The last full week of this month was a busy one with more than A$5 billion of bonds issued in the domestic corporate bond market - with the result that May has proved to be the best month of the year so far, with issuance totalling $11.9 billion.DBS Bank Limited, otherwise known as The Development Bank of Singapore, made its debut in the domestic corporate bond market with a $750 million covered bond issue. The size of the issue makes it one of the largest debut issues the market has seen.The bank is highly rated, at AA-, and the AAA-rated rating of the covered bond issue would have contributed to investor demand, along with the modest issuance volumes seen in the market so far this year. The three-year floating rate notes were priced at 77 basis points over the 90-day bank bill rate. The pricing compares well with the 110 bps paid by Canadian Imperial Bank of Commerce when it issued five year covered bonds in April.Westpac (rated AA-) priced a $500 million climate bond, its first of this type, along with $1.8 billion of non-climate floating rate notes.The pricing of both sets of five-year notes at exactly the same margin of 117 bps over the bank bill swap rate demonstrates once again that bond investors are reluctant to pay a premium for climate or green bonds.Asset backed securities investors, however, did pay a five bps premium to buy green notes issued by FlexiGroup in April.QPH Finance Co (rated BBB), the financing vehicle for the Port of Brisbane, made its third visit to the market and is arguably the first true corporate issue of 2016, if Airservices Australia doesn't qualify. QPH launched a $200 million, seven-year bond issue paying 185 bps over swap, and priced a $250 million issue at 180 bps over.Such was the level of investor demand in a market that has been starved of true corporate issuance.The international auto sector was represented by Hyundai Capital Services (rated BBB+). Making just its second visit to the market since debuting in May 2013, Hyundai sold $350 million of five-year bonds priced at a spread of 160 bps over swap.The Sydney branch of Bank of China (rated A) and Export Development Canada (rated AAA) both opened new lines.BOC sold $500 million of three-year FRNs at a margin of 120 bps over bank bills and EDC's sold $300 million of five-year bonds at a margin of 64.5 bps over commonwealth government securities.Line tapping was restrained last week with only three lines being reopened. World Bank (rated AAA) chose to add $800 million to its January 2021 line. The increased takes the line to $1.9 billion and was priced at 54.75 bps over CGS.International Finance Corporation (rated AAA) added $50 million to its July 2026 line, taking the line to $450 million and priced at 50.75 bps over CGS.Province of Ontario (rated A+) added $60 million to its August 2025 line, taking the line to $365 million and priced at 81.75 bps