(a)(b) and (c) of Item 5 are hereby amended and
restated as follows:
(a) (b) As of November 10, 2017, Sistema held
634,674,257 Shares directly, which represent 33.02% of the Shares outstanding. Sistema has sole voting and dispositive power with
respect to the Shares it holds and will, following settlement of the purchase and sale under the Stock Purchase Agreement, hold
of record.
As of November 10, 2017, Sistema Finance held
106,186,540 Shares (in the form of Shares and ADSs) directly, which represent 5.53% of the Outstanding Shares. Sistema Finance
has sole voting and dispositive power with respect to the Shares and ADSs it holds of record. As the controlling shareholder of
Sistema Finance, Sistema may be deemed to beneficially own any Shares Sistema Finance holds of record.
As of November 10, 2017, STA held 220,467,234
Shares directly, which represent 11.47% of the Outstanding Shares. STA has sole voting and dispositive power with respect to the
Shares it holds of record. As the sole shareholder of STA, Sistema may be deemed to beneficially own any Shares STA holds of record.
As of November10, 2017, Mr. Evtushenkov did not
hold any Shares directly. As the controlling shareholder of Sistema, Mr. Evtushenkov may be deemed to beneficially own any Shares
Sistema holds directly or beneficially.
As of November 10, 2017, Dr. Ron Sommer held 129,770
Shares directly, which represent 0.0068% of the Outstanding Shares, and options to purchase138,247 Shares (which are exercisable
in 2018, 2019 and 2020), which represent 0.0072% of the Outstanding Shares. Dr. Sommer has sole voting and dispositive power with
respect to the Shares he holds of record and, upon exercise of his options, Dr. Sommer would have sole voting and dispositive power
with respect to the Shares he would hold of record upon such exercise. Prior to the exercise of his options and receipt of such
Shares, however, Dr. Sommer does not have the power to vote or direct the vote of the Shares subject to his options.
As of November 10, 2017, Mr. Andrey Dubovskov
held 467,805 Shares directly, which represent 0.0243% of the Outstanding Shares, and options to purchase 378,380 Shares (which
are exercisable in 2018, 2019 and 2020), which represent 0.0197% of the Outstanding Shares. Mr. Dubovskov has sole voting and dispositive
power with respect to the Shares he holds of record and, upon exercise of his options, Mr. Dubovskov would have sole voting and
dispositive power with respect to the Shares he would hold of record upon such exercise. Prior to the exercise of his options and
receipt of such Shares, however, Mr. Dubovskov does not have the power to vote or direct the vote of the Shares subject to his
options.
As of November 10, 2017, Mr. Vsevolod Rozanov
held 72,792 Shares directly, which represent 0.0038% of the Outstanding Shares. Mr. Rozanov has sole voting and dispositive power
with respect to the Shares he holds of record.
Except as set forth in this Item 5(a)-(b) of this
Amendment, to the knowledge of the Reporting Persons, none of the persons set forth in Exhibit A held any Shares directly or has
the right to vote or dispose of any Shares held by Sistema, Sistema Finance or STA as of November 10, 2017.
The Reporting Persons may be deemed to be a group
in relation to their respective holdings of Shares. The Reporting Persons do not affirm the existence of a group.
Except as set forth in this Item 5(a)-(b) of this
Amendment and the Schedule 13D, each of the persons named in this Item 5(a)-(b) of this Amendment and the Schedule 13D disclaims
beneficial ownership of any Shares owned beneficially or of record by any other person named in this Item 5(a)-(b) of this Amendment
and the Schedule 13D.
(c) Except as set in this Amendment and the Schedule
13D, none of the Reporting Persons nor, to the knowledge of the Reporting Persons, any person identified on Exhibit A, has effected
any transaction in the Shares during the past 60 days.
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