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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
+1.73%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+606.62%
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 Miscellaneous 14.66%
3 Financials 13.4%
4 Industrials 12.04%
5 Healthcare 11.22%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ONCY
1701
Oncolytics Biotech
ONCY
$87.1M
$27.5K ﹤0.01%
+31,467
New +$34K
PAWZ icon
1702
ProShares Pet Care ETF
PAWZ
$30.6M
$27.3K ﹤0.01%
500
– –
OUSA icon
1703
ALPS O'Shares U.S. Quality Dividend ETF
OUSA
$724M
$27.3K ﹤0.01%
473
+2
+0.4% +$113
DJD icon
1704
Invesco Dow Jones Industrial Average Dividend ETF
DJD
$498M
$27.3K ﹤0.01%
477
+3
+0.6% +$169
PSQ icon
1705
ProShares Short QQQ
PSQ
$774M
$27K ﹤0.01%
896
+3
+0.3% +$91
CHRS icon
1706
Coherus Oncology
CHRS
$175M
$27K ﹤0.01%
+19,000
New +$27.7K
VXX icon
1707
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$125M
$26.9K ﹤0.01%
1,018
+200
+24% +$6.54K
IGLB icon
1708
iShares 10+ Year Investment Grade Corporate Bond ETF
IGLB
$2.86B
$26.6K ﹤0.01%
527
+161
+44% +$8.25K
HYS icon
1709
PIMCO 0-5 Year High Yield Corporate Bond Index Exchange-Traded Fund
HYS
$1.77B
$26.4K ﹤0.01%
278
-50
-15% -$4.75K
TLTE icon
1710
Northern Trust Morningstar Emerging Markets Factor Tilt ETF
TLTE
$354M
$26.2K ﹤0.01%
+411
New +$26.3K
VFQY icon
1711
Vanguard US Quality Factor ETF
VFQY
$494M
$26.1K ﹤0.01%
+170
New +$25.8K
UAA icon
1712
Under Armour
UAA
$1.9B
$25.7K ﹤0.01%
5,164
+1,476
+40% +$6.83K
STXG icon
1713
Strive 1000 Growth ETF
STXG
$154M
$25.4K ﹤0.01%
500
– –
TMCI icon
1714
Treace Medical Concepts
TMCI
$293M
$24.7K ﹤0.01%
10,080
– –
MODD icon
1715
Modular Medical
MODD
$17.2M
$24.6K ﹤0.01%
2,253
– –
DTH icon
1716
WisdomTree International High Dividend Fund
DTH
$648M
$24.2K ﹤0.01%
468
– –
IWL icon
1717
iShares Russell Top 200 ETF
IWL
$2.24B
$23.9K ﹤0.01%
+140
New +$23.7K
STXF
1718
Strive 500 ETF
STXF
$1.18B
$23.1K ﹤0.01%
525
– –
SOCL icon
1719
Global X Social Media ETF
SOCL
$90.1M
$22.9K ﹤0.01%
415
– –
DLPN icon
1720
Dolphin Entertainment
DLPN
$14.1M
$22.7K ﹤0.01%
14,552
– –
GSST icon
1721
Goldman Sachs Access Ultra Short Bond ETF
GSST
$1.65B
$22.1K ﹤0.01%
437
+117
+37% +$5.92K
KBWB icon
1722
Invesco KBW Bank ETF
KBWB
$6.54B
$21.7K ﹤0.01%
257
-1
-0.4% -$79
IFGL icon
1723
iShares International Developed Real Estate ETF
IFGL
$75.7M
$21.3K ﹤0.01%
923
– –
MXCT icon
1724
MaxCyte
MXCT
$121M
$20.9K ﹤0.01%
13,500
-2
-0% -$3
FWONA icon
1725
Liberty Media Corporation Series A Common Stock
FWONA
$21.7B
$20.7K ﹤0.01%
232
+52
+29% +$4.67K
67 68
69
70 71

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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 Miscellaneous and Financials.

  • 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.