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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
+3.1%
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
$34.4B
AUM Growth
+$328M
Cap. Flow
-$18.6M
Cap. Flow %
-0.05%
Top 10 Hldgs %
25.12%
Holding
1,903
New
83
Increased
650
Reduced
792
Closed
87

Top Buys

Rank Stock Value
1
XYZ
Block Inc
XYZ
+$80.6M
2
BLK icon
Blackrock
BLK
+$53.4M
3
CWAN
Clearwater Analytics
CWAN
+$48.5M
4
NVDA icon
NVIDIA
NVDA
+$47.9M
5
BWXT icon
BWX Technologies
BWXT
+$47M

Top Sells

Rank Stock Value
1
DXCM icon
DexCom
DXCM
+$37.7M
2
CSGP icon
CoStar Group
CSGP
+$34.5M
3
VRTX icon
Vertex Pharmaceuticals
VRTX
+$30M
4
BAH icon
Booz Allen Hamilton
BAH
+$29.1M
5
IDXX icon
Idexx Laboratories
IDXX
+$26.6M

Sector Composition

Rank Sector Weight
1 Technology 28.35%
2 Financials 13.43%
3 Healthcare 12.44%
4 Industrials 11.81%
5 Consumer Discretionary 8.44%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MTH icon
1851
Meritage Homes
MTH
$4.75B
– –
-2,384
Closed -$244K
NE icon
1852
Noble Corp
NE
$7.04B
– –
-8,624
Closed -$312K
NFE icon
1853
New Fortress Energy
NFE
$94M
– –
-41,745
Closed -$379K
OLN icon
1854
Olin
OLN
$2.13B
– –
-12,503
Closed -$600K
ONON icon
1855
On Holding
ONON
$10.4B
– –
-14,517
Closed -$728K
PARA
1856
DELISTED
Paramount Global Class B
PARA
– –
-24,535
Closed -$261K
PAWZ icon
1857
ProShares Pet Care ETF
PAWZ
$33.7M
– –
-62
Closed -$3.7K
PCG icon
1858
PG&E
PCG
$38.3B
– –
-14,018
Closed -$277K
PYXS icon
1859
Pyxis Oncology
PYXS
$201M
– –
-10,000
Closed -$36.7K
RRC icon
1860
Range Resources
RRC
$9.39B
– –
-11,200
Closed -$345K
RSI icon
1861
Rush Street Interactive
RSI
$2.81B
– –
-533,712
Closed -$5.79M
RUN icon
1862
Sunrun
RUN
$2.37B
– –
-10,270
Closed -$185K
RVLV icon
1863
Revolve Group
RVLV
$1.69B
– –
-19,553
Closed -$485K
RWM icon
1864
ProShares Short Russell2000
RWM
$99.7M
– –
-30
Closed -$567
RWT
1865
Redwood Trust
RWT
$592M
– –
-13,186
Closed -$102K
SAP icon
1866
SAP
SAP
$236B
– –
-3,160
Closed -$724K
SJB icon
1867
ProShares Short High Yield
SJB
$47.8M
– –
-235
Closed -$3.81K
SLN
1868
Silence Therapeutics
SLN
$641M
– –
-20,000
Closed -$364K
SMFG icon
1869
Sumitomo Mitsui Financial
SMFG
$166B
– –
-26,146
Closed -$330K
SNY icon
1870
Sanofi
SNY
$105B
– –
-3,769
Closed -$217K
STIM icon
1871
Neuronetics
STIM
$223M
– –
-10,252
Closed -$7.79K
STLD icon
1872
Steel Dynamics
STLD
$37.7B
– –
-1,938
Closed -$244K
SWIM icon
1873
Latham Group
SWIM
$921M
– –
-13,456
Closed -$91.5K
TKR icon
1874
Timken Company
TKR
$9.03B
– –
-2,947
Closed -$248K
TPG icon
1875
TPG
TPG
$8.16B
– –
-12,510
Closed -$720K
72 73 74
75
76

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William Blair & Company's Q4 2024 Portfolio in Review

As of Q4 2024, William Blair & Company held 1,903 positions worth $34.4B, up 0.96% from $34.1B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company's Q4 2024 filing shows 83 new, 650 increased, 792 reduced and 87 closed positions. Its largest new stake was Blackrock: 52,623 shares worth $53.9M. The largest sale was DexCom, an estimated $37.7M.

By sector, the portfolio is most concentrated in Technology at 28% of assets, up from 27% a quarter earlier, followed by Financials and Healthcare.

  • William Blair & Company's largest Q4 2024 buy was Blackrock: 52,623 shares worth $53.9M.
  • William Blair & Company added most to Block Inc in Q4 2024, an estimated $80.6M increase.
  • William Blair & Company's biggest Q4 2024 reduction was DexCom, cutting an estimated $37.7M.
  • William Blair & Company fully exited Rush Street Interactive in Q4 2024, selling an estimated $5.79M.
  • William Blair & Company's ten largest holdings make up 25% of its $34.4B portfolio in Q4 2024.
  • William Blair & Company opened 83 new positions and closed 87 in Q4 2024.
  • William Blair & Company's portfolio value rose 0.96% quarter-over-quarter to $34.4B.

Based on William Blair & Company's 13F filing for Q4 2024, filed 12 Feb 2025.