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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
PFEB icon
376
Innovator US Equity Power Buffer ETF February
PFEB
$927M
$8.73M 0.02%
229,649
+1,187
+0.5% +$43.1K
EXAS
377
DELISTED
Exact Sciences
EXAS
$8.71M 0.02%
163,987
-50,482
-24% -$2.56M
VUSB icon
378
Vanguard Ultra-Short Bond ETF
VUSB
$8.92B
$8.69M 0.02%
174,327
-970
-0.6% -$48.2K
BIV icon
379
Vanguard Intermediate-Term Bond ETF
BIV
$28.9B
$8.51M 0.02%
110,041
+4,653
+4% +$354K
CMCSA icon
380
Comcast
CMCSA
$90B
$8.49M 0.02%
237,917
-26,536
-10% -$918K
OPRX icon
381
OptimizeRx
OPRX
$133M
$8.49M 0.02%
628,926
-2,105
-0.3% -$23K
OMC icon
382
Omnicom Group
OMC
$23.4B
$8.44M 0.02%
117,373
+315
+0.3% +$23.3K
BN icon
383
Brookfield
BN
$108B
$8.42M 0.02%
204,171
+35,910
+21% +$1.33M
TTEK icon
384
Tetra Tech
TTEK
$9.07B
$8.36M 0.02%
232,374
+106,412
+84% +$3.54M
USMV icon
385
iShares MSCI USA Min Vol Factor ETF
USMV
$24.2B
$8.33M 0.02%
88,714
+1,120
+1% +$103K
TPL icon
386
Texas Pacific Land
TPL
$23.5B
$8.26M 0.02%
23,466
-519
-2% -$212K
KVYO icon
387
Klaviyo
KVYO
$4.73B
$8.24M 0.02%
245,255
+14,102
+6% +$447K
XBI icon
388
State Street SPDR S&P Biotech ETF
XBI
$10.3B
$8.23M 0.02%
99,220
-38,301
-28% -$3.06M
BR icon
389
Broadridge
BR
$19B
$8.22M 0.02%
33,808
-1,075
-3% -$255K
NOC icon
390
Northrop Grumman
NOC
$81.2B
$8.2M 0.02%
16,405
-266
-2% -$131K
TSCO icon
391
Tractor Supply
TSCO
$18.1B
$8.2M 0.02%
155,430
-36,615
-19% -$1.87M
PAR icon
392
PAR Technology
PAR
$735M
$8.15M 0.02%
117,458
-9,429
-7% -$589K
XLC icon
393
State Street Communication Services Select Sector SPDR ETF
XLC
$22.4B
$8.11M 0.02%
74,759
+156
+0.2% +$15.4K
TTWO icon
394
Take-Two Interactive
TTWO
$46.1B
$8.03M 0.02%
33,060
-1,012
-3% -$228K
VTWO icon
395
Vanguard Russell 2000 ETF
VTWO
$17.9B
$8.01M 0.02%
91,857
+60,330
+191% +$4.91M
NVS icon
396
Novartis
NVS
$297B
$8M 0.02%
66,107
-10,415
-14% -$1.17M
TRV icon
397
Travelers Companies
TRV
$80.2B
$7.96M 0.02%
29,757
-977
-3% -$258K
CRDF icon
398
Cardiff Oncology
CRDF
$77.2M
$7.95M 0.02%
2,524,118
+772,844
+44% +$2.36M
MOD icon
399
Modine Manufacturing
MOD
$10.4B
$7.94M 0.02%
80,634
+16,641
+26% +$1.49M
FND icon
400
Floor & Decor
FND
$6.68B
$7.92M 0.02%
104,239
+25,344
+32% +$1.88M
14 15
16
17 18

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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.