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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
ACWX icon
226
iShares MSCI ACWI ex US ETF
ACWX
$11.8B
$20.7M 0.06%
340,436
+43,977
+15% +$2.54M
VYM icon
227
Vanguard High Dividend Yield ETF
VYM
$82.7B
$20.1M 0.06%
150,716
+248
+0.2% +$31.4K
CWST icon
228
Casella Waste Systems
CWST
$5.66B
$20M 0.06%
173,525
+21,504
+14% +$2.48M
TW icon
229
Tradeweb Markets
TW
$21.7B
$20M 0.06%
136,537
+10,286
+8% +$1.44M
TDUP icon
230
ThredUp
TDUP
$419M
$19.8M 0.06%
2,645,045
-324,680
-11% -$1.91M
LMT icon
231
Lockheed Martin
LMT
$135B
$19.6M 0.05%
42,293
-11,807
-22% -$5.53M
PLMR icon
232
Palomar
PLMR
$3.55B
$19.6M 0.05%
126,839
-11,952
-9% -$1.85M
MDLZ icon
233
Mondelez International
MDLZ
$80.3B
$19.3M 0.05%
286,420
+2,224
+0.8% +$148K
VMC icon
234
Vulcan Materials
VMC
$36.9B
$19.2M 0.05%
73,643
-185
-0.3% -$47.6K
SMH icon
235
VanEck Semiconductor ETF
SMH
$72.9B
$19.2M 0.05%
68,856
-17,535
-20% -$4.07M
BOKF icon
236
BOK Financial
BOKF
$8.74B
$19.1M 0.05%
195,170
– –
CGDV icon
237
Capital Group Dividend Value ETF
CGDV
$38.8B
$19M 0.05%
482,130
+11,062
+2% +$401K
ROP icon
238
Roper Technologies
ROP
$39.6B
$19M 0.05%
33,524
-185
-0.5% -$105K
PTLO icon
239
Portillo's
PTLO
$320M
$19M 0.05%
1,627,315
+14,303
+0.9% +$165K
KNSL icon
240
Kinsale Capital Group
KNSL
$8.58B
$18.8M 0.05%
38,914
-9,475
-20% -$4.42M
ABNB icon
241
Airbnb
ABNB
$104B
$18.5M 0.05%
139,884
-4,832
-3% -$612K
PCTY icon
242
Paylocity
PCTY
$8.11B
$18.5M 0.05%
101,966
-4,282
-4% -$804K
PH icon
243
Parker-Hannifin
PH
$136B
$18.5M 0.05%
26,439
+3,983
+18% +$2.52M
EQIX icon
244
Equinix
EQIX
$103B
$18.5M 0.05%
23,196
-370
-2% -$314K
DVY icon
245
iShares Select Dividend ETF
DVY
$23.6B
$18.4M 0.05%
138,387
-18,716
-12% -$2.42M
IEMG icon
246
iShares Core MSCI Emerging Markets ETF
IEMG
$155B
$18.2M 0.05%
303,609
+18,081
+6% +$1.01M
IAU icon
247
iShares Gold Trust
IAU
$67.3B
$18.2M 0.05%
291,351
-18,641
-6% -$1.16M
NTRS icon
248
Northern Trust
NTRS
$33.9B
$17.9M 0.05%
141,569
+2,480
+2% +$254K
RCL icon
249
Royal Caribbean
RCL
$85.8B
$17.8M 0.05%
56,984
-15,223
-21% -$3.62M
CHDN icon
250
Churchill Downs
CHDN
$6.06B
$17.6M 0.05%
174,438
+170,093
+3,915% +$16.6M
8 9
10
11 12

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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.