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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q/A

(Amendment No. 1)

(Mark One)

For the quarterly period ended March 31, 2017

OR

For the transition period from                          to                         .

Commission file number 001-36395

CERULEAN PHARMA INC.

(Exact Name of Registrant as Specified in Its Charter)

(781) 996-4300

(Registrant’s Telephone Number, Including Area Code)

(Former Name, Former Address and Former Fiscal Year, if Changed Since Last Report)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

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.    ☒

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

Number of shares of the registrant’s Common Stock, $ 0.0001 par value, outstanding on June 5, 2017: 29,031,728

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CERULEAN PHARMA INC.

FORM 10-Q/A

FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2017

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EXPLANATORY NOTE

Cerulean Pharma Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-Q/A (the “Amendment”) to its Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2017, originally filed with the Securities and Exchange Commission on May 12, 2017 (the “Quarterly Report”). This Amendment is being filed solely to include revised certifications of the Company’s principal executive officer and principal financial officer in Exhibits 31.1 and 31.2, which replace the versions of those certifications that were previously filed as Exhibits 31.1 and 31.2 to the Quarterly Report, to add language regarding internal control over financial reporting that was inadvertently omitted from such previously filed certifications. Each certification, as corrected by this Amendment, was true and correct as of the initial filing date of the Quarterly Report, May 12, 2017.

In accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), Part II, Item 4 of the Quarterly Report is hereby restated in its entirety without change, and Part II, Item 6 of the Quarterly Report is hereby amended and restated in its entirety, with the only changes to Part II, Item 6 being the addition of new certifications by our principal executive officer and principal financial officer filed herewith. Except as otherwise expressly set forth in this Amendment, no portion of the Quarterly Report is being amended or updated by this Amendment. Accordingly, this Amendment should be read in conjunction with the Quarterly Report and with our filings with the Securities and Exchange Commission subsequent to the Quarterly Report.

Unless we specify otherwise, all references in this Amendment to “we,” “our,” “us,” or “the Company” refer to Cerulean Pharma Inc.

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PART I. FINANCIAL INFORMATION

Disclosure Controls and Procedures

Our management, under the supervision and with the participation of our principal executive officer and principal financial officer, has evaluated the effectiveness of our disclosure controls and procedures as of the end of the period covered by this Quarterly Report on Form 10-Q. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosures.

Management recognizes that any disclosure controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives. Our disclosure controls and procedures have been designed to provide reasonable assurance of achieving their objectives. Based on such evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective at the reasonable assurance level as of March 31, 2017.

Changes in Internal Control Over Financial Reporting

No change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred during the three months ended March 31, 2017, that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

The exhibits listed in the Exhibit Index to this Quarterly Report on Form 10-Q/A are incorporated herein by reference.

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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 thereunto duly authorized.

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EXHIBIT INDEX

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