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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
VBK icon
401
Vanguard Morningstar Small-Cap Growth ETF
VBK
$24.8B
$8.45M 0.02%
28,389
+177
+0.6% +$51.1K
TRV icon
402
Travelers Companies
TRV
$77.2B
$8.44M 0.02%
30,237
+480
+2% +$129K
NVS icon
403
Novartis
NVS
$290B
$8.43M 0.02%
65,726
-381
-0.6% -$46.5K
TECH icon
404
Bio-Techne
TECH
$11.3B
$8.35M 0.02%
150,089
+51,223
+52% +$2.74M
VTWO icon
405
Vanguard Russell 2000 ETF
VTWO
$17.4B
$8.27M 0.02%
84,571
-7,286
-8% -$676K
GEHC icon
406
GE HealthCare
GEHC
$32.6B
$8.23M 0.02%
109,618
-35,503
-24% -$2.65M
SCHI icon
407
Schwab 5-10 Year Corporate Bond ETF
SCHI
$11.5B
$8.17M 0.02%
353,955
+218,781
+162% +$4.99M
DCI icon
408
Donaldson
DCI
$11.2B
$8.15M 0.02%
99,626
+4,053
+4% +$306K
PTLO icon
409
Portillo's
PTLO
$345M
$8.15M 0.02%
1,263,916
-363,399
-22% -$3.07M
IVE icon
410
iShares S&P 500 Value ETF
IVE
$50B
$8.1M 0.02%
39,236
+902
+2% +$181K
BP icon
411
BP
BP
$111B
$8.1M 0.02%
235,001
-9,646
-4% -$323K
UPS icon
412
United Parcel Service
UPS
$88.4B
$8.03M 0.02%
96,123
-25,315
-21% -$2.29M
SCHB icon
413
Schwab US Broad Market ETF
SCHB
$44.9B
$8.02M 0.02%
311,890
+14,664
+5% +$363K
HURN icon
414
Huron Consulting
HURN
$2.39B
$7.98M 0.02%
54,397
+867
+2% +$118K
BR icon
415
Broadridge
BR
$19.3B
$7.96M 0.02%
33,420
-388
-1% -$96.6K
VNOM icon
416
Viper Energy
VNOM
$15.2B
$7.92M 0.02%
207,333
+184,018
+789% +$7.01M
USMV icon
417
iShares MSCI USA Min Vol Factor ETF
USMV
$24.4B
$7.91M 0.02%
83,185
-5,529
-6% -$518K
RF icon
418
Regions Financial
RF
$26.9B
$7.91M 0.02%
299,906
+373
+0.1% +$9.69K
TTEK icon
419
Tetra Tech
TTEK
$9.09B
$7.88M 0.02%
235,949
+3,575
+2% +$130K
SLV icon
420
iShares Silver Trust
SLV
$31.8B
$7.85M 0.02%
185,371
+158,623
+593% +$5.7M
SOXX icon
421
iShares Semiconductor ETF
SOXX
$46.2B
$7.69M 0.02%
28,349
-1,182
-4% -$295K
EXAS
422
DELISTED
Exact Sciences
EXAS
$7.63M 0.02%
139,494
-24,493
-15% -$1.22M
PHYS icon
423
Sprott Physical Gold
PHYS
$16B
$7.62M 0.02%
257,356
-1,000
-0.4% -$26.6K
BINC icon
424
BlackRock Flexible Income ETF
BINC
$16.3B
$7.56M 0.02%
141,930
+102,533
+260% +$5.42M
TIP icon
425
iShares TIPS Bond ETF
TIP
$14.7B
$7.53M 0.02%
67,691
+983
+1% +$109K
15 16
17
18 19

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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.