ServiceNow Inc., the maker of cloud-based software that helps companies manage information-technology systems, will begin meeting with investors this week to promote its initial public offering, a person with knowledge of the situation said. The San Diego-based company plans to complete the offering by the end of the month, said the person, who declined to be named because the information is private. ServiceNow announced plans in March for an IPO to raise about $150 million. While the company hasn't yet indicated the number of shares or price range, the so-called roadshow typically lasts about two weeks and follows a regulatory filing setting the terms.