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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $33.3B
1-Year Est. Return 44.76%
This Fund
S&P 500
This Quarter Est. Return
+10.81%
1 Year Est. Return
+44.76%
3 Year Est. Return
+140.8%
5 Year Est. Return
+166.51%
10 Year Est. Return
+978.6%
AUM
$38.7B
AUM Growth
+$994M
Cap. Flow
-$1.59B
Cap. Flow %
-4.12%
Top 10 Hldgs %
31.01%
Holding
462
New
45
Increased
110
Reduced
257
Closed
48

Top Buys

Rank Stock Value
1
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$445M
2
NU icon
Nu Holdings
NU
+$175M
3
BSY icon
Bentley Systems
BSY
+$161M
4
CAVA icon
CAVA Group
CAVA
+$143M
5
SNOW icon
Snowflake
SNOW
+$111M

Top Sells

Rank Stock Value
1
DDOG icon
Datadog
DDOG
+$298M
2
AMZN icon
Amazon
AMZN
+$222M
3
META icon
Meta Platforms (Facebook)
META
+$181M
4
TLN
Talen Energy Corp
TLN
+$152M
5
EPAM icon
EPAM Systems
EPAM
+$149M

Sector Composition

Rank Sector Weight
1 Technology 38.52%
2 Consumer Discretionary 12.99%
3 Financials 12.96%
4 Healthcare 10.56%
5 Industrials 9.02%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
UNH icon
26
UnitedHealth
UNH
$363B
$265M 0.69%
768,535
+84,394
+12% +$25.5M
PRMB
27
Primo Brands
PRMB
$8.55B
$262M 0.68%
11,834,384
+1,231,701
+12% +$31.9M
UBER icon
28
Uber
UBER
$156B
$259M 0.67%
2,644,874
-107,664
-4% -$10.1M
ONTO icon
29
Onto Innovation
ONTO
$20.4B
$256M 0.66%
1,981,761
+882,901
+80% +$94.5M
LIN icon
30
Linde
LIN
$223B
$255M 0.66%
537,411
-66,615
-11% -$31.5M
LRCX icon
31
Lam Research
LRCX
$408B
$247M 0.64%
1,843,616
-64,752
-3% -$6.86M
TYL icon
32
Tyler Technologies
TYL
$12.9B
$240M 0.62%
459,114
+100,640
+28% +$56.5M
NVT icon
33
nVent Electric
NVT
$27.6B
$237M 0.61%
2,400,379
-713,557
-23% -$62M
BWXT icon
34
BWX Technologies
BWXT
$15.5B
$231M 0.6%
1,255,310
-262,046
-17% -$42.2M
LYV icon
35
Live Nation Entertainment
LYV
$42.9B
$229M 0.59%
1,400,174
-224,841
-14% -$35.5M
EG icon
36
Everest Group
EG
$14B
$228M 0.59%
651,474
-34,295
-5% -$11.6M
LRN icon
37
Stride
LRN
$3.23B
$225M 0.58%
1,511,080
+410,029
+37% +$60.1M
INSM icon
38
Insmed
INSM
$29.3B
$224M 0.58%
1,555,057
-110,545
-7% -$13.5M
VEEV icon
39
Veeva Systems
VEEV
$38.1B
$223M 0.58%
748,644
+131,902
+21% +$37.1M
CCJ icon
40
Cameco
CCJ
$43.1B
$221M 0.57%
2,638,033
-1,231,258
-32% -$95.5M
BAP icon
41
Credicorp
BAP
$30B
$218M 0.56%
820,073
+342,308
+72% +$84.7M
ITUB icon
42
Itaú Unibanco
ITUB
$82.6B
$216M 0.56%
30,354,301
+197,485
+0.7% +$1.3M
RY icon
43
Royal Bank of Canada
RY
$295B
$211M 0.55%
1,433,452
+80,063
+6% +$11M
CPRT icon
44
Copart
CPRT
$26.7B
$209M 0.54%
4,651,474
+336,529
+8% +$15.9M
WAL icon
45
Western Alliance Bancorporation
WAL
$8.89B
$208M 0.54%
2,394,722
+81,386
+4% +$6.9M
BCO icon
46
Brink's
BCO
$4.68B
$207M 0.53%
1,769,867
-193,114
-10% -$20.2M
MNST icon
47
Monster Beverage
MNST
$89.4B
$202M 0.52%
5,999,436
-288,310
-5% -$9M
MLI icon
48
Mueller Industries
MLI
$15B
$202M 0.52%
3,989,750
-649,388
-14% -$29.8M
WAY
49
Waystar Holding Corp
WAY
$4.66B
$200M 0.52%
5,263,187
+23,822
+0.5% +$883K
SPOT icon
50
Spotify
SPOT
$102B
$197M 0.51%
282,324
-89,462
-24% -$62.6M
1
2
3 4 5

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William Blair Investment Management's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair Investment Management held 462 positions worth $38.7B, up 2.6% from $37.7B the previous quarter. Its ten largest holdings account for 31% of the portfolio.

William Blair Investment Management withdrew a net $1.59B in Q3 2025, closing 48 positions and reducing 257 holdings. Its most notable exit was EPAM Systems, an estimated $149M position sold in full.

By sector, the portfolio is most concentrated in Technology at 39% of assets, up from 36% a quarter earlier, followed by Consumer Discretionary and Financials.

Against the trend, William Blair Investment Management opened a new position in Bentley Systems worth $151M.

  • William Blair Investment Management's largest Q3 2025 buy was Bentley Systems: 2,931,296 shares worth $151M.
  • William Blair Investment Management added most to Alphabet (Google) Class A in Q3 2025, an estimated $445M increase.
  • William Blair Investment Management's biggest Q3 2025 reduction was Datadog, cutting an estimated $298M.
  • William Blair Investment Management fully exited EPAM Systems in Q3 2025, selling an estimated $149M.
  • William Blair Investment Management's ten largest holdings make up 31% of its $38.7B portfolio in Q3 2025.
  • William Blair Investment Management opened 45 new positions and closed 48 in Q3 2025.
  • William Blair Investment Management's portfolio value rose 2.6% quarter-over-quarter to $38.7B.

Based on William Blair Investment Management's 13F filing for Q3 2025, filed 12 Nov 2025.