Joiners No Joiners Today. Leavers No Leavers Today. What’s cooking in the IPO kitchen? Public Policy Holding Company, to join AIM. PPHC, through its wholly-owned companies, operates a portfolio of independent firms that offer public affairs, crisis management, lobbying and advocacy services on behalf of corporate, trade association and non-profit client organisations. Mkt Cap and Capital to be raised TBC. Expected admission date Mid Dec. Libertine to join AIM. Libertine has developed a technolog ....