Exhibit (a)(x)

TEKLA HEALTHCARE INVESTORS

Amendment to Declaration of Trust

Notice of Change of Trustee

WHEREAS, upon the death of Uwe E. Reinhardt on November 14, 2017, Tekla Healthcare Investors (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;

WHEREAS, at a meeting of the Trustees of Tekla Healthcare Investors (“The Fund”), the Trustees of the Fund appointed Mr. Thomas M. Kent as Trustee to the Fund, effective upon his written acceptance and agreement to be bound by 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 death and Trustee’s appointment, the seven Trustees of the Tekla Healthcare Investors are:

Michael W. Bonney	100 Federal Street, 19th Floor
	Boston, MA 02110
Thomas M. Kent	100 Federal Street, 19th Floor
	Boston, MA 02110
Rakesh K. Jain, Ph.D.	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 December, 2017, by the undersigned who affirms that the statements made herein are true under the penalties of perjury.

/s/Laura Woodward

Laura Woodward, Secretary