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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
NTLA icon
1501
Intellia Therapeutics
NTLA
$1.68B
$163K ﹤0.01%
18,160
-2,000
-10% -$27.5K
FHLC icon
1502
Fidelity MSCI Health Care Index ETF
FHLC
$3.41B
$161K ﹤0.01%
2,169
+149
+7% +$10.7K
HLLY icon
1503
Holley
HLLY
$382M
$159K ﹤0.01%
38,550
+23,500
+156% +$84.6K
PXF icon
1504
Invesco FTSE RAFI Developed Markets ex-US ETF
PXF
$2.95B
$159K ﹤0.01%
2,428
+252
+12% +$15.9K
SHYG icon
1505
iShares 0-5 Year High Yield Corporate Bond ETF
SHYG
$7.59B
$158K ﹤0.01%
3,682
+91
+3% +$3.9K
GALT icon
1506
Galectin Therapeutics
GALT
$324M
$158K ﹤0.01%
37,884
– –
TAK icon
1507
Takeda Pharmaceutical
TAK
$55.9B
$156K ﹤0.01%
+10,011
New +$143K
SOUN icon
1508
SoundHound AI
SOUN
$3.25B
$154K ﹤0.01%
15,496
-18,177
-54% -$262K
IYY icon
1509
iShares Dow Jones US ETF
IYY
$3.07B
$151K ﹤0.01%
910
– –
SPYD icon
1510
State Street SPDR Portfolio S&P 500 High Dividend ETF
SPYD
$7.67B
$150K ﹤0.01%
3,464
+1,176
+51% +$50.9K
RPAY icon
1511
Repay Holdings
RPAY
$315M
$150K ﹤0.01%
41,044
+6,409
+19% +$25.7K
ETHO icon
1512
Amplify Etho Climate Leadership US ETF
ETHO
$194M
$147K ﹤0.01%
2,250
+23
+1% +$1.49K
NUS icon
1513
Nu Skin
NUS
$254M
$146K ﹤0.01%
15,154
+13
+0.1% +$135
CLF icon
1514
Cleveland-Cliffs
CLF
$7.19B
$143K ﹤0.01%
+10,789
New +$136K
DWM icon
1515
WisdomTree International Equity Fund
DWM
$692M
$143K ﹤0.01%
2,081
+11
+0.5% +$739
ARDX icon
1516
Ardelyx
ARDX
$972M
$143K ﹤0.01%
24,507
+7
+0% +$39
JNK icon
1517
State Street SPDR Bloomberg High Yield Bond ETF
JNK
$7.29B
$142K ﹤0.01%
1,457
+987
+210% +$95.9K
GNL icon
1518
Global Net Lease
GNL
$1.97B
$141K ﹤0.01%
16,400
-23
-0.1% -$184
NUSC icon
1519
Nuveen ESG Small-Cap ETF
NUSC
$1.33B
$141K ﹤0.01%
3,153
– –
BBUS icon
1520
JPMorgan BetaBuilders US Equity ETF
BBUS
$9.22B
$141K ﹤0.01%
1,140
+673
+144% +$82.4K
UPRO icon
1521
ProShares UltraPro S&P 500
UPRO
$5.76B
$139K ﹤0.01%
1,200
-322
-21% -$36.8K
SGOV icon
1522
iShares 0-3 Month Treasury Bond ETF
SGOV
$101B
$139K ﹤0.01%
1,380
+1,299
+1,604% +$131K
PNQI icon
1523
Invesco NASDAQ Internet ETF
PNQI
$545M
$137K ﹤0.01%
2,545
-10,000
-80% -$546K
GSIE icon
1524
Goldman Sachs ActiveBeta International Equity ETF
GSIE
$6.14B
$136K ﹤0.01%
3,168
– –
SPRY icon
1525
ARS Pharmaceuticals
SPRY
$581M
$135K ﹤0.01%
+11,600
New +$113K
59 60
61
62 63

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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.