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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
JHML icon
1651
John Hancock Multifactor Large Cap ETF
JHML
$1.2B
$51.9K ﹤0.01%
650
– –
EQAL icon
1652
Invesco Russell 1000 Equal Weight ETF
EQAL
$837M
$51.7K ﹤0.01%
982
– –
PFFD icon
1653
Global X US Preferred ETF
PFFD
$2.16B
$51.6K ﹤0.01%
2,731
+1
+0% +$19
RSPM icon
1654
Invesco S&P 500 Equal Weight Materials ETF
RSPM
$185M
$51.5K ﹤0.01%
1,510
– –
LIT icon
1655
Global X Lithium & Battery Tech ETF
LIT
$1.6B
$51K ﹤0.01%
787
– –
DVYE icon
1656
iShares Emerging Markets Dividend ETF
DVYE
$1.22B
$50.6K ﹤0.01%
1,625
– –
CDXS icon
1657
Codexis
CDXS
$165M
$49.5K ﹤0.01%
30,390
-4,903
-14% -$10K
IAI icon
1658
iShares US Broker-Dealers & Securities Exchanges ETF
IAI
$1.37B
$49.1K ﹤0.01%
274
-10
-4% -$1.76K
PZA icon
1659
Invesco National AMT-Free Municipal Bond ETF
PZA
$4.26B
$47.7K ﹤0.01%
2,058
+572
+38% +$13.3K
XPH icon
1660
State Street SPDR S&P Pharmaceuticals ETF
XPH
$510M
$47.7K ﹤0.01%
851
– –
ALIT icon
1661
Alight
ALIT
$399M
$47.6K ﹤0.01%
+1,220
New +$60.8K
GBF icon
1662
iShares Government/Credit Bond ETF
GBF
$128M
$46.1K ﹤0.01%
440
-128
-23% -$13.5K
RFG icon
1663
Invesco S&P MidCap 400 Pure Growth ETF
RFG
$359M
$45K ﹤0.01%
859
+594
+224% +$30.8K
CLYM
1664
Climb Bio
CLYM
$778M
$44K ﹤0.01%
+11,000
New +$26.4K
SMOG icon
1665
VanEck Low Carbon Energy ETF
SMOG
$134M
$44K ﹤0.01%
339
+5
+1% +$661
HLLY.WS
1666
DELISTED
Holley Inc Warrants
HLLY.WS
$43.8K ﹤0.01%
407,489
+6,000
+1% +$928
FTSM icon
1667
First Trust Enhanced Short Maturity ETF
FTSM
$6.54B
$43.6K ﹤0.01%
728
+482
+196% +$28.9K
NUMG icon
1668
Nuveen ESG Mid-Cap Growth ETF
NUMG
$368M
$43.6K ﹤0.01%
913
– –
OVID icon
1669
Ovid Therapeutics
OVID
$482M
$42.9K ﹤0.01%
26,339
+1,250
+5% +$1.93K
BBH icon
1670
VanEck Biotech ETF
BBH
$426M
$42.6K ﹤0.01%
225
– –
PIE icon
1671
Invesco Dorsey Wright Emerging Markets Momentum ETF
PIE
$244M
$42.5K ﹤0.01%
1,800
– –
EWG icon
1672
iShares MSCI Germany ETF
EWG
$1.67B
$41.3K ﹤0.01%
972
-54
-5% -$2.23K
SDS icon
1673
ProShares UltraShort S&P500
SDS
$368M
$41.1K ﹤0.01%
600
+100
+20% +$7.06K
CSD icon
1674
Invesco S&P Spin-Off ETF
CSD
$227M
$40.9K ﹤0.01%
410
– –
SMMU icon
1675
PIMCO Short Term Municipal Bond Active Exchange-Traded Fund
SMMU
$1.17B
$40.8K ﹤0.01%
810
– –
65 66
67
68 69

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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.