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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
GLDG
1701
GoldMining Inc
GLDG
$223M
$24.6K ﹤0.01%
20,000
– –
ITM icon
1702
VanEck Intermediate Muni ETF
ITM
$2.13B
$24.6K ﹤0.01%
527
+327
+164% +$15K
IBTI icon
1703
iShares iBonds Dec 2028 Term Treasury ETF
IBTI
$1.93B
$24.2K ﹤0.01%
1,082
-1,204
-53% -$26.9K
IAK icon
1704
iShares US Insurance ETF
IAK
$534M
$23.7K ﹤0.01%
177
– –
DTH icon
1705
WisdomTree International High Dividend Fund
DTH
$659M
$23K ﹤0.01%
468
– –
STXF
1706
Strive 500 ETF
STXF
$1.16B
$22.7K ﹤0.01%
+525
New +$21.8K
KBE icon
1707
State Street SPDR S&P Bank ETF
KBE
$1.74B
$22.5K ﹤0.01%
378
-175
-32% -$10.3K
TDOC icon
1708
Teladoc Health
TDOC
$1.22B
$21.6K ﹤0.01%
2,799
-75
-3% -$585
MXCT icon
1709
MaxCyte
MXCT
$136M
$21.3K ﹤0.01%
13,502
-234,500
-95% -$408K
IFGL icon
1710
iShares International Developed Real Estate ETF
IFGL
$82.2M
$21.3K ﹤0.01%
923
– –
HTZWW
1711
Hertz Global Holdings Warrants
HTZWW
$112M
$20.8K ﹤0.01%
5,602
– –
OXY.WS icon
1712
Occidental Petroleum Corp Warrants
OXY.WS
$34.4B
$20.8K ﹤0.01%
816
– –
RWX icon
1713
State Street SPDR Dow Jones International Real Estate ETF
RWX
$267M
$20.3K ﹤0.01%
729
-56
-7% -$1.54K
KBWB icon
1714
Invesco KBW Bank ETF
KBWB
$6.85B
$20.2K ﹤0.01%
258
-175
-40% -$13.2K
XSW icon
1715
State Street SPDR S&P Software & Services ETF
XSW
$493M
$19.8K ﹤0.01%
100
– –
BRF icon
1716
VanEck Brazil Small-Cap ETF
BRF
$20.4M
$19.6K ﹤0.01%
1,203
– –
IGLB icon
1717
iShares 10+ Year Investment Grade Corporate Bond ETF
IGLB
$2.78B
$18.9K ﹤0.01%
366
+237
+184% +$11.9K
DLPN icon
1718
Dolphin Entertainment
DLPN
$14.8M
$18.6K ﹤0.01%
14,552
– –
FAD icon
1719
First Trust Multi Cap Growth AlphaDEX Fund
FAD
$599M
$18.5K ﹤0.01%
115
+23
+25% +$3.52K
UAA icon
1720
Under Armour
UAA
$2.26B
$18.4K ﹤0.01%
3,688
+14
+0.4% +$82
FXH icon
1721
First Trust Health Care AlphaDEX Fund
FXH
$1.11B
$18.1K ﹤0.01%
165
– –
VGLT icon
1722
Vanguard Long-Term Treasury ETF
VGLT
$10.3B
$18.1K ﹤0.01%
318
– –
FDIS icon
1723
Fidelity MSCI Consumer Discretionary Index ETF
FDIS
$1.71B
$17.6K ﹤0.01%
171
-475
-74% -$46.9K
TEQI icon
1724
T. Rowe Price Equity Income ETF
TEQI
$469M
$17.5K ﹤0.01%
400
– –
FWONA icon
1725
Liberty Media Series A
FWONA
$23.7B
$17.1K ﹤0.01%
180
-4
-2% -$365
67 68
69
70 71

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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.