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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
+14.12%
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
$29.3B
AUM Growth
+$3.27B
Cap. Flow
-$91M
Cap. Flow %
-0.31%
Top 10 Hldgs %
24.41%
Holding
1,872
New
83
Increased
624
Reduced
816
Closed
87

Top Buys

Rank Stock Value
1
GWRE icon
Guidewire Software
GWRE
+$37.5M
2
SCHW
Charles Schwab
SCHW
+$37.1M
3
VLTO icon
Veralto
VLTO
+$17.1M
4
VRTX icon
Vertex Pharmaceuticals
VRTX
+$16.7M
5
CSGP icon
CoStar Group
CSGP
+$16.3M

Top Sells

Rank Stock Value
1
DHR icon
Danaher
DHR
+$37.6M
2
IRTC icon
iRhythm Holdings
IRTC
+$26.7M
3
DE icon
Deere & Co
DE
+$22.6M
4
TOST icon
Toast
TOST
+$21.2M
5
KO icon
Coca-Cola
KO
+$20.3M

Sector Composition

Rank Sector Weight
1 Technology 26.35%
2 Healthcare 17.08%
3 Financials 12.09%
4 Industrials 11.7%
5 Consumer Discretionary 8.53%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
OLED icon
1076
Universal Display
OLED
$4.18B
$489K ﹤0.01%
2,558
+28
+1% +$4.63K
TWKS
1077
DELISTED
Thoughtworks Holding, Inc. Common Stock
TWKS
$487K ﹤0.01%
101,263
-26,205
-21% -$108K
GNR icon
1078
State Street SPDR S&P Global Natural Resources ETF
GNR
$4.9B
$483K ﹤0.01%
8,530
-2,439
-22% -$134K
AVTR icon
1079
Avantor
AVTR
$9.37B
$479K ﹤0.01%
20,987
-8,869
-30% -$182K
MRTN icon
1080
Marten Transport
MRTN
$1.24B
$478K ﹤0.01%
22,800
– –
FXO icon
1081
First Trust Financials AlphaDEX Fund
FXO
$1.15B
$472K ﹤0.01%
10,895
– –
W icon
1082
Wayfair
W
$13.9B
$472K ﹤0.01%
7,642
-3,334
-30% -$174K
LIT icon
1083
Global X Lithium & Battery Tech ETF
LIT
$1.6B
$471K ﹤0.01%
9,256
-13,232
-59% -$656K
VIRT icon
1084
Virtu Financial
VIRT
$5.05B
$471K ﹤0.01%
23,239
– –
HIG icon
1085
Hartford Financial Services
HIG
$37.8B
$470K ﹤0.01%
5,842
-72
-1% -$5.42K
BALL icon
1086
Ball Corp
BALL
$16.4B
$469K ﹤0.01%
8,162
+154
+2% +$7.94K
INSM icon
1087
Insmed
INSM
$27.6B
$467K ﹤0.01%
15,084
– –
SSO icon
1088
ProShares Ultra S&P500
SSO
$8.51B
$466K ﹤0.01%
14,320
+372
+3% +$10.7K
NSSC icon
1089
Napco Security Technologies
NSSC
$1.37B
$462K ﹤0.01%
13,486
+56
+0.4% +$1.49K
VCYT icon
1090
Veracyte
VCYT
$3.42B
$459K ﹤0.01%
16,683
-23,873
-59% -$576K
XIFR
1091
XPLR Infrastructure LP
XIFR
$1.09B
$457K ﹤0.01%
15,012
-5,218
-26% -$133K
VTGN icon
1092
VistaGen Therapeutics
VTGN
$11.8M
$453K ﹤0.01%
88,046
+2,873
+3% +$10.9K
THW
1093
abrdn World Healthcare Fund
THW
$560M
$451K ﹤0.01%
38,681
– –
PAAS icon
1094
Pan American Silver
PAAS
$19.9B
$450K ﹤0.01%
27,534
-267
-1% -$4K
FCBC icon
1095
First Community Bankshares
FCBC
$933M
$449K ﹤0.01%
12,108
– –
HBNC icon
1096
Horizon Bancorp
HBNC
$1.05B
$446K ﹤0.01%
31,200
-800
-3% -$9.02K
SLAB icon
1097
Silicon Laboratories
SLAB
$7.28B
$446K ﹤0.01%
3,370
-25
-0.7% -$2.73K
BCSF icon
1098
Bain Capital Specialty
BCSF
$821M
$446K ﹤0.01%
29,570
– –
MUFG icon
1099
Mitsubishi UFJ Financial
MUFG
$260B
$445K ﹤0.01%
51,724
-215
-0.4% -$1.81K
SLN
1100
Silence Therapeutics
SLN
$660M
$444K ﹤0.01%
25,548
-13,438
-34% -$151K
42 43
44
45 46

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William Blair & Company's Q4 2023 Portfolio in Review

As of Q4 2023, William Blair & Company held 1,872 positions worth $29.3B, up 13% from $26.1B the previous quarter. Its ten largest holdings account for 24% of the portfolio.

William Blair & Company's Q4 2023 filing shows 83 new, 624 increased, 816 reduced and 87 closed positions. Its largest new stake was Veralto: 229,539 shares worth $18.9M. The largest sale was Danaher, an estimated $37.6M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, up from 25% a quarter earlier, followed by Healthcare and Financials.

  • William Blair & Company's largest Q4 2023 buy was Veralto: 229,539 shares worth $18.9M.
  • William Blair & Company added most to Guidewire Software in Q4 2023, an estimated $37.5M increase.
  • William Blair & Company's biggest Q4 2023 reduction was Danaher, cutting an estimated $37.6M.
  • William Blair & Company fully exited Seagen Inc. Common Stock in Q4 2023, selling an estimated $13.8M.
  • William Blair & Company's ten largest holdings make up 24% of its $29.3B portfolio in Q4 2023.
  • William Blair & Company opened 83 new positions and closed 87 in Q4 2023.
  • William Blair & Company's portfolio value rose 13% quarter-over-quarter to $29.3B.

Based on William Blair & Company's 13F filing for Q4 2023, filed 12 Feb 2024.