firms Unlike the other Greeks, implied volatility was unknown. 6 t Implied volatility Realized volatility t + 1 • It was calculated by reverse engineer process from the option price at time t. • Implied

strong and should still gradually result in industry’s ARPU uplift. For fixed broadband, operators have been more competitive in expanding fibre footprint to acquire and retain customers. Therefore

]St0 HC = Ct1−[Delta]St1 DeltaBS = f ( St0, K, T, r, σ ) Historical statistic : Standard deviation Implied statistic : Min ∑ (Cmarket – C theoretical) 2 DeltaWM = f ( St0, K, T, r, μ, σ* ) σ* = f (r, μ

Environment Mobile market continued to grow following customer behavior using more mobile data while 4G penetration expanding. Handset subsidies stay as a key attraction for operators to acquire and retain

personal expenses and the depreciation because of the expanding capacity of subsidiaries. Sincerely yours, (Mr.Pongpat Patanavanich) Managing Director

Consolidated net loss for the period (Q1) amount -4.57 million compare with the same period (Q1) for the last year amount -2.80 because the Company Cost of Market Development of Expanding the customer base and

operations & Administrative expenses increased by Baht 97.94 million or 6.79 % due to the Medical personal expenses which was in line with the increased revenue,also increased because of the expanding capacity

& Administrative expenses increased by Baht 23.54 million or 13.02 % due to the Medical personal expenses also increased because of the expanding capacity of subsidiaries. 3. Finance costs increased by Baht 13.17

increased . 1.2 Cost of hospital operations increased by Baht 33.70 million or 7.89% mainly due to the Medical personal expenses also increased because of the expanding capacity of subsidiaries. 1.3 Selling

ไดรบัอนุญาต ตองจัดใหมีการเปดเผยขอมูลเพื่อเปรียบเทียบคาความผันผวนแฝง (implied volatility) กับคาความผันผวนในอดีต (historical volatility) บน website ของผูออก DW โดยเปนการเปดเผย อยางตอเนื่อง