Harvard University's ongoing legal battles and the return to market by Chicago's Regional Transportation Authority lead a host of municipal topics in April.

The top 10 saw some changes, with Gilmore & Bell and Squire Patton Boggs entering the top 10, while Troutman Pepper Locke and Ballard Spahr were bumped.

The tax exemption is in the eye of a legislative storm to extend President Donald Trump's Tax Cuts and Jobs Act, but is it only the start of what's to come?

The top 10 issuers accounted for $22.12 billion of the total issuance for the year, or 18.7%

The top 10 advisors accounted for $59.412 billion of par.

The Boston-based Nixon Peabody added seasoned municipal finance expert Michael Melzer as a partner, while Barclays lost three professionals.

Siebert Williams Shank was the only new entrant into the top 10, knocking Piper Sandler out.

In March, BlackRock debuted a new tax-exempt municipal interval fund, IMTC inked partnerships with Franklin Templeton and T. Rowe Price and more.

The top five bond financings totaled more than $7 billion.

Notable deals include a $600 million refunding deal by the New York City Municipal Water Authority and almost $400 million from Rochester, Minnesota.