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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
-1.82%
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
$33.2B
AUM Growth
-$1.22B
Cap. Flow
+$11.1M
Cap. Flow %
0.03%
Top 10 Hldgs %
23.77%
Holding
1,895
New
82
Increased
626
Reduced
808
Closed
94

Top Buys

Rank Stock Value
1
META icon
Meta Platforms (Facebook)
META
+$112M
2
AAON icon
Aaon
AAON
+$104M
3
GEV icon
GE Vernova
GEV
+$77.6M
4
QCOM icon
Qualcomm
QCOM
+$47M
5
WM icon
Waste Management
WM
+$44.3M

Top Sells

Rank Stock Value
1
INTU icon
Intuit
INTU
+$65.9M
2
POOL icon
Pool Corp
POOL
+$64.7M
3
DHR icon
Danaher
DHR
+$59.8M
4
ZTS icon
Zoetis
ZTS
+$57.9M
5
SCHW
Charles Schwab
SCHW
+$44.5M

Sector Composition

Rank Sector Weight
1 Technology 26.23%
2 Financials 14.3%
3 Healthcare 12.58%
4 Industrials 12.51%
5 Consumer Discretionary 7.94%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ABBV icon
26
AbbVie
ABBV
$442B
$260M 0.79%
1,243,105
+41,998
+3% +$8.16M
NOW icon
27
ServiceNow
NOW
$132B
$260M 0.78%
1,630,555
+89,140
+6% +$17.2M
WDAY icon
28
Workday
WDAY
$51B
$259M 0.78%
1,110,590
-12,516
-1% -$3.19M
FAST icon
29
Fastenal
FAST
$58.9B
$255M 0.77%
6,585,268
+71,734
+1% +$2.69M
TYL icon
30
Tyler Technologies
TYL
$13.5B
$245M 0.74%
420,874
-12,947
-3% -$7.69M
TDG icon
31
TransDigm Group
TDG
$68.6B
$242M 0.73%
175,221
-3,122
-2% -$4.16M
ISRG icon
32
Intuitive Surgical
ISRG
$141B
$234M 0.71%
473,416
+4,536
+1% +$2.51M
IVV icon
33
iShares Core S&P 500 ETF
IVV
$910B
$234M 0.71%
417,229
+6,487
+2% +$3.83M
ADBE icon
34
Adobe
ADBE
$108B
$232M 0.7%
603,925
-17,379
-3% -$7.45M
CSGP icon
35
CoStar Group
CSGP
$13.3B
$230M 0.69%
2,903,518
-490,433
-14% -$37.3M
ACN icon
36
Accenture
ACN
$110B
$225M 0.68%
721,493
-10,382
-1% -$3.67M
BRK.B icon
37
Berkshire Hathaway Class B
BRK.B
$1.08T
$224M 0.68%
420,754
+1,635
+0.4% +$795K
AON icon
38
Aon
AON
$75.9B
$221M 0.67%
554,750
-9,497
-2% -$3.64M
GWRE icon
39
Guidewire Software
GWRE
$15.2B
$221M 0.67%
1,179,878
-33,637
-3% -$6.54M
WMT icon
40
Walmart Inc
WMT
$919B
$215M 0.65%
2,444,485
-62,128
-2% -$5.83M
ABT icon
41
Abbott
ABT
$192B
$209M 0.63%
1,579,024
+6,940
+0.4% +$883K
ECL icon
42
Ecolab
ECL
$77.4B
$206M 0.62%
814,133
-29,901
-4% -$7.54M
RYAN icon
43
Ryan Specialty Holdings
RYAN
$10.9B
$206M 0.62%
2,784,916
+18,953
+0.7% +$1.29M
CTAS icon
44
Cintas
CTAS
$80.6B
$205M 0.62%
998,603
-13,795
-1% -$2.75M
PANW icon
45
Palo Alto Networks
PANW
$321B
$201M 0.61%
1,178,648
-125,379
-10% -$23.2M
APH icon
46
Amphenol
APH
$205B
$199M 0.6%
3,027,350
-42,844
-1% -$2.92M
BX icon
47
Blackstone
BX
$112B
$188M 0.57%
1,345,919
-6,516
-0.5% -$1.06M
AXP icon
48
American Express
AXP
$233B
$186M 0.56%
689,548
-30,689
-4% -$9.07M
CRM icon
49
Salesforce
CRM
$164B
$183M 0.55%
680,179
-33,455
-5% -$10.4M
UNH icon
50
UnitedHealth
UNH
$359B
$177M 0.53%
338,077
-31,832
-9% -$16.3M
1
2
3 4 5

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William Blair & Company's Q1 2025 Portfolio in Review

As of Q1 2025, William Blair & Company held 1,895 positions worth $33.2B, down 3.6% from $34.4B the previous quarter. Its ten largest holdings account for 24% of the portfolio.

William Blair & Company's Q1 2025 filing shows 82 new, 626 increased, 808 reduced and 94 closed positions. Its largest new stake was CCC Intelligent Solutions: 320,989 shares worth $2.9M. The largest sale was Intuit, an estimated $65.9M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, down from 28% a quarter earlier, followed by Financials and Healthcare.

  • William Blair & Company's largest Q1 2025 buy was CCC Intelligent Solutions: 320,989 shares worth $2.9M.
  • William Blair & Company added most to Meta Platforms (Facebook) in Q1 2025, an estimated $112M increase.
  • William Blair & Company's biggest Q1 2025 reduction was Intuit, cutting an estimated $65.9M.
  • William Blair & Company fully exited Smartsheet Inc. in Q1 2025, selling an estimated $3.52M.
  • William Blair & Company's ten largest holdings make up 24% of its $33.2B portfolio in Q1 2025.
  • William Blair & Company opened 82 new positions and closed 94 in Q1 2025.
  • William Blair & Company's portfolio value fell 3.6% quarter-over-quarter to $33.2B.

Based on William Blair & Company's 13F filing for Q1 2025, filed 9 May 2025.