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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
+3.11%
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
$35.9B
AUM Growth
-$2.82B
Cap. Flow
-$3B
Cap. Flow %
-8.37%
Top 10 Hldgs %
32.55%
Holding
459
New
45
Increased
106
Reduced
259
Closed
46

Top Buys

Rank Stock Value
1
SNOW icon
Snowflake
SNOW
+$202M
2
ARGX icon
argenx
ARGX
+$191M
3
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$191M
4
HQY icon
HealthEquity
HQY
+$178M
5
FFIV icon
F5
FFIV
+$148M

Top Sells

Rank Stock Value
1
LRCX icon
Lam Research
LRCX
+$270M
2
CIEN icon
Ciena
CIEN
+$260M
3
UBER icon
Uber
UBER
+$233M
4
LYV icon
Live Nation Entertainment
LYV
+$229M
5
LRN icon
Stride
LRN
+$225M

Sector Composition

Rank Sector Weight
1 Technology 37.93%
2 Financials 12.94%
3 Healthcare 12.67%
4 Consumer Discretionary 10.8%
5 Industrials 9.43%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
DOV icon
376
Dover
DOV
$28B
$484K ﹤0.01%
2,479
-152
-6% -$27.7K
IREN icon
377
Iris Energy
IREN
$15.6B
$482K ﹤0.01%
+12,751
New +$658K
ICLR icon
378
Icon
ICLR
$12.9B
$458K ﹤0.01%
2,514
+321
+15% +$57.2K
ALSN icon
379
Allison Transmission
ALSN
$10.2B
$451K ﹤0.01%
4,607
-383
-8% -$33.6K
NI icon
380
NiSource
NI
$20.1B
$433K ﹤0.01%
10,368
-929
-8% -$39.7K
G icon
381
Genpact
G
$5.7B
$431K ﹤0.01%
9,211
-845
-8% -$36.5K
WEX icon
382
WEX
WEX
$6.48B
$426K ﹤0.01%
2,857
-260
-8% -$39.2K
PPL
383
PPL Corp
PPL
$26.7B
$425K ﹤0.01%
12,150
-1,221
-9% -$44K
TKR icon
384
Timken Company
TKR
$9.03B
$425K ﹤0.01%
5,046
-485
-9% -$38.6K
AXTA icon
385
Axalta
AXTA
$7.98B
$421K ﹤0.01%
13,034
-1,329
-9% -$39K
REG icon
386
Regency Centers
REG
$13.9B
$413K ﹤0.01%
5,981
-594
-9% -$41.6K
SMIN icon
387
iShares MSCI India Small-Cap ETF
SMIN
$771M
$412K ﹤0.01%
5,892
-7,200
-55% -$520K
JBHT icon
388
JB Hunt Transport Services
JBHT
$25.9B
$403K ﹤0.01%
2,076
-533
-20% -$91.5K
CCK icon
389
Crown Holdings
CCK
$13.1B
$385K ﹤0.01%
3,741
-340
-8% -$33.1K
HST icon
390
Host Hotels & Resorts
HST
$15.6B
$353K ﹤0.01%
19,899
-1,931
-9% -$33.3K
BC icon
391
Brunswick
BC
$5.21B
$352K ﹤0.01%
4,741
-436
-8% -$29.6K
ACN icon
392
Accenture
ACN
$110B
$346K ﹤0.01%
1,290
-99
-7% -$25.2K
TAP icon
393
Molson Coors Class B
TAP
$7.75B
$346K ﹤0.01%
7,407
-650
-8% -$30K
SSB icon
394
SouthState Bank Corp
SSB
$10.7B
$344K ﹤0.01%
3,655
+1,068
+41% +$98.9K
COLB icon
395
Columbia Banking Systems
COLB
$9.12B
$342K ﹤0.01%
12,232
-991,404
-99% -$26.8M
EXE
396
Expand Energy Corp
EXE
$22.3B
$339K ﹤0.01%
3,073
-257
-8% -$28.5K
DOC icon
397
Healthpeak Properties
DOC
$14.2B
$323K ﹤0.01%
20,114
-1,771
-8% -$31.2K
GOOG icon
398
Alphabet (Google) Class C
GOOG
$4.19T
$322K ﹤0.01%
+1,025
New +$294K
LH icon
399
Labcorp
LH
$26.2B
$320K ﹤0.01%
1,277
-107
-8% -$28.4K
JBL icon
400
Jabil
JBL
$38.4B
$296K ﹤0.01%
1,298
-138
-10% -$29.4K
14 15
16
17 18

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William Blair Investment Management's Q4 2025 Portfolio in Review

As of Q4 2025, William Blair Investment Management held 459 positions worth $35.9B, down 7.3% from $38.7B the previous quarter. Its ten largest holdings account for 33% of the portfolio.

William Blair Investment Management withdrew a net $3B in Q4 2025, closing 46 positions and reducing 259 holdings. Its most notable exit was Live Nation Entertainment, an estimated $229M position sold in full.

By sector, the portfolio is most concentrated in Technology at 38% of assets, down from 39% a quarter earlier, followed by Financials and Healthcare.

Against the trend, William Blair Investment Management opened a new position in argenx worth $188M.

  • William Blair Investment Management's largest Q4 2025 buy was argenx: 223,666 shares worth $188M.
  • William Blair Investment Management added most to Snowflake in Q4 2025, an estimated $202M increase.
  • William Blair Investment Management's biggest Q4 2025 reduction was Lam Research, cutting an estimated $270M.
  • William Blair Investment Management fully exited Live Nation Entertainment in Q4 2025, selling an estimated $229M.
  • William Blair Investment Management's ten largest holdings make up 33% of its $35.9B portfolio in Q4 2025.
  • William Blair Investment Management opened 45 new positions and closed 46 in Q4 2025.
  • William Blair Investment Management's portfolio value fell 7.3% quarter-over-quarter to $35.9B.

Based on William Blair Investment Management's 13F filing for Q4 2025, filed 9 Feb 2026.