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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
HHS icon
651
Harte-Hanks
HHS
$2.63M 0.01%
660,845
– –
ELS icon
652
Equity Lifestyle Properties
ELS
$12.6B
$2.63M 0.01%
42,618
– –
SUSA icon
653
iShares ESG Optimized MSCI USA ETF
SUSA
$4.18B
$2.6M 0.01%
20,542
-465
-2% -$54.8K
XEL icon
654
Xcel Energy
XEL
$48.8B
$2.6M 0.01%
38,183
+151
+0.4% +$10.5K
MEDP icon
655
Medpace
MEDP
$16.5B
$2.6M 0.01%
8,269
-25,146
-75% -$7.55M
CAVA icon
656
CAVA Group
CAVA
$7.27B
$2.59M 0.01%
30,752
-76,118
-71% -$6.49M
STRL icon
657
Sterling Infrastructure
STRL
$16.7B
$2.58M 0.01%
11,203
-297
-3% -$51.9K
ROST icon
658
Ross Stores
ROST
$81.9B
$2.56M 0.01%
20,048
+15
+0.1% +$2.08K
OPCH icon
659
Option Care Health
OPCH
$3.56B
$2.56M 0.01%
78,693
+31,821
+68% +$1.03M
STZ icon
660
Constellation Brands
STZ
$23.2B
$2.55M 0.01%
15,646
-993
-6% -$178K
BRO icon
661
Brown & Brown
BRO
$23.9B
$2.52M 0.01%
22,692
+621
+3% +$69.8K
MRCC
662
DELISTED
Monroe Capital Corp
MRCC
$2.51M 0.01%
394,580
-26,923
-6% -$180K
GMS
663
DELISTED
GMS Inc
GMS
$2.5M 0.01%
23,000
-2,000
-8% -$155K
RY icon
664
Royal Bank of Canada
RY
$293B
$2.48M 0.01%
18,881
+47
+0.2% +$5.75K
IMCG icon
665
iShares Morningstar Mid-Cap Growth ETF
IMCG
$4.09B
$2.46M 0.01%
30,694
+478
+2% +$35.5K
NEOG icon
666
Neogen
NEOG
$2.5B
$2.46M 0.01%
514,603
-1,049,220
-67% -$6.02M
RHI icon
667
Robert Half
RHI
$4.37B
$2.46M 0.01%
59,920
-6,875
-10% -$313K
OTIS icon
668
Otis Worldwide
OTIS
$28.2B
$2.45M 0.01%
24,770
+3,121
+14% +$301K
VST icon
669
Vistra
VST
$47.4B
$2.45M 0.01%
12,629
+3,566
+39% +$528K
BCO icon
670
Brink's
BCO
$4.62B
$2.45M 0.01%
27,404
-1,433
-5% -$125K
SNA icon
671
Snap-on
SNA
$21.5B
$2.44M 0.01%
7,834
– –
ELV icon
672
Elevance Health
ELV
$85.5B
$2.43M 0.01%
6,260
+180
+3% +$72.4K
MAIN icon
673
Main Street Capital
MAIN
$5.48B
$2.43M 0.01%
41,172
– –
FCX icon
674
Freeport-McMoran
FCX
$97.5B
$2.43M 0.01%
56,092
-16,735
-23% -$636K
CF icon
675
CF Industries
CF
$17.3B
$2.43M 0.01%
26,420
-4,016
-13% -$342K
25 26
27
28 29

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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.