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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
MPWR icon
376
Monolithic Power Systems
MPWR
$70B
$9.37M 0.03%
10,182
+1,195
+13% +$969K
VKTX icon
377
Viking Therapeutics
VKTX
$3.97B
$9.35M 0.02%
355,926
+25,919
+8% +$773K
ZM icon
378
Zoom
ZM
$30.8B
$9.32M 0.02%
113,018
+12,588
+13% +$982K
DLN icon
379
WisdomTree US LargeCap Dividend Fund
DLN
$6.42B
$9.29M 0.02%
106,715
+93,559
+711% +$7.92M
CCOI icon
380
Cogent Communications
CCOI
$525M
$9.23M 0.02%
240,796
+4,276
+2% +$179K
EFG icon
381
iShares MSCI EAFE Growth ETF
EFG
$17.4B
$9.23M 0.02%
81,037
-590
-0.7% -$65.8K
SAP icon
382
SAP
SAP
$236B
$9.19M 0.02%
+34,403
New +$9.67M
TTWO icon
383
Take-Two Interactive
TTWO
$45.4B
$9.15M 0.02%
35,422
+2,362
+7% +$559K
BN icon
384
Brookfield
BN
$110B
$9.13M 0.02%
199,731
-4,440
-2% -$197K
FTV icon
385
Fortive
FTV
$18.6B
$9.04M 0.02%
184,469
-85,193
-32% -$4.2M
ONT
386
Onterris Inc
ONT
$576M
$9.03M 0.02%
328,976
-21,155
-6% -$553K
ELF icon
387
e.l.f. Beauty
ELF
$5.47B
$9.01M 0.02%
68,027
-6,672
-9% -$823K
MAR icon
388
Marriott International
MAR
$92.5B
$8.99M 0.02%
34,513
+71
+0.2% +$19.1K
XYL icon
389
Xylem
XYL
$28.5B
$8.86M 0.02%
60,078
+11,478
+24% +$1.59M
TSCO icon
390
Tractor Supply
TSCO
$19B
$8.86M 0.02%
155,775
+345
+0.2% +$20.3K
XLC icon
391
State Street Communication Services Select Sector SPDR ETF
XLC
$22.3B
$8.82M 0.02%
74,471
-288
-0.4% -$32K
ESGV icon
392
Vanguard ESG US Stock ETF
ESGV
$13.6B
$8.79M 0.02%
74,251
+34,930
+89% +$3.98M
PFEB icon
393
Innovator US Equity Power Buffer ETF February
PFEB
$925M
$8.78M 0.02%
221,095
-8,554
-4% -$332K
VUSB icon
394
Vanguard Ultra-Short Bond ETF
VUSB
$9.33B
$8.77M 0.02%
175,396
+1,069
+0.6% +$53.3K
SMH icon
395
VanEck Semiconductor ETF
SMH
$72B
$8.66M 0.02%
26,549
-42,307
-61% -$12.5M
VIGI icon
396
Vanguard International Dividend Appreciation ETF
VIGI
$9.28B
$8.66M 0.02%
96,643
+13,584
+16% +$1.21M
MPC icon
397
Marathon Petroleum
MPC
$97.8B
$8.54M 0.02%
44,310
-1,096
-2% -$193K
BIV icon
398
Vanguard Intermediate-Term Bond ETF
BIV
$28.8B
$8.5M 0.02%
108,904
-1,137
-1% -$88K
COWZ icon
399
Pacer US Cash Cows 100 ETF
COWZ
$19.6B
$8.5M 0.02%
147,880
-13,159
-8% -$748K
STIP icon
400
iShares 0-5 Year TIPS Bond ETF
STIP
$15.9B
$8.48M 0.02%
82,027
+14,669
+22% +$1.51M
14 15
16
17 18

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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.