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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
+7.16%
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
$37.6B
AUM Growth
+$1.57B
(+4.4%)
Cap. Flow
-$160M
Cap. Flow
% of AUM
-0.43%
Top 10 Holdings %
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Meta Platforms (Facebook)
META
|
+$76.1M |
| 2 |
Applovin
APP
|
+$75.3M |
| 3 |
ServiceNow
NOW
|
+$66.6M |
| 4 |
CWAN
Clearwater Analytics
CWAN
|
+$65.8M |
| 5 |
Diamondback Energy
FANG
|
+$30.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
CYBR
CyberArk
CYBR
|
+$70.7M |
| 2 |
Adobe
ADBE
|
+$61.7M |
| 3 |
Microsoft
MSFT
|
+$45.7M |
| 4 |
Workday
WDAY
|
+$42.6M |
| 5 |
Pool Corp
POOL
|
+$41.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 27.36% |
| 2 | Financials | 13.36% |
| 3 | Industrials | 12.59% |
| 4 | Healthcare | 10.97% |
| 5 | Consumer Discretionary | 7.45% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
726
Dimensional US Marketwide Value ETF
DFUV
$16B
| $2.01M | 0.01% |
44,999
-332
| -0.7% | -$14.5K |
|
|
CRWV
727
CoreWeave
CRWV
$59.5B
| $2.01M | 0.01% |
14,670
+10,954
| +295% | +$1.3M |
|
728
Elevance Health
ELV
$86.3B
| $2M | 0.01% |
6,187
-73
| -1% | -$22.7K |
|
729
Option Care Health
OPCH
$3.61B
| $2M | 0.01% |
72,015
-6,678
| -8% | -$193K |
|
730
iShares MSCI USA Momentum Factor ETF
MTUM
$26.2B
| $2M | 0.01% |
7,793
+298
| +4% | +$73K |
|
731
Astera Labs
ALAB
$56.7B
| $1.99M | 0.01% |
10,187
-2,788
| -21% | -$458K |
|
732
eBay
EBAY
$46.2B
| $1.97M | 0.01% |
21,701
+63
| +0.3% | +$5.57K |
|
733
iShares Core MSCI Total International Stock ETF
IXUS
$60.9B
| $1.97M | 0.01% |
23,849
+1,448
| +6% | +$115K |
|
734
iShares US Real Estate ETF
IYR
$4.58B
| $1.97M | 0.01% |
20,284
+243
| +1% | +$23.4K |
|
735
Biogen
BIIB
$31.1B
| $1.96M | 0.01% |
14,020
-824
| -6% | -$111K |
|
736
Arm
ARM
$303B
| $1.96M | 0.01% |
13,871
-3,446
| -20% | -$502K |
|
737
Schwab Fundamental US Large Company Index ETF
FNDX
$27.6B
| $1.95M | 0.01% |
74,293
+46,236
| +165% | +$1.17M |
|
738
Keysight
KEYS
$60.5B
| $1.94M | 0.01% |
11,099
-130
| -1% | -$21.7K |
|
739
M&T Bank
MTB
$36.7B
| $1.94M | 0.01% |
9,804
+5
| +0.1% | +$981 |
|
740
iShares MSCI EAFE Small-Cap ETF
SCZ
$13.6B
| $1.94M | 0.01% |
25,251
+239
| +1% | +$17.9K |
|
741
Aflac
AFL
$60.7B
| $1.91M | 0.01% |
17,127
-1,860
| -10% | -$195K |
|
742
Fluor
FLR
$7.01B
| $1.9M | 0.01% |
45,097
+35,462
| +368% | +$1.63M |
|
743
Vanguard S&P Mid-Cap 400 Growth ETF
IVOG
$1.73B
| $1.89M | 0.01% |
15,854
+35
| +0.2% | +$4.1K |
|
744
United Airlines
UAL
$41.2B
| $1.89M | 0.01% |
19,541
-1,682
| -8% | -$162K |
|
745
Freshpet
FRPT
$3.5B
| $1.88M | 0.01% |
34,138
+13,946
| +69% | +$864K |
|
746
SLB Ltd
SLB
$77.3B
| $1.87M | 0.01% |
54,535
-4,828
| -8% | -$168K |
|
747
Primoris Services
PRIM
$4.37B
| $1.87M | 0.01% |
13,639
+9,720
| +248% | +$1.04M |
|
748
Innovator US Equity Power Buffer ETF May
PMAY
$820M
| $1.86M | 0.01% |
47,831
-1,763
| -4% | -$67.6K |
|
749
Norwegian Cruise Line
NCLH
$8.91B
| $1.85M | ﹤0.01% |
75,175
-88,318
| -54% | -$2.15M |
|
750
American Water Works
AWK
$27.1B
| $1.85M | ﹤0.01% |
13,296
-257
| -2% | -$36.3K |
|
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William Blair & Company's Q3 2025 Portfolio in Review
As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.
William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.
By sector, the portfolio is most concentrated in Technology at 27% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.
- William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
- William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
- William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
- William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
- William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
- William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
- William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.
Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.