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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 | |
|---|---|---|---|---|---|---|
|
BELFB
851
Bel Fuse Inc Class B
BELFB
$4.19B
| $1.36M | ﹤0.01% |
8,025
| – | – |
|
852
CF Industries
CF
$17.8B
| $1.36M | ﹤0.01% |
17,528
+116
| +0.7% | +$9.53K |
|
853
Kenvue
KVUE
$36.6B
| $1.35M | ﹤0.01% |
78,480
-63,997
| -45% | -$1.05M |
|
854
Ventas
VTR
$44.6B
| $1.35M | ﹤0.01% |
17,407
+265
| +2% | +$20K |
|
855
Harrow
HROW
$1.47B
| $1.34M | ﹤0.01% |
+27,403
| New | +$1.15M |
|
856
ProShares Ultra S&P500
SSO
$8.35B
| $1.34M | ﹤0.01% |
23,130
+5,374
| +30% | +$307K |
|
857
Natera
NTRA
$45.1B
| $1.34M | ﹤0.01% |
5,835
+119
| +2% | +$24.8K |
|
858
Rocket Companies
RKT
$40.5B
| $1.34M | ﹤0.01% |
68,989
+103
| +0.1% | +$1.84K |
|
859
DTE Energy
DTE
$28.6B
| $1.33M | ﹤0.01% |
10,337
-138
| -1% | -$18.7K |
|
|
JBTM
860
JBT Marel
JBTM
$6.32B
| $1.33M | ﹤0.01% |
8,843
+1,665
| +23% | +$235K |
|
861
Lumentum
LITE
$63.8B
| $1.33M | ﹤0.01% |
3,611
+491
| +16% | +$126K |
|
|
SGI
862
Somnigroup International
SGI
$13.7B
| $1.33M | ﹤0.01% |
+14,873
| New | +$1.3M |
|
863
AptarGroup
ATR
$8.57B
| $1.32M | ﹤0.01% |
10,833
+6,960
| +180% | +$860K |
|
864
Coherent
COHR
$64.3B
| $1.32M | ﹤0.01% |
7,136
+2,336
| +49% | +$349K |
|
865
Transocean
RIG
$6.49B
| $1.31M | ﹤0.01% |
317,114
-1,184
| -0.4% | -$4.6K |
|
866
Brookfield Asset Management
BAM
$88.4B
| $1.31M | ﹤0.01% |
24,989
-2,273
| -8% | -$122K |
|
867
iShares MSCI World ETF
URTH
$8.32B
| $1.3M | ﹤0.01% |
7,014
+350
| +5% | +$64.4K |
|
868
Hartford Financial Services
HIG
$38.1B
| $1.3M | ﹤0.01% |
9,421
-348
| -4% | -$45.9K |
|
869
State Street
STT
$51.4B
| $1.29M | ﹤0.01% |
10,018
-825
| -8% | -$98.8K |
|
870
StepStone Group
STEP
$4.07B
| $1.29M | ﹤0.01% |
20,042
+4,070
| +25% | +$257K |
|
871
Invesco S&P 500 Top 50 ETF
XLG
$10.9B
| $1.28M | ﹤0.01% |
21,624
+145
| +0.7% | +$8.52K |
|
872
VanEck Pharmaceutical ETF
PPH
$996M
| $1.27M | ﹤0.01% |
12,342
+28
| +0.2% | +$2.72K |
|
873
Weyerhaeuser
WY
$18B
| $1.26M | ﹤0.01% |
53,319
-1,344
| -2% | -$31.1K |
|
874
Bentley Systems
BSY
$11B
| $1.26M | ﹤0.01% |
32,912
+13,302
| +68% | +$606K |
|
|
SNDK
875
Sandisk
SNDK
$186B
| $1.26M | ﹤0.01% |
5,287
+17
| +0.3% | +$3.4K |
|
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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.