+788,571New position
Freshpet, Inc. (FRPT)$107.1M0.32%1,810,994-2,191Trimmed
Jazz Pharmaceuticals plc (JAZZ)$105.3M0.32%436,893+366,010Added
Martin Marietta Materials Inc. (MLM)$104.9M0.32%181,902-90,490Trimmed
Knight-Swift Transportation Holdings Inc. (KNX)$103.6M0.31%1,330,047+386,761Added
Weatherford International plc (WFRD)$102.8M0.31%1,260,878+680,947Added
Globus Medical Inc. (GMED)$101.5M0.30%1,284,896-724,867Trimmed
Nu Holdings Ltd. (NU)$101.5M0.30%7,596,051-4,671,549Trimmed
Hudbay Minerals Inc. (HBM)$99.5M0.30%4,215,842+4,215,842New position

Every quarter it filed

What the fund reported and how many positions it held, each quarter since September 2024.

QuarterReported valuePositions
June 2026 quarter$33.3B403
March 2026 quarter$30.3B413
December 2025 quarter$35.9B413
September 2025 quarter$38.7B414
June 2025 quarter$37.7B417
March 2025 quarter$35.6B423
December 2024 quarter$40.9B433
September 2024 quarter$40.5B412
Every 13F fund · Fund holdings data