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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 | |
|---|---|---|---|---|---|---|
601
Sterling Infrastructure
STRL
$17B
| $3.65M | 0.01% |
10,756
-447
| -4% | -$127K |
|
602
WEX
WEX
$6.67B
| $3.6M | 0.01% |
22,826
-1,600
| -7% | -$265K |
|
603
WisdomTree Japan Hedged Equity Fund
DXJ
$7.55B
| $3.56M | 0.01% |
27,784
+584
| +2% | +$71.7K |
|
604
Crown Castle
CCI
$32.2B
| $3.54M | 0.01% |
36,695
-1,643
| -4% | -$166K |
|
605
T-Mobile US
TMUS
$194B
| $3.53M | 0.01% |
14,748
+3,509
| +31% | +$849K |
|
606
VanEck Morningstar Wide Moat ETF
MOAT
$12.4B
| $3.52M | 0.01% |
35,561
-2,290
| -6% | -$223K |
|
607
Kadant
KAI
$3.89B
| $3.49M | 0.01% |
11,723
+50
| +0.4% | +$16.3K |
|
608
Unifirst Corp
UNF
$5.2B
| $3.45M | 0.01% |
20,650
-992
| -5% | -$172K |
|
609
Primerica
PRI
$9.59B
| $3.41M | 0.01% |
12,296
+432
| +4% | +$116K |
|
610
QuinStreet
QNST
$1.2B
| $3.37M | 0.01% |
218,134
-18,440
| -8% | -$293K |
|
611
Labcorp
LH
$26.1B
| $3.36M | 0.01% |
11,697
+7,675
| +191% | +$2.06M |
|
612
Innovator US Small Cap Power Buffer ETF April
KAPR
$219M
| $3.36M | 0.01% |
98,100
-600
| -0.6% | -$20K |
|
613
Cardinal Health
CAH
$53.9B
| $3.32M | 0.01% |
21,167
+199
| +0.9% | +$30.7K |
|
|
TTAN
614
ServiceTitan Inc
TTAN
$8.56B
| $3.31M | 0.01% |
32,860
+11,125
| +51% | +$1.22M |
|
615
Vanguard Short-Term Inflation-Protected Securities Index Fund
VTIP
$19.8B
| $3.3M | 0.01% |
65,138
+4,079
| +7% | +$205K |
|
616
Sempra
SRE
$56.4B
| $3.28M | 0.01% |
36,493
-360
| -1% | -$29.2K |
|
617
PRA Group
PRAA
$778M
| $3.28M | 0.01% |
212,630
+22,812
| +12% | +$369K |
|
618
International Paper
IP
$21.8B
| $3.28M | 0.01% |
70,672
-346
| -0.5% | -$16.9K |
|
619
Target
TGT
$70.3B
| $3.22M | 0.01% |
35,920
-20,188
| -36% | -$1.99M |
|
620
OneSpaWorld
OSW
$2.73B
| $3.22M | 0.01% |
152,277
+924
| +0.6% | +$20.2K |
|
621
Vanguard Health Care ETF
VHT
$19B
| $3.21M | 0.01% |
12,348
-3,967
| -24% | -$995K |
|
|
JAMF
622
DELISTED
Jamf
JAMF
| $3.19M | 0.01% |
298,270
-55,235
| -16% | -$500K |
|
623
Innovator US Equity Buffer ETF December
BDEC
$223M
| $3.17M | 0.01% |
66,200
-8,280
| -11% | -$384K |
|
624
Canadian National Railway
CNI
$77.3B
| $3.14M | 0.01% |
33,321
-12,425
| -27% | -$1.2M |
|
625
Brink's
BCO
$4.7B
| $3.14M | 0.01% |
26,841
-563
| -2% | -$58.9K |
|
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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.