Note 10. Stock-Based Compensation

Stock Options

The 2010 Stock Incentive Plan (the “2010 Plan”) provides for the grant of equity incentive awards to employees, directors and consultants of Opexa in the form of incentive stock options or nonqualified stock options, as well as restricted stock, stock appreciation rights, restricted stock units and performance awards that may be settled in cash, stock or other property. The 2010 Plan is the successor to and continuation of Opexa’s June 2004 Compensatory Stock Option Plan (the “2004 Plan”). A total of 625,000 shares of common stock are authorized to be issued for awards made under the 2010 Plan through September 2020, plus (i) the number of shares subject to stock options outstanding under the 2004 Plan that are forfeited or terminate prior to exercise and would otherwise be returned to the share reserves under the 2004 Plan and (ii) any reserved shares under the 2004 Plan that were not issued or subject to outstanding grants. In addition, shares subject to awards granted under the 2010 Plan that terminate or expire before being exercised or settled will become available for grant under the 2010 Plan. As of September 30, 2013, options to purchase an aggregate of 1,094,854 shares were issued and outstanding.

Opexa accounts for share-based compensation, including options and nonvested shares, according to the provisions of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 718, "Share Based Payment.” During the nine months ended September 30, 2013, Opexa recognized option expense of $705,408. Unamortized stock compensation expense as of September 30, 2013 amounted to $970,912.

Stock Option Activity

A summary of stock option activity for the nine months ended September 30, 2013 is presented below:

	Number of Shares			Wtd. Avg. Exercise Price		Wtd. Avg. Remaining Contract Term (# years)		Intrinsic Value
Outstanding at January 1, 2013		824,620		$	5.54
Granted		342,572			1.96
Exercised		-			-
Forfeited and canceled		(72,338	)		5.19

Outstanding at September 30, 2013		1,094,854		$	4.45		7.7	$	184,740

Exercisable at September 30, 2013		599,188		$	5.78		6.6	$	109,111

Option awards are granted with an exercise price equal to the market price of Opexa’s stock at the date of issuance, generally have a ten-year life, and have various vesting dates that range from no vesting or partial vesting upon date of grant to full vesting on a specified date. Opexa estimates the fair value of stock options using the Black-Scholes option-pricing model and records the compensation expense ratably over the service period.

During the nine months ended September 30, 2013, an option to purchase an aggregate of 125,000 shares was granted to an employee at an exercise price of $2.34. This option has a term of ten years and has a vesting schedule of three years. Fair value of $285,226 was calculated using the Black-Scholes option-pricing model. Variables used in the Black-Scholes option-pricing model for the option issued to an employee during the nine months ended September 30, 2013 include (1) discount rate of 1.87%, (2) expected term of 5.25 years, (3) expected volatility of 194% and (4) zero expected dividends.

During the nine months ended September 30, 2013, options to purchase an aggregate of 129,000 shares were granted to employees at exercise prices ranging from $1.45 to $1.75. These options have terms of ten years and have vesting schedules of three years. Fair value of $218,348 was calculated using the Black-Scholes option-pricing model. Variables used in the Black-Scholes option-pricing model for the options issued to employees during the nine months ended September 30, 2013 include (1) discount rate range of 1.73% to 2.78%, (2) expected term of 5.25 years, (3) expected volatility of 201% to 204% and (4) zero expected dividends.

During the nine months ended September 30, 2013, options to purchase an aggregate of 88,572 shares were granted to non-employee directors at an exercise price of $1.75. These options have terms of ten years with 50% of the options issued vesting immediately and the remaining 50% of the options issued having vesting schedules of eight months to one year. Fair value of $151,867 was calculated using the Black-Scholes option-pricing model. Variables used in the Black-Scholes option-pricing model for the options issued to non-employee directors during the nine months ended September 30, 2013 include (1) discount rate of 1.73%, (2) expected term of 5.25 years, (3) expected volatility of 201% and (4) zero expected dividends.

During the nine months ended September 30, 2013, options to purchase 72,338 shares were forfeited and cancelled.

Warrant Activity

A summary of warrant activity for the nine months ended September 30, 2013 is presented below:

	Number of Shares			Wtd. Avg. Exercise Price		Wtd. Avg. Remaining Contract Term (# years)		Intrinsic Value
Outstanding at January 1, 2013		3,579,087		$	5.64
Granted		972,918			2.21
Exercised		-			-
Forfeited and canceled		(1,482,892	)		6.54

Outstanding at September 30, 2013		3,069,113		$	4.12		3.4	$	415,313

Exercisable at September 30, 2013		3,069,113		$	4.12		3.4	$	415,313

In connection with the January 2013 Notes, investors were issued five-year warrants to purchase up to an aggregate of 243,750 shares of common stock, at an exercise price of $1.24 per share. The estimated relative fair value of the investor warrants was $195,969 and was calculated using the Black-Scholes valuation model. The following assumptions were used: (1) no expected dividends, (2) risk free interest rate of 0.76%, (3) expected volatility of 191% and (4) expected life of five years. Opexa can redeem the warrants at $0.01 per share if the Company’s common stock closes at or above $10.00 per share for 20 consecutive trading days.

Pursuant to a waiver executed by the holders of in excess of two-thirds (66-2/3%) of the principal amount of the outstanding July 2012 Notes and accepted by Opexa, the original amount of the cash subject to the deposit control agreement was reduced to $500,000 on January 29, 2013. In exchange for such waiver, the Company issued warrants to the holders of the July 2012 Notes to purchase an aggregate of 187,500 shares of the Company’s common stock. The warrants have an exercise price of $1.21 per share and a five-year term. The estimated fair value of the warrants was $219,553 and was calculated using the Black-Scholes valuation model. The following assumptions were used: (1) no expected dividends, (2) risk free interest rate of 0.90%, (3) expected volatility of 191% and (4) expected life of five years. Opexa can redeem the warrants at $0.01 per underlying share of common stock if the common stock closes at or above $10.00 per share for 20 consecutive trading days. The fair value of the warrants was recognized as additional interest expense during the nine months ended September 30, 2013.

In connection with the February 2013 registered offering (See Note 9), Opexa issued warrants to the investors on February 11, 2013 to purchase an aggregate of 541,668 shares of common stock at an exercise price of $3.00 per share. These warrants have a term of four years and were immediately exercisable.

During the nine months ended September 30, 2013, warrants to purchase 1,482,892 shares were forfeited and cancelled.