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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 | |
|---|---|---|---|---|---|---|
876
The Mosaic Company
MOS
$6.92B
| $1.18M | ﹤0.01% |
34,162
-4,293
| -11% | -$148K |
|
877
Alliant Energy
LNT
$18.2B
| $1.18M | ﹤0.01% |
17,538
+193
| +1% | +$12.5K |
|
878
Schwab US Mid-Cap ETF
SCHM
$15.3B
| $1.17M | ﹤0.01% |
39,466
+504
| +1% | +$14.7K |
|
879
State Street Materials Select Sector SPDR ETF
XLB
$8.57B
| $1.17M | ﹤0.01% |
26,082
+92
| +0.4% | +$4.16K |
|
880
iShares Select U.S. REIT ETF
ICF
$2.11B
| $1.15M | ﹤0.01% |
18,645
| – | – |
|
881
Fidelity MSCI Information Technology Index ETF
FTEC
$21.6B
| $1.15M | ﹤0.01% |
5,166
-180
| -3% | -$37.4K |
|
882
Humana
HUM
$46.2B
| $1.14M | ﹤0.01% |
4,380
-114
| -3% | -$30K |
|
883
Hasbro
HAS
$13.6B
| $1.14M | ﹤0.01% |
15,014
+582
| +4% | +$45.1K |
|
|
BELFB
884
Bel Fuse Inc Class B
BELFB
$4.13B
| $1.13M | ﹤0.01% |
8,025
-1,125
| -12% | -$143K |
|
885
PPG Industries
PPG
$25.5B
| $1.13M | ﹤0.01% |
10,757
+1,853
| +21% | +$206K |
|
886
Monster Beverage
MNST
$91.4B
| $1.13M | ﹤0.01% |
33,488
+980
| +3% | +$30.6K |
|
887
Oshkosh
OSK
$9.41B
| $1.12M | ﹤0.01% |
8,665
+691
| +9% | +$91.7K |
|
888
SPS Commerce
SPSC
$2.86B
| $1.12M | ﹤0.01% |
10,765
+2,492
| +30% | +$297K |
|
889
VanEck Pharmaceutical ETF
PPH
$991M
| $1.11M | ﹤0.01% |
12,314
+19
| +0.2% | +$1.66K |
|
890
CDW
CDW
$17.8B
| $1.11M | ﹤0.01% |
6,969
-4,364
| -39% | -$742K |
|
891
Jefferies Financial Group
JEF
$12.9B
| $1.11M | ﹤0.01% |
16,960
| – | – |
|
892
Pan American Silver
PAAS
$19.9B
| $1.1M | ﹤0.01% |
28,360
+8,742
| +45% | +$281K |
|
893
Mettler-Toledo International
MTD
$28.7B
| $1.1M | ﹤0.01% |
894
-3
| -0.3% | -$3.76K |
|
894
Vanguard Short-Term Treasury ETF
VGSH
$30.2B
| $1.1M | ﹤0.01% |
18,622
-1,580
| -8% | -$92.7K |
|
895
W.P. Carey
WPC
$16.3B
| $1.09M | ﹤0.01% |
16,201
-3,551
| -18% | -$232K |
|
896
MeiraGTx Holdings
MGTX
$1.17B
| $1.09M | ﹤0.01% |
132,533
| – | – |
|
897
UFP Industries
UFPI
$5.03B
| $1.09M | ﹤0.01% |
11,625
+65
| +0.6% | +$6.56K |
|
|
FFIC
898
DELISTED
Flushing Financial
FFIC
| $1.08M | ﹤0.01% |
78,533
-1,637
| -2% | -$21.3K |
|
899
iShares MSCI USA Value Factor ETF
VLUE
$9.72B
| $1.08M | ﹤0.01% |
8,662
-1,535
| -15% | -$181K |
|
900
Warner Bros
WBD
$69.6B
| $1.08M | ﹤0.01% |
55,427
-1,509
| -3% | -$20.6K |
|
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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.