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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
+1.73%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
AUM
$37.3B
AUM Growth
-$310M
Cap. Flow
-$212M
Cap. Flow %
-0.57%
Top 10 Hldgs %
27.41%
Holding
1,963
New
120
Increased
759
Reduced
753
Closed
96

Top Buys

Rank Stock Value
1
BWXT icon
BWX Technologies
BWXT
+$46.6M
2
META icon
Meta Platforms (Facebook)
META
+$38.3M
3
NOW icon
ServiceNow
NOW
+$37.6M
4
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$32.4M
5
GLD icon
SPDR Gold Trust
GLD
+$29.4M

Top Sells

Rank Stock Value
1
FISV
Fiserv Inc
FISV
+$114M
2
CSGP icon
CoStar Group
CSGP
+$78.3M
3
CWAN
Clearwater Analytics
CWAN
+$75.3M
4
POOL icon
Pool Corp
POOL
+$54M
5
ZTS icon
Zoetis
ZTS
+$51.3M

Sector Composition

Rank Sector Weight
1 Technology 25.8%
2 Financials 13.4%
3 Industrials 12.04%
4 Healthcare 11.22%
5 Communication Services 7.63%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
NULV icon
1551
Nuveen ESG Large-Cap Value ETF
NULV
$2.29B
$109K ﹤0.01%
2,428
– –
EWY icon
1552
iShares MSCI South Korea ETF
EWY
$25.3B
$106K ﹤0.01%
1,089
-26
-2% -$2.38K
QS icon
1553
QuantumScape Corp
QS
$3.72B
$106K ﹤0.01%
10,150
+91
+0.9% +$1.25K
BITO icon
1554
ProShares Bitcoin Strategy ETF
BITO
$1.44B
$105K ﹤0.01%
8,660
-2,556
-23% -$40.1K
TAN icon
1555
Invesco Solar ETF
TAN
$1.37B
$104K ﹤0.01%
2,114
-386
-15% -$18.6K
FXL icon
1556
First Trust Technology AlphaDEX Fund
FXL
$2.8B
$103K ﹤0.01%
615
– –
XJR icon
1557
iShares ESG Screened S&P Small-Cap ETF
XJR
$189M
$103K ﹤0.01%
2,418
+39
+2% +$1.66K
OPPE
1558
WisdomTree European Opportunities Fund
OPPE
$294M
$103K ﹤0.01%
2,000
-500
-20% -$24.9K
VERU icon
1559
Veru
VERU
$43.7M
$103K ﹤0.01%
48,000
+10,000
+26% +$29.8K
DBEU icon
1560
Xtrackers MSCI Europe Hedged Equity ETF
DBEU
$798M
$100K ﹤0.01%
2,091
+1
+0% +$47
PID icon
1561
Invesco International Dividend Achievers ETF
PID
$915M
$100K ﹤0.01%
4,560
– –
COOK icon
1562
Traeger
COOK
$172M
$100K ﹤0.01%
1,854
+308
+20% +$15K
SJNK icon
1563
State Street SPDR Bloomberg Short Term High Yield Bond ETF
SJNK
$4.79B
$99.1K ﹤0.01%
3,912
+141
+4% +$3.58K
SLS icon
1564
SELLAS Life Sciences
SLS
$2.23B
$98K ﹤0.01%
26,002
+10,000
+62% +$19.4K
VTHR icon
1565
Vanguard Russell 3000 ETF
VTHR
$4.85B
$97.6K ﹤0.01%
325
+50
+18% +$14.9K
KELYA icon
1566
Kelly Services Class A
KELYA
$538M
$96.8K ﹤0.01%
11,003
+3
+0% +$31
GIFT
1567
Giftify Inc
GIFT
$31.5M
$95.2K ﹤0.01%
86,553
-8,447
-9% -$9.17K
PRTH icon
1568
Priority Technology Holdings
PRTH
$434M
$95.2K ﹤0.01%
+17,461
New +$108K
SVV icon
1569
Savers
SVV
$1.91B
$93.4K ﹤0.01%
+10,000
New +$103K
PIO icon
1570
Invesco Global Water ETF
PIO
$280M
$93.3K ﹤0.01%
2,113
– –
AREC icon
1571
American Resources Corp
AREC
$301M
$92.4K ﹤0.01%
+37,275
New +$124K
FLRN icon
1572
State Street SPDR Bloomberg Investment Grade Floating Rate ETF
FLRN
$2.97B
$92.2K ﹤0.01%
3,000
-1,126
-27% -$34.7K
SPHD icon
1573
Invesco S&P 500 High Dividend Low Volatility ETF
SPHD
$3.38B
$91.7K ﹤0.01%
1,909
-2,742
-59% -$132K
WTV icon
1574
WisdomTree US Value Fund
WTV
$3.36B
$91.2K ﹤0.01%
978
– –
KOS icon
1575
Kosmos Energy
KOS
$1.52B
$90.7K ﹤0.01%
100,000
– –
61 62
63
64 65

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William Blair & Company's Q4 2025 Portfolio in Review

As of Q4 2025, William Blair & Company held 1,963 positions worth $37.3B, down 0.82% from $37.6B the previous quarter. Its ten largest holdings account for 27% of the portfolio.

William Blair & Company's Q4 2025 filing shows 120 new, 759 increased, 753 reduced and 96 closed positions. Its largest new stake was Wingstop: 90,773 shares worth $21.6M. The largest sale was Fiserv Inc, an estimated $114M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q4 2025 buy was Wingstop: 90,773 shares worth $21.6M.
  • William Blair & Company added most to BWX Technologies in Q4 2025, an estimated $46.6M increase.
  • William Blair & Company's biggest Q4 2025 reduction was Fiserv Inc, cutting an estimated $114M.
  • William Blair & Company fully exited SAP in Q4 2025, selling an estimated $9.19M.
  • William Blair & Company's ten largest holdings make up 27% of its $37.3B portfolio in Q4 2025.
  • William Blair & Company opened 120 new positions and closed 96 in Q4 2025.
  • William Blair & Company's portfolio value fell 0.82% quarter-over-quarter to $37.3B.

Based on William Blair & Company's 13F filing for Q4 2025, filed 17 Feb 2026.