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Portfolio (Quarterly) Guide ↗

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

· CIK 0001644956
13F Portfolio $30.3B AUM 413 positions Filed May 8, 2026 EDGAR ↗ ← All Funds
Q1 2026 Q4 2025 · All 47 New 150 Added 201 Reduced 47 Exited
Page 1 of 8  ·  150 positions
# Ticker Company Sector Shares Value ↓ % Port Chg Shares Chg % Period Price ① Since Period ①
1 NOW SERVICENOW INC Technology 2,371,614.0 $248.0M 0.82% +223K +10.4% $104.55 +9.6%
2 PRMB PRIMO BRANDS CORPORATION Consumer Defensive 13,056,192.0 $245.8M 0.81% +429K +3.4% $18.83 +23.2%
3 MLI MUELLER INDS INC Industrials 2,109,729.0 $233.8M 0.77% +330K +18.5% $110.80 +20.6%
4 INTU INTUIT Technology 533,736.0 $230.8M 0.76% +91K +20.6% $432.38 -29.5%
5 NXT NEXTPOWER INC Technology 1,622,489.0 $195.6M 0.65% +260K +19.1% $120.55 +3.0%
6 ARGX ARGENX SE Healthcare 266,067.0 $194.4M 0.64% +42K +19.0% $730.51 +20.4%
7 FFIV F5 INC Technology 649,948.0 $188.0M 0.62% +100K +18.1% $289.33 +36.6%
8 CHRW C H ROBINSON WORLDWIDE IN Industrials 1,041,658.0 $173.0M 0.57% +604K +138.1% $166.07 +13.4%
9 LOPE GRAND CANYON ED INC Consumer Defensive 979,734.0 $166.6M 0.55% +527K +116.2% $170.03 -12.4%
10 HALO HALOZYME THERAPEUTICS INC Healthcare 2,525,975.0 $163.3M 0.54% +683K +37.1% $64.63 +9.8%
11 MLM MARTIN MARIETTA MATLS INC Basic Materials 272,392.0 $160.4M 0.53% +2K +0.8% $588.68 -5.5%
12 RRX REGAL REXNORD CORPORATION Industrials 837,493.0 $156.8M 0.52% +78K +10.3% $187.26 +13.4%
13 STRL STERLING INFRASTRUCTURE INC Industrials 323,421.0 $131.7M 0.43% +282K +684.0% $407.27 +117.7%
14 TECH BIO-TECHNE CORP Healthcare 2,462,487.0 $128.7M 0.42% +64K +2.7% $52.26 +1.6%
15 CLH CLEAN HARBORS INC Industrials 443,098.0 $127.0M 0.42% +104K +30.6% $286.73 -2.5%
16 CMG CHIPOTLE MEXICAN GRILL INC Consumer Cyclical 3,910,673.0 $125.2M 0.41% +598K +18.0% $32.01 -7.7%
17 RS RELIANCE INC Basic Materials 403,487.0 $122.6M 0.41% +123K +43.9% $303.92 +30.1%
18 EXP EAGLE MATLS INC Basic Materials 630,392.0 $119.4M 0.40% +72K +12.8% $189.45 +10.0%
19 BSY BENTLEY SYS INC Technology 3,322,723.0 $116.7M 0.39% +708K +27.1% $35.12 -5.6%
20 TIGO MILLICOM INTL CELLULAR S A Communication Services 1,405,608.0 $105.3M 0.35% +1.3M +1022.9% $74.94 +12.3%
Page 1 of 8  ·  150 positions

Period Price is the implied market price on the last day of the reporting period, calculated as reported value ÷ shares held. It is not the fund's purchase price or cost basis — the fund may have initiated or added to the position at any point during the quarter at a different price. Since Period shows the price change from that quarter-end snapshot to today's last price — it reflects stock movement after the report date, not the fund's actual return.

Sector Allocation
Technology 36.8%
Industrials 12.9%
Healthcare 12.5%
Consumer Cyclical 9.9%
Financial Services 9.9%
Communication Services 5.1%
Consumer Defensive 4.4%
Basic Materials 4.3%
Energy 1.8%
Real Estate 1.3%