X0303 4 2010-08-13 0 0001056358 MANNATECH INC MTEX 0001184048 CLARK BRYAN K 600 S ROYAL LN #200 COPPELL TX 75019 0 1 0 0 Exec VP & Chief Legal Officer Right to Purchase Common Stock 13.82 2010-08-13 4 D 0 30000 0 D 2016-08-27 Common Stock, Par Value $0.0001 per share 30000 27000 D Right to Purchase Common Stock 7.31 2010-08-13 4 D 0 6000 0 D 2017-09-05 Common Stock, Par Value $0.0001 per share 6000 21000 D Right to Purchase Common Stock 6.39 2010-08-13 4 D 0 6000 0 D 2018-02-21 Common Stock, Par Value $0.0001 per share 6000 15000 D Right to Purchase Common Stock 2.46 2010-08-16 4 A 0 17933 0 A 2020-08-15 Common Stock, Par Value $0.0001 per share 17933 32933 D The option provided for vesting in three equal annual installments beginning August 28, 2007. The option provided for vesting in three equal annual installments beginning September 6, 2008. The option provided for vesting in three equal annual installments beginning February 22, 2009. On August 16, 2010, the issuer canceled, pursuant to the issuer's option exchange program, an option for 30,000 shares of Mannatech common stock granted to the reporting person on August 28, 2006. In exchange, the reporting person received a replacement option, for 10,748 shares, having an exercise price of $2.46 a share. On August 16, 2010, the issuer canceled, pursuant to the issuer's option exchange program, an option for 6,000 shares of Mannatech common stock granted to the reporting person on September 6, 2007. In exchange, the reporting person received a replacement option, for 3,440 shares, having an exercise price of $2.46 a share. On August 16, 2010, the issuer canceled, pursuant to the issuer's option exchange program, an option for 6,000 shares of Mannatech common stock granted to the reporting person on February 22, 2008. In exchange, the reporting person received a replacement option, for 3,745 shares, having an exercise price of $2.46 a share. The option vests in three equal annual installments beginning August 16, 2011. /s/ Stephen D. Fenstermacher, Co-CEO and CFO, by Power of Attorney 2010-08-17