Companies issue at least $16 bln in debt.

Bank brought 5% of corporate bonds sold this year, up from 3.6% in 2009.

Bank brought 5% of corporate bonds sold this year, up from 3.6% in 2009.

Yield of 7.163% breaks record set in May 2011.

Walgreen sells $4 bln of debt, Transocean sells $1.5 bln.

Demand for high-yield debt gives borrowers more power to dictate deal terms.

Corporate bond sales see busiest start to a week since March.

Companies trying to lock in low borrowing costs sell more than $237 bln of debt.