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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
(-0.82%)
Cap. Flow
-$212M
Cap. Flow
% of AUM
-0.57%
Top 10 Holdings %
Top 10 Hldgs %
27.41%
Holding
1,963
New
120
Increased
759
Reduced
753
Closed
96
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
BWX Technologies
BWXT
|
+$46.6M |
| 2 |
Meta Platforms (Facebook)
META
|
+$38.3M |
| 3 |
ServiceNow
NOW
|
+$37.6M |
| 4 |
Vanguard FTSE All-World ex-US ETF
VEU
|
+$32.4M |
| 5 |
SPDR Gold Trust
GLD
|
+$29.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
FISV
Fiserv Inc
FISV
|
+$114M |
| 2 |
CoStar Group
CSGP
|
+$78.3M |
| 3 |
CWAN
Clearwater Analytics
CWAN
|
+$75.3M |
| 4 |
Pool Corp
POOL
|
+$54M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
776
Jabil
JBL
$37.1B
| $1.78M | ﹤0.01% |
7,808
+1,024
| +15% | +$218K |
|
777
Ford
F
$56.3B
| $1.78M | ﹤0.01% |
135,515
-8,977
| -6% | -$116K |
|
778
First Solar
FSLR
$25.8B
| $1.78M | ﹤0.01% |
6,802
-113
| -2% | -$28.5K |
|
779
Invesco S&P 500 Low Volatility ETF
SPLV
$7.18B
| $1.77M | ﹤0.01% |
24,830
+5,053
| +26% | +$363K |
|
780
Elevance Health
ELV
$84.8B
| $1.76M | ﹤0.01% |
5,029
-1,158
| -19% | -$391K |
|
781
Toll Brothers
TOL
$14.3B
| $1.75M | ﹤0.01% |
12,975
+939
| +8% | +$127K |
|
782
CRISPR Therapeutics
CRSP
$5.19B
| $1.75M | ﹤0.01% |
33,424
-315
| -0.9% | -$18.9K |
|
783
Eversource Energy
ES
$26.8B
| $1.74M | ﹤0.01% |
25,855
-6,189
| -19% | -$435K |
|
784
Mueller Industries
MLI
$15.2B
| $1.73M | ﹤0.01% |
30,110
+1,182
| +4% | +$63.6K |
|
785
Zimmer Biomet
ZBH
$18.6B
| $1.69M | ﹤0.01% |
18,848
-4,223
| -18% | -$400K |
|
786
iShares MSCI Canada ETF
EWC
$6.49B
| $1.69M | ﹤0.01% |
31,357
-1,299
| -4% | -$67.2K |
|
787
State Street SPDR Portfolio S&P 500 Value ETF
SPYV
$36.6B
| $1.69M | ﹤0.01% |
29,761
+7,549
| +34% | +$424K |
|
788
Vanguard Total Bond Market
BND
$161B
| $1.69M | ﹤0.01% |
22,772
+1,147
| +5% | +$85.4K |
|
789
Eaton Vance Tax-Managed Global Diversified Equity Income Fund
EXG
$3.08B
| $1.68M | ﹤0.01% |
176,178
-3,797
| -2% | -$34.9K |
|
790
Public Service Enterprise Group
PEG
$37.5B
| $1.68M | ﹤0.01% |
20,889
+696
| +3% | +$56.8K |
|
791
PIMCO Enhanced Short Maturity Active Exchange-Traded Fund
MINT
$17.1B
| $1.67M | ﹤0.01% |
16,682
+169
| +1% | +$17K |
|
792
iShares US Financials ETF
IYF
$4.42B
| $1.67M | ﹤0.01% |
12,980
-38
| -0.3% | -$4.75K |
|
793
Pure Cycle
PCYO
$275M
| $1.67M | ﹤0.01% |
152,192
-2,341
| -2% | -$26.2K |
|
794
VSE Corp
VSEC
$6.6B
| $1.67M | ﹤0.01% |
9,660
-145
| -1% | -$24.8K |
|
795
Vanguard Energy ETF
VDE
$10.4B
| $1.66M | ﹤0.01% |
13,180
-196
| -1% | -$24.6K |
|
796
Celsius Holdings
CELH
$6.91B
| $1.66M | ﹤0.01% |
36,222
+4,981
| +16% | +$251K |
|
797
Old Republic International
ORI
$10.3B
| $1.65M | ﹤0.01% |
36,194
+1,487
| +4% | +$64.5K |
|
798
Cellebrite
CLBT
$4.05B
| $1.65M | ﹤0.01% |
91,587
+2,162
| +2% | +$38.8K |
|
799
Glaukos
GKOS
$10.8B
| $1.63M | ﹤0.01% |
14,458
-5,051
| -26% | -$483K |
|
800
Innovator US Equity Power Buffer ETF March
PMAR
$769M
| $1.61M | ﹤0.01% |
35,895
| – | – |
|
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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.