What is the base and shelf issue size in NCD?

The base issue size is the minimum issue size of an NCD. According to SEBI regulations, the debt securities must have a minimum base size of Rs 100 crore.

However, shelf issue size is the maximum size of the NCD issue. Whenever an NCD gets oversubscribed by investors, the issuer company can retain oversubscription upto the shelf size of the NCD.