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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
NWG icon
1401
NatWest
NWG
$76.8B
$231K ﹤0.01%
+16,338
New +$231K
CCNE icon
1402
CNB Financial Corp
CCNE
$1.04B
$230K ﹤0.01%
9,523
+7
+0.1% +$173
SNSR icon
1403
Global X Internet of Things ETF
SNSR
$225M
$230K ﹤0.01%
5,907
+7
+0.1% +$267
XME icon
1404
State Street SPDR S&P Metals & Mining ETF
XME
$4.46B
$230K ﹤0.01%
2,472
-55
-2% -$4.39K
SPHD icon
1405
Invesco S&P 500 High Dividend Low Volatility ETF
SPHD
$3.42B
$230K ﹤0.01%
4,651
+1,881
+68% +$91.7K
TILT icon
1406
FlexShares Morningstar US Market Factors Tilt Index Fund
TILT
$2.27B
$230K ﹤0.01%
949
– –
SMR icon
1407
NuScale Power
SMR
$3.92B
$230K ﹤0.01%
+6,378
New +$254K
DON icon
1408
WisdomTree US MidCap Dividend Fund
DON
$4.1B
$229K ﹤0.01%
4,383
-1,575
-26% -$81.6K
IVOV icon
1409
Vanguard S&P Mid-Cap 400 Value ETF
IVOV
$1.37B
$229K ﹤0.01%
2,273
– –
FUSB icon
1410
First US Bancshares
FUSB
$92.3M
$228K ﹤0.01%
19,000
-18,000
-49% -$223K
PIPR icon
1411
Piper Sandler
PIPR
$5.35B
$228K ﹤0.01%
+2,628
New +$214K
VFC icon
1412
VF Corp
VFC
$5.73B
$228K ﹤0.01%
15,783
+159
+1% +$2.14K
VONE icon
1413
Vanguard Russell 1000 ETF
VONE
$8.71B
$227K ﹤0.01%
752
– –
SRAD icon
1414
Sportradar
SRAD
$3.97B
$227K ﹤0.01%
8,425
+1,250
+17% +$37.1K
LUMN icon
1415
Lumen
LUMN
$6.45B
$226K ﹤0.01%
37,008
+10,883
+42% +$52.2K
CBT icon
1416
Cabot Corp
CBT
$4.44B
$226K ﹤0.01%
+2,971
New +$232K
CSL icon
1417
Carlisle Companies
CSL
$14.9B
$226K ﹤0.01%
687
+90
+15% +$34.3K
APTV icon
1418
Aptiv
APTV
$10.1B
$226K ﹤0.01%
+2,617
New +$197K
QLD icon
1419
ProShares Ultra QQQ
QLD
$14.4B
$224K ﹤0.01%
3,272
– –
FNDA icon
1420
Schwab Fundamental US Small Company Index ETF
FNDA
$9.41B
$224K ﹤0.01%
7,202
-781
-10% -$23.7K
GFI icon
1421
Gold Fields
GFI
$35.3B
$224K ﹤0.01%
+5,335
New +$165K
RGTI icon
1422
Rigetti Computing
RGTI
$6.23B
$222K ﹤0.01%
+7,449
New +$131K
VOYA icon
1423
Voya Financial
VOYA
$9.09B
$222K ﹤0.01%
2,964
-10
-0.3% -$737
EMB icon
1424
iShares JPMorgan USD Emerging Markets Bond ETF
EMB
$15B
$221K ﹤0.01%
2,320
-55
-2% -$5.15K
BITO icon
1425
ProShares Bitcoin Strategy ETF
BITO
$1.43B
$221K ﹤0.01%
11,216
+1,104
+11% +$23K
55 56
57
58 59

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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.