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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
EES icon
1226
WisdomTree US SmallCap Earnings Fund
EES
$736M
$371K ﹤0.01%
6,646
-5,953
-47% -$322K
ITIC
1227
Investors Title Co
ITIC
$534M
$371K ﹤0.01%
1,384
– –
CNP icon
1228
CenterPoint Energy
CNP
$26.7B
$370K ﹤0.01%
9,542
+211
+2% +$7.97K
PECO icon
1229
Phillips Edison & Co
PECO
$5.2B
$369K ﹤0.01%
10,735
-3,144
-23% -$109K
FBIN icon
1230
Fortune Brands Innovations
FBIN
$5.78B
$368K ﹤0.01%
6,895
-181
-3% -$10.2K
ATO icon
1231
Atmos Energy
ATO
$28.7B
$367K ﹤0.01%
2,146
+176
+9% +$28.4K
CSGS
1232
DELISTED
CSG Systems International
CSGS
$365K ﹤0.01%
5,670
-1,297
-19% -$82.6K
USMC icon
1233
Principal Exchange-Traded Funds Principal US Mega-Cap ETF
USMC
$3.71B
$365K ﹤0.01%
5,351
– –
WES icon
1234
Western Midstream Partners
WES
$20B
$364K ﹤0.01%
9,260
-8,130
-47% -$317K
AEE icon
1235
Ameren
AEE
$30.2B
$362K ﹤0.01%
3,470
-478
-12% -$47.7K
MOG.A icon
1236
Moog Inc Class A
MOG.A
$13.5B
$361K ﹤0.01%
1,740
+214
+14% +$41.3K
INSP icon
1237
Inspire Medical Systems
INSP
$1.68B
$361K ﹤0.01%
4,865
+234
+5% +$23.7K
TKR icon
1238
Timken Company
TKR
$9.1B
$361K ﹤0.01%
4,801
+610
+15% +$47K
DAY
1239
DELISTED
Dayforce
DAY
$361K ﹤0.01%
5,235
-502
-9% -$31.2K
RGA icon
1240
Reinsurance Group of America
RGA
$16.4B
$359K ﹤0.01%
1,868
+168
+10% +$32.2K
GATX icon
1241
GATX Corp
GATX
$6.33B
$357K ﹤0.01%
2,042
+278
+16% +$45K
MSCI icon
1242
MSCI
MSCI
$41.8B
$357K ﹤0.01%
629
-563
-47% -$318K
OLED icon
1243
Universal Display
OLED
$4.18B
$356K ﹤0.01%
2,482
-23
-0.9% -$3.34K
LYFT icon
1244
Lyft
LYFT
$6.48B
$356K ﹤0.01%
16,159
+219
+1% +$3.67K
HXL icon
1245
Hexcel
HXL
$7.74B
$355K ﹤0.01%
5,659
+1,783
+46% +$109K
BBCP icon
1246
Concrete Pumping Holdings
BBCP
$475M
$353K ﹤0.01%
50,000
– –
GEF icon
1247
Greif
GEF
$5.03B
$352K ﹤0.01%
5,898
+4
+0.1% +$258
EQNR icon
1248
Equinor
EQNR
$96.3B
$352K ﹤0.01%
14,448
+5,816
+67% +$146K
FUTY icon
1249
Fidelity MSCI Utilities Index ETF
FUTY
$2.31B
$352K ﹤0.01%
6,233
+11
+0.2% +$601
SLYV icon
1250
State Street SPDR S&P 600 Small Cap Value ETF
SLYV
$5.12B
$352K ﹤0.01%
3,969
-517
-12% -$44K
48 49
50
51 52

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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.