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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
EAGG icon
1576
iShares ESG Aware US Aggregate Bond ETF
EAGG
$4.97B
$90.7K ﹤0.01%
1,896
-93
-5% -$4.47K
IZRL icon
1577
ARK Israel Innovative Technology ETF
IZRL
$140M
$89.4K ﹤0.01%
2,990
– –
PXH icon
1578
Invesco FTSE RAFI Emerging Markets ETF
PXH
$1.98B
$89.4K ﹤0.01%
3,462
+260
+8% +$6.7K
EWZ icon
1579
iShares MSCI Brazil ETF
EWZ
$8.89B
$87.4K ﹤0.01%
2,752
+8
+0.3% +$253
FPX icon
1580
First Trust US Equity Opportunities ETF
FPX
$1.48B
$87.2K ﹤0.01%
533
+93
+21% +$15.3K
RMCO icon
1581
Royalty Management
RMCO
$47M
$86.3K ﹤0.01%
+27,932
New +$79.5K
SMIN icon
1582
iShares MSCI India Small-Cap ETF
SMIN
$769M
$86.3K ﹤0.01%
1,234
-765
-38% -$55.2K
QCLN icon
1583
First Trust NASDAQ Clean Edge Green Energy Index Fund
QCLN
$623M
$86.1K ﹤0.01%
1,931
-45
-2% -$2.03K
USHY icon
1584
iShares Broad USD High Yield Corporate Bond ETF
USHY
$29.1B
$85.8K ﹤0.01%
2,295
+74
+3% +$2.77K
GSY icon
1585
Invesco Ultra Short Duration ETF
GSY
$3.88B
$85.8K ﹤0.01%
1,708
+2
+0.1% +$101
TALK icon
1586
Talkspace
TALK
$878M
$85.7K ﹤0.01%
23,620
+1,700
+8% +$5.39K
RWR icon
1587
State Street SPDR Dow Jones REIT ETF
RWR
$1.86B
$85.7K ﹤0.01%
873
+1
+0.1% +$100
DSX icon
1588
Diana Shipping
DSX
$299M
$84.9K ﹤0.01%
51,157
+294
+0.6% +$512
RSPG icon
1589
Invesco S&P 500 Equal Weight Energy ETF
RSPG
$585M
$83.8K ﹤0.01%
1,053
+1
+0.1% +$80
ACHR icon
1590
Archer Aviation
ACHR
$4.57B
$83.8K ﹤0.01%
11,145
-30,029
-73% -$283K
DEM icon
1591
WisdomTree Emerging Markets High Dividend Fund
DEM
$3.97B
$83K ﹤0.01%
1,777
– –
GMF icon
1592
State Street SPDR S&P Emerging Asia Pacific ETF
GMF
$439M
$82.8K ﹤0.01%
597
-658
-52% -$91.9K
SLI
1593
Standard Lithium
SLI
$623M
$82.7K ﹤0.01%
18,500
– –
IMTB icon
1594
iShares Core 5-10 Year USD Bond ETF
IMTB
$275M
$82.7K ﹤0.01%
1,870
– –
BOND icon
1595
PIMCO Active Bond Exchange-Traded Fund
BOND
$8.46B
$82.4K ﹤0.01%
885
-21
-2% -$1.97K
IGE icon
1596
iShares North American Natural Resources ETF
IGE
$775M
$82.3K ﹤0.01%
1,639
+327
+25% +$16K
PBE icon
1597
Invesco Biotechnology & Genome ETF
PBE
$357M
$82.2K ﹤0.01%
1,000
– –
CQQQ icon
1598
Invesco China Technology ETF
CQQQ
$3.3B
$81.4K ﹤0.01%
1,565
+13
+0.8% +$707
IYM icon
1599
iShares US Basic Materials ETF
IYM
$1.03B
$81.3K ﹤0.01%
528
– –
COMT icon
1600
iShares GSCI Commodity Dynamic Roll Strategy ETF
COMT
$1.22B
$81.1K ﹤0.01%
+3,259
New +$86.2K
62 63
64
65 66

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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.