<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>107 - Disclosure - Stock Warrants</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

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</LabelSeparator><Level>1</Level><ElementName>us-gaap_StockholdersEquityNoteAbstract</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Stock Warrants [Abstract]</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</Level><ElementName>us-gaap_StockholdersEquityNoteDisclosureTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="from-2013-01-01-to-2013-06-30.1450.0.0.0.0.0.0.0" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --&gt;&lt;div&gt; &lt;div&gt;&lt;!--StartFragment--&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; &lt;strong&gt;NOTE 7 - STOCK WARRANTS&lt;/strong&gt;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; TEXT-INDENT: 0.5in; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; &lt;strong&gt;&lt;em&gt;Series A and Series B Stock Warrants&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; TEXT-INDENT: 0.5in; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; As a result of a completed sale of 9,117,647 units for cash proceeds of $15,500,000 on March 28, 2008, the Company issued Series A stock warrants of 242,611 and Series B stock warrants of 241,705 which can be converted on a one-for-one basis into shares of the Company&amp;#39;s common stock. The stock warrants have a five year life and the Series A warrants are exercisable at an equivalent price of $81.60 per share and the Series B are exercisable at an equivalent price of $102.00 per share. These stock warrants expired on March 28, 2013 pursuant to the warrant agreements.&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; TEXT-INDENT: 0.5in; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; The Company used the Black-Scholes option pricing model to determine the fair value of the Series A and B stock warrants on March 28, 2008 (assumptions used - expected life of 5 years, volatility of 89%, risk free interest rate of 2.51%, and expected dividend yield of 0%).&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; TEXT-INDENT: 0.5in; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; Effective January 1, 2009, the Company adopted the provisions of FASB ASC Topic 815, "Derivatives and Hedging" ("ASC 815") (previously EITF 07-5, "Determining Whether an Instrument (or an Embedded Feature) is Indexed to an Entity&amp;#39;s Own Stock"). As a result of adopting ASC 815, warrants to purchase 484,315 of the Company&amp;#39;s common stock previously treated as equity pursuant to the derivative treatment exemption were no longer afforded equity treatment as there was a down-round protection (full-ratchet down round protection).&amp;nbsp;&amp;nbsp;&amp;nbsp;As a result, the warrants were not considered indexed to the Company&amp;#39;s own stock, and as such, all future changes in the fair value of these warrants were recognized in earnings until such time as the warrants are exercised or expire.&amp;nbsp;&amp;nbsp;The Company reclassified the fair value of these warrants from equity to liability, as if these warrants were treated as a derivative liability. On January 1, 2009, the Company recorded as a cumulative effect adjustment of decreasing additional paid-in capital of $6,020,000 and beginning retained earnings of $2,792,017 and $8,812,017 to warrant liabilities to recognize the fair value of such warrants. The fair value of the warrants was $44,304,034 on December 31, 2009. The Company recognized $35,492,017 loss from the change in fair value of warrants for the year ended December 31, 2009.&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; The Company amended Series A and Series B stock warrant agreements deleting the down-round protection (full-ratchet down round protection) provision on March 24, 2010. As a result of this amendment, the Company is no longer required to treat Series A and Series B warrants as a liability and was reclassified to equity as of March 24, 2010 (assumption used - expected life of 3 years, volatility of 57%, and risk free interest rate of 1.67%, and expected dividend yield of 0%).&amp;nbsp;Based on the revaluation,&amp;nbsp;the Company recognized $7,801,649 of income related to this transaction and reclassified $36,502,385 to equity for the year ended December 31, 2010.&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; TEXT-INDENT: 0.5in; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; &lt;strong&gt;&lt;em&gt;Warrant C&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; TEXT-INDENT: 0.5in; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; On January 22, 2010, the Company issued a warrant ("Warrant C") to a non-related individual in exchange for consulting services relating to operational and managerial experience. Warrant C can be converted into 8,333 shares of the Company&amp;#39;s common stock at an exercise price of $120 per share. Warrants C has a five year term and became exercisable 180 days from the date of issuance of Warrant C.&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; The Company recognized share-based compensation cost based on the grant-date fair value estimated in accordance with ASC 505-50 "equity based payments to non-employees". The fair value of these stock warrants on the date of grant was estimated using the Black-Scholes method (assumption used - expected life of 2.75 years, volatility of 54%, and risk free interest rate of 1.25%, and expected dividend yield of 0%). The Company recognized $558,180 of compensation expense related to this transaction.