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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
BCS icon
351
Barclays
BCS
$94.4B
$2.69M 0.01%
105,592
+30,099
+40% +$667K
IWO icon
352
iShares Russell 2000 Growth ETF
IWO
$15B
$2.44M 0.01%
7,560
-28,600
-79% -$9.3M
IHG icon
353
InterContinental Hotels
IHG
$23.9B
$2.41M 0.01%
+17,146
New +$2.23M
SMFG icon
354
Sumitomo Mitsui Financial
SMFG
$166B
$2.41M 0.01%
124,444
-6,649
-5% -$115K
ODD icon
355
ODDITY Tech
ODD
$595M
$2.4M 0.01%
59,683
-27,062
-31% -$1.22M
INDA icon
356
iShares MSCI India ETF
INDA
$6.58B
$2.26M 0.01%
41,900
+4,500
+12% +$242K
BBVA icon
357
Banco Bilbao Vizcaya Argentaria
BBVA
$157B
$2.22M 0.01%
95,322
-76,502
-45% -$1.6M
ELF icon
358
e.l.f. Beauty
ELF
$5.47B
$2.12M 0.01%
27,837
-858
-3% -$84.5K
SAP icon
359
SAP
SAP
$236B
$2.04M 0.01%
8,417
-1,098
-12% -$280K
RY icon
360
Royal Bank of Canada
RY
$297B
$1.98M 0.01%
11,617
-1,421,835
-99% -$218M
SHOP icon
361
Shopify
SHOP
$194B
$1.73M ﹤0.01%
10,764
-576
-5% -$92.5K
BABA icon
362
Alibaba
BABA
$300B
$1.62M ﹤0.01%
+11,067
New +$1.8M
TCOM icon
363
Trip.com Group
TCOM
$28.7B
$1.59M ﹤0.01%
22,142
-1,145
-5% -$81.9K
GFI icon
364
Gold Fields
GFI
$36.4B
$1.12M ﹤0.01%
+25,676
New +$1.07M
CSGS
365
DELISTED
CSG Systems International
CSGS
$979K ﹤0.01%
12,766
-376,649
-97% -$27.8M
EPI icon
366
WisdomTree India Earnings Fund ETF
EPI
$2.04B
$972K ﹤0.01%
21,000
– –
NTES icon
367
NetEase
NTES
$79.5B
$968K ﹤0.01%
7,037
+4,426
+170% +$628K
CTVA icon
368
Corteva
CTVA
$50.4B
$960K ﹤0.01%
14,319
-2,234
-13% -$144K
APO icon
369
Apollo Global Management
APO
$81.9B
$925K ﹤0.01%
6,391
-206
-3% -$27.4K
RELX icon
370
RELX
RELX
$60.2B
$818K ﹤0.01%
20,233
-1,077
-5% -$46K
DDOG icon
371
Datadog
DDOG
$86.5B
$778K ﹤0.01%
5,721
+1,637
+40% +$259K
IWN icon
372
iShares Russell 2000 Value ETF
IWN
$14.6B
$692K ﹤0.01%
+3,821
New +$686K
RGLD icon
373
Royal Gold
RGLD
$19.7B
$570K ﹤0.01%
2,563
-228
-8% -$45.2K
ALLE icon
374
Allegion
ALLE
$14.1B
$501K ﹤0.01%
3,147
-281
-8% -$46.8K
FLEX icon
375
Flex
FLEX
$46B
$499K ﹤0.01%
8,262
-622
-7% -$38.4K
13 14
15
16 17

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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.