We are live on
!
Find out more
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
(-16%)
Cap. Flow
-$4.09B
Cap. Flow
% of AUM
-13.52%
Top 10 Holdings %
Top 10 Hldgs %
30.62%
Holding
459
New
46
Increased
157
Reduced
205
Closed
46
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
AstraZeneca
AZN
|
+$370M |
| 2 |
Akamai
AKAM
|
+$162M |
| 3 |
BorgWarner
BWA
|
+$152M |
| 4 |
Amphenol
APH
|
+$152M |
| 5 |
Synaptics
SYNA
|
+$129M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$309M |
| 2 |
Sea Limited
SE
|
+$302M |
| 3 |
Amazon
AMZN
|
+$269M |
| 4 |
Microsoft
MSFT
|
+$248M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
201
Banc of California
BANC
$3.27B
| $27.8M | 0.09% |
1,583,477
-733,886
| -32% | -$14M |
|
202
Americold
COLD
$4.54B
| $27.8M | 0.09% |
2,424,647
-447,914
| -16% | -$5.61M |
|
203
Marriott International
MAR
$96.6B
| $27.7M | 0.09% |
+84,631
| New | +$27.8M |
|
204
Huron Consulting
HURN
$1.86B
| $27.6M | 0.09% |
216,313
+21,925
| +11% | +$3.3M |
|
205
Simply Good Foods
SMPL
$980M
| $27.4M | 0.09% |
1,910,640
-214,000
| -10% | -$3.69M |
|
206
Matsons
MATX
$6.72B
| $27.4M | 0.09% |
167,129
+5,569
| +3% | +$866K |
|
207
ICICI Bank
IBN
$107B
| $27M | 0.09% |
1,041,180
-564,661
| -35% | -$16.6M |
|
208
Steven Madden
SHOO
$3.17B
| $26.9M | 0.09% |
794,137
+137,138
| +21% | +$5.31M |
|
|
TPH
209
DELISTED
Tri Pointe Homes
TPH
| $26.8M | 0.09% |
574,030
-283,196
| -33% | -$11.5M |
|
210
Eli Lilly
LLY
$1.05T
| $26.7M | 0.09% |
29,051
-2,965
| -9% | -$3.01M |
|
211
Cathay General Bancorp
CATY
$4.2B
| $26.6M | 0.09% |
+533,448
| New | +$26.9M |
|
212
i3 Verticals
IIIV
$405M
| $26.3M | 0.09% |
1,176,960
+790,575
| +205% | +$18.4M |
|
213
Impinj
PI
$4.21B
| $26.3M | 0.09% |
256,211
+44,208
| +21% | +$5.88M |
|
214
Albany International
AIN
$2.11B
| $26.2M | 0.09% |
502,015
+18,080
| +4% | +$1.01M |
|
215
Kulicke & Soffa
KLIC
$5.09B
| $26.2M | 0.09% |
398,036
-233,981
| -37% | -$14.9M |
|
216
Essent Group
ESNT
$6.15B
| $26M | 0.09% |
444,909
+14,460
| +3% | +$883K |
|
217
WillScot Mobile Mini Holdings
WSC
$4.93B
| $25.9M | 0.09% |
1,494,201
-1,155,226
| -44% | -$23.6M |
|
218
Integer Holdings
ITGR
$3.24B
| $25.7M | 0.09% |
292,601
-175,776
| -38% | -$15M |
|
219
Donnelley Financial Solutions
DFIN
$1.25B
| $25.7M | 0.09% |
545,484
+26,651
| +5% | +$1.31M |
|
220
Jones Lang LaSalle
JLL
$15.3B
| $25.4M | 0.08% |
83,499
-50,454
| -38% | -$16.3M |
|
221
Hawkins
HWKN
$3.02B
| $25.4M | 0.08% |
165,269
+30,830
| +23% | +$4.51M |
|
222
Zeta Global
ZETA
$5.4B
| $25.4M | 0.08% |
1,594,426
+76,993
| +5% | +$1.43M |
|
223
ANI Pharmaceuticals
ANIP
$1.8B
| $25.2M | 0.08% |
327,276
+10,583
| +3% | +$826K |
|
224
Banner Corp
BANR
$2.42B
| $25.1M | 0.08% |
413,966
-250,172
| -38% | -$15.5M |
|
225
Adtran
ADTN
$944M
| $25M | 0.08% |
1,989,530
-489,091
| -20% | -$4.96M |
|
Similar funds
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.