Item 2.01. Completion of Acquisition or Disposition of Assets.

The information set forth in the Introduction to this Current Report on Form 8-K (the "Introduction") is incorporated into this Item 2.01 by reference.

Item 3.01. Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

In connection with the closing of the Merger, the Company notified The NASDAQ Stock Market ("NASDAQ") of its intent to remove its common stock from listing on NASDAQ and requested NASDAQ file a Notification of Removal from Listing and/or Registration on Form 25 with the Securities and Exchange Commission (the "SEC") to delist and deregister its shares of common stock (the "Shares"). The Company intends to file with the SEC a Form 15 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), requesting the deregistration of the Shares and the suspension of the Company's reporting obligations under Sections 13 and 15(d) of the Exchange Act. Trading of the Shares on NASDAQ was suspended as of the closing of trading on January 27, 2020.

Item 3.03 Material Modification to Rights of Security Holders.

The information set forth in the Introduction and in Item 5.03 to this Current Report on Form 8-K is incorporated into this Item 3.03 by reference.

Effective as of the effective time of the Merger (the "Effective Time"), each share of Company common stock (a "Share") issued and outstanding immediately prior to the Effective Time (other than certain excluded shares as described in the Merger Agreement) was automatically converted into the right to receive (1) $6.30 in cash, without interest (the "Cash Merger Consideration"), and (2) one contractual contingent value right (a "CVR") pursuant to the Contingent Value Rights Agreement, dated January 28, 2020 (the "CVR Agreement"), between Parent and Computershare Inc.

The CVRs are not transferable except under certain limited circumstances, will not be evidenced by a certificate or other instrument and will not be registered or listed for trading. The CVRs will not have any voting or dividend rights and will not represent any equity or ownership interest in Parent, Merger Sub, the Company or any of their affiliates.

Each CVR represents the right to receive (1) $1.00 upon the earlier of (i) first dosing of the first patient with ACH-5228 in the first Phase III clinical trial, (ii) the Conversion Date (defined in the CVR Agreement as the date when the first action specified in the protocol for the corresponding Adaptive Trial (as defined in the CVR Agreement) is taken following the decision to modify such Adaptive Trial to proceed as a Phase III clinical trial) for the first Converted Trial (as defined in the CVR Agreement) of any pharmaceutical product containing ACH-5228, and (iii) the first submission of a new drug application to market and sell any pharmaceutical product containing ACH-5228 in the United States (the "Clinical Trial Milestone"), in each case, prior to the fourth anniversary of the consummation of the Merger (the "Clinical Trial Milestone Period"), and (2) $1.00 upon Parent's first receipt of approval by the FDA of a new drug application which approval grants Parent the right to market and sell ACH-4471 in the United States (the "Regulatory Approval Milestone") prior to the date that is fifty-four months after the date of the consummation of the Merger (the "Regulatory Approval Milestone Period"). Such payments will be made on or prior to the date that is fifteen (15) business days following the achievement of the Clinical Trial Milestone or the Regulatory Approval Milestone, as applicable (the "Milestone Payment Date").

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There can be no assurance that the Clinical Trial Milestone will be achieved during the Clinical Trial Milestone Period or that the Regulatory Approval Milestone will be achieved during the Regulatory Approval Milestone Period, and that the resulting payments will be required of Parent.

