2026 Q1 Portfolio Activity
In 2026 Q1, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC maintained a portfolio of 460 distinct positions. The most significant new addition was ASTRAZENECA PLC, now representing 1.25% of the total fund value. They heavily accumulated shares in STERLING INFRASTRUCTURE INC, increasing the position by 684.0%. Conversely, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC completely exited their position in SEA LTD.
Position History
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Total Positions
460
Quarter
2026 Q1
Top Holding
TSM (6.2%)
Top 10 Concentration
30.6%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-50 of 460
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Full Holdings List — 2026 Q1
| Stock | History | Sector / Type | Port % | Prev % | Rank / Prev | Conviction | Change | % Change | Influence | Shares | Mkt Value | Avg Cost | Price Held | 1st Owned | Source | Source Date | Date Reported | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
TSM
TAIWAN SEMICOND...
|
Technology | 6.16% | 5.07% |
#1
1
Prev: #2
|
5.0 |
—
|
-467,070 | -7.8% |
P
S
|
5,518,260 | $1,865,444,875 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
NVDA
NVIDIA CORPORAT...
|
Technology | 5.15% | 5.53% |
#2
1
Prev: #1
|
4.1 |
—
|
-1,686,911 | -15.9% |
P
S
|
8,941,756 | $1,559,442,318 | 2021 Q2 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
AAPL
APPLE INC
|
Technology | 4.04% | 4.13% |
#3
1
Prev: #4
|
3.1 |
—
|
-631,895 | -11.6% |
P
S
|
4,812,433 | $1,221,347,410 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
MSFT
MICROSOFT CORP
|
Technology | 3.54% | 4.71% |
#4
1
Prev: #3
|
2.4 |
—
|
-593,520 | -17.0% |
P
S
|
2,896,782 | $1,072,301,833 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
GOOGL
ALPHABET INC
|
Communication Services | 2.38% | 2.75% |
#5
1
Prev: #6
|
1.5 |
—
|
-650,368 | -20.6% |
P
S
|
2,504,605 | $720,224,207 | 2015 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
AVGO
BROADCOM INC
|
Technology | 2.25% | 2.45% |
#6
1
Prev: #7
|
1.4 |
—
|
-335,053 | -13.2% |
P
S
|
2,201,558 | $681,404,288 | 2016 Q1 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
AMZN
AMAZON COM INC
|
Consumer Cyclical | 2.18% | 2.82% |
#7
2
Prev: #5
|
0.9 |
—
|
-1,223,374 | -27.9% |
P
S
|
3,163,629 | $658,889,012 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
META
META PLATFORMS ...
|
Communication Services | 1.92% | 2.19% |
#8
Prev: #8
|
1.3 |
—
|
-173,647 | -14.6% |
P
S
|
1,013,122 | $579,637,212 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
MA
MASTERCARD INCO...
|
Financial Services | 1.75% | 1.73% |
#9
Prev: #9
|
1.2 |
—
|
-24,296 | -2.2% |
P
S
|
1,060,651 | $529,964,838 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
AZNCF
ASTRAZENECA PLC
|
Unknown | 1.25% | — |
#10
Prev: #—
|
4.0 |
—
|
1,942,155 | — |
NEW
|
1,942,155 | $377,341,483 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
LIN
LINDE PLC
|
Basic Materials | 1.04% | 0.77% |
#11
12
Prev: #23
|
0.9 |
—
|
-7,132 | -1.1% |
P
S
|
636,338 | $315,470,927 | 2018 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
CG
CARLYLE GROUP I...
|
Financial Services | 1.01% | 1.18% |
#12
2
Prev: #10
|
0.9 |
—
|
-830,793 | -11.6% |
P
S
|
6,301,109 | $304,910,650 | 2022 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
COST
COSTCO WHOLESAL...
|
Consumer Defensive | 1.00% | 0.79% |
#13
8
Prev: #21
|
0.9 |
—
|
-26,000 | -7.9% |
P
S
|
302,468 | $301,388,189 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
ITUB
ITAU UNIBANCO H...
|
Preferred | 0.88% | 0.73% |
#14
12
Prev: #26
|
0.9 |
—
|
-4,867,055 | -13.3% |
P
S
|
31,684,708 | $265,626,612 | 2016 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
TWST
TWIST BIOSCIENC...
