The correct sentence is:

Further, to augment bond market liquidity, corporates need to be encouraged to reissue existing bonds under the same International Securities Identification Number, to duly shore up floating stock.

Explanation:

• Reissue: This means issuing bonds again that were previously issued — which fits perfectly with the idea of using the same ISIN (International Securities Identification Number).

• Stock: In finance, floating stock refers to the number of shares or bonds available for trading. So "shore up floating stock" means increasing the amount of tradable bonds, which improves market liquidity.

✅ Final sentence: Further, to augment bond market liquidity, corporates need to be encouraged to reissue existing bonds under the same International Securities Identification Number, to duly shore up floating stock.