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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 | |
|---|---|---|---|---|---|---|
676
Dominion Energy
D
$59.2B
| $2.63M | 0.01% |
44,835
+1,495
| +3% | +$90.1K |
|
677
Wintrust Financial
WTFC
$10.8B
| $2.62M | 0.01% |
18,752
+142
| +0.8% | +$18.9K |
|
678
Akamai
AKAM
$17B
| $2.6M | 0.01% |
29,778
-3,805
| -11% | -$313K |
|
679
CAVA Group
CAVA
$7.16B
| $2.59M | 0.01% |
44,171
+8,305
| +23% | +$463K |
|
680
Twist Bioscience
TWST
$7.83B
| $2.59M | 0.01% |
81,561
+22,482
| +38% | +$701K |
|
681
Penumbra
PEN
$12.9B
| $2.58M | 0.01% |
8,310
+202
| +2% | +$55.8K |
|
682
HEICO Corp Class A
HEI.A
$37.2B
| $2.58M | 0.01% |
10,212
-104
| -1% | -$25.7K |
|
683
Teradyne
TER
$59.6B
| $2.58M | 0.01% |
13,309
-28
| -0.2% | -$4.8K |
|
684
Brookfield Infrastructure Partners
BIP
$18B
| $2.57M | 0.01% |
74,118
+1,426
| +2% | +$49.7K |
|
685
iShares ESG Optimized MSCI USA ETF
SUSA
$4.17B
| $2.57M | 0.01% |
18,464
-120
| -0.6% | -$16.6K |
|
686
Freeport-McMoran
FCX
$96.4B
| $2.56M | 0.01% |
50,405
-3,568
| -7% | -$155K |
|
|
RAL
687
Ralliant Corp
RAL
$7.9B
| $2.54M | 0.01% |
49,907
-10,738
| -18% | -$503K |
|
688
iShares Russell Mid-Cap Value ETF
IWS
$15.9B
| $2.52M | 0.01% |
17,858
-3,168
| -15% | -$443K |
|
689
Agnico Eagle Mines
AEM
$92.4B
| $2.51M | 0.01% |
14,793
-2,458
| -14% | -$413K |
|
690
Conagra Brands
CAG
$7.12B
| $2.51M | 0.01% |
144,856
+8,621
| +6% | +$153K |
|
691
Astera Labs
ALAB
$54.1B
| $2.5M | 0.01% |
15,047
+4,860
| +48% | +$813K |
|
692
iShares 0-1 Year Treasury Bond ETF
SHV
$20.6B
| $2.5M | 0.01% |
22,714
+1,084
| +5% | +$120K |
|
693
PACCAR
PCAR
$69.4B
| $2.48M | 0.01% |
22,616
-433
| -2% | -$44.4K |
|
694
Schwab U.S Small- Cap ETF
SCHA
$23.1B
| $2.47M | 0.01% |
86,748
-53,778
| -38% | -$1.52M |
|
695
Innovator US Equity Power Buffer ETF November
PNOV
$895M
| $2.46M | 0.01% |
58,985
+27,193
| +86% | +$1.13M |
|
696
Klaviyo
KVYO
$5.22B
| $2.44M | 0.01% |
75,137
-163,639
| -69% | -$4.58M |
|
697
Byline Bancorp
BY
$1.75B
| $2.42M | 0.01% |
82,939
+3,815
| +5% | +$107K |
|
|
NTSK
698
Netskope Inc
NTSK
$6.2B
| $2.41M | 0.01% |
+137,138
| New | +$2.86M |
|
699
Blackstone Secured Lending
BXSL
$5.7B
| $2.4M | 0.01% |
91,270
-21,003
| -19% | -$564K |
|
|
NVO
700
Novo Nordisk
NVO
$207B
| $2.35M | 0.01% |
46,270
+9,982
| +28% | +$510K |
|
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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.