I have highlighted the words <b>of</b> and <b>from</b> in bold.<br/><br/>"It is optimistic that the recent price changes will benefit new and existing customers<b> of</b> CompanyXYZ"<br/><br/>"It is optimistic that new and existing customers <b>from</b> CompanyXYZ will benefit from the recent price changes."<br/><br/>Then I decided to write it like this, which sounds somewhat better.<br/><br/>"It is optimistic that CompanyXYZ's new and existing customers will benefit from the recent price changes."