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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
SAN icon
1551
Banco Santander
SAN
$211B
$107K ﹤0.01%
10,190
+34
+0.3% +$317
NULV icon
1552
Nuveen ESG Large-Cap Value ETF
NULV
$2.28B
$106K ﹤0.01%
2,428
– –
FXL icon
1553
First Trust Technology AlphaDEX Fund
FXL
$2.84B
$103K ﹤0.01%
615
– –
XJR icon
1554
iShares ESG Screened S&P Small-Cap ETF
XJR
$190M
$101K ﹤0.01%
2,379
– –
GIFT
1555
Giftify Inc
GIFT
$31.9M
$101K ﹤0.01%
95,000
+70,000
+280% +$75.8K
SPYD icon
1556
State Street SPDR Portfolio S&P 500 High Dividend ETF
SPYD
$7.69B
$101K ﹤0.01%
2,288
– –
FEZ icon
1557
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.55B
$99.4K ﹤0.01%
1,600
– –
PID icon
1558
Invesco International Dividend Achievers ETF
PID
$912M
$97K ﹤0.01%
4,560
– –
SJNK icon
1559
State Street SPDR Bloomberg Short Term High Yield Bond ETF
SJNK
$4.8B
$96.5K ﹤0.01%
3,771
-79
-2% -$2.01K
AOA icon
1560
iShares Core 80/20 Aggressive Allocation ETF
AOA
$3.28B
$96.5K ﹤0.01%
1,095
+36
+3% +$3.07K
DBEU icon
1561
Xtrackers MSCI Europe Hedged Equity ETF
DBEU
$798M
$96.2K ﹤0.01%
2,090
-1,200
-36% -$54.1K
EAGG icon
1562
iShares ESG Aware US Aggregate Bond ETF
EAGG
$4.97B
$95.5K ﹤0.01%
1,989
+118
+6% +$5.61K
PIO icon
1563
Invesco Global Water ETF
PIO
$278M
$94.8K ﹤0.01%
2,113
– –
COOK icon
1564
Traeger
COOK
$172M
$94.3K ﹤0.01%
1,546
+88
+6% +$6.74K
CQQQ icon
1565
Invesco China Technology ETF
CQQQ
$3.24B
$91.6K ﹤0.01%
1,552
-1,100
-41% -$55K
FREL icon
1566
Fidelity MSCI Real Estate Index ETF
FREL
$1.47B
$91K ﹤0.01%
3,274
+18
+0.6% +$496
PKW icon
1567
Invesco BuyBack Achievers ETF
PKW
$1.78B
$89.7K ﹤0.01%
677
– –
EWY icon
1568
iShares MSCI South Korea ETF
EWY
$27.2B
$89.3K ﹤0.01%
1,115
– –
WTV icon
1569
WisdomTree US Value Fund
WTV
$3.36B
$89K ﹤0.01%
978
+734
+301% +$65.4K
XMLV icon
1570
Invesco S&P MidCap Low Volatility ETF
XMLV
$743M
$88K ﹤0.01%
1,385
-10
-0.7% -$627
RWR icon
1571
State Street SPDR Dow Jones REIT ETF
RWR
$1.87B
$87.5K ﹤0.01%
872
+519
+147% +$51K
IZRL icon
1572
ARK Israel Innovative Technology ETF
IZRL
$139M
$87.1K ﹤0.01%
2,990
– –
SPTI icon
1573
State Street SPDR Portfolio Intermediate Term Treasury ETF
SPTI
$10.6B
$86.3K ﹤0.01%
2,987
+165
+6% +$4.74K
CDXS icon
1574
Codexis
CDXS
$175M
$86.1K ﹤0.01%
35,293
-1,537
-4% -$4.19K
GSY icon
1575
Invesco Ultra Short Duration ETF
GSY
$3.88B
$85.7K ﹤0.01%
1,706
+2
+0.1% +$100
61 62
63
64 65

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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.