This Amendment No. 3 (this “Amendment”) amends and supplements the Tender Offer Statement on the Schedule TO (together with any amendments and supplements thereto, “Schedule TO”) filed by Covis Mergerco Inc., a Delaware corporation (the “Offeror”), Covis Group S.à r.l., a Luxembourg
private limited liability company (“Parent”), and Apollo Management IX, L.P., a Delaware limited partnership (“Management IX”), on October 15, 2020. The Offeror is a wholly owned indirect subsidiary of Parent. Parent is controlled by equity funds managed by
Management IX. The Schedule TO relates to the offer by the Offeror to purchase all of the issued and outstanding Shares at a purchase price of $13.75 per Share, net to the holders thereof, payable in cash, without interest, less
any applicable tax withholding, upon the terms and subject to the conditions set forth in the Offer to Purchase, dated October 15, 2020 (the “Offer to Purchase”), and in the related Letter of Transmittal (which, together with the Offer to Purchase, as each may be amended or supplemented from time to time in accordance with
the Agreement and Plan of Merger described below, collectively constitute the “Offer”), copies of which are annexed to and filed with the
Schedule TO as Exhibits (a)(1)(A) and (a)(1)(B), respectively. All the information set forth in the Offer to Purchase is incorporated therein by reference in response to Items 1 through 9 and Item 11 in the Schedule TO and is
supplemented by the information specifically provided in the Schedule TO. The Agreement and Plan of Merger, dated as of October 1, 2020, by and among AMAG, Parent, the Offeror, and (solely with respect to certain sections
thereof) Covis Finco S.à r.l., a copy of which is attached as Exhibit (d)(1) thereto, is incorporated by reference with respect to Items 4 through 11 of the Schedule TO. Unless otherwise indicated,
references to sections in the Schedule TO are references to sections of the Offer to Purchase.
This Amendment is being filed to amend and
supplement Items to the extent specifically provided herein.
The information set forth in the Offer to Purchase and Items 1 through 9 and Item 11 of the
Schedule TO, to the extent such Items incorporate by reference the information contained in the Offer to Purchase, are hereby amended and supplemented by adding the following text thereto:
“As the final step of the Transactions, AMAG, Parent and the Offeror effected the Merger under
Section 251(h) of the DGCL, pursuant to which the Offeror merged with and into AMAG, with AMAG surviving as a wholly owned indirect subsidiary of Parent on November 16, 2020. At the Effective Time, each Share issued and outstanding
immediately prior to the Effective Time (other than any Excluded Shares and any Shares owned by any stockholders who properly exercised their appraisal rights under Section 262 of the DGCL) was converted automatically into and now
represents only the right to receive the Merger Consideration, which is a cash amount per Share equal to the Offer Price, without interest and less any applicable withholding tax.
The Shares will now be delisted and will cease to trade on the NASDAQ. AMAG and Parent will take
steps to cause the Shares to be deregistered under the Exchange Act as promptly as practicable.
Capitalized terms used but not defined herein have the meanings ascribed thereto in the Offer to
Purchase.”