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Section 1: CORRESP


Byline Bancorp, Inc.

180 North LaSalle Street, Suite 300

Chicago, Illinois 60601



February 12, 2019




United States Securities and Exchange Commission,
Division of Corporation Finance,
100 F Street, N.E.,
Washington, D.C. 20549,

Attention: Chris Dunham.


Re:                             Byline Bancorp, Inc.
Registration Statement on Form S-4
File No. 333-229179                        


Ladies and Gentlemen:


Pursuant to Rule 461 under the Securities Act of 1933, as amended, Byline Bancorp, Inc. hereby requests that the effective date of its Registration Statement on Form S-4, File No. 333-229179, as amended, be accelerated to 4:00 P.M. Eastern Time on Thursday, February 14, 2019 or as soon thereafter as practicable.


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Please contact Catherine M. Clarkin of Sullivan & Cromwell LLP at (212) 558-4175 or by email at with any questions you may have.  In addition, please notify Ms. Clarkin when this request for acceleration has been granted.



Very truly yours,






Byline Bancorp, Inc.







/s/ Alberto J. Paracchini




Alberto J. Paracchini




President and Chief Executive Officer


cc:                                Catherine M. Clarkin

Donald J. Toumey

(Sullivan & Cromwell LLP)


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