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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+7.16%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$37.6B
AUM Growth
+$1.57B
Cap. Flow
-$160M
Cap. Flow %
-0.43%
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75

Top Buys

Rank Stock Value
1
META icon
Meta Platforms (Facebook)
META
+$76.1M
2
APP icon
Applovin
APP
+$75.3M
3
NOW icon
ServiceNow
NOW
+$66.6M
4
CWAN
Clearwater Analytics
CWAN
+$65.8M
5
FANG icon
Diamondback Energy
FANG
+$30.7M

Top Sells

Rank Stock Value
1
CYBR
CyberArk
CYBR
+$70.7M
2
ADBE icon
Adobe
ADBE
+$61.7M
3
MSFT icon
Microsoft
MSFT
+$45.7M
4
WDAY icon
Workday
WDAY
+$42.6M
5
POOL icon
Pool Corp
POOL
+$41.7M

Sector Composition

Rank Sector Weight
1 Technology 27.36%
2 Financials 13.36%
3 Industrials 12.59%
4 Healthcare 10.97%
5 Consumer Discretionary 7.45%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
STR
1901
DELISTED
Sitio Royalties
STR
– –
-82,590
Closed -$1.52M
TAK icon
1902
Takeda Pharmaceutical
TAK
$55.6B
– –
-10,306
Closed -$159K
TCMD icon
1903
Tactile Systems Technology
TCMD
$555M
– –
-92,793
Closed -$941K
THS
1904
DELISTED
Treehouse Foods
THS
– –
-48,234
Closed -$937K
TIPX icon
1905
State Street SPDR Bloomberg 1-10 Year TIPS ETF
TIPX
$2.04B
– –
-535
Closed -$10.2K
TRI icon
1906
Thomson Reuters
TRI
$44.5B
– –
-1,984
Closed -$405K
UPST icon
1907
Upstart Holdings
UPST
$2.83B
– –
-3,600
Closed -$233K
AD
1908
Array Digital Infrastructure
AD
$3.04B
– –
-3,500
Closed -$224K
VNRX icon
1909
VolitionRx Ltd
VNRX
$8.05M
– –
-2,000
Closed -$30.4K
WBA
1910
DELISTED
Walgreens Boots Alliance
WBA
– –
-159,654
Closed -$1.83M
WHR icon
1911
Whirlpool
WHR
$2.79B
– –
-2,139
Closed -$217K
WOLF icon
1912
Wolfspeed
WOLF
$1.65B
– –
-12,830
Closed -$5.12K
WYNN icon
1913
Wynn Resorts
WYNN
$10.6B
– –
-2,907
Closed -$272K
EXE
1914
Expand Energy Corp
EXE
$22.3B
– –
-2,491
Closed -$291K
TLX
1915
Telix Pharmaceuticals
TLX
$4.06B
– –
-13,500
Closed -$217K
73 74 75 76
77

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William Blair & Company's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
  • William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
  • William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
  • William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
  • William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
  • William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
  • William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.

Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.