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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $30.3B
1-Year Est. Return 33.75%
This Fund
S&P 500
This Quarter Est. Return
-0.1%
1 Year Est. Return
+33.75%
3 Year Est. Return
+108.55%
5 Year Est. Return
+126.9%
10 Year Est. Return
+771.69%
AUM
$30.3B
AUM Growth
-$5.59B
Cap. Flow
-$4.09B
Cap. Flow %
-13.52%
Top 10 Hldgs %
30.62%
Holding
459
New
46
Increased
157
Reduced
205
Closed
46

Top Buys

Rank Stock Value
1
AZN icon
AstraZeneca
AZN
+$370M
2
AKAM icon
Akamai
AKAM
+$162M
3
BWA icon
BorgWarner
BWA
+$152M
4
APH icon
Amphenol
APH
+$152M
5
SYNA icon
Synaptics
SYNA
+$129M

Top Sells

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$309M
2
SE icon
Sea Limited
SE
+$302M
3
AMZN icon
Amazon
AMZN
+$269M
4
MSFT icon
Microsoft
MSFT
+$248M
5
CIEN icon
Ciena
CIEN
+$214M

Sector Composition

Rank Sector Weight
1 Technology 36.13%
2 Healthcare 12.59%
3 Industrials 11.81%
4 Financials 11.55%
5 Consumer Discretionary 10.11%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VIST icon
151
Vista Energy
VIST
$7.13B
$42M 0.14%
+556,283
New +$32.4M
PDFS icon
152
PDF Solutions
PDFS
$2.14B
$41.1M 0.14%
1,255,559
-102,922
-8% -$3.36M
SBCF icon
153
Seacoast Banking Corp of Florida
SBCF
$3.3B
$40.2M 0.13%
1,327,206
+44,671
+3% +$1.44M
RVLV icon
154
Revolve Group
RVLV
$1.78B
$39.9M 0.13%
1,766,423
-381,702
-18% -$10M
MTDR icon
155
Matador Resources
MTDR
$6.68B
$39.4M 0.13%
622,880
+206,572
+50% +$10.3M
ESTA icon
156
Establishment Labs
ESTA
$2.72B
$39.1M 0.13%
688,927
+49,137
+8% +$3.36M
CCEP icon
157
Coca-Cola Europacific Partners
CCEP
$46.5B
$38.6M 0.13%
426,094
-21,754
-5% -$2.09M
XPRO icon
158
Expro Ltd
XPRO
$1.87B
$38.4M 0.13%
2,204,291
+68,752
+3% +$1.13M
EBC icon
159
Eastern Bankshares
EBC
$4.94B
$38.3M 0.13%
1,958,155
+64,227
+3% +$1.28M
FBK icon
160
FB Financial Corp
FBK
$3B
$37.4M 0.12%
720,893
+237,693
+49% +$13.4M
USLM icon
161
United States Lime & Minerals
USLM
$3.01B
$37.4M 0.12%
286,260
+13,403
+5% +$1.61M
HWC icon
162
Hancock Whitney
HWC
$6.37B
$36.1M 0.12%
566,948
-67,520
-11% -$4.52M
IWF icon
163
iShares Russell 1000 Growth ETF
IWF
$123B
$36M 0.12%
337,700
-107,656
-24% -$12.2M
RNST icon
164
Renasant Corp
RNST
$4.03B
$35.4M 0.12%
980,820
+32,661
+3% +$1.23M
WH icon
165
Wyndham Hotels & Resorts
WH
$5.73B
$35.4M 0.12%
435,565
+156,191
+56% +$12.2M
AUGO
166
Aura Minerals Inc
AUGO
$4.19B
$34.9M 0.12%
428,060
-68,243
-14% -$4.78M
BCO icon
167
Brink's
BCO
$4.95B
$34.5M 0.11%
333,287
-1,211,354
-78% -$145M
AVT icon
168
Avnet
AVT
$7.03B
$34.3M 0.11%
556,770
+17,929
+3% +$1.07M
THG icon
169
Hanover Insurance
THG
$7.46B
$33.9M 0.11%
195,760
+46,541
+31% +$8.09M
HUBG icon
170
HUB Group
HUBG
$3.13B
$33.4M 0.11%
925,602
+299,708
+48% +$12.7M
VVX icon
171
V2X
VVX
$2.37B
$33.3M 0.11%
486,480
+15,634
+3% +$1.06M
BKV
172
BKV Corp
BKV
$2.84B
$32.9M 0.11%
1,153,767
+52,381
+5% +$1.52M
SILA
173
DELISTED
Sila Realty Trust
SILA
$32.9M 0.11%
1,387,324
+407,144
+42% +$9.98M
KN icon
174
Knowles
KN
$3.01B
$32.7M 0.11%
1,274,700
+41,354
+3% +$1.05M
PBF icon
175
PBF Energy
PBF
$7.42B
$32.7M 0.11%
686,814
-159,240
-19% -$5.97M
5 6
7
8 9

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William Blair Investment Management's Q1 2026 Portfolio in Review

As of Q1 2026, William Blair Investment Management held 459 positions worth $30.3B, down 16% from $35.9B the previous quarter. Its ten largest holdings account for 31% of the portfolio.

William Blair Investment Management withdrew a net $4.09B in Q1 2026, closing 46 positions and reducing 205 holdings. Its most notable exit was Sea Limited, an estimated $302M position sold in full.

By sector, the portfolio is most concentrated in Technology at 36% of assets, down from 38% a quarter earlier, followed by Healthcare and Industrials.

Against the trend, William Blair Investment Management opened a new position in Akamai worth $186M.

  • William Blair Investment Management's largest Q1 2026 buy was Akamai: 1,619,060 shares worth $186M.
  • William Blair Investment Management added most to AstraZeneca in Q1 2026, an estimated $370M increase.
  • William Blair Investment Management's biggest Q1 2026 reduction was NVIDIA, cutting an estimated $309M.
  • William Blair Investment Management fully exited Sea Limited in Q1 2026, selling an estimated $302M.
  • William Blair Investment Management's ten largest holdings make up 31% of its $30.3B portfolio in Q1 2026.
  • William Blair Investment Management opened 46 new positions and closed 46 in Q1 2026.
  • William Blair Investment Management's portfolio value fell 16% quarter-over-quarter to $30.3B.

Based on William Blair Investment Management's 13F filing for Q1 2026, filed 8 May 2026.