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EXHIBIT 15.4
January 7, 2019
Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549
Commissioners:
We have read the statements made by Gridsum Holding Inc. under Item 16F of its Form20-F dated January 7, 2019. We agree with the statements concerning our Firm in such Form 20-F; we are not in a position to agree or disagree with other statements of Gridsum Holding Inc. contained therein.
Very truly yours,
/s/ Marcum Bernstein & Pinchuk LLP
Marcum Bernstein & Pinchuk LLP