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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
GNL icon
1526
Global Net Lease
GNL
$1.9B
$134K ﹤0.01%
16,423
+4,123
+34% +$31.5K
PXF icon
1527
Invesco FTSE RAFI Developed Markets ex-US ETF
PXF
$2.97B
$133K ﹤0.01%
2,176
+1,146
+111% +$68.1K
GSIE icon
1528
Goldman Sachs ActiveBeta International Equity ETF
GSIE
$6.14B
$130K ﹤0.01%
3,168
+965
+44% +$39K
SVCO
1529
Silvaco Group
SVCO
$251M
$130K ﹤0.01%
24,000
+7,000
+41% +$34.2K
VIOG icon
1530
Vanguard S&P Small-Cap 600 Growth ETF
VIOG
$1.13B
$130K ﹤0.01%
1,065
– –
BLV icon
1531
Vanguard Long-Term Bond ETF
BLV
$5.7B
$129K ﹤0.01%
1,826
+714
+64% +$49.6K
DGS icon
1532
WisdomTree Emerging Markets SmallCap Dividend Fund
DGS
$1.78B
$128K ﹤0.01%
2,243
+1
+0% +$57
FLRN icon
1533
State Street SPDR Bloomberg Investment Grade Floating Rate ETF
FLRN
$2.97B
$127K ﹤0.01%
4,126
+83
+2% +$2.56K
PSEC icon
1534
Prospect Capital
PSEC
$1.15B
$126K ﹤0.01%
45,700
-7,773
-15% -$23.2K
REAX icon
1535
Real Brokerage
REAX
$508M
$125K ﹤0.01%
30,000
– –
NXE icon
1536
NexGen Energy
NXE
$7.07B
$125K ﹤0.01%
13,921
– –
QS icon
1537
QuantumScape Corp
QS
$3.92B
$124K ﹤0.01%
+10,059
New +$98.1K
RWL icon
1538
Invesco S&P 500 Revenue ETF
RWL
$9.95B
$124K ﹤0.01%
1,117
-1
-0.1% -$107
BLZE icon
1539
Backblaze
BLZE
$1.2B
$122K ﹤0.01%
13,194
-35,000
-73% -$257K
OPPE
1540
WisdomTree European Opportunities Fund
OPPE
$295M
$122K ﹤0.01%
2,500
– –
HEDJ icon
1541
WisdomTree Europe Hedged Equity Fund
HEDJ
$1.87B
$122K ﹤0.01%
2,418
-1,000
-29% -$49.4K
PCY icon
1542
Invesco Emerging Markets Sovereign Debt ETF
PCY
$1.39B
$121K ﹤0.01%
5,614
+422
+8% +$8.81K
ITB icon
1543
iShares US Home Construction ETF
ITB
$2.34B
$120K ﹤0.01%
1,116
+50
+5% +$5.27K
FTA icon
1544
First Trust Large Cap Value AlphaDEX Fund
FTA
$1.42B
$118K ﹤0.01%
1,415
-2,712
-66% -$221K
EWW icon
1545
iShares MSCI Mexico ETF
EWW
$1.9B
$114K ﹤0.01%
1,673
– –
EEMV icon
1546
iShares MSCI Emerging Markets Min Vol Factor ETF
EEMV
$3.6B
$113K ﹤0.01%
1,766
+234
+15% +$14.8K
SLQT icon
1547
SelectQuote
SLQT
$124M
$112K ﹤0.01%
57,115
+2,115
+4% +$4.47K
SCHH icon
1548
Schwab US REIT ETF
SCHH
$11.3B
$112K ﹤0.01%
5,179
-157
-3% -$3.35K
TAN icon
1549
Invesco Solar ETF
TAN
$1.37B
$109K ﹤0.01%
2,500
-230
-8% -$9.19K
AEF
1550
abrdn Emerging Markets Equity Income Fund
AEF
$380M
$107K ﹤0.01%
16,533
-10
-0.1% -$62
60 61
62
63 64

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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.