Former Apple CEO John Sculleyâs Zeta Global files for U.S. IPO By Syndicated Content Apr 26, 2021 10:15 AM (Reuters) â Zeta Global Holdings Corp, a marketing software firm co-founded by former Apple Inc Chief Executive Officer John Sculley, has filed paperwork for a U.S. initial public offering, according to a regulatory filing by the company on Monday. The company is the latest among a string of technology firms looking to capitalize on investor appetite for new stock floats in the sector, which has witnessed a boom over the past year as the COVID-19 pandemic prompted businesses to invest more in digital transformation.