Equity (Tables)

12 Months Ended

Dec. 31, 2013

BioTime has issued warrants to purchase its common shares. Activity related to warrants in 2013, 2012, and 2011 is presented in the table below:

	Number of Warrants			Per share exercise price		Weighted Average Exercise Price
Outstanding, January 1, 2011		649,000		$	0.68 - 10.00	$	6.42
Granted in 2011		206,613			10.00		10.00
Exercised in 2011		(219,000	)		0.68 - 3.00		1.94
Outstanding, December 31, 2011		636,613		$	3.00 – 10.00	$	9.13
Expired in 2012		(80,000	)		3.00		3.00
Outstanding, December 31, 2012		556,613		$	10.00	$	10.00
Granted in 2013		9,195,002			5.00		5.00
Outstanding, December 31, 2013		9,751,615		$	5.00 – 10.00	$	5.29

Summary of stock option activity for subsidiaries

A summary of all option activity under the subsidiary option plans (see Note 10) for the years ended December 31, 2013, 2012, and 2011 is as follows:

	Options Available for Grant			Number of Options Outstanding			Weighted Average Exercise Price
January 1, 2011		7,703,060			4,312,640		$	0.74
Added upon adoption of option plan in 2011		8,000,000			-			-
Granted in 2011		(4,685,000	)		4,685,000			0.36
Forfeited/Exercised in 2011		200,000			(200,000	)		0.05
December 31, 2011		11,218,060			8,797,640		$	0.56
Reverse stock split and change in plan in 2012		(3,697,014	)		(2,460,717	)		-
Granted in 2012		(1,479,490	)		1,479,490			1.39
Forfeited/Exercised in 2012		-			-			-
December 31, 2012		6,041,556			7,816,413		$	0.93
Increase option pool		500,000			-			-
Granted in 2013		(4,434,995	)		4,434,995			2.11
Expired/Forfeited/Exercised in 2013		785,000			(785,000	)		1.95
December 31, 2013		2,891,561			11,466,408		$	1.32

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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