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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 | |
|---|---|---|---|---|---|---|
251
Equinix
EQIX
$105B
| $17.4M | 0.05% |
22,228
-968
| -4% | -$756K |
|
252
Mondelez International
MDLZ
$79.4B
| $17.4M | 0.05% |
278,356
-8,064
| -3% | -$520K |
|
253
Applied Materials
AMAT
$435B
| $17.3M | 0.05% |
84,265
+156
| +0.2% | +$28.3K |
|
|
CYBR
254
DELISTED
CyberArk
CYBR
| $17.2M | 0.05% |
35,521
-164,657
| -82% | -$70.7M |
|
255
iShares S&P 500 Growth ETF
IVW
$77.3B
| $17.2M | 0.05% |
142,120
+951
| +0.7% | +$109K |
|
256
Sysco
SYY
$40.5B
| $17.1M | 0.05% |
207,905
+10,910
| +6% | +$872K |
|
257
Citigroup
C
$231B
| $17.1M | 0.05% |
168,649
+3,058
| +2% | +$290K |
|
258
Royal Caribbean
RCL
$82.4B
| $17.1M | 0.05% |
52,854
-4,130
| -7% | -$1.38M |
|
259
West Pharmaceutical
WST
$24.8B
| $16.8M | 0.04% |
63,999
-7,737
| -11% | -$1.88M |
|
260
Kinsale Capital Group
KNSL
$8.51B
| $16.7M | 0.04% |
39,363
+449
| +1% | +$204K |
|
261
SoFi Technologies
SOFI
$23.2B
| $16.5M | 0.04% |
623,786
+288,088
| +86% | +$6.84M |
|
262
Quanta Services
PWR
$102B
| $16.3M | 0.04% |
39,345
+2,210
| +6% | +$859K |
|
263
Tradeweb Markets
TW
$21.9B
| $16.3M | 0.04% |
146,902
+10,365
| +8% | +$1.33M |
|
264
Vanguard Extended Market ETF
VXF
$32.1B
| $16.2M | 0.04% |
77,381
+4,846
| +7% | +$980K |
|
265
AstraZeneca
AZN
$246B
| $16.1M | 0.04% |
105,052
-154
| -0.1% | -$23.3K |
|
266
Modine Manufacturing
MOD
$10.6B
| $16.1M | 0.04% |
113,116
+32,482
| +40% | +$4.13M |
|
267
Paylocity
PCTY
$7.73B
| $16M | 0.04% |
100,379
-1,587
| -2% | -$281K |
|
268
State Street Health Care Select Sector SPDR ETF
XLV
$44B
| $15.9M | 0.04% |
114,122
-6,671
| -6% | -$903K |
|
269
Alibaba
BABA
$300B
| $15.8M | 0.04% |
88,455
-1,532
| -2% | -$201K |
|
270
Innovator US Equity Power Buffer ETF January
PJAN
$1.43B
| $15.7M | 0.04% |
343,136
-8,749
| -2% | -$393K |
|
271
Fortinet
FTNT
$118B
| $15.7M | 0.04% |
186,845
-15,618
| -8% | -$1.39M |
|
272
Valmont Industries
VMI
$9.52B
| $15.5M | 0.04% |
39,860
-5,321
| -12% | -$1.94M |
|
273
Ares Management
ARES
$32.1B
| $15.4M | 0.04% |
96,523
+729
| +0.8% | +$131K |
|
274
BILL Holdings
BILL
$4.85B
| $15.2M | 0.04% |
286,640
-7,933
| -3% | -$368K |
|
275
Vanguard Morningstar Small-Cap ETF
VB
$83B
| $15.2M | 0.04% |
59,600
+791
| +1% | +$196K |
|
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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.