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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 | |
|---|---|---|---|---|---|---|
801
Norwegian Cruise Line
NCLH
$8.56B
| $1.61M | ﹤0.01% |
72,157
-3,018
| -4% | -$63.7K |
|
802
Cooper Companies
COO
$15B
| $1.61M | ﹤0.01% |
19,590
+6,835
| +54% | +$512K |
|
803
Ligand Pharmaceuticals
LGND
$5.82B
| $1.6M | ﹤0.01% |
8,474
+88
| +1% | +$16.9K |
|
804
Churchill Downs
CHDN
$6.19B
| $1.6M | ﹤0.01% |
14,067
-169,773
| -92% | -$17.6M |
|
805
Hubbell
HUBB
$27.4B
| $1.6M | ﹤0.01% |
3,602
+142
| +4% | +$62.2K |
|
806
Invesco S&P 500 Equal Weight Technology ETF
RSPT
$5.85B
| $1.59M | ﹤0.01% |
34,881
| – | – |
|
807
JPMorgan BetaBuilders Europe ETF
BBEU
$9.5B
| $1.58M | ﹤0.01% |
21,598
+82
| +0.4% | +$5.83K |
|
808
AvalonBay Communities
AVB
$26.2B
| $1.58M | ﹤0.01% |
8,717
-739
| -8% | -$134K |
|
809
iShares S&P Small-Cap 600 Growth ETF
IJT
$8.4B
| $1.58M | ﹤0.01% |
11,182
+707
| +7% | +$100K |
|
810
Warner Bros
WBD
$68B
| $1.58M | ﹤0.01% |
54,651
-776
| -1% | -$18.1K |
|
|
FIG
811
Figma
FIG
$13.3B
| $1.57M | ﹤0.01% |
42,108
+33,244
| +375% | +$1.5M |
|
812
Vanguard S&P 500 Growth ETF
VOOG
$27.1B
| $1.56M | ﹤0.01% |
21,090
+2,532
| +14% | +$186K |
|
813
American Water Works
AWK
$26.9B
| $1.55M | ﹤0.01% |
11,849
-1,447
| -11% | -$193K |
|
814
State Street SPDR Portfolio Short Term Corporate Bond ETF
SPSB
$10.8B
| $1.54M | ﹤0.01% |
51,077
+1,585
| +3% | +$47.9K |
|
815
Constellation Brands
STZ
$22.6B
| $1.54M | ﹤0.01% |
11,171
-8,181
| -42% | -$1.12M |
|
816
Vanguard Russell 1000 Growth ETF
VONG
$45.4B
| $1.53M | ﹤0.01% |
12,605
+81
| +0.6% | +$9.88K |
|
|
HEDG
817
Equable Shares Hedged Equity ETF
HEDG
$440M
| $1.53M | ﹤0.01% |
+52,182
| New | +$1.52M |
|
818
State Street Consumer Staples Select Sector SPDR ETF
XLP
$14.6B
| $1.53M | ﹤0.01% |
19,679
+667
| +4% | +$52.1K |
|
819
iShares Preferred and Income Securities ETF
PFF
$13.2B
| $1.53M | ﹤0.01% |
49,357
+1,740
| +4% | +$54.2K |
|
820
VanEck Junior Gold Miners ETF
GDXJ
$8.46B
| $1.52M | ﹤0.01% |
13,325
-535
| -4% | -$55.3K |
|
821
Delta Air Lines
DAL
$59.7B
| $1.51M | ﹤0.01% |
21,770
-3,026
| -12% | -$189K |
|
822
State Street SPDR Portfolio S&P 600 Small Cap ETF
SPSM
$17.5B
| $1.51M | ﹤0.01% |
32,223
-4,063
| -11% | -$189K |
|
|
HOLX
823
DELISTED
Hologic
HOLX
| $1.5M | ﹤0.01% |
20,073
-37,732
| -65% | -$2.76M |
|
824
Nutrien
NTR
$32B
| $1.49M | ﹤0.01% |
24,172
-1,984
| -8% | -$117K |
|
825
FlexShares Quality Dividend Defensive Index Fund
QDEF
$561M
| $1.49M | ﹤0.01% |
18,395
+356
| +2% | +$28.6K |
|
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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.