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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
TMCI icon
1601
Treace Medical Concepts
TMCI
$309M
$67.6K ﹤0.01%
10,080
– –
HTZ icon
1602
Hertz
HTZ
$998M
$67.5K ﹤0.01%
9,932
– –
IVOL icon
1603
Quadratic Interest Rate Volatility and Inflation Hedge ETF
IVOL
$270M
$67.3K ﹤0.01%
3,490
– –
EWA icon
1604
iShares MSCI Australia ETF
EWA
$1.46B
$66.1K ﹤0.01%
2,448
– –
IGE icon
1605
iShares North American Natural Resources ETF
IGE
$786M
$64.4K ﹤0.01%
1,312
+3
+0.2% +$139
DGRS icon
1606
WisdomTree Trust WisdomTree US SmallCap Quality Dividend Growth Fund
DGRS
$414M
$63.5K ﹤0.01%
1,270
– –
SLI
1607
Standard Lithium
SLI
$594M
$62.3K ﹤0.01%
+18,500
New +$51.7K
SPYX icon
1608
State Street SPDR S&P 500 Fossil Fuel Reserves Free ETF
SPYX
$2.87B
$61.9K ﹤0.01%
1,128
– –
EWH icon
1609
iShares MSCI Hong Kong ETF
EWH
$1.21B
$60.9K ﹤0.01%
2,826
-70
-2% -$1.47K
TALK icon
1610
Talkspace
TALK
$869M
$60.5K ﹤0.01%
21,920
– –
IDU icon
1611
iShares US Utilities ETF
IDU
$1.37B
$60.2K ﹤0.01%
543
– –
AIVI icon
1612
WisdomTree International AI Enhanced Value Fund
AIVI
$63.1M
$60.1K ﹤0.01%
1,210
– –
GBF icon
1613
iShares Government/Credit Bond ETF
GBF
$128M
$59.8K ﹤0.01%
568
-142
-20% -$14.8K
LYG icon
1614
Lloyds Banking Group
LYG
$89.8B
$59.7K ﹤0.01%
13,154
-1,545
-11% -$6.75K
ITEQ icon
1615
Amplify BlueStar Israel Technology ETF
ITEQ
$118M
$58.6K ﹤0.01%
1,000
– –
BELFA icon
1616
Bel Fuse Inc Class A
BELFA
$3.43B
$58.2K ﹤0.01%
500
– –
ISCG icon
1617
iShares Morningstar Small-Cap Growth ETF
ISCG
$1.02B
$57.7K ﹤0.01%
1,062
– –
NURE icon
1618
Nuveen Short-Term REIT ETF
NURE
$34.8M
$57.6K ﹤0.01%
2,000
– –
FNCL icon
1619
Fidelity MSCI Financials Index ETF
FNCL
$2.42B
$57.4K ﹤0.01%
752
– –
LRGF icon
1620
iShares US Equity Factor ETF
LRGF
$3.71B
$57.4K ﹤0.01%
831
-60
-7% -$3.99K
XSMO icon
1621
Invesco S&P SmallCap Momentum ETF
XSMO
$3.13B
$56.9K ﹤0.01%
774
+767
+10,957% +$54.2K
IXG icon
1622
iShares Global Financials ETF
IXG
$698M
$56.9K ﹤0.01%
488
+258
+112% +$29.3K
BBUS icon
1623
JPMorgan BetaBuilders US Equity ETF
BBUS
$9.22B
$56.3K ﹤0.01%
467
– –
TBF icon
1624
ProShares Short 20+ Year Treasury ETF
TBF
$106M
$55.7K ﹤0.01%
2,350
– –
TLH icon
1625
iShares 10-20 Year Treasury Bond ETF
TLH
$10.8B
$55.7K ﹤0.01%
541
-196
-27% -$19.8K
63 64
65
66 67

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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.