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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 | |
|---|---|---|---|---|---|---|
951
Leonardo DRS
DRS
$11.8B
| $971K | ﹤0.01% |
28,487
-1,169
| -4% | -$43.1K |
|
952
Core Scientific Inc Tranche 1 Warrants
CORZW
$1.28B
| $969K | ﹤0.01% |
114,509
| – | – |
|
953
Huntington Ingalls Industries
HII
$13B
| $954K | ﹤0.01% |
2,804
+281
| +11% | +$87.2K |
|
954
Bank of Montreal
BMO
$128B
| $953K | ﹤0.01% |
7,343
-643
| -8% | -$81.4K |
|
955
NextNav
NN
$2.08B
| $948K | ﹤0.01% |
57,000
| – | – |
|
956
NXP Semiconductors
NXPI
$60.3B
| $948K | ﹤0.01% |
4,366
-948
| -18% | -$203K |
|
957
Citizens Financial Group
CFG
$30.7B
| $947K | ﹤0.01% |
16,216
+467
| +3% | +$25.1K |
|
958
Comstock Resources
CRK
$4.15B
| $940K | ﹤0.01% |
40,572
+11,075
| +38% | +$244K |
|
|
JAMF
959
DELISTED
Jamf
JAMF
| $937K | ﹤0.01% |
72,055
-226,215
| -76% | -$2.75M |
|
960
iShares S&P Small-Cap 600 Value ETF
IJS
$8.33B
| $935K | ﹤0.01% |
8,219
-80
| -1% | -$8.97K |
|
961
Civista Bancshares
CIVB
$590M
| $933K | ﹤0.01% |
42,000
| – | – |
|
962
Factset
FDS
$10.1B
| $931K | ﹤0.01% |
3,210
+1,086
| +51% | +$305K |
|
963
VanEck Agribusiness ETF
MOO
$977M
| $921K | ﹤0.01% |
12,658
+355
| +3% | +$25.8K |
|
964
Albemarle
ALB
$15.4B
| $916K | ﹤0.01% |
6,474
+260
| +4% | +$29.5K |
|
965
Innovator US Equity Buffer ETF February
BFEB
$259M
| $906K | ﹤0.01% |
18,621
| – | – |
|
966
Seagate
STX
$186B
| $903K | ﹤0.01% |
3,279
-519
| -14% | -$135K |
|
967
Yum China
YUMC
$16.3B
| $897K | ﹤0.01% |
18,782
-43
| -0.2% | -$1.97K |
|
968
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$5.3B
| $885K | ﹤0.01% |
28,147
+3,915
| +16% | +$123K |
|
969
nVent Electric
NVT
$26.9B
| $882K | ﹤0.01% |
8,653
+596
| +7% | +$61.9K |
|
970
Center Bancorp
CNOB
$1.78B
| $880K | ﹤0.01% |
33,570
| – | – |
|
971
United Therapeutics
UTHR
$22.6B
| $877K | ﹤0.01% |
1,800
+510
| +40% | +$238K |
|
972
State Street SPDR S&P International Small Cap ETF
GWX
$919M
| $875K | ﹤0.01% |
21,418
+390
| +2% | +$15.7K |
|
973
Impact Shares NAACP Minority Empowerment ETF
NACP
$76.9M
| $869K | ﹤0.01% |
17,638
+12
| +0.1% | +$587 |
|
974
Vanguard FTSE All-World ex-US Small-Cap Index Fund
VSS
$12B
| $860K | ﹤0.01% |
6,002
+182
| +3% | +$25.9K |
|
975
DraftKings
DKNG
$12.6B
| $855K | ﹤0.01% |
24,812
-528,762
| -96% | -$17.4M |
|
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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.