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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
MMSI icon
126
Merit Medical Systems
MMSI
$5.44B
$71.9M 0.19%
863,996
+124,396
+17% +$10.8M
CPNG icon
127
Coupang
CPNG
$29.3B
$71M 0.18%
2,205,332
+1,177,875
+115% +$35.6M
VCEL icon
128
Vericel Corp
VCEL
$2.29B
$69.6M 0.18%
2,210,929
+1,048,864
+90% +$37.7M
ASO icon
129
Academy Sports + Outdoors
ASO
$3.05B
$66.3M 0.17%
1,326,270
-113,762
-8% -$5.81M
RS icon
130
Reliance Steel & Aluminium
RS
$21.8B
$63.1M 0.16%
224,803
-5,759
-2% -$1.73M
TGLS icon
131
Tecnoglass Holdings Inc.
TGLS
$1.86B
$62.7M 0.16%
937,463
+20,071
+2% +$1.48M
ACGL icon
132
Arch Capital
ACGL
$33.2B
$62.5M 0.16%
689,145
-63,179
-8% -$5.67M
AGYS icon
133
Agilysys
AGYS
$3.02B
$59.6M 0.15%
566,222
+51,632
+10% +$5.71M
RRX icon
134
Regal Rexnord
RRX
$11.5B
$57.8M 0.15%
+403,004
New +$59.4M
IBN icon
135
ICICI Bank
IBN
$107B
$57.4M 0.15%
1,897,433
-1,570,054
-45% -$51.3M
WFRD icon
136
Weatherford International
WFRD
$6.64B
$56.3M 0.15%
822,117
+74,155
+10% +$4.41M
LAUR icon
137
Laureate Education
LAUR
$5.1B
$54.9M 0.14%
+1,739,350
New +$45.6M
MOD icon
138
Modine Manufacturing
MOD
$10.6B
$54.2M 0.14%
380,925
+141,125
+59% +$18M
RUSHA icon
139
Rush Enterprises Class A
RUSHA
$9.41B
$53.1M 0.14%
993,667
-56,928
-5% -$3.17M
FOXF icon
140
Fox Factory Holding Corp
FOXF
$913M
$52.3M 0.14%
2,151,661
-329,554
-13% -$9.28M
GOGO icon
141
Gogo Inc
GOGO
$383M
$52.1M 0.13%
6,067,663
+393,830
+7% +$4.99M
TSEM icon
142
Tower Semiconductor
TSEM
$29.5B
$50.8M 0.13%
702,349
-50,655
-7% -$2.77M
ABCB icon
143
Ameris Bancorp
ABCB
$5.95B
$48.2M 0.12%
657,531
-39,830
-6% -$2.8M
AIN icon
144
Albany International
AIN
$1.81B
$46.7M 0.12%
876,455
+174,023
+25% +$11M
BANR icon
145
Banner Corp
BANR
$2.5B
$46.5M 0.12%
709,665
+84,283
+13% +$5.55M
KWR icon
146
Quaker Houghton
KWR
$2.91B
$46.3M 0.12%
+351,660
New +$46.3M
CACI icon
147
CACI
CACI
$15B
$46.1M 0.12%
92,523
-18,098
-16% -$8.75M
RSI icon
148
Rush Street Interactive
RSI
$2.81B
$44.6M 0.12%
2,179,776
-495,825
-19% -$9.35M
LITE icon
149
Lumentum
LITE
$72.5B
$44.6M 0.12%
274,124
-85,574
-24% -$10.7M
CCEP icon
150
Coca-Cola Europacific Partners
CCEP
$47.3B
$44.5M 0.12%
492,244
-19,031
-4% -$1.77M
4 5
6
7 8

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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.