CONSOLIDATED STATEMENTS OF FINANCIAL POSITION

OPERADORA DE SITES MEXICANOS, S.A.B. DE C.V. AND SUBSIDIARIES How we addressed this key audit matter We evaluated the assumptions used to measure and recognize property and equipment on the basis of a fair value review that we performed in accordance with IAS 16 Property, Plant and Equipment and IFRS 13 Fair Value Measurement. For this review, we consid- ered and evaluated the reconciliation of the beginning and ending balances of property and equipment. Based on audit samples, we analyzed the increases reflected in property and equipment accounts by reviewing and comparing significant items to their respec- tive support documentation. We tested asset depreciation by verifying the mathemat- ical calculations underlying the depreciation and we carried out substantive analytical procedures as well. To determine the existence of potential indicators of impairment, we sought assistance from specialists and we assessed the Company's presentation and disclosure of passive infrastructure in accordance with IFRS. Notes 2h) and 7 to the accompanying consolidated financial statements include disclo- sures regarding the Company's construction and property and equipment. 2. Long-term debt Description of key audit matter We considered the Company's long-term debt a key audit matter due to the high level of professional judgment required for the valuation of these financial liabilities, which are measured at amortized cost, and since they require that we seek assistance from special- ists of the Company's management and audit specialists to carry out our audit procedures. How we addressed this key audit matter We evaluated management's calculation of the Company's debt and we applied analyt- ical testing to the accrued interest on the debt, verifying the amounts of interest against the results of the reconciliation of interest payable. We analyzed the determination of the market value of the debt and the calculation of the interest and we verified the results of these analyses against the terms and conditions of the respective debt contracts. We compared the book balances of the debt against the balances reflected in the confirma- tion of balances that we received from the financial entities with which the Company has contracted the debt. We evaluated the risk of interest rate fluctuations considering the amount of the debt in question. We sought the assistance of specialists to determine the balance of debt recognized at amortized cost. We also evaluated the presentation and disclosure of the Company's structured notes and long-term debt in its financial state- ments considering IFRS requirements. Notes 2e) and 9 to the accompanying consolidated financial statements contain disclo- sures related to this matter. 3. Asset retirement obligation Description of key audit matter We considered the Company's asset retirement obligation a key audit matter due to the high degree of professional judgment required to calculate this obligation and because it requires the use of assumptions that involve estimates that are subjective and complex, since they require that we seek assistance from specialists of the Company's manage- ment and audit specialists to carry out our audit procedures. How we addressed this key audit matter We reviewed the Company's calculation of its asset retirement obligation and we verified the correct valuation of the principal components of the provision in accordance with IAS 37 Provisions, Contingent Liabilities and Contingent Assets. Using audit samples, we reviewed the Company's lease agreements to verify the term of each asset retirement obligation. We also received assistance from a valuation specialist to verify the reasona- bleness of the provision and we assessed the correct presentation and disclosure of the Company's asset retirement obligation in accordance with IFRS. Notes 2m) and 9 to the accompanying consolidated financial statements include disclo- sures related to the Company's asset retirement obligation. Other information Management is responsible for the other information. The other information comprises the information included in the annual report filed with the National Banking and Securi- ties Commission (CNBV, by its acronym in Spanish), but does not include the consolidat- ed financial statements and our auditor's report thereon. We expect to obtain the other information after the date of this auditor's report. Our opinion on the consolidated financial statements does not cover the other informa- tion and we do not express any form of assurance conclusion thereon. 20

View entire presentation