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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
NUMG icon
1651
Nuveen ESG Mid-Cap Growth ETF
NUMG
$370M
$44.4K ﹤0.01%
913
– –
PIE icon
1652
Invesco Dorsey Wright Emerging Markets Momentum ETF
PIE
$250M
$43.9K ﹤0.01%
1,800
– –
HLLY.WS
1653
DELISTED
Holley Inc Warrants
HLLY.WS
$43.9K ﹤0.01%
401,489
– –
EWG icon
1654
iShares MSCI Germany ETF
EWG
$1.67B
$42.7K ﹤0.01%
1,026
-2,546
-71% -$107K
SMOG icon
1655
VanEck Low Carbon Energy ETF
SMOG
$136M
$42.5K ﹤0.01%
334
– –
LPRO
1656
DELISTED
Open Lending Corp
LPRO
$42.2K ﹤0.01%
20,000
– –
DFJ icon
1657
WisdomTree Japan SmallCap Dividend Fund
DFJ
$402M
$41.5K ﹤0.01%
438
– –
SMMU icon
1658
PIMCO Short Term Municipal Bond Active Exchange-Traded Fund
SMMU
$1.17B
$41K ﹤0.01%
810
-810
-50% -$40.8K
XPH icon
1659
State Street SPDR S&P Pharmaceuticals ETF
XPH
$510M
$40.8K ﹤0.01%
851
– –
IFLN
1660
Invesco Bloomberg Enhanced Fallen Angels ETF
IFLN
$306M
$40.6K ﹤0.01%
2,185
– –
PIZ icon
1661
Invesco Dorsey Wright Developed Markets Momentum ETF
PIZ
$742M
$40.5K ﹤0.01%
850
– –
IRD
1662
Opus Genetics
IRD
$313M
$40.4K ﹤0.01%
24,466
– –
FCOM icon
1663
Fidelity MSCI Communication Services Index ETF
FCOM
$1.76B
$39.5K ﹤0.01%
557
– –
WIT icon
1664
Wipro
WIT
$19.3B
$39.3K ﹤0.01%
+14,924
New +$42K
BA.PRA
1665
Boeing Co 6.00% Series A Preferred Stock
BA.PRA
$8.19B
$39.1K ﹤0.01%
562
– –
SH icon
1666
ProShares Short S&P500
SH
$844M
$39K ﹤0.01%
1,054
-887
-46% -$34.2K
KSA icon
1667
iShares MSCI Saudi Arabia ETF
KSA
$624M
$38.9K ﹤0.01%
958
– –
CORP icon
1668
PIMCO Investment Grade Corporate Bond Index Exchange-Traded Fund
CORP
$1.58B
$38.4K ﹤0.01%
389
– –
CSD icon
1669
Invesco S&P Spin-Off ETF
CSD
$232M
$38.2K ﹤0.01%
410
– –
BBH icon
1670
VanEck Biotech ETF
BBH
$429M
$37.3K ﹤0.01%
225
-200
-47% -$32.6K
CNYA icon
1671
iShares MSCI China A ETF
CNYA
$208M
$36.8K ﹤0.01%
1,073
– –
SDS icon
1672
ProShares UltraShort S&P500
SDS
$370M
$36.1K ﹤0.01%
500
– –
FXU icon
1673
First Trust Utilities AlphaDEX Fund
FXU
$827M
$36.1K ﹤0.01%
794
+533
+204% +$23.5K
STPZ icon
1674
PIMCO 1-5 Year US TIPS Index Exchange-Traded Fund
STPZ
$524M
$34.9K ﹤0.01%
645
– –
VCLT icon
1675
Vanguard Long-Term Corporate Bond ETF
VCLT
$8.75B
$34.9K ﹤0.01%
449
-445
-50% -$33.8K
65 66
67
68 69

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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.