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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
XLK icon
201
State Street Technology Select Sector SPDR ETF
XLK
$122B
$24.8M 0.07%
196,230
+48,088
+32% +$5.34M
TWLO icon
202
Twilio
TWLO
$29.2B
$24.2M 0.07%
194,540
-6,115
-3% -$650K
PSX icon
203
Phillips 66
PSX
$81.9B
$24.1M 0.07%
201,721
+18,900
+10% +$2.12M
AVAV icon
204
AeroVironment
AVAV
$8.67B
$24M 0.07%
84,348
+35,348
+72% +$5.98M
DKNG icon
205
DraftKings
DKNG
$10.7B
$23.9M 0.07%
556,575
-5,279
-0.9% -$189K
FOUR icon
206
Shift4
FOUR
$3.44B
$23.6M 0.07%
237,991
+6,569
+3% +$573K
PAYX icon
207
Paychex
PAYX
$42.5B
$23.5M 0.07%
161,864
+8,486
+6% +$1.28M
RDVY icon
208
First Trust Rising Dividend Achievers ETF
RDVY
$25.5B
$23.1M 0.06%
367,543
+16,989
+5% +$999K
XYZ
209
Block Inc
XYZ
$47.2B
$22.9M 0.06%
336,796
-1,364,093
-80% -$79.4M
DVAX
210
DELISTED
Dynavax Technologies
DVAX
$22.6M 0.06%
2,279,647
+6,940
+0.3% +$73.1K
DIA icon
211
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46.4B
$22.4M 0.06%
50,881
-1,441
-3% -$598K
CL icon
212
Colgate-Palmolive
CL
$73.8B
$22.3M 0.06%
245,668
-7,901
-3% -$721K
VOE icon
213
Vanguard Morningstar Mid-Cap Value ETF
VOE
$23.9B
$22.2M 0.06%
135,003
+5,061
+4% +$801K
VGT icon
214
Vanguard Information Technology ETF
VGT
$147B
$22.2M 0.06%
267,600
-46,056
-15% -$3.35M
TROW icon
215
T. Rowe Price
TROW
$24.3B
$22.1M 0.06%
228,706
+5,965
+3% +$548K
TSM icon
216
TSMC
TSM
$2.18T
$22M 0.06%
97,202
+3,191
+3% +$591K
MS icon
217
Morgan Stanley
MS
$340B
$21.6M 0.06%
153,663
-3,436
-2% -$422K
FTNT icon
218
Fortinet
FTNT
$117B
$21.4M 0.06%
202,463
+876
+0.4% +$88.4K
PLTR icon
219
Palantir
PLTR
$375B
$21.4M 0.06%
156,685
+87,290
+126% +$10.2M
KMB icon
220
Kimberly-Clark
KMB
$36.3B
$21.3M 0.06%
165,584
-27,761
-14% -$3.76M
BMY icon
221
Bristol-Myers Squibb
BMY
$130B
$21.3M 0.06%
459,185
-222,590
-33% -$10.9M
WFC icon
222
Wells Fargo
WFC
$266B
$21.1M 0.06%
263,735
-18,990
-7% -$1.37M
AFRM icon
223
Affirm
AFRM
$25.9B
$21.1M 0.06%
+304,959
New +$15.8M
MKL icon
224
Markel Group
MKL
$23.2B
$20.9M 0.06%
10,488
+405
+4% +$759K
EFX icon
225
Equifax
EFX
$20.7B
$20.9M 0.06%
80,725
+22,724
+39% +$5.78M
7 8
9
10 11

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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.