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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
DOL icon
1751
WisdomTree True Developed International Fund
DOL
$845M
$11.1K ﹤0.01%
179
– –
SLX icon
1752
VanEck Steel ETF
SLX
$175M
$11K ﹤0.01%
152
-23
-13% -$1.62K
IXP icon
1753
iShares Global Comm Services ETF
IXP
$561M
$10.5K ﹤0.01%
85
– –
GCAL
1754
Goldman Sachs Dynamic California Municipal Income ETF
GCAL
$177M
$10.4K ﹤0.01%
+205
New +$10.2K
IPAC icon
1755
iShares Core MSCI Pacific ETF
IPAC
$2.78B
$10.2K ﹤0.01%
139
– –
FSTA icon
1756
Fidelity MSCI Consumer Staples Index ETF
FSTA
$1.42B
$9.87K ﹤0.01%
198
– –
HEWJ icon
1757
iShares Currency Hedged MSCI Japan ETF
HEWJ
$763M
$9.85K ﹤0.01%
200
– –
QDF icon
1758
FlexShares Quality Dividend Index Fund
QDF
$2.28B
$9.85K ﹤0.01%
124
– –
TQQQ icon
1759
ProShares UltraPro QQQ
TQQQ
$37.4B
$9.54K ﹤0.01%
184
-50
-21% -$2.28K
MXI icon
1760
iShares Global Materials ETF
MXI
$361M
$9.25K ﹤0.01%
100
-200
-67% -$17.7K
GVI icon
1761
iShares Intermediate Government/Credit Bond ETF
GVI
$3.79B
$9.24K ﹤0.01%
86
-454
-84% -$48.5K
INTS icon
1762
Intensity Therapeutics
INTS
$11.2M
$9.18K ﹤0.01%
1,512
– –
PBR.A icon
1763
Petrobras Class A
PBR.A
$103B
$9.08K ﹤0.01%
+768
New +$8.88K
CMBM
1764
DELISTED
Cambium Networks
CMBM
$8.94K ﹤0.01%
10,000
– –
CUT icon
1765
Invesco MSCI Global Timber ETF
CUT
$33.4M
$8.87K ﹤0.01%
300
– –
KBWP icon
1766
Invesco KBW Property & Casualty Insurance ETF
KBWP
$266M
$8.66K ﹤0.01%
70
– –
SPMB icon
1767
State Street SPDR Portfolio Mortgage Backed Bond ETF
SPMB
$7.05B
$8.6K ﹤0.01%
383
– –
QABA icon
1768
First Trust NASDAQ ABA Community Bank Index Fund
QABA
$94.4M
$8.42K ﹤0.01%
150
– –
XTN icon
1769
State Street SPDR S&P Transportation ETF
XTN
$392M
$8.38K ﹤0.01%
100
– –
SPEU icon
1770
State Street SPDR Portfolio Europe ETF
SPEU
$742M
$8.33K ﹤0.01%
167
– –
SGOV icon
1771
iShares 0-3 Month Treasury Bond ETF
SGOV
$101B
$8.17K ﹤0.01%
81
+1
+1% +$101
ELD icon
1772
WisdomTree Emerging Markets Local Debt Fund
ELD
$143M
$8.13K ﹤0.01%
283
+2
+0.7% +$57
ANGL icon
1773
VanEck Fallen Angel High Yield Bond ETF
ANGL
$3.11B
$7.91K ﹤0.01%
266
+16
+6% +$469
XHS icon
1774
State Street SPDR S&P Health Care Services ETF
XHS
$207M
$7.62K ﹤0.01%
75
– –
EEMS icon
1775
iShares MSCI Emerging Markets Small-Cap ETF
EEMS
$379M
$7.47K ﹤0.01%
110
-390
-78% -$25.8K
69 70
71
72 73

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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.