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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
+1.73%
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
$37.3B
AUM Growth
-$310M
Cap. Flow
-$212M
Cap. Flow %
-0.57%
Top 10 Hldgs %
27.41%
Holding
1,963
New
120
Increased
759
Reduced
753
Closed
96

Top Buys

Rank Stock Value
1
BWXT icon
BWX Technologies
BWXT
+$46.6M
2
META icon
Meta Platforms (Facebook)
META
+$38.3M
3
NOW icon
ServiceNow
NOW
+$37.6M
4
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$32.4M
5
GLD icon
SPDR Gold Trust
GLD
+$29.4M

Top Sells

Rank Stock Value
1
FISV
Fiserv Inc
FISV
+$114M
2
CSGP icon
CoStar Group
CSGP
+$78.3M
3
CWAN
Clearwater Analytics
CWAN
+$75.3M
4
POOL icon
Pool Corp
POOL
+$54M
5
ZTS icon
Zoetis
ZTS
+$51.3M

Sector Composition

Rank Sector Weight
1 Technology 25.8%
2 Financials 13.4%
3 Industrials 12.04%
4 Healthcare 11.22%
5 Communication Services 7.63%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SQQQ icon
1801
ProShares UltraPro Short QQQ
SQQQ
$1.74B
$5.48K ﹤0.01%
80
– –
RSPS icon
1802
Invesco S&P 500 Equal Weight Consumer Staples ETF
RSPS
$247M
$5.08K ﹤0.01%
175
– –
GVI icon
1803
iShares Intermediate Government/Credit Bond ETF
GVI
$3.8B
$4.72K ﹤0.01%
44
-42
-49% -$4.52K
NANR icon
1804
State Street SPDR S&P North American Natural Resources ETF
NANR
$785M
$4.68K ﹤0.01%
69
– –
QLTA icon
1805
iShares AAA-A Rated Corporate Bond ETF
QLTA
$1.22B
$4.67K ﹤0.01%
97
– –
EWQ icon
1806
iShares MSCI France ETF
EWQ
$335M
$4.54K ﹤0.01%
101
– –
BF.A icon
1807
Brown-Forman Class A
BF.A
$13.3B
$4.32K ﹤0.01%
+164
New +$4.58K
XRT icon
1808
State Street SPDR S&P Retail ETF
XRT
$654M
$4.01K ﹤0.01%
47
– –
FXU icon
1809
First Trust Utilities AlphaDEX Fund
FXU
$825M
$3.92K ﹤0.01%
87
-707
-89% -$32.6K
EMC icon
1810
Global X Emerging Markets Great Consumer ETF
EMC
$56.5M
$3.87K ﹤0.01%
126
– –
PRN icon
1811
Invesco Dorsey Wright Industrials Momentum ETF
PRN
$439M
$3.84K ﹤0.01%
22
– –
INTF icon
1812
iShares International Equity Factor ETF
INTF
$3.75B
$3.77K ﹤0.01%
100
– –
PSL icon
1813
Invesco Dorsey Wright Consumer Staples Momentum ETF
PSL
$84.4M
$3.72K ﹤0.01%
37
– –
EWI icon
1814
iShares MSCI Italy ETF
EWI
$1.08B
$3.69K ﹤0.01%
68
– –
EINC icon
1815
VanEck Energy Income ETF
EINC
$77.4M
$3.66K ﹤0.01%
38
– –
HEZU icon
1816
iShares Currency Hedged MSCI Eurozone ETF
HEZU
$586M
$3.46K ﹤0.01%
79
– –
PEZ icon
1817
Invesco Dorsey Wright Consumer Cyclicals Momentum ETF
PEZ
$22.9M
$3.22K ﹤0.01%
31
– –
IAK icon
1818
iShares US Insurance ETF
IAK
$548M
$3K ﹤0.01%
22
-155
-88% -$20.5K
XRLV
1819
DELISTED
Invesco S&P 500 ex-Rate Sensitive Low Volatility ETF
XRLV
$2.97K ﹤0.01%
55
– –
EWP icon
1820
iShares MSCI Spain ETF
EWP
$2.21B
$2.91K ﹤0.01%
54
– –
NORW icon
1821
Global X MSCI Norway ETF
NORW
$86.1M
$2.61K ﹤0.01%
87
– –
EDEN icon
1822
iShares MSCI Denmark ETF
EDEN
$206M
$2.4K ﹤0.01%
21
– –
ISCV icon
1823
iShares Morningstar Small-Cap Value ETF
ISCV
$706M
$2.4K ﹤0.01%
35
– –
IYT icon
1824
iShares US Transportation ETF
IYT
$2.28B
$2.38K ﹤0.01%
32
– –
MILN
1825
Global X Millennial Consumer ETF
MILN
$103M
$2.35K ﹤0.01%
50
– –
71 72
73
74 75

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William Blair & Company's Q4 2025 Portfolio in Review

As of Q4 2025, William Blair & Company held 1,963 positions worth $37.3B, down 0.82% from $37.6B the previous quarter. Its ten largest holdings account for 27% of the portfolio.

William Blair & Company's Q4 2025 filing shows 120 new, 759 increased, 753 reduced and 96 closed positions. Its largest new stake was Wingstop: 90,773 shares worth $21.6M. The largest sale was Fiserv Inc, an estimated $114M.

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

  • William Blair & Company's largest Q4 2025 buy was Wingstop: 90,773 shares worth $21.6M.
  • William Blair & Company added most to BWX Technologies in Q4 2025, an estimated $46.6M increase.
  • William Blair & Company's biggest Q4 2025 reduction was Fiserv Inc, cutting an estimated $114M.
  • William Blair & Company fully exited SAP in Q4 2025, selling an estimated $9.19M.
  • William Blair & Company's ten largest holdings make up 27% of its $37.3B portfolio in Q4 2025.
  • William Blair & Company opened 120 new positions and closed 96 in Q4 2025.
  • William Blair & Company's portfolio value fell 0.82% quarter-over-quarter to $37.3B.

Based on William Blair & Company's 13F filing for Q4 2025, filed 17 Feb 2026.