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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
+788.31%
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
PPL
376
PPL Corp
PPL
$26.7B
$476K ﹤0.01%
12,465
+315
+3% +$11.6K
ALLE icon
377
Allegion
ALLE
$14.4B
$469K ﹤0.01%
3,227
+80
+3% +$12.8K
REG icon
378
Regency Centers
REG
$14.1B
$464K ﹤0.01%
6,137
+156
+3% +$11.6K
RGLD icon
379
Royal Gold
RGLD
$19.5B
$457K ﹤0.01%
1,794
-769
-30% -$204K
JBHT icon
380
JB Hunt Transport Services
JBHT
$25.2B
$452K ﹤0.01%
2,131
+55
+3% +$11.7K
WEX icon
381
WEX
WEX
$6.31B
$448K ﹤0.01%
2,930
+73
+3% +$11.4K
DOV icon
382
Dover
DOV
$28.4B
$447K ﹤0.01%
2,142
-337
-14% -$72K
CACI icon
383
CACI
CACI
$14.2B
$407K ﹤0.01%
748
-75,220
-99% -$45.3M
HST icon
384
Host Hotels & Resorts
HST
$16B
$391K ﹤0.01%
20,421
+522
+3% +$9.96K
CCK icon
385
Crown Holdings
CCK
$13.1B
$385K ﹤0.01%
3,836
+95
+3% +$10.2K
JEF icon
386
Jefferies Financial Group
JEF
$13.1B
$365K ﹤0.01%
+8,835
New +$459K
BC icon
387
Brunswick
BC
$5.28B
$354K ﹤0.01%
4,865
+124
+3% +$10K
JBL icon
388
Jabil
JBL
$35.8B
$354K ﹤0.01%
1,332
+34
+3% +$8.56K
SMIN icon
389
iShares MSCI India Small-Cap ETF
SMIN
$776M
$353K ﹤0.01%
5,892
– –
LH icon
390
Labcorp
LH
$25.9B
$350K ﹤0.01%
1,311
+34
+3% +$9.21K
EXE
391
Expand Energy Corp
EXE
$21.5B
$346K ﹤0.01%
3,154
+81
+3% +$8.65K
SSB icon
392
SouthState Bank Corp
SSB
$10.5B
$346K ﹤0.01%
3,742
+87
+2% +$8.53K
COLB icon
393
Columbia Banking Systems
COLB
$8.84B
$344K ﹤0.01%
12,529
+297
+2% +$8.59K
DOC icon
394
Healthpeak Properties
DOC
$14.8B
$339K ﹤0.01%
20,641
+527
+3% +$9.03K
SHOP icon
395
Shopify
SHOP
$195B
$332K ﹤0.01%
2,795
-7,969
-74% -$1.05M
TAP icon
396
Molson Coors Class B
TAP
$8.09B
$327K ﹤0.01%
7,600
+193
+3% +$9.17K
PR
397
Permian Resources
PR
$16.9B
$306K ﹤0.01%
14,346
+365
+3% +$6.3K
GOOG icon
398
Alphabet (Google) Class C
GOOG
$4.32T
$294K ﹤0.01%
1,025
– –
ICLR icon
399
Icon
ICLR
$12.7B
$285K ﹤0.01%
2,577
+63
+3% +$8.61K
CHE icon
400
Chemed
CHE
$7.22B
$283K ﹤0.01%
748
-344,059
-100% -$147M
14 15
16
17 18

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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.