We are live on ! Find out more
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
+1.73%
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
$37.3B
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
DASH icon
726
DoorDash
DASH
$92.6B
$2.17M 0.01%
9,559
+4,745
+99% +$1.11M
RBLX icon
727
Roblox
RBLX
$26.2B
$2.16M 0.01%
26,650
+14,355
+117% +$1.52M
GAIN icon
728
Gladstone Investment Corp
GAIN
$661M
$2.16M 0.01%
154,482
-10,432
-6% -$145K
FLS icon
729
Flowserve
FLS
$10.2B
$2.15M 0.01%
30,952
+8,496
+38% +$546K
DLB icon
730
Dolby
DLB
$5.8B
$2.14M 0.01%
33,375
-6,655
-17% -$447K
MTUM icon
731
iShares MSCI USA Momentum Factor ETF
MTUM
$25.4B
$2.14M 0.01%
8,531
+738
+9% +$185K
IMCG icon
732
iShares Morningstar Mid-Cap Growth ETF
IMCG
$4.13B
$2.12M 0.01%
26,543
+1,547
+6% +$126K
AFL icon
733
Aflac
AFL
$61B
$2.12M 0.01%
19,200
+2,073
+12% +$228K
DFUV icon
734
Dimensional US Marketwide Value ETF
DFUV
$15.9B
$2.1M 0.01%
45,135
+136
+0.3% +$6.17K
VYMI icon
735
Vanguard International High Dividend Yield ETF
VYMI
$21.2B
$2.09M 0.01%
23,194
+5,012
+28% +$435K
WTW icon
736
Willis Towers Watson
WTW
$31.9B
$2.08M 0.01%
6,316
-625
-9% -$205K
BRSP
737
BrightSpire Capital
BRSP
$628M
$2.08M 0.01%
+370,564
New +$2.04M
APO icon
738
Apollo Global Management
APO
$80.6B
$2.07M 0.01%
14,332
-38,913
-73% -$5.17M
VFH icon
739
Vanguard Financials ETF
VFH
$13.9B
$2.07M 0.01%
15,480
-199
-1% -$25.8K
FCNCA icon
740
First Citizens BancShares
FCNCA
$25.3B
$2.06M 0.01%
960
-5
-0.5% -$9.42K
LFUS icon
741
Littelfuse
LFUS
$11.7B
$2.06M 0.01%
8,148
-549
-6% -$140K
PSN icon
742
Parsons
PSN
$5.09B
$2.05M 0.01%
33,107
+609
+2% +$47.7K
MDLN
743
Medline Inc
MDLN
$30.1B
$2.02M 0.01%
+48,050
New +$2.03M
LPLA icon
744
LPL Financial
LPLA
$29.5B
$1.99M 0.01%
5,577
+3,655
+190% +$1.29M
HHS icon
745
Harte-Hanks
HHS
$18.5M
$1.99M 0.01%
660,845
– –
MPLX icon
746
MPLX
MPLX
$60B
$1.98M 0.01%
37,144
+2,602
+8% +$136K
MRCC
747
DELISTED
Monroe Capital Corp
MRCC
$1.97M 0.01%
309,750
-55,054
-15% -$365K
OTIS icon
748
Otis Worldwide
OTIS
$27.9B
$1.97M 0.01%
22,587
-105
-0.5% -$9.39K
IBB icon
749
iShares Biotechnology ETF
IBB
$9.82B
$1.97M 0.01%
11,676
-166
-1% -$27K
EXC icon
750
Exelon
EXC
$46.2B
$1.96M 0.01%
45,004
-6,697
-13% -$306K
28 29
30
31 32

Similar funds

Empower Advisory Group
Empower Advisory Group Greenwood Village, Colorado $38.5B AUM 18.4% 1-Year Est. Return
Parallax Volatility Advisers
Parallax Volatility Advisers San Francisco, California $38.6B AUM 45.89% 1-Year Est. Return
Credit Agricole
Credit Agricole Montrouge Cedex, France $38.1B AUM
Carson Wealth (CWM LLC)
Carson Wealth (CWM LLC) Omaha, Nebraska $38.1B AUM 19.66% 1-Year Est. Return
Nomura Asset Management
Nomura Asset Management Tokyo, Japan $38.8B AUM 30.94% 1-Year Est. Return
Nomura Holdings
Nomura Holdings Tokyo, Japan $37.7B AUM 34.44% 1-Year Est. Return
Fayez Sarofim & Co
Fayez Sarofim & Co Houston, Texas $39.1B AUM 15.14% 1-Year Est. Return
Grantham, Mayo, Van Otterloo & Co (GMO)
Grantham, Mayo, Van Otterloo & Co (GMO) Boston, Massachusetts $39.1B AUM 28.69% 1-Year Est. Return

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.