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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
MCHI icon
1526
iShares MSCI China ETF
MCHI
$6.42B
$134K ﹤0.01%
2,227
+1
+0% +$63
XIFR
1527
XPLR Infrastructure LP
XIFR
$1.07B
$133K ﹤0.01%
13,340
-300
-2% -$2.91K
SIL icon
1528
Global X Silver Miners ETF NEW
SIL
$4.83B
$132K ﹤0.01%
+1,580
New +$117K
IGIB icon
1529
iShares 5-10 Year Investment Grade Corporate Bond ETF
IGIB
$18.5B
$132K ﹤0.01%
2,441
-691
-22% -$37.4K
VIOG icon
1530
Vanguard S&P Small-Cap 600 Growth ETF
VIOG
$1.12B
$129K ﹤0.01%
1,065
– –
ONDS icon
1531
Ondas Inc
ONDS
$5.31B
$129K ﹤0.01%
+13,202
New +$106K
PBR icon
1532
Petrobras
PBR
$118B
$129K ﹤0.01%
10,861
-296
-3% -$3.61K
DGS icon
1533
WisdomTree Emerging Markets SmallCap Dividend Fund
DGS
$1.77B
$128K ﹤0.01%
2,243
– –
NXE icon
1534
NexGen Energy
NXE
$6.91B
$128K ﹤0.01%
13,921
– –
RWL icon
1535
Invesco S&P 500 Revenue ETF
RWL
$9.95B
$128K ﹤0.01%
1,117
– –
TMC icon
1536
TMC The Metals Company
TMC
$1.92B
$128K ﹤0.01%
20,670
-30,880
-60% -$217K
CODI icon
1537
Compass Diversified
CODI
$834M
$127K ﹤0.01%
26,471
-15,938
-38% -$101K
HYGV icon
1538
FlexShares High Yield Value-Scored Bond Index Fund
HYGV
$1.1B
$127K ﹤0.01%
+3,117
New +$127K
SCHP icon
1539
Schwab US TIPS ETF
SCHP
$16.2B
$125K ﹤0.01%
4,703
-564
-11% -$15.1K
BLV icon
1540
Vanguard Long-Term Bond ETF
BLV
$5.69B
$124K ﹤0.01%
1,788
-38
-2% -$2.69K
PCY icon
1541
Invesco Emerging Markets Sovereign Debt ETF
PCY
$1.39B
$123K ﹤0.01%
5,678
+64
+1% +$1.39K
RPV icon
1542
Invesco S&P 500 Pure Value ETF
RPV
$1.72B
$122K ﹤0.01%
1,183
-500
-30% -$50.4K
SCHH icon
1543
Schwab US REIT ETF
SCHH
$11.2B
$121K ﹤0.01%
5,809
+630
+12% +$13.4K
LZ icon
1544
LegalZoom.com
LZ
$973M
$121K ﹤0.01%
12,185
-1,401
-10% -$13.9K
AMCR icon
1545
Amcor
AMCR
$21.8B
$119K ﹤0.01%
+2,850
New +$118K
PSEC icon
1546
Prospect Capital
PSEC
$1.15B
$118K ﹤0.01%
45,700
– –
EWW icon
1547
iShares MSCI Mexico ETF
EWW
$1.91B
$116K ﹤0.01%
1,673
– –
AEF
1548
abrdn Emerging Markets Equity Income Fund
AEF
$364M
$116K ﹤0.01%
16,547
+14
+0.1% +$95
FEZ icon
1549
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.54B
$113K ﹤0.01%
1,755
+155
+10% +$9.78K
REAX icon
1550
Real Brokerage
REAX
$466M
$110K ﹤0.01%
30,000
– –
60 61
62
63 64

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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.