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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
+12.61%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
AUM
$36B
AUM Growth
+$2.85B
Cap. Flow
-$222M
Cap. Flow %
-0.62%
Top 10 Hldgs %
24.91%
Holding
1,911
New
111
Increased
662
Reduced
757
Closed
87

Top Buys

Rank Stock Value
1
GEV icon
GE Vernova
GEV
+$116M
2
BA icon
Boeing
BA
+$34M
3
CWAN
Clearwater Analytics
CWAN
+$31.2M
4
NVDA icon
NVIDIA
NVDA
+$27.5M
5
NET icon
Cloudflare
NET
+$26.2M

Top Sells

Rank Stock Value
1
XYZ
Block Inc
XYZ
+$79.4M
2
ZTS icon
Zoetis
ZTS
+$41.3M
3
ACN icon
Accenture
ACN
+$40.8M
4
IJH icon
iShares Core S&P Mid-Cap ETF
IJH
+$40.7M
5
UNH icon
UnitedHealth
UNH
+$36.4M

Sector Composition

Rank Sector Weight
1 Technology 27.47%
2 Financials 13.92%
3 Industrials 12.94%
4 Healthcare 11.51%
5 Consumer Discretionary 7.98%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
IRTC icon
76
iRhythm Holdings
IRTC
$4.11B
$114M 0.32%
739,331
-50,668
-6% -$6.55M
ORCL icon
77
Oracle
ORCL
$414B
$114M 0.32%
519,237
+19,470
+4% +$3.14M
LIN icon
78
Linde
LIN
$226B
$113M 0.31%
239,971
-2,036
-0.8% -$929K
KO icon
79
Coca-Cola
KO
$373B
$110M 0.3%
1,549,871
+2,068
+0.1% +$147K
SPGI icon
80
S&P Global
SPGI
$120B
$109M 0.3%
205,995
+119
+0.1% +$59.4K
IWM icon
81
iShares Russell 2000 ETF
IWM
$82.3B
$107M 0.3%
493,580
-24,873
-5% -$5.01M
LYV icon
82
Live Nation Entertainment
LYV
$42.4B
$106M 0.3%
702,111
-24,833
-3% -$3.42M
GS icon
83
Goldman Sachs
GS
$303B
$106M 0.29%
150,016
-8,356
-5% -$4.84M
IWF icon
84
iShares Russell 1000 Growth ETF
IWF
$127B
$106M 0.29%
996,372
+113,880
+13% +$10.9M
XOM icon
85
ExxonMobil
XOM
$637B
$105M 0.29%
971,001
+11,127
+1% +$1.19M
ITW icon
86
Illinois Tool Works
ITW
$85B
$104M 0.29%
421,557
-23,295
-5% -$5.63M
SBUX icon
87
Starbucks
SBUX
$120B
$100M 0.28%
1,093,892
-126,023
-10% -$10.9M
MCD icon
88
McDonald's
MCD
$196B
$100M 0.28%
342,182
+1,135
+0.3% +$350K
IUSV icon
89
iShares Core S&P US Value ETF
IUSV
$27.5B
$99.3M 0.28%
1,049,440
-88,757
-8% -$8.01M
ORLY icon
90
O'Reilly Automotive
ORLY
$76.3B
$97.3M 0.27%
1,079,612
-16,183
-1% -$1.48M
CVX icon
91
Chevron
CVX
$370B
$93.5M 0.26%
652,914
-3,514
-0.5% -$495K
WM icon
92
Waste Management
WM
$91.1B
$92.4M 0.26%
403,716
+99,943
+33% +$23.2M
ROK icon
93
Rockwell Automation
ROK
$49.6B
$92M 0.26%
276,929
-12,437
-4% -$3.54M
TSLA icon
94
Tesla
TSLA
$1.26T
$90.1M 0.25%
283,552
+27,874
+11% +$8.4M
CRWD icon
95
CrowdStrike
CRWD
$209B
$89M 0.25%
699,212
+61,036
+10% +$6.62M
CWAN
96
DELISTED
Clearwater Analytics
CWAN
$85.3M 0.24%
3,888,661
+1,354,391
+53% +$31.2M
VUG icon
97
Vanguard Morningstar Growth ETF
VUG
$229B
$83M 0.23%
1,135,800
-13,410
-1% -$883K
RBA icon
98
RB Global
RBA
$17.3B
$82.6M 0.23%
778,279
-29,154
-4% -$2.99M
VTI icon
99
Vanguard Morningstar Total Stock Market ETF
VTI
$680B
$82.2M 0.23%
270,338
+5,931
+2% +$1.67M
GD icon
100
General Dynamics
GD
$105B
$81.5M 0.23%
279,576
-10,991
-4% -$3.03M
2 3
4
5 6

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William Blair & Company's Q2 2025 Portfolio in Review

As of Q2 2025, William Blair & Company held 1,911 positions worth $36B, up 8.6% from $33.2B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company's Q2 2025 filing shows 111 new, 662 increased, 757 reduced and 87 closed positions. Its largest new stake was Affirm: 304,959 shares worth $21.1M. The largest sale was Block Inc, an estimated $79.4M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, up from 26% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q2 2025 buy was Affirm: 304,959 shares worth $21.1M.
  • William Blair & Company added most to GE Vernova in Q2 2025, an estimated $116M increase.
  • William Blair & Company's biggest Q2 2025 reduction was Block Inc, cutting an estimated $79.4M.
  • William Blair & Company fully exited Discover Financial Services in Q2 2025, selling an estimated $5.21M.
  • William Blair & Company's ten largest holdings make up 25% of its $36B portfolio in Q2 2025.
  • William Blair & Company opened 111 new positions and closed 87 in Q2 2025.
  • William Blair & Company's portfolio value rose 8.6% quarter-over-quarter to $36B.

Based on William Blair & Company's 13F filing for Q2 2025, filed 24 Jul 2025.