In addition, at the Effective Time, each (i) compensatory option to purchase Shares (a "Company Stock Option") that was then outstanding, unexercised and vested (or which, pursuant to its terms or the terms of a contract in effect on October 15, 2019, became vested upon the consummation of the Merger), (ii) unvested Company Stock Option that was held by a Specified Holder (as defined in the Merger Agreement) (each Company Stock Option that was held by a Specified Holder, a "Specified Holder Option") who has, at or prior to the Effective Time, delivered to the Company and not revoked a Non-Competition Agreement (as that term is defined in the Merger Agreement), (iii) unvested Company Stock Option, that was not a Specified Holder Option that was held by an officer or employee of the Company other than a Specified Holder who has, at or prior to the Effective Time, delivered to the Company and not revoked a General Release (as that term is defined in the Merger Agreement), and (iv) Company Stock Option that was then outstanding and unexercised, whether or not vested, that was held by an individual who was not an officer or employee of the Company, which, in each case, had a per share exercise price that was less than the Cash Merger Consideration (each, an "In the Money Option"), was cancelled and converted into the right to receive both (i) a cash payment equal to (A) the excess, if any, of (x) the Cash Merger Consideration over (y) the exercise price payable per Share under such Company Stock Option, multiplied by (B) the total number of Shares subject to such In the Money Option immediately prior to the Effective Time (without regard to vesting) and (ii) one CVR for each Share subject to such In the Money Option immediately prior to the Effective Time (without regard to vesting).

At the Effective Time, each (i) Company Stock Option other than an In the Money Option that was then outstanding, unexercised and vested (or which, pursuant to its terms or the terms of a contract in effect on October 15, 2019, became vested upon the consummation of the Merger), (ii) unvested Company Stock Option that was not an In the Money Option that was held by a Specified Holder who has, at or prior to the Effective Time, delivered to the Company and not revoked a Non-Competition Agreement, (iii) unvested Company Stock Option that was not an In the Money Option held by an officer or employee of the Company other than a Specified Holder who has, at or prior to the Effective Time, delivered to the Company and not revoked a General Release, (iv) Company Stock Option other than an In the Money Option that was then outstanding and unexercised, whether or not . . .

Item 5.01 Changes in Control of Registrant.

The information set forth in the Introduction and under Item 2.01, 3.03 and 5.02 to this Current Report on Form 8-K is incorporated into this Item 5.01 by reference.

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As a result of the Merger, a change in control of the Company occurred, and the Company is now a wholly-owned subsidiary of Parent.

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangement.

In connection with the consummation of the Merger and as contemplated by the Merger Agreement (and not because of any disagreement with the Company), all of the directors of the Company ceased to be directors of the Company as of the Effective Time. In accordance with the terms of the Merger Agreement, at the Effective Time, the directors of Merger Sub became directors of the Company. Immediately following the Effective Time, the Company's board of directors consisted of Aradhana Sarin, Michael Elloian, and Douglas Barry.

Also in connection with the consummation of the Merger and as contemplated by the Merger Agreement (and not because of any disagreement with the Company), all of the officers of the Company ceased to be officers of the Company as of the Effective Time. In accordance with the terms of the Merger Agreement, at the Effective Time, the officers of Merger Sub became officers of the Company. Immediately following the Effective Time, the Company's officers consisted of Aradhana Sarin (as President), Michael Elloian (as Treasurer), and Douglas Barry (as Secretary).

Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

At the Effective Time, the Restated Certificate of Incorporation of the Company, as in effect immediately prior to the Effective Time, was amended and restated to be in the form of the certificate of incorporation set forth on Exhibit A to the Merger Agreement (the "Amended and Restated Certificate of Incorporation") in accordance with the terms of the Merger Agreement. In addition, at the Effective Time, the Company's bylaws, as in effect immediately prior to the Effective Time, were amended and restated to be identical to the bylaws of Merger Sub, other than the name of Merger Sub, which was replaced by the name of the Company (the "Amended and Restated Bylaws"). Copies of the Amended and Restated Certificate of Incorporation and the Amended and Restated Bylaws are filed as Exhibits 3.1 and 3.2 to this Current Report on Form 8-K, respectively, and are incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.



(d) Exhibits.



Exhibit
  No.                                     Description

3.1            Amended and Restated Certificate of Incorporation of Achillion
             Pharmaceuticals, Inc.

3.2            Amended and Restated Bylaws of Achillion Pharmaceuticals, Inc.

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