&amp;nbsp;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; font-size-adjust: none; font-stretch: normal"&gt; A summary of the Company&amp;#39;s stock warrant activities are as follows:&lt;/p&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; TEXT-INDENT: 0.5in; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;table style="BORDER-COLLAPSE: collapse; FONT: 10pt Times New Roman, Times, Serif; WIDTH: 100%; font-size-adjust: none; font-stretch: normal" cellspacing="0" cellpadding="0"&gt; &lt;tr style="VERTICAL-ALIGN: bottom"&gt; &lt;td nowrap="nowrap"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 1pt" nowrap="nowrap"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 1pt solid; FONT-WEIGHT: bold; TEXT-ALIGN: center" colspan="2" nowrap="nowrap"&gt;Shares&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 1pt" nowrap="nowrap"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 1pt" nowrap="nowrap"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 1pt solid; FONT-WEIGHT: bold; TEXT-ALIGN: center" colspan="2" nowrap="nowrap"&gt;Weighted&lt;br /&gt; Average&lt;br /&gt; Exercise&lt;br /&gt; Price&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 1pt" nowrap="nowrap"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 1pt" nowrap="nowrap"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 1pt solid; FONT-WEIGHT: bold; TEXT-ALIGN: center" colspan="2" nowrap="nowrap"&gt;Weighted&lt;br /&gt; Average&lt;br /&gt; Remaining&lt;br /&gt; Contractual&lt;br /&gt; Term&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 1pt" nowrap="nowrap"&gt; &amp;nbsp;&lt;/td&gt; &lt;/tr&gt; &lt;tr style="VERTICAL-ALIGN: bottom; BACKGROUND-COLOR: rgb(204,255,204)"&gt; &lt;td style="WIDTH: 55%"&gt;Balance - December 31, 2012&lt;/td&gt; &lt;td style="WIDTH: 1%"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left; WIDTH: 1%"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: right; WIDTH: 12%"&gt;490,369&lt;/td&gt; &lt;td style="TEXT-ALIGN: left; WIDTH: 1%"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="WIDTH: 1%"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left; WIDTH: 1%"&gt;$&lt;/td&gt; &lt;td style="TEXT-ALIGN: right; WIDTH: 12%"&gt;92.24&lt;/td&gt; &lt;td style="TEXT-ALIGN: left; WIDTH: 1%"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="WIDTH: 1%"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left; WIDTH: 1%"&gt;$&lt;/td&gt; &lt;td style="TEXT-ALIGN: right; WIDTH: 12%"&gt;0.27&lt;/td&gt; &lt;td style="TEXT-ALIGN: left; WIDTH: 1%"&gt;&amp;nbsp;&lt;/td&gt; &lt;/tr&gt; &lt;tr style="VERTICAL-ALIGN: bottom; BACKGROUND-COLOR: white"&gt; &lt;td&gt;Exercised&lt;/td&gt; &lt;td&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: right"&gt;-&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: right"&gt;-&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: right"&gt;-&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;/tr&gt; &lt;tr style="VERTICAL-ALIGN: bottom; BACKGROUND-COLOR: rgb(204,255,204)"&gt; &lt;td style="PADDING-BOTTOM: 1pt"&gt;Cancelled&lt;/td&gt; &lt;td style="PADDING-BOTTOM: 1pt"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 1pt solid; TEXT-ALIGN: left"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 1pt solid; TEXT-ALIGN: right"&gt; -&lt;/td&gt; &lt;td style="PADDING-BOTTOM: 1pt; TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="PADDING-BOTTOM: 1pt"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 1pt solid; TEXT-ALIGN: left"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 1pt solid; TEXT-ALIGN: right"&gt; -&lt;/td&gt; &lt;td style="PADDING-BOTTOM: 1pt; TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="PADDING-BOTTOM: 1pt"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 1pt solid; TEXT-ALIGN: left"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 1pt solid; TEXT-ALIGN: right"&gt; -&lt;/td&gt; &lt;td style="PADDING-BOTTOM: 1pt; TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;/tr&gt; &lt;tr style="VERTICAL-ALIGN: bottom; BACKGROUND-COLOR: white"&gt; &lt;td&gt;&amp;nbsp;&lt;/td&gt; &lt;td&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: right"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: right"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: right"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="TEXT-ALIGN: left"&gt;&amp;nbsp;&lt;/td&gt; &lt;/tr&gt; &lt;tr style="VERTICAL-ALIGN: bottom; BACKGROUND-COLOR: rgb(204,255,204)"&gt; &lt;td style="PADDING-BOTTOM: 2.5pt"&gt;Balance - June 30, 2013&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 2.5pt"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 2.5pt double; FONT-WEIGHT: bold; TEXT-ALIGN: left"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 2.5pt double; FONT-WEIGHT: bold; TEXT-ALIGN: right"&gt; 490,369&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 2.5pt; TEXT-ALIGN: left"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 2.5pt"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 2.5pt double; FONT-WEIGHT: bold; TEXT-ALIGN: left"&gt; $&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 2.5pt double; FONT-WEIGHT: bold; TEXT-ALIGN: right"&gt; 92.24&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 2.5pt; TEXT-ALIGN: left"&gt; &amp;nbsp;&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 2.5pt"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 2.5pt double; FONT-WEIGHT: bold; TEXT-ALIGN: left"&gt; $&lt;/td&gt; &lt;td style="BORDER-BOTTOM: black 2.5pt double; FONT-WEIGHT: bold; TEXT-ALIGN: right"&gt; 0.00&lt;/td&gt; &lt;td style="FONT-WEIGHT: bold; PADDING-BOTTOM: 2.5pt; TEXT-ALIGN: left"&gt; &amp;nbsp;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;p style="FONT: 10pt Times New Roman, Times, Serif; MARGIN: 0pt 0px; TEXT-INDENT: 0.5in; font-size-adjust: none; font-stretch: normal"&gt; &amp;nbsp;&lt;/p&gt; &lt;!--EndFragment--&gt;&lt;/div&gt; &lt;/div&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. 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