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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
CRS icon
901
Carpenter Technology
CRS
$27.1B
$1.13M ﹤0.01%
3,597
-211
-6% -$63.5K
VGSH icon
902
Vanguard Short-Term Treasury ETF
VGSH
$30.2B
$1.13M ﹤0.01%
19,280
+658
+4% +$38.7K
HAS icon
903
Hasbro
HAS
$13.8B
$1.13M ﹤0.01%
13,784
-1,230
-8% -$96.4K
RELY icon
904
Remitly
RELY
$4.99B
$1.13M ﹤0.01%
81,885
+6,522
+9% +$94.8K
SCHV
905
Schwab US Large-Cap Value ETF
SCHV
$16.1B
$1.13M ﹤0.01%
38,122
-3,408
-8% -$99.6K
OSK icon
906
Oshkosh
OSK
$9.66B
$1.13M ﹤0.01%
8,957
+292
+3% +$37.6K
ICF icon
907
iShares Select U.S. REIT ETF
ICF
$2.08B
$1.12M ﹤0.01%
18,786
+141
+0.8% +$8.56K
GBCI icon
908
Glacier Bancorp
GBCI
$6.38B
$1.11M ﹤0.01%
+25,175
New +$1.1M
ENS icon
909
EnerSys
ENS
$6.9B
$1.11M ﹤0.01%
7,544
-25
-0.3% -$3.34K
VTES icon
910
Vanguard Short-Term Tax-Exempt Bond ETF
VTES
$2.23B
$1.1M ﹤0.01%
10,854
+1,895
+21% +$192K
JCI icon
911
Johnson Controls International
JCI
$93.3B
$1.1M ﹤0.01%
9,165
-3,723
-29% -$427K
TLT icon
912
iShares 20+ Year Treasury Bond ETF
TLT
$40.6B
$1.1M ﹤0.01%
12,586
+785
+7% +$70.2K
QBTS icon
913
D-Wave Quantum Inc. Common Stock
QBTS
$7.39B
$1.1M ﹤0.01%
41,899
+6,582
+19% +$192K
GUNR icon
914
FlexShares Global Upstream Natural Resources Index Fund
GUNR
$7.08B
$1.1M ﹤0.01%
23,890
+18,583
+350% +$824K
SUSB icon
915
iShares ESG Aware 1-5 Year USD Corporate Bond ETF
SUSB
$1.3B
$1.08M ﹤0.01%
42,909
+433
+1% +$10.9K
APG icon
916
APi Group
APG
$18.6B
$1.08M ﹤0.01%
28,280
-2,271
-7% -$84K
GRID
917
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$12.2B
$1.08M ﹤0.01%
7,055
+3,942
+127% +$605K
BKR icon
918
Baker Hughes
BKR
$64B
$1.08M ﹤0.01%
23,683
+14,762
+165% +$700K
MMSI icon
919
Merit Medical Systems
MMSI
$5.44B
$1.07M ﹤0.01%
12,181
+82
+0.7% +$6.98K
JEF icon
920
Jefferies Financial Group
JEF
$12.8B
$1.07M ﹤0.01%
17,239
+279
+2% +$16K
FALN icon
921
iShares Fallen Angels USD Bond ETF
FALN
$1.6B
$1.07M ﹤0.01%
39,123
+3,345
+9% +$91.8K
ASTH icon
922
Astrana Health
ASTH
$1.75B
$1.06M ﹤0.01%
+42,901
New +$1.14M
FXY icon
923
Invesco CurrencyShares Japanese Yen Trust
FXY
$426M
$1.06M ﹤0.01%
+18,136
New +$1.08M
PPLT
924
abrdn Physical Platinum Shares ETF
PPLT
$2.04B
$1.06M ﹤0.01%
56,690
+26,210
+86% +$404K
AER icon
925
AerCap
AER
$23.6B
$1.06M ﹤0.01%
7,340
+803
+12% +$106K
35 36
37
38 39

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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.