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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
KBH icon
1351
KB Home
KBH
$3.44B
$261K ﹤0.01%
4,100
– –
M icon
1352
Macy's
M
$6.26B
$261K ﹤0.01%
14,550
+418
+3% +$5.92K
AMPX icon
1353
Amprius Technologies
AMPX
$1.75B
$261K ﹤0.01%
+24,788
New +$195K
SPAB icon
1354
State Street SPDR Portfolio Aggregate Bond ETF
SPAB
$9.96B
$260K ﹤0.01%
10,060
-31
-0.3% -$793
IOO icon
1355
iShares Global 100 ETF
IOO
$9.45B
$259K ﹤0.01%
2,162
– –
PLXS icon
1356
Plexus
PLXS
$7.13B
$259K ﹤0.01%
+1,792
New +$242K
IYZ icon
1357
iShares US Telecommunications ETF
IYZ
$1.24B
$258K ﹤0.01%
8,007
-166
-2% -$5.11K
DLS icon
1358
WisdomTree International SmallCap Dividend Fund
DLS
$1.08B
$258K ﹤0.01%
3,246
+1
+0% +$78
INVH icon
1359
Invitation Homes
INVH
$18B
$257K ﹤0.01%
8,764
-80
-0.9% -$2.47K
BCS icon
1360
Barclays
BCS
$94.8B
$257K ﹤0.01%
+12,434
New +$246K
RPRX icon
1361
Royalty Pharma
RPRX
$26B
$256K ﹤0.01%
7,263
+462
+7% +$16.7K
NTES icon
1362
NetEase
NTES
$78.2B
$256K ﹤0.01%
+1,685
New +$232K
XBAP icon
1363
Innovator US Equity Accelerated 9 Buffer ETF April
XBAP
$133M
$256K ﹤0.01%
6,757
– –
VRSN icon
1364
VeriSign
VRSN
$25.8B
$255K ﹤0.01%
912
-2
-0.2% -$559
PFG icon
1365
Principal Financial Group
PFG
$24.6B
$254K ﹤0.01%
3,068
-139
-4% -$11.1K
PTRN
1366
Pattern Group Inc
PTRN
$4B
$253K ﹤0.01%
+18,500
New +$258K
SWKS icon
1367
Skyworks Solutions
SWKS
$10.5B
$253K ﹤0.01%
3,290
-121
-4% -$9.01K
FTC icon
1368
First Trust Large Cap Growth AlphaDEX Fund
FTC
$1.41B
$253K ﹤0.01%
1,575
– –
WCLD
1369
WisdomTree Cloud Computing Fund
WCLD
$307M
$253K ﹤0.01%
7,195
– –
PDSB icon
1370
PDS Biotechnology
PDSB
$13.1M
$253K ﹤0.01%
250,000
– –
NICE icon
1371
Nice
NICE
$5.85B
$252K ﹤0.01%
1,742
+498
+40% +$74.7K
HLI icon
1372
Houlihan Lokey
HLI
$8.76B
$251K ﹤0.01%
+1,223
New +$240K
CNC icon
1373
Centene
CNC
$32.8B
$251K ﹤0.01%
+7,038
New +$213K
NFG icon
1374
National Fuel Gas
NFG
$7.72B
$251K ﹤0.01%
2,717
– –
EXPE icon
1375
Expedia Group
EXPE
$39.3B
$250K ﹤0.01%
1,169
-43
-4% -$8.63K
53 54
55
56 57

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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.