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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
AVPT icon
1476
AvePoint
AVPT
$2.75B
$190K ﹤0.01%
13,700
+1,050
+8% +$14.5K
EVEX icon
1477
Eve Holding
EVEX
$990M
$188K ﹤0.01%
47,017
– –
UMAC icon
1478
Unusual Machines
UMAC
$1.36B
$187K ﹤0.01%
+14,700
New +$172K
CLOV icon
1479
Clover Health Investments
CLOV
$2.41B
$187K ﹤0.01%
79,500
– –
CGW icon
1480
Invesco S&P Global Water Index ETF
CGW
$1.07B
$185K ﹤0.01%
2,941
+37
+1% +$2.37K
EEMV icon
1481
iShares MSCI Emerging Markets Min Vol Factor ETF
EEMV
$3.54B
$185K ﹤0.01%
2,887
+1,121
+63% +$72.3K
SUSC icon
1482
iShares ESG Aware USD Corporate Bond ETF
SUSC
$1.29B
$184K ﹤0.01%
7,860
-2,550
-24% -$60K
XSMO icon
1483
Invesco S&P SmallCap Momentum ETF
XSMO
$3.09B
$184K ﹤0.01%
2,551
+1,777
+230% +$129K
IXC icon
1484
iShares Global Energy ETF
IXC
$2.72B
$181K ﹤0.01%
4,327
– –
IEV icon
1485
iShares Europe ETF
IEV
$1.7B
$180K ﹤0.01%
2,622
– –
VMBS icon
1486
Vanguard Mortgage-Backed Securities ETF
VMBS
$15.6B
$178K ﹤0.01%
3,782
+52
+1% +$2.45K
RGT
1487
Royce Global Value Trust
RGT
$102M
$177K ﹤0.01%
13,520
– –
NEPH icon
1488
Nephros
NEPH
$47.6M
$177K ﹤0.01%
36,249
– –
SAN icon
1489
Banco Santander
SAN
$210B
$174K ﹤0.01%
14,796
+4,606
+45% +$48.9K
EVH icon
1490
Evolent Health
EVH
$444M
$173K ﹤0.01%
43,206
-395,725
-90% -$2.2M
RSPF icon
1491
Invesco S&P 500 Equal Weight Financials ETF
RSPF
$309M
$173K ﹤0.01%
2,200
-150
-6% -$11.5K
JMIA
1492
Jumia Technologies
JMIA
$743M
$171K ﹤0.01%
13,700
-2,500
-15% -$28.9K
SPTL icon
1493
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$10.7B
$171K ﹤0.01%
6,463
+1,471
+29% +$39.7K
VMD icon
1494
Viemed Healthcare
VMD
$355M
$171K ﹤0.01%
23,000
– –
BTBT icon
1495
Bit Digital
BTBT
$454M
$170K ﹤0.01%
90,000
– –
VRP icon
1496
Invesco Variable Rate Preferred ETF
VRP
$3.01B
$170K ﹤0.01%
6,986
+501
+8% +$12.3K
LMBS icon
1497
First Trust Exchange-Traded Fund IV First Trust Low Duration Opportunities ETF
LMBS
$6.38B
$170K ﹤0.01%
3,391
+2,734
+416% +$137K
IYE icon
1498
iShares US Energy ETF
IYE
$1.78B
$169K ﹤0.01%
3,551
+5
+0.1% +$237
BMAY icon
1499
Innovator US Equity Buffer ETF May
BMAY
$236M
$166K ﹤0.01%
3,708
– –
LENZ
1500
LENZ Therapeutics
LENZ
$168M
$163K ﹤0.01%
10,207
+2,215
+28% +$64.6K
58 59
60
61 62

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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.