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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
DES icon
1676
WisdomTree US SmallCap Dividend Fund
DES
$2.22B
$34.8K ﹤0.01%
1,034
– –
PZA icon
1677
Invesco National AMT-Free Municipal Bond ETF
PZA
$4.27B
$34.3K ﹤0.01%
1,486
+1,320
+795% +$29.6K
LMBS icon
1678
First Trust Exchange-Traded Fund IV First Trust Low Duration Opportunities ETF
LMBS
$6.39B
$32.7K ﹤0.01%
657
-109
-14% -$5.39K
FYX icon
1679
First Trust Small Cap Core AlphaDEX Fund
FYX
$1.41B
$32.7K ﹤0.01%
300
-458
-60% -$47.6K
OVID icon
1680
Ovid Therapeutics
OVID
$489M
$32.6K ﹤0.01%
25,089
+3,000
+14% +$2.6K
IMMP
1681
Immutep
IMMP
$56.5M
$32.5K ﹤0.01%
+18,569
New +$31.5K
VTWG icon
1682
Vanguard Russell 2000 Growth ETF
VTWG
$1.56B
$31.6K ﹤0.01%
135
– –
HYS icon
1683
PIMCO 0-5 Year High Yield Corporate Bond Index Exchange-Traded Fund
HYS
$1.77B
$31.4K ﹤0.01%
328
-171
-34% -$16.2K
XOP icon
1684
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
$3.68B
$30.9K ﹤0.01%
234
-55
-19% -$7.1K
BZFD icon
1685
BuzzFeed
BZFD
$92.5M
$28.9K ﹤0.01%
+17,000
New +$34.6K
XTL icon
1686
State Street SPDR S&P Telecom ETF
XTL
$558M
$28.8K ﹤0.01%
206
– –
PAWZ icon
1687
ProShares Pet Care ETF
PAWZ
$33.7M
$28K ﹤0.01%
500
– –
NFRA icon
1688
FlexShares STOXX Global Broad Infrastructure Index Fund
NFRA
$3.03B
$27.7K ﹤0.01%
441
+319
+261% +$19.8K
PSQ icon
1689
ProShares Short QQQ
PSQ
$642M
$27.7K ﹤0.01%
893
+3
+0.3% +$98
PIII icon
1690
P3 Health Partners
PIII
$38.9M
$27.7K ﹤0.01%
3,096
+666
+27% +$5.02K
VXX icon
1691
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$141M
$27.1K ﹤0.01%
818
+750
+1,103% +$29.7K
AAXJ icon
1692
iShares MSCI All Country Asia ex Japan ETF
AAXJ
$3.83B
$27K ﹤0.01%
296
– –
RNTX
1693
Rein Therapeutics
RNTX
$68.9M
$26.8K ﹤0.01%
23,393
-229
-1% -$291
OUSA icon
1694
ALPS O'Shares U.S. Quality Dividend ETF
OUSA
$758M
$26.6K ﹤0.01%
471
+2
+0.4% +$111
LGLV icon
1695
State Street SPDR US Large Cap Low Volatility Index ETF
LGLV
$1.23B
$26.2K ﹤0.01%
147
-176
-54% -$31K
DJD icon
1696
Invesco Dow Jones Industrial Average Dividend ETF
DJD
$497M
$26.2K ﹤0.01%
+474
New +$25.7K
SLS icon
1697
SELLAS Life Sciences
SLS
$2.38B
$25.8K ﹤0.01%
16,002
– –
SOCL icon
1698
Global X Social Media ETF
SOCL
$90.3M
$25.2K ﹤0.01%
415
– –
STXG icon
1699
Strive 1000 Growth ETF
STXG
$153M
$25K ﹤0.01%
+500
New +$23.9K
GEF.B icon
1700
Greif Class B
GEF.B
$4.24B
$24.6K ﹤0.01%
400
– –
66 67
68
69 70

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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.