Overseas investors' flows into the primary market in November hit a 23-month high even as they remained net sellers in the secondary market in this period. Foreign portfolio investors invested ?7,688 crore in the primary market in November till Thursday with the IPO market buzzing with activity, while they offloaded Indian shares worth ?6,877 crore. The primary market includes IPOs, follow-on public offers, bonus issues, rights issues, and offer for sale.