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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
SPG icon
626
Simon Property Group
SPG
$71.6B
$3.13M 0.01%
16,704
+183
+1% +$31.6K
AIRG icon
627
Airgain
AIRG
$69.7M
$3.11M 0.01%
716,407
-32,637
-4% -$144K
FITB
628
Fifth Third Bancorp
FITB
$52.7B
$3.1M 0.01%
69,669
-5,747
-8% -$252K
MGV icon
629
Vanguard Morningstar Mega Cap Value ETF
MGV
$13.7B
$3.07M 0.01%
22,280
+729
+3% +$97.5K
ROST icon
630
Ross Stores
ROST
$78.2B
$3.07M 0.01%
20,114
+66
+0.3% +$9.42K
PFXF icon
631
VanEck Preferred Securities ex Financials ETF
PFXF
$2.49B
$3.05M 0.01%
171,788
+169,788
+8,489% +$3M
XEL icon
632
Xcel Energy
XEL
$49.4B
$3.05M 0.01%
37,820
-363
-1% -$26.3K
USD icon
633
ProShares Ultra Semiconductors
USD
$3.06B
$3M 0.01%
60,502
-50
-0.1% -$2.16K
VICI icon
634
VICI Properties
VICI
$28.9B
$2.94M 0.01%
90,261
-55,264
-38% -$1.82M
ED icon
635
Consolidated Edison
ED
$40B
$2.94M 0.01%
29,233
+1,410
+5% +$141K
IWS icon
636
iShares Russell Mid-Cap Value ETF
IWS
$16B
$2.94M 0.01%
21,026
-3,373
-14% -$461K
VDC icon
637
Vanguard Consumer Staples ETF
VDC
$8.01B
$2.93M 0.01%
13,718
+3
+0% +$657
BXSL icon
638
Blackstone Secured Lending
BXSL
$5.79B
$2.93M 0.01%
112,273
+7,226
+7% +$217K
A icon
639
Agilent Technologies
A
$41.9B
$2.92M 0.01%
22,743
-13,792
-38% -$1.67M
PRU icon
640
Prudential Financial
PRU
$42.7B
$2.91M 0.01%
28,092
-462
-2% -$48.6K
AEM icon
641
Agnico Eagle Mines
AEM
$90.9B
$2.91M 0.01%
17,251
+1,634
+10% +$224K
PDP icon
642
Invesco Dorsey Wright Momentum ETF
PDP
$1.54B
$2.9M 0.01%
24,565
-355
-1% -$39.9K
SPDW icon
643
State Street SPDR Portfolio Developed World ex-US ETF
SPDW
$42.1B
$2.9M 0.01%
67,708
+8,935
+15% +$370K
DLB icon
644
Dolby
DLB
$5.74B
$2.9M 0.01%
40,030
-5,256
-12% -$386K
IJK icon
645
iShares S&P Mid-Cap 400 Growth ETF
IJK
$11.3B
$2.87M 0.01%
29,934
+69
+0.2% +$6.5K
CFLT
646
DELISTED
Confluent
CFLT
$2.85M 0.01%
144,126
-16,449
-10% -$344K
SJM icon
647
J.M. Smucker
SJM
$12.8B
$2.85M 0.01%
26,232
-8,432
-24% -$916K
DSI icon
648
iShares MSCI KLD 400 Social ETF
DSI
$5.57B
$2.84M 0.01%
22,582
-107
-0.5% -$12.9K
SCHR
649
Schwab Intermediately-Term US Treasury ETF
SCHR
$13.4B
$2.78M 0.01%
110,642
+17,760
+19% +$444K
ACWI icon
650
iShares MSCI ACWI ETF
ACWI
$33.6B
$2.78M 0.01%
20,085
+12,979
+183% +$1.72M
24 25
26
27 28

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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.