[Joint Filing Agreement [Remainder of this page has been left intentionally blank.] Yan Tang Yan Tang Sichuan Zhang Sichuan Zhang Gallant Future Holdings Limited Yan Tang Director EX-99.(A) 2 d876427dex99a.htm EX-99.(A)] [CUSIP No. 60879B 107 13G Page 2 of 10 Pages 1 Name of Reporting Person Yan Tang 2 Check the Appropriate Box if a Member of a Group ¨ ¨ (a) 3 SEC Use Only 4 Citizenship or Place of Organization The People’s Republic of China Number of Shares Beneficially Owned by Each Reporting Person With 5 Sole Voting Power]

[13 G CUSIP No. 60879B107 Page 20 of 22 Pages AGREEMENT AS TO JOINT FILING OF SCHEDULE 13G Dated: February 12, 2015 SCC Growth I Holdco A, Ltd. Sequoia Capital China Growth Fund I, L.P. Sequoia Capital China Growth Partners Fund I, L.P. Sequoia Capital China GF Principals Fund I, L.P. its Members Sequoia Capital China Growth Fund Management I,] [13 G CUSIP No. 60879B107 Page 2 of 22 Pages 1 Name of reporting person SCC GROWTH I HOLDCO A, LTD. (“SCCG I HOLDCO A”) I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) 98-1141870 2 Check the appropriate box if a member of a group ¨ ¨ (a) 3 SEC use only 4 Citizenship or place of organization CAYMAN ISLANDS]

[JOINT FILING AGREEMENT Dated: February 4, 2015 ATRIX ARTNERS HINA ONG ONG IMITED M Yibo Shao Director ATRIX ARTNERS HINA M Yibo Shao Director ATRIX ARTNERS HINA M Yibo Shao Director ATRIX HINA ANAGEMENT M] [CUSIP No. 60879B 10 7 1. Names of Reporting Persons Matrix Partners China II Hong Kong Limited 2. Check the Appropriate Box if a Member of a Group (See Instructions) ¨ x (a) 3. SEC Use Only 4. Citizenship or Place of Organization Hong Kong Number of Shares Beneficially Owned by Each Reporting Person With 5. Sole Voting Power 0]