|
Healthcare | 0.83% | 0.53% |
#15
29
Prev: #44
|
0.8 |
—
|
-684,711 | -11.5% |
P
S
|
5,269,718 | $250,416,999 | 2020 Q1 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
NOW
SERVICENOW INC
|
Technology | 0.82% | 0.92% |
#16
3
Prev: #13
|
2.3 |
—
|
222,834 | 10.4% |
P
S
|
2,371,614 | $247,952,244 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
PRMB
PRIMO BRANDS CO...
|
Consumer Defensive | 0.81% | 0.58% |
#17
20
Prev: #37
|
0.8 |
—
|
428,772 | 3.4% |
P
S
|
13,056,192 | $245,848,095 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
MLI
MUELLER INDS IN...
|
Industrials | 0.77% | 0.57% |
#18
21
Prev: #39
|
2.3 |
—
|
329,823 | 18.5% |
P
S
|
2,109,729 | $233,757,973 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
INTU
INTUIT
|
Technology | 0.76% | 0.82% |
#19
1
Prev: #18
|
2.8 |
—
|
91,345 | 20.6% |
P
S
|
533,736 | $230,776,974 | 2017 Q2 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
MNST
MONSTER BEVERAG...
|
Consumer Defensive | 0.70% | 0.80% |
#20
1
Prev: #19
|
0.3 |
—
|
-826,002 | -22.0% |
P
S
|
2,935,247 | $212,687,998 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
AMD
ADVANCED MICRO ...
|
Technology | 0.70% | 0.80% |
#21
1
Prev: #20
|
0.3 |
—
|
-296,952 | -22.2% |
P
S
|
1,042,594 | $212,094,897 | 2019 Q2 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
BAP
CREDICORP LTD
|
Financial Services | 0.70% | 0.61% |
#22
11
Prev: #33
|
0.8 |
—
|
-144,723 | -18.9% |
P
S
|
622,690 | $211,203,994 | 2015 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
A
AGILENT TECHNOL...
|
Healthcare | 0.68% | 0.78% |
#23
1
Prev: #22
|
0.8 |
—
|
-267,245 | -13.0% |
P
S
|
1,795,764 | $204,681,180 | 2018 Q2 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
ORLY
OREILLY AUTOMOT...
|
Consumer Cyclical | 0.67% | 0.76% |
#24
1
Prev: #25
|
0.3 |
—
|
-771,473 | -25.9% |
P
S
|
2,210,034 | $204,008,239 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
BWXT
BWX TECHNOLOGIE...
|
Industrials | 0.66% | 0.53% |
#25
18
Prev: #43
|
0.8 |
—
|
-125,818 | -11.4% |
P
S
|
981,782 | $200,764,601 | 2016 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
TRU
TRANSUNION
|
Financial Services | 0.66% | 0.95% |
#26
15
Prev: #11
|
0.3 |
—
|
-1,074,308 | -27.1% |
P
S
|
2,891,187 | $200,041,262 | 2017 Q1 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
ONTO
ONTO INNOVATION...
|
Technology | 0.65% | 0.76% |
#27
3
Prev: #24
|
0.3 |
—
|
-762,374 | -44.2% |
P
S
|
964,213 | $197,731,160 | 2023 Q2 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
IDXX
IDEXX LABS INC
|
Healthcare | 0.65% | 0.83% |
#28
12
Prev: #16
|
0.3 |
—
|
-89,703 | -20.3% |
P
S
|
351,621 | $197,572,324 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
NXT
NEXTPOWER INC
|
Technology | 0.65% | 0.33% |
#29
54
Prev: #83
|
2.3 |
—
|
259,695 | 19.1% |
P
S
|
1,622,489 | $195,591,049 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
ARGX
ARGENX SE
|
Healthcare | 0.64% | 0.52% |
#30
15
Prev: #45
|
2.3 |
—
|
42,401 | 19.0% |
P
S
|
266,067 | $194,364,029 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
CAVA
CAVA GROUP INC
|
Consumer Cyclical | 0.64% | 0.40% |
#31
33
Prev: #64
|
0.8 |
—
|
-25,276 | -1.0% |
P
S
|
2,393,971 | $193,672,254 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
LSCC
LATTICE SEMICON...
|
Technology | 0.63% | 0.44% |
#32
23
Prev: #55
|
0.8 |
—
|
-81,540 | -3.8% |
P
S
|
2,043,720 | $189,575,467 | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
FFIV
F5 INC
|
Technology | 0.62% | 0.39% |
#33
34
Prev: #67
|
2.2 |
—
|
99,684 | 18.1% |
P
S
|
649,948 | $188,049,455 | 2017 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
AKAM
AKAMAI TECHNOLO...
