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William Blair & Company

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
Cap. Flow
-$160M
Cap. Flow %
-0.43%
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75

Top Buys

Rank Stock Value
1
META icon
Meta Platforms (Facebook)
META
+$76.1M
2
APP icon
Applovin
APP
+$75.3M
3
NOW icon
ServiceNow
NOW
+$66.6M
4
CWAN
Clearwater Analytics
CWAN
+$65.8M
5
FANG icon
Diamondback Energy
FANG
+$30.7M

Top Sells

Rank Stock Value
1
CYBR
CyberArk
CYBR
+$70.7M
2
ADBE icon
Adobe
ADBE
+$61.7M
3
MSFT icon
Microsoft
MSFT
+$45.7M
4
WDAY icon
Workday
WDAY
+$42.6M
5
POOL icon
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
AMGN icon
151
Amgen
AMGN
$225B
$45.8M 0.12%
162,239
-4,654
-3% -$1.35M
UNH icon
152
UnitedHealth
UNH
$364B
$45.6M 0.12%
132,138
-110,802
-46% -$33.5M
PM icon
153
Philip Morris
PM
$290B
$45M 0.12%
277,560
+92,856
+50% +$15.6M
PODD icon
154
Insulet
PODD
$10.1B
$44.3M 0.12%
143,373
-20,182
-12% -$6.32M
NET icon
155
Cloudflare
NET
$111B
$43.4M 0.12%
202,134
+905
+0.4% +$185K
IJH icon
156
iShares Core S&P Mid-Cap ETF
IJH
$128B
$42.5M 0.11%
650,995
-28,171
-4% -$1.81M
GILD icon
157
Gilead Sciences
GILD
$168B
$41.9M 0.11%
377,364
-8,983
-2% -$1.02M
GNRC icon
158
Generac Holdings
GNRC
$13.1B
$40.5M 0.11%
242,150
+16,182
+7% +$2.84M
CME icon
159
CME Group
CME
$94.3B
$39.6M 0.11%
146,632
+3,227
+2% +$878K
RDVY icon
160
First Trust Rising Dividend Achievers ETF
RDVY
$25.7B
$38.9M 0.1%
578,324
+210,781
+57% +$13.7M
SPMD icon
161
State Street SPDR Portfolio S&P 400 Mid Cap ETF
SPMD
$19B
$38.7M 0.1%
676,940
-4,971
-0.7% -$280K
MRVL icon
162
Marvell Technology
MRVL
$195B
$38.5M 0.1%
457,609
-147,970
-24% -$10.9M
TXN icon
163
Texas Instruments
TXN
$253B
$37.6M 0.1%
204,664
+1,174
+0.6% +$230K
VO icon
164
Vanguard Morningstar Mid-Cap ETF
VO
$110B
$36.8M 0.1%
500,816
+2,084
+0.4% +$150K
PFE icon
165
Pfizer
PFE
$150B
$36.2M 0.1%
1,421,013
-437,039
-24% -$10.8M
AJG icon
166
Arthur J. Gallagher & Co
AJG
$65.5B
$35.2M 0.09%
113,753
-3,216
-3% -$970K
BJ icon
167
BJs Wholesale Club
BJ
$11.8B
$34.5M 0.09%
370,048
-9,668
-3% -$988K
EPD icon
168
Enterprise Products Partners
EPD
$81.9B
$34.3M 0.09%
1,095,749
-9,723
-0.9% -$307K
AMD icon
169
Advanced Micro Devices
AMD
$788B
$33.8M 0.09%
208,862
-24,808
-11% -$4M
KLAC icon
170
KLA
KLAC
$272B
$33.7M 0.09%
312,700
-2,690
-0.9% -$251K
IJR icon
171
iShares Core S&P Small-Cap ETF
IJR
$112B
$33.1M 0.09%
278,501
-6,610
-2% -$760K
SCHD icon
172
Schwab US Dividend Equity ETF
SCHD
$107B
$33M 0.09%
1,208,861
-274,500
-19% -$7.49M
VWO icon
173
Vanguard FTSE Emerging Markets ETF
VWO
$126B
$32.7M 0.09%
603,826
+9,021
+2% +$465K
DSGX icon
174
Descartes Systems
DSGX
$6.65B
$32.6M 0.09%
345,601
-6,814
-2% -$697K
IRM icon
175
Iron Mountain
IRM
$37B
$32.5M 0.09%
318,410
+4,280
+1% +$412K
5 6
7
8 9

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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.