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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
EFX icon
226
Equifax
EFX
$21.2B
$21.6M 0.06%
84,368
+3,643
+5% +$916K
DVY icon
227
iShares Select Dividend ETF
DVY
$23.7B
$20.9M 0.06%
147,170
+8,783
+6% +$1.22M
DKNG icon
228
DraftKings
DKNG
$12.7B
$20.7M 0.06%
553,574
-3,001
-0.5% -$133K
CMI icon
229
Cummins
CMI
$87.8B
$20.3M 0.05%
48,090
+3,108
+7% +$1.19M
CEG icon
230
Constellation Energy
CEG
$98.7B
$20.3M 0.05%
61,600
+8,433
+16% +$2.72M
XYZ
231
Block Inc
XYZ
$47B
$20.1M 0.05%
277,645
-59,151
-18% -$4.43M
TWLO icon
232
Twilio
TWLO
$37.9B
$20M 0.05%
199,568
+5,028
+3% +$566K
DOCU
233
DocuSign
DOCU
$11.1B
$19.7M 0.05%
273,740
-119,594
-30% -$9.22M
PAYX icon
234
Paychex
PAYX
$42.8B
$19.7M 0.05%
155,435
-6,429
-4% -$892K
ESGD icon
235
iShares ESG Aware MSCI EAFE ETF
ESGD
$12.3B
$19.6M 0.05%
211,068
+22,070
+12% +$2M
CL icon
236
Colgate-Palmolive
CL
$73.6B
$19.4M 0.05%
242,445
-3,223
-1% -$275K
FIS icon
237
Fidelity National Information Services
FIS
$21.6B
$19M 0.05%
288,622
-21,100
-7% -$1.54M
PAUG icon
238
Innovator US Equity Power Buffer ETF August
PAUG
$935M
$18.9M 0.05%
444,382
+85,414
+24% +$3.55M
CBZ icon
239
CBIZ
CBZ
$2.96B
$18.7M 0.05%
352,712
-81,786
-19% -$5.27M
DGX icon
240
Quest Diagnostics
DGX
$26.2B
$18.7M 0.05%
97,918
+6,709
+7% +$1.19M
NTRS icon
241
Northern Trust
NTRS
$35B
$18.6M 0.05%
138,556
-3,013
-2% -$388K
ROP icon
242
Roper Technologies
ROP
$39.1B
$18.6M 0.05%
37,278
+3,754
+11% +$2M
BLBD icon
243
Blue Bird Corp
BLBD
$2.04B
$18.5M 0.05%
320,972
-5,963
-2% -$311K
BMY icon
244
Bristol-Myers Squibb
BMY
$130B
$18.3M 0.05%
405,640
-53,545
-12% -$2.5M
CHDN icon
245
Churchill Downs
CHDN
$6.17B
$17.8M 0.05%
183,840
+9,402
+5% +$967K
DIA icon
246
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$48.2B
$17.8M 0.05%
38,411
-12,470
-25% -$5.62M
LMT icon
247
Lockheed Martin
LMT
$140B
$17.7M 0.05%
35,547
-6,746
-16% -$3.06M
XMTR icon
248
Xometry
XMTR
$5.34B
$17.7M 0.05%
324,565
+58,707
+22% +$2.55M
KMB icon
249
Kimberly-Clark
KMB
$36.2B
$17.7M 0.05%
142,093
-23,491
-14% -$3.04M
SPHQ icon
250
Invesco S&P 500 Quality ETF
SPHQ
$19.9B
$17.7M 0.05%
240,995
+18,845
+8% +$1.36M
8 9
10
11 12

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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.