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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
ARCC icon
576
Ares Capital
ARCC
$14.4B
$3.99M 0.01%
195,407
-1,978
-1% -$44K
CWB icon
577
State Street SPDR Bloomberg Convertible Securities ETF
CWB
$5.74B
$3.98M 0.01%
43,977
+19,701
+81% +$1.69M
IRDM icon
578
Iridium Communications
IRDM
$5.31B
$3.98M 0.01%
227,731
+28,120
+14% +$695K
SCHA icon
579
Schwab U.S Small- Cap ETF
SCHA
$23.4B
$3.92M 0.01%
140,526
-5,623
-4% -$150K
HOLX
580
DELISTED
Hologic
HOLX
$3.9M 0.01%
57,805
+2,245
+4% +$149K
DDOG icon
581
Datadog
DDOG
$89.2B
$3.89M 0.01%
27,307
-1,899
-7% -$261K
AYI icon
582
Acuity Brands
AYI
$10.7B
$3.89M 0.01%
11,288
+248
+2% +$79.1K
IWY icon
583
iShares Russell Top 200 Growth ETF
IWY
$16.7B
$3.89M 0.01%
14,198
-2,023
-12% -$523K
VONV icon
584
Vanguard Russell 1000 Value ETF
VONV
$22B
$3.86M 0.01%
43,215
+22,115
+105% +$1.93M
VTEB icon
585
Vanguard Tax-Exempt Bond Index Fund
VTEB
$46.1B
$3.86M 0.01%
77,130
-12,420
-14% -$610K
HTGC icon
586
Hercules Capital
HTGC
$3.14B
$3.84M 0.01%
203,205
– –
STVN icon
587
Stevanato
STVN
$5.82B
$3.84M 0.01%
149,225
-5,923
-4% -$146K
WSC icon
588
WillScot Mobile Mini Holdings
WSC
$4.04B
$3.83M 0.01%
181,347
-891
-0.5% -$23K
HCA icon
589
HCA Healthcare
HCA
$88B
$3.79M 0.01%
8,890
-110
-1% -$42.6K
DIVO icon
590
Amplify CWP Enhanced Dividend Income ETF
DIVO
$7.82B
$3.76M 0.01%
84,295
+13,790
+20% +$598K
SPEM icon
591
State Street SPDR Portfolio Emerging Markets ETF
SPEM
$17.7B
$3.75M 0.01%
80,039
+8,829
+12% +$393K
SPYG icon
592
State Street SPDR Portfolio S&P 500 Growth ETF
SPYG
$55.5B
$3.74M 0.01%
35,810
-1,685
-4% -$168K
RH icon
593
RH
RH
$3.44B
$3.72M 0.01%
18,332
-1,884
-9% -$409K
EVH icon
594
Evolent Health
EVH
$488M
$3.71M 0.01%
438,931
-5,343
-1% -$51.8K
BBY icon
595
Best Buy
BBY
$18B
$3.68M 0.01%
48,712
+1,657
+4% +$119K
WAL icon
596
Western Alliance Bancorporation
WAL
$8.95B
$3.68M 0.01%
42,426
– –
CHKP icon
597
Check Point Software Technologies
CHKP
$13.3B
$3.68M 0.01%
17,777
-3,982
-18% -$802K
KAUG
598
Innovator U.S. Small Cap Power Buffer ETF - August
KAUG
$63.9M
$3.68M 0.01%
141,383
+28,553
+25% +$723K
SUB icon
599
iShares Short-Term National Muni Bond ETF
SUB
$11.4B
$3.66M 0.01%
34,259
-276
-0.8% -$29.5K
DKS icon
600
Dick's Sporting Goods
DKS
$18B
$3.66M 0.01%
16,454
-499
-3% -$109K
22 23
24
25 26

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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.