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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
+12.61%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
AUM
$36B
AUM Growth
+$2.85B
Cap. Flow
-$222M
Cap. Flow %
-0.62%
Top 10 Hldgs %
24.91%
Holding
1,911
New
111
Increased
662
Reduced
757
Closed
87

Top Buys

Rank Stock Value
1
GEV icon
GE Vernova
GEV
+$116M
2
BA icon
Boeing
BA
+$34M
3
CWAN
Clearwater Analytics
CWAN
+$31.2M
4
NVDA icon
NVIDIA
NVDA
+$27.5M
5
NET icon
Cloudflare
NET
+$26.2M

Top Sells

Rank Stock Value
1
XYZ
Block Inc
XYZ
+$79.4M
2
ZTS icon
Zoetis
ZTS
+$41.3M
3
ACN icon
Accenture
ACN
+$40.8M
4
IJH icon
iShares Core S&P Mid-Cap ETF
IJH
+$40.7M
5
UNH icon
UnitedHealth
UNH
+$36.4M

Sector Composition

Rank Sector Weight
1 Technology 27.47%
2 Financials 13.92%
3 Industrials 12.94%
4 Healthcare 11.51%
5 Consumer Discretionary 7.98%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PFFD icon
1601
Global X US Preferred ETF
PFFD
$2.17B
$51.4K ﹤0.01%
2,728
+2,651
+3,443% +$49.4K
GSUS icon
1602
Goldman Sachs MarketBeta US Equity ETF
GSUS
$3.29B
$51.3K ﹤0.01%
600
– –
IBTI icon
1603
iShares iBonds Dec 2028 Term Treasury ETF
IBTI
$1.92B
$51.1K ﹤0.01%
2,286
-210
-8% -$4.67K
RSPM icon
1604
Invesco S&P 500 Equal Weight Materials ETF
RSPM
$194M
$48.9K ﹤0.01%
1,510
– –
EQAL icon
1605
Invesco Russell 1000 Equal Weight ETF
EQAL
$838M
$48.4K ﹤0.01%
982
– –
HYS icon
1606
PIMCO 0-5 Year High Yield Corporate Bond Index Exchange-Traded Fund
HYS
$1.75B
$47.4K ﹤0.01%
499
+175
+54% +$16.3K
FNX icon
1607
First Trust Mid Cap Core AlphaDEX Fund
FNX
$1.41B
$47K ﹤0.01%
+409
New +$44.4K
FDD icon
1608
First Trust STOXX European Select Dividend Income Fund
FDD
$908M
$46.6K ﹤0.01%
+3,000
New +$43.7K
DVYE icon
1609
iShares Emerging Markets Dividend ETF
DVYE
$1.22B
$46.6K ﹤0.01%
1,625
– –
JETS icon
1610
US Global Jets ETF
JETS
$800M
$45.7K ﹤0.01%
1,991
+5
+0.3% +$106
BELFA icon
1611
Bel Fuse Inc Class A
BELFA
$3.37B
$44.9K ﹤0.01%
500
– –
NUMG icon
1612
Nuveen ESG Mid-Cap Growth ETF
NUMG
$367M
$44.2K ﹤0.01%
913
-242
-21% -$10.9K
EQWL icon
1613
Invesco S&P 100 Equal Weight ETF
EQWL
$2.77B
$44K ﹤0.01%
400
– –
HLLY icon
1614
Holley
HLLY
$384M
$43.8K ﹤0.01%
21,900
-2,350
-10% -$4.99K
SDS icon
1615
ProShares UltraShort S&P500
SDS
$390M
$41.6K ﹤0.01%
500
– –
IFLN
1616
Invesco Bloomberg Enhanced Fallen Angels ETF
IFLN
$307M
$40.3K ﹤0.01%
2,185
-2,800
-56% -$50.7K
BDSX icon
1617
Biodesix
BDSX
$248M
$39.8K ﹤0.01%
7,055
+850
+14% +$6.86K
SCHZ icon
1618
Schwab US Aggregate Bond ETF
SCHZ
$10.5B
$39.8K ﹤0.01%
1,712
+328
+24% +$7.53K
AWRE icon
1619
Aware
AWRE
$27.7M
$39.6K ﹤0.01%
20,964
– –
PIZ icon
1620
Invesco Dorsey Wright Developed Markets Momentum ETF
PIZ
$756M
$39.1K ﹤0.01%
850
-925
-52% -$39.1K
LPRO
1621
DELISTED
Open Lending Corp
LPRO
$38.8K ﹤0.01%
+20,000
New +$32.3K
BA.PRA
1622
Boeing Co 6.00% Series A Preferred Stock
BA.PRA
$8.27B
$38.2K ﹤0.01%
562
– –
CORP icon
1623
PIMCO Investment Grade Corporate Bond Index Exchange-Traded Fund
CORP
$1.58B
$37.9K ﹤0.01%
389
-95
-20% -$9.09K
LMBS icon
1624
First Trust Exchange-Traded Fund IV First Trust Low Duration Opportunities ETF
LMBS
$6.38B
$37.7K ﹤0.01%
766
-445
-37% -$21.8K
PIE icon
1625
Invesco Dorsey Wright Emerging Markets Momentum ETF
PIE
$250M
$37.7K ﹤0.01%
1,800
-1,950
-52% -$37K
63 64
65
66 67

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William Blair & Company's Q2 2025 Portfolio in Review

As of Q2 2025, William Blair & Company held 1,911 positions worth $36B, up 8.6% from $33.2B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company's Q2 2025 filing shows 111 new, 662 increased, 757 reduced and 87 closed positions. Its largest new stake was Affirm: 304,959 shares worth $21.1M. The largest sale was Block Inc, an estimated $79.4M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, up from 26% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q2 2025 buy was Affirm: 304,959 shares worth $21.1M.
  • William Blair & Company added most to GE Vernova in Q2 2025, an estimated $116M increase.
  • William Blair & Company's biggest Q2 2025 reduction was Block Inc, cutting an estimated $79.4M.
  • William Blair & Company fully exited Discover Financial Services in Q2 2025, selling an estimated $5.21M.
  • William Blair & Company's ten largest holdings make up 25% of its $36B portfolio in Q2 2025.
  • William Blair & Company opened 111 new positions and closed 87 in Q2 2025.
  • William Blair & Company's portfolio value rose 8.6% quarter-over-quarter to $36B.

Based on William Blair & Company's 13F filing for Q2 2025, filed 24 Jul 2025.