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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
IEI icon
1051
iShares 3-7 Year Treasury Bond ETF
IEI
$17.7B
$618K ﹤0.01%
5,171
+65
+1% +$7.73K
FXO icon
1052
First Trust Financials AlphaDEX Fund
FXO
$1.15B
$617K ﹤0.01%
10,391
+296
+3% +$17.2K
KEY icon
1053
KeyCorp
KEY
$24.6B
$614K ﹤0.01%
32,851
-275
-0.8% -$5.09K
UYG icon
1054
ProShares Ultra Financials
UYG
$863M
$609K ﹤0.01%
6,140
– –
FDS icon
1055
Factset
FDS
$10.2B
$609K ﹤0.01%
2,124
-191
-8% -$73K
MGC icon
1056
Vanguard Morningstar Mega Cap ETF
MGC
$10.4B
$605K ﹤0.01%
2,480
– –
JMST icon
1057
JPMorgan Ultra-Short Municipal Income ETF
JMST
$7.15B
$605K ﹤0.01%
11,850
+1,708
+17% +$87.1K
GBDC icon
1058
Golub Capital BDC
GBDC
$3.48B
$600K ﹤0.01%
43,826
– –
IYJ icon
1059
iShares US Industrials ETF
IYJ
$1.96B
$600K ﹤0.01%
4,111
+14
+0.3% +$2.03K
ISTB icon
1060
iShares Core 1-5 Year USD Bond ETF
ISTB
$5.14B
$599K ﹤0.01%
12,273
-412
-3% -$20K
RL icon
1061
Ralph Lauren
RL
$23.1B
$598K ﹤0.01%
1,907
+12
+0.6% +$3.58K
CCL icon
1062
Carnival Corporation Ltd
CCL
$38.9B
$595K ﹤0.01%
20,566
-821
-4% -$24.8K
SNDK
1063
Sandisk
SNDK
$223B
$591K ﹤0.01%
5,270
-1,114
-17% -$65K
IBRX icon
1064
ImmunityBio
IBRX
$8.11B
$591K ﹤0.01%
240,214
+400
+0.2% +$1.03K
CRK icon
1065
Comstock Resources
CRK
$3.99B
$585K ﹤0.01%
+29,497
New +$546K
IEX icon
1066
IDEX
IEX
$17.6B
$583K ﹤0.01%
3,584
-113
-3% -$19.1K
PHR icon
1067
Phreesia
PHR
$780M
$583K ﹤0.01%
24,788
-96,520
-80% -$2.63M
ZROZ icon
1068
PIMCO 25+ Year Zero Coupon US Treasury Index Exchange-Traded Fund
ZROZ
$1.31B
$578K ﹤0.01%
8,503
-2,024
-19% -$133K
VIOO icon
1069
Vanguard S&P Small-Cap 600 ETF
VIOO
$4.35B
$577K ﹤0.01%
5,221
+1,790
+52% +$191K
IYC icon
1070
iShares US Consumer Discretionary ETF
IYC
$1.22B
$575K ﹤0.01%
5,485
+52
+1% +$5.33K
EPP icon
1071
iShares MSCI Pacific ex Japan ETF
EPP
$2.24B
$572K ﹤0.01%
11,091
+56
+0.5% +$2.84K
SMCI icon
1072
Super Micro Computer
SMCI
$25.3B
$569K ﹤0.01%
11,872
-1,284
-10% -$61.3K
TSN icon
1073
Tyson Foods
TSN
$19.8B
$567K ﹤0.01%
10,446
+5,929
+131% +$327K
KWEB icon
1074
KraneShares CSI China Internet ETF
KWEB
$5.31B
$566K ﹤0.01%
13,480
-128
-0.9% -$4.8K
IYH icon
1075
iShares US Healthcare ETF
IYH
$3.77B
$566K ﹤0.01%
9,636
-500
-5% -$28.5K
41 42
43
44 45

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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.