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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
+7.16%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$37.6B
AUM Growth
+$1.57B
Cap. Flow
-$160M
Cap. Flow %
-0.43%
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75

Top Buys

Rank Stock Value
1
META icon
Meta Platforms (Facebook)
META
+$76.1M
2
APP icon
Applovin
APP
+$75.3M
3
NOW icon
ServiceNow
NOW
+$66.6M
4
CWAN
Clearwater Analytics
CWAN
+$65.8M
5
FANG icon
Diamondback Energy
FANG
+$30.7M

Top Sells

Rank Stock Value
1
CYBR
CyberArk
CYBR
+$70.7M
2
ADBE icon
Adobe
ADBE
+$61.7M
3
MSFT icon
Microsoft
MSFT
+$45.7M
4
WDAY icon
Workday
WDAY
+$42.6M
5
POOL icon
Pool Corp
POOL
+$41.7M

Sector Composition

Rank Sector Weight
1 Technology 27.36%
2 Financials 13.36%
3 Industrials 12.59%
4 Healthcare 10.97%
5 Consumer Discretionary 7.45%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
FSMD icon
1726
Fidelity Small-Mid Multifactor ETF
FSMD
$2.61B
$17.1K ﹤0.01%
389
+134
+53% +$5.76K
STXV icon
1727
Strive 1000 Value ETF
STXV
$83.5M
$16.6K ﹤0.01%
+513
New +$16.2K
GSSC icon
1728
GS ActiveBeta US Small Cap Equity ETF
GSSC
$1.1B
$16.3K ﹤0.01%
218
– –
GSST icon
1729
Goldman Sachs Access Ultra Short Bond ETF
GSST
$1.59B
$16.2K ﹤0.01%
320
+2
+0.6% +$101
EPOL icon
1730
iShares MSCI Poland ETF
EPOL
$825M
$16.1K ﹤0.01%
500
– –
LLYVA icon
1731
Liberty Live Group Series A
LLYVA
$9.45B
$15.9K ﹤0.01%
169
– –
ENFR icon
1732
Alerian Energy Infrastructure ETF
ENFR
$521M
$15.4K ﹤0.01%
475
– –
FTXO icon
1733
First Trust Nasdaq Bank ETF
FTXO
$321M
$15.4K ﹤0.01%
+432
New +$15K
CLIP icon
1734
Global X 1-3 Month T-Bill ETF
CLIP
$2.4B
$15.4K ﹤0.01%
153
– –
CZA icon
1735
Invesco Zacks Mid-Cap ETF
CZA
$192M
$14.8K ﹤0.01%
135
– –
FTSM icon
1736
First Trust Enhanced Short Maturity ETF
FTSM
$6.54B
$14.7K ﹤0.01%
246
-59
-19% -$3.54K
FDIQ
1737
Invesco Bloomberg Financial Data Providers ETF
FDIQ
$48.1M
$14.6K ﹤0.01%
241
– –
FVAL icon
1738
Fidelity Value Factor ETF
FVAL
$1.37B
$14.6K ﹤0.01%
212
+12
+6% +$796
EWS icon
1739
iShares MSCI Singapore ETF
EWS
$1.16B
$14.3K ﹤0.01%
504
-197
-28% -$5.44K
SMMV icon
1740
iShares MSCI USA Small-Cap Min Vol Factor ETF
SMMV
$291M
$13.6K ﹤0.01%
317
– –
RFG icon
1741
Invesco S&P MidCap 400 Pure Growth ETF
RFG
$362M
$13.5K ﹤0.01%
265
– –
FSIG icon
1742
First Trust Limited Duration Investment Grade Corporate ETF
FSIG
$1.52B
$13.3K ﹤0.01%
694
– –
DIV icon
1743
Global X SuperDividend US ETF
DIV
$776M
$13.3K ﹤0.01%
750
-255
-25% -$4.52K
FIW icon
1744
First Trust Water ETF
FIW
$1.92B
$13.1K ﹤0.01%
116
– –
FXN icon
1745
First Trust Energy AlphaDEX Fund
FXN
$388M
$12.8K ﹤0.01%
786
– –
REZ icon
1746
iShares Residential and Multisector Real Estate ETF
REZ
$848M
$12.8K ﹤0.01%
151
-29
-16% -$2.41K
FCVT icon
1747
First Trust SSI Strategic Convertible Securities ETF
FCVT
$103M
$12.6K ﹤0.01%
295
– –
VNM icon
1748
VanEck Vietnam ETF
VNM
$514M
$12.5K ﹤0.01%
700
– –
FTSL icon
1749
First Trust Senior Loan Fund ETF
FTSL
$2.33B
$11.9K ﹤0.01%
259
+4
+2% +$184
ALB.PRA icon
1750
Albemarle Corp Depositary Shares
ALB.PRA
$2.46B
$11.4K ﹤0.01%
300
– –
68 69
70
71 72

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William Blair & Company's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.

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

  • William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
  • William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
  • William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
  • William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
  • William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
  • William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
  • William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.

Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.