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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
SN icon
401
SharkNinja
SN
$26.1B
$7.91M 0.02%
79,892
-20,014
-20% -$1.73M
ZM icon
402
Zoom
ZM
$30.6B
$7.83M 0.02%
100,430
-1,785
-2% -$138K
VBK icon
403
Vanguard Morningstar Small-Cap Growth ETF
VBK
$24.5B
$7.81M 0.02%
28,212
-421
-1% -$108K
MSTR icon
404
Strategy Inc
MSTR
$38.4B
$7.72M 0.02%
19,096
+3,245
+20% +$1.18M
ONT
405
Onterris Inc
ONT
$580M
$7.66M 0.02%
350,131
+15,910
+5% +$285K
RSG icon
406
Republic Services
RSG
$66B
$7.64M 0.02%
30,964
+6
+0% +$1.48K
MPC icon
407
Marathon Petroleum
MPC
$83.7B
$7.54M 0.02%
45,406
-4,763
-9% -$714K
SPYM
408
State Street SPDR Portfolio S&P 500 ETF
SPYM
$168B
$7.51M 0.02%
103,321
+1,133
+1% +$76.2K
IVE icon
409
iShares S&P 500 Value ETF
IVE
$49.8B
$7.49M 0.02%
38,334
+342
+0.9% +$63.7K
VIGI icon
410
Vanguard International Dividend Appreciation ETF
VIGI
$9.3B
$7.49M 0.02%
83,059
+10,001
+14% +$864K
LRN icon
411
Stride
LRN
$3.43B
$7.47M 0.02%
51,424
-5,518
-10% -$798K
HURN icon
412
Huron Consulting
HURN
$2.42B
$7.36M 0.02%
53,530
+1,280
+2% +$182K
TIP icon
413
iShares TIPS Bond ETF
TIP
$14.5B
$7.34M 0.02%
66,708
-11,534
-15% -$1.26M
SITE icon
414
SiteOne Landscape Supply
SITE
$4.53B
$7.34M 0.02%
60,683
+18,814
+45% +$2.22M
BP icon
415
BP
BP
$107B
$7.32M 0.02%
244,647
+16,957
+7% +$497K
RKLB icon
416
Rocket Lab Corp
RKLB
$51.8B
$7.25M 0.02%
202,772
+14,799
+8% +$362K
MDT icon
417
Medtronic
MDT
$112B
$7.21M 0.02%
82,679
+442
+0.5% +$37.5K
NTNX icon
418
Nutanix
NTNX
$16.9B
$7.2M 0.02%
94,155
-7,889
-8% -$568K
SCHB icon
419
Schwab US Broad Market ETF
SCHB
$44.9B
$7.08M 0.02%
297,226
-2,448
-0.8% -$53.9K
SOXX icon
420
iShares Semiconductor ETF
SOXX
$48.7B
$7.05M 0.02%
29,531
+8,394
+40% +$1.68M
RF icon
421
Regions Financial
RF
$26.8B
$7.05M 0.02%
299,533
+49,841
+20% +$1.05M
USB icon
422
US Bancorp
USB
$99.6B
$7.02M 0.02%
155,090
+15
+0% +$631
IHI icon
423
iShares US Medical Devices ETF
IHI
$3.38B
$6.99M 0.02%
111,527
+3,320
+3% +$200K
STIP icon
424
iShares 0-5 Year TIPS Bond ETF
STIP
$15.8B
$6.93M 0.02%
67,358
+1,313
+2% +$135K
XLY icon
425
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$23.2B
$6.91M 0.02%
63,628
+1,374
+2% +$141K
15 16
17
18 19

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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.