AVISTA HEALTHCARE PUBLIC ACQUISITION CORP. (NASDAQ:AHPA) Files An 8-K Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing
Item 3.01 Notice of Delisting or Failure to Satisfy a Continued Listing Ruleor Standard; Transfer of Listing

On January4, 2018, Avista Healthcare Public Acquisition Corp., a Cayman Islands exempted company (the “Company”), received a letter from the staff of the Listing Qualifications Department of The Nasdaq Stock Market (“NASDAQ”) notifying the Company that it no longer complies with NASDAQ Listing Rules5620(a)and 5810(c)(2)(G)for continued listing because it did not hold an annual meeting of stockholders within twelve months of the end of the Company’s fiscal year ended December31, 2016. The Company has 45 calendar days from January5, 2018 to submit a plan to regain compliance.

In light of the Company’s announcement of its proposed business combination with Envigo International Holdings,Inc. on August21, 2017 (the “Proposed Business Combination”) and consistent with the disclosure in the Company’s Registration Statement on FormS-4, as amended (the “FormS-4”), initially filed with the SEC on November22, 2017, the Company will hold an annual general meeting of its shareholders at which it will approve the Proposed Business Combination and related matters as well as conduct the election of directors. The Company intends to submit a plan to NASDAQ to regain compliance within the time frame allotted by NASDAQ rules.

If NASDAQ accepts the Company’s plan, NASDAQ may grant an exception of up to 180 calendar days from the fiscal year end, or until June29, 2018, to regain compliance.

Item 3.01 Other Events

The information contained in Item 3.01 of this Current Report on Form8-K is incorporated by reference herein.