UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 17, 2017

PCSB FINANCIAL CORPORATION

(Exact Name of Registrant as Specified in its Charter)

(914) 248-7272

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Indicate by check mark whether the Registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.  ☒

If an emerging growth company, indicate by check mark if the Registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☒

On April 17, 2017, PCSB Financial Corporation (the “Company”), the proposed holding company for PCSB Bank, issued a press release to announce the expected closing date for the Company’s offering of common stock in connection with the mutual-to-stock conversion of PCSB Bank. The expected closing date is April 20, 2017. The Company’s common stock is expected to begin trading on the NASDAQ Capital Market under the trading symbol “PCSB” on April 21, 2017. For additional information, reference is made to a copy of the press release which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

99.1        Press Release dated April 17, 2017

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.