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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
SUSB icon
901
iShares ESG Aware 1-5 Year USD Corporate Bond ETF
SUSB
$1.3B
$1.08M ﹤0.01%
42,476
+313
+0.7% +$7.88K
EXPD icon
902
Expeditors International
EXPD
$24.3B
$1.07M ﹤0.01%
8,693
-137
-2% -$16.3K
TLT icon
903
iShares 20+ Year Treasury Bond ETF
TLT
$40.8B
$1.05M ﹤0.01%
11,801
+733
+7% +$64.1K
APG icon
904
APi Group
APG
$18.8B
$1.05M ﹤0.01%
30,551
+29
+0.1% +$1.01K
HYD icon
905
VanEck High Yield Muni ETF
HYD
$4.42B
$1.05M ﹤0.01%
20,623
+623
+3% +$31K
ALC icon
906
Alcon
ALC
$35.5B
$1.05M ﹤0.01%
14,027
+11,344
+423% +$947K
STEP icon
907
StepStone Group
STEP
$4.28B
$1.04M ﹤0.01%
15,972
– –
BMO icon
908
Bank of Montreal
BMO
$129B
$1.04M ﹤0.01%
7,986
-1,489
-16% -$176K
OXY icon
909
Occidental Petroleum
OXY
$57.7B
$1.04M ﹤0.01%
21,972
-42
-0.2% -$1.9K
IEF icon
910
iShares 7-10 Year Treasury Bond ETF
IEF
$47.3B
$1.03M ﹤0.01%
10,635
+90
+0.9% +$8.61K
CPB icon
911
Campbell Soup
CPB
$6.94B
$1.02M ﹤0.01%
32,413
+7,284
+29% +$235K
RMAX icon
912
RE/MAX Holdings
RMAX
$265M
$1.02M ﹤0.01%
107,876
-500
-0.5% -$4.41K
AVY icon
913
Avery Dennison
AVY
$13.6B
$1.02M ﹤0.01%
6,264
-765
-11% -$132K
LSCC icon
914
Lattice Semiconductor
LSCC
$18.2B
$1.01M ﹤0.01%
13,837
-570
-4% -$34.7K
BSY icon
915
Bentley Systems
BSY
$11B
$1.01M ﹤0.01%
19,610
+365
+2% +$20K
JBTM
916
JBT Marel
JBTM
$6.1B
$1.01M ﹤0.01%
7,178
+2,084
+41% +$285K
MMSI icon
917
Merit Medical Systems
MMSI
$5.4B
$1.01M ﹤0.01%
12,099
-100
-0.8% -$8.71K
CALF icon
918
Pacer US Small Cap Cash Cows 100 ETF
CALF
$3.9B
$1M ﹤0.01%
22,896
-15,346
-40% -$647K
NI icon
919
NiSource
NI
$20.2B
$1M ﹤0.01%
23,100
-202
-0.9% -$8.36K
WWD icon
920
Woodward
WWD
$21.2B
$999K ﹤0.01%
3,955
+737
+23% +$183K
SSO icon
921
ProShares Ultra S&P500
SSO
$8.51B
$995K ﹤0.01%
17,756
+742
+4% +$38.7K
FALN icon
922
iShares Fallen Angels USD Bond ETF
FALN
$1.61B
$994K ﹤0.01%
35,778
+35,742
+99,283% +$974K
RIG icon
923
Transocean
RIG
$6.39B
$993K ﹤0.01%
318,298
+22,460
+8% +$67.8K
RACE icon
924
Ferrari
RACE
$72.5B
$986K ﹤0.01%
2,032
-338
-14% -$162K
PSLV icon
925
Sprott Physical Silver Trust
PSLV
$13.3B
$983K ﹤0.01%
62,602
+4,436
+8% +$59.3K
35 36
37
38 39

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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.