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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 | |
|---|---|---|---|---|---|---|
|
101
Pool Corp
POOL
$7.25B
| $85.8M | 0.23% |
276,725
-133,013
| -32% | -$41.7M |
|
102
Jones Lang LaSalle
JLL
$16.7B
| $84.6M | 0.23% |
283,492
+64,845
| +30% | +$18.5M |
|
103
RBC Bearings
RBC
$17.6B
| $83.1M | 0.22% |
212,904
+3,111
| +1% | +$1.21M |
|
104
RB Global
RBA
$16B
| $82.5M | 0.22% |
761,331
-16,948
| -2% | -$1.9M |
|
105
Motorola Solutions
MSI
$77.7B
| $81.7M | 0.22% |
178,567
-5,670
| -3% | -$2.56M |
|
106
Blackrock
BLK
$180B
| $81.6M | 0.22% |
70,010
+528
| +0.8% | +$590K |
|
107
Lowe's Companies
LOW
$121B
| $79.9M | 0.21% |
317,785
+4,775
| +2% | +$1.17M |
|
108
iShares MSCI EAFE ETF
EFA
$80.2B
| $79.8M | 0.21% |
854,703
+42,220
| +5% | +$3.84M |
|
109
Invesco S&P 500 Equal Weight ETF
RSP
$99.5B
| $77.9M | 0.21% |
410,399
+22,529
| +6% | +$4.2M |
|
110
Starbucks
SBUX
$124B
| $77.3M | 0.21% |
913,850
-180,042
| -16% | -$16.1M |
|
111
Shopify
SHOP
$194B
| $77.3M | 0.21% |
520,187
+19,507
| +4% | +$2.64M |
|
112
Allstate
ALL
$64.7B
| $76.3M | 0.2% |
355,575
-23,135
| -6% | -$4.67M |
|
113
HEICO Corp
HEI
$52.1B
| $74.9M | 0.2% |
232,003
-1,645
| -0.7% | -$524K |
|
114
iShares Core S&P Total US Stock Market ETF
ITOT
$97.8B
| $74.6M | 0.2% |
512,253
+16,340
| +3% | +$2.29M |
|
115
iShares Russell 3000 ETF
IWV
$20.4B
| $74.1M | 0.2% |
195,652
-2,756
| -1% | -$1M |
|
116
Automatic Data Processing
ADP
$107B
| $73.5M | 0.2% |
250,402
-3,704
| -1% | -$1.11M |
|
|
AXON
117
Axon Enterprise
AXON
$48.7B
| $71M | 0.19% |
98,908
+4,391
| +5% | +$3.33M |
|
118
Curtiss-Wright
CW
$26.7B
| $71M | 0.19% |
130,692
-4,679
| -3% | -$2.31M |
|
119
PepsiCo
PEP
$189B
| $70.7M | 0.19% |
503,639
-13,691
| -3% | -$1.96M |
|
120
GE Aerospace
GE
$379B
| $68.6M | 0.18% |
228,086
+34,958
| +18% | +$9.56M |
|
|
SCHW
121
Charles Schwab
SCHW
$189B
| $68.3M | 0.18% |
715,405
-37,294
| -5% | -$3.54M |
|
122
Merck
MRK
$328B
| $68.2M | 0.18% |
812,366
-60,101
| -7% | -$4.95M |
|
123
iShares Core MSCI EAFE ETF
IEFA
$196B
| $67.3M | 0.18% |
770,869
+100,618
| +15% | +$8.55M |
|
124
Deere & Co
DE
$167B
| $66.6M | 0.18% |
145,580
+9,598
| +7% | +$4.73M |
|
125
Thermo Fisher Scientific
TMO
$223B
| $65.1M | 0.17% |
134,124
-1,431
| -1% | -$666K |
|
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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.