Exhibit (a)(xii)

TEKLA HEALTHCARE INVESTORS

Amendment to Declaration of Trust

Notice of Change of Trustee

WHEREAS, Dr. Elizabeth G. Nabel tendered  her resignation  as a Trustee of Tekla Healthcare Investors (the “Fund”) effective June 13, 2019, the Fund issues this notice in accordance with the terms of the Declaration of Trust of the Fund, dated and filed with the Secretary of State of the Commonwealth of Massachusetts on October 31, 1986, as amended;

NOW, THEREFORE, as a result of the foregoing Trustee resignation, the six Trustees of the Tekla Healthcare Investors are:

Rakesh K. Jain, Ph.D.	100 Federal Street, 19th Floor
	Boston, MA 02110
Thomas M. Kent	100 Federal Street, 19th Floor
	Boston, MA 02110
Daniel R. Omstead, Ph.D.	100 Federal Street, 19th Floor
	Boston, MA 02110
Oleg M. Pohotsky	100 Federal Street, 19th Floor
	Boston, MA 02110
William S. Reardon	100 Federal Street, 19th Floor
	Boston, MA 02110
Lucinda H. Stebbins	100 Federal Street, 19th Floor
	Boston, MA 02110

IN WITNESS WHEREOF, this Notice has been subscribed this 20th day of June, 2019, by the undersigned who affirms that the statements made herein are true under the penalties of perjury.

/s/Laura Woodward

Laura Woodward, Secretary