|
Technology | 0.61% | — |
#34
Prev: #—
|
3.7 |
—
|
1,619,060 | — |
NEW
|
1,619,060 | $185,949,041 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
CCJ
CAMECO CORP
|
Energy | 0.60% | 0.51% |
#35
12
Prev: #47
|
0.7 |
—
|
-298,524 | -15.1% |
P
S
|
1,682,303 | $182,714,877 | 2018 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
UNH
UNITEDHEALTH GR...
|
Healthcare | 0.60% | 0.70% |
#36
8
Prev: #28
|
0.7 |
—
|
-88,980 | -11.7% |
P
S
|
673,263 | $182,178,239 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
MDGL
MADRIGAL PHARMA...
|
Healthcare | 0.59% | 0.58% |
#37
1
Prev: #38
|
0.7 |
—
|
-13,701 | -3.9% |
P
S
|
340,519 | $178,251,481 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
NU
NU HLDGS LTD
|
Financial Services | 0.58% | 0.87% |
#38
24
Prev: #14
|
0.2 |
—
|
-6,431,767 | -34.4% |
P
S
|
12,267,600 | $176,285,412 | 2023 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
GMED
GLOBUS MED INC
|
Healthcare | 0.57% | 0.61% |
#39
5
Prev: #34
|
0.2 |
—
|
-510,019 | -20.2% |
P
S
|
2,009,763 | $173,161,180 | 2018 Q2 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
CHRW
C H ROBINSON WO...
|
Industrials | 0.57% | 0.20% |
#40
85
Prev: #125
|
3.2 |
—
|
604,157 | 138.1% |
P
S
|
1,041,658 | $172,988,144 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
PSTG
EVERPURE INC
|
Technology | 0.56% | 0.70% |
#41
12
Prev: #29
|
0.2 |
—
|
-861,447 | -23.0% |
P
S
|
2,881,481 | $170,122,638 | 2018 Q1 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
SNOW
SNOWFLAKE INC
|
Technology | 0.56% | 0.82% |
#42
25
Prev: #17
|
0.7 |
—
|
-219,473 | -16.3% |
P
S
|
1,127,525 | $170,053,321 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
TLN
TALEN ENERGY CO...
|
Utilities | 0.55% | 0.60% |
#43
8
Prev: #35
|
0.7 |
—
|
-44,185 | -7.8% |
P
S
|
525,214 | $167,664,065 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
LOPE
GRAND CANYON ED...
|
Consumer Defensive | 0.55% | 0.21% |
#44
76
Prev: #120
|
3.2 |
—
|
526,594 | 116.2% |
P
S
|
979,734 | $166,584,172 | 2016 Q4 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
EG
EVEREST GROUP L...
|
Financial Services | 0.55% | 0.55% |
#45
5
Prev: #40
|
0.7 |
—
|
-78,135 | -13.4% |
P
S
|
506,166 | $165,440,357 | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
HALO
HALOZYME THERAP...
|
Healthcare | 0.54% | 0.35% |
#46
32
Prev: #78
|
2.7 |
—
|
683,019 | 37.1% |
P
S
|
2,525,975 | $163,253,764 | 2019 Q1 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
MLM
MARTIN MARIETTA...
|
Basic Materials | 0.53% | 0.47% |
#47
5
Prev: #52
|
0.7 |
—
|
2,189 | 0.8% |
P
S
|
272,392 | $160,351,723 | 2016 Q1 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
COHR
COHERENT CORP
|
Technology | 0.53% | 0.45% |
#48
5
Prev: #53
|
0.2 |
—
|
-204,923 | -23.5% |
P
S
|
668,137 | $159,156,915 | 2017 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
CW
CURTISS WRIGHT ...
|
Industrials | 0.52% | 0.43% |
#49
7
Prev: #56
|
0.7 |
—
|
-45,768 | -16.5% |
P
S
|
232,069 | $158,066,837 | 2015 Q3 | 13F Filing | 2026-03-31 | 2026-05-08 | |||
|
RRX
REGAL REXNORD C...
|
Industrials | 0.52% | 0.30% |
#50
45
Prev: #95
|
2.2 |
—
|
78,210 | 10.3% |
P
S
|
837,493 | $156,828,939 | 2021 Q2 | 13F Filing | 2026-03-31 | 2026-05-08 |
Showing 1-50 of 460 holdings