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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
CSCO icon
126
Cisco
CSCO
$479B
$63.1M 0.17%
818,903
+3,102
+0.4% +$230K
WAB icon
127
Wabtec
WAB
$49.3B
$63M 0.17%
294,951
-17,286
-6% -$3.55M
ADP icon
128
Automatic Data Processing
ADP
$108B
$62.8M 0.17%
244,279
-6,123
-2% -$1.63M
GE icon
129
GE Aerospace
GE
$384B
$62.6M 0.17%
203,336
-24,750
-11% -$7.45M
DE icon
130
Deere & Co
DE
$168B
$61.3M 0.16%
131,689
-13,891
-10% -$6.52M
TOST icon
131
Toast
TOST
$19.9B
$58.9M 0.16%
1,658,477
+42,412
+3% +$1.53M
BAC icon
132
Bank of America
BAC
$442B
$57.8M 0.16%
1,050,709
-3,903
-0.4% -$206K
AXON
133
Axon Enterprise
AXON
$46.4B
$57.8M 0.16%
101,737
+2,829
+3% +$1.76M
GWW icon
134
W.W. Grainger
GWW
$60.2B
$54.4M 0.15%
53,886
-3,518
-6% -$3.41M
AMGN icon
135
Amgen
AMGN
$222B
$53.7M 0.14%
164,196
+1,957
+1% +$621K
HON icon
136
Honeywell
HON
$78B
$52.5M 0.14%
269,361
-4,017
-1% -$786K
COIN icon
137
Coinbase
COIN
$40.5B
$52.4M 0.14%
231,887
+65,347
+39% +$19.5M
RDVY icon
138
First Trust Rising Dividend Achievers ETF
RDVY
$25.6B
$52.3M 0.14%
753,309
+174,985
+30% +$11.9M
IWD icon
139
iShares Russell 1000 Value ETF
IWD
$83.9B
$52.3M 0.14%
248,735
+11,020
+5% +$2.28M
EMR icon
140
Emerson Electric
EMR
$88.3B
$50.6M 0.14%
381,205
+10,256
+3% +$1.36M
TJX icon
141
TJX Companies
TJX
$178B
$50.3M 0.14%
327,676
-43,268
-12% -$6.4M
SDVY icon
142
First Trust SMID Cap Rising Dividend Achievers ETF
SDVY
$11.8B
$50.1M 0.13%
1,307,551
+27,025
+2% +$1.03M
BRK.A icon
143
Berkshire Hathaway Class A
BRK.A
$1.12T
$49.8M 0.13%
66
+1
+2% +$746K
IOT icon
144
Samsara
IOT
$23.8B
$46.9M 0.13%
1,322,946
+536,165
+68% +$20.8M
USFR icon
145
WisdomTree Floating Rate Treasury Fund
USFR
$18.4B
$46.4M 0.12%
921,644
-50,504
-5% -$2.54M
FANG icon
146
Diamondback Energy
FANG
$52.7B
$45.7M 0.12%
304,186
+84,649
+39% +$12.5M
MDY icon
147
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27.1B
$45.5M 0.12%
75,368
-1,733
-2% -$1.04M
GILD icon
148
Gilead Sciences
GILD
$165B
$45.3M 0.12%
368,930
-8,434
-2% -$1.02M
RMD icon
149
ResMed
RMD
$30.7B
$45.3M 0.12%
187,917
-35,926
-16% -$9.19M
MSI icon
150
Motorola Solutions
MSI
$77.4B
$44.2M 0.12%
115,268
-63,299
-35% -$25.4M
4 5
6
7 8

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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.