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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt"><B>UNITED STATES</B>&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Washington, D.C. 20549 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid"><B>Form
8-K</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>CURRENT REPORT </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Pursuant to Section&nbsp;13 or 15(d)
of the </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Securities Exchange Act of 1934 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Date of Report (Date of earliest event
reported): </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">July 31, 2012</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Rio Bravo Oil, Inc. </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid"><B>(Exact
name of registrant) </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;&nbsp;</P>

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    <TD STYLE="width: 34%">&nbsp;</TD>
    <TD STYLE="width: 1%; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="width: 30%">&nbsp;</TD>
    <TD STYLE="width: 1%; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="width: 34%">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center">Nevada</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">000-54564</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">42-1771917</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">(State of Incorporation)</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">(Commission File Number)</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">(I.R.S. Employer Identification Number)</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">5858 Westheimer, Suite 699</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Houston, TX 77057</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(Address of principal executive offices
and zip code)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">713-787-9060</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(Registrant&rsquo;s telephone number,
including area code) </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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    <TD>Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</TD></TR>
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    <TD STYLE="width: 4%"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD>Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</TD></TR>
</TABLE>
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    <TD STYLE="width: 4%"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD>Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</TD></TR>
</TABLE>
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    <TD STYLE="width: 4%"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD>Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;<B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Item 5.03 &nbsp;&nbsp;Amendments to Articles of
Incorporation or Bylaws; Change in Fiscal Year.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">On July 31, 2012, the Company&rsquo;s Board
of Directors approved the creation of Series C Redeemable Convertible Preferred Stock and designated 12,000,000 shares of the Company&rsquo;s
authorized Preferred Stock par value $0.001 as Series C Redeemable Convertible Preferred Stock par value $0.001 (&ldquo;Series
C Preferred Stock). The Series C Preferred Stock has a dividend preference and liquidation preference over the Company&rsquo;s
Common Stock. The Certificate of Designation for Series C Convertible Preferred Stock par value $0.001 was filed with the Nevada
Secretary of State on July 31, 2012.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">The Series C Preferred Stock has an Original
Issue Price of $1.00 per share and carries a Cumulative Series C Preferred Stock Dividend of five percent (5%) per annum payable
on a quarterly basis in cash or in kind at the option of the Company.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Each share of Series C Preferred Stock
may be converted by any holder thereof, without any further consideration, at any time, into 1.11 shares of Company Common Stock
(the &ldquo;Conversion Rate&rdquo;). The Conversion Rate is subject to adjustment as detailed in the Certificate of Designation.
Further, each share of Series C Preferred Stock shall be automatically converted into shares of the Company&rsquo;s Common Stock
at the Conversion Rate upon the occurrence of any of the following events:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-align: justify">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">(a)</TD><TD STYLE="text-align: justify">The shares of the Corporation&rsquo;s Common Stock shall trade at a price of over $1.75 per share
(as adjusted) for a period in excess of thirty (30) consecutive trading days and the shares of the Company&rsquo;s Common Stock
underlying the Series B Preferred Stock are either (i) included in an effective registration statement or (ii) eligible to be traded
pursuant to an applicable exemption from registration.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-align: justify">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">(b)</TD><TD STYLE="text-align: justify">The closing of a Qualified Sale in accordance with the terms of the Certificate of Designation.
For these purposes, &ldquo;Qualified Sale&rdquo; means (1) the sale of all or substantially all of the assets of the Company or
the outstanding shares of capital stock of the Company entitled to vote generally for the election of directors, in any such case
for cash or securities having a value of at least $5.00 per share of Common Stock (as adjusted), but excluding any such transaction
in which the consideration received by the Company or its stockholders includes securities of the purchaser and such purchaser
is not subject to the reporting requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">(c)</TD><TD STYLE="text-align: justify">The merger of the Company which results in the shareholders of the Company prior to the merger
owning less than fifty percent (50%) of the voting power of the Company following the merger.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">(d)</TD><TD STYLE="text-align: justify">An underwritten initial public offering of the Company&rsquo;s shares with gross proceeds of at
least $50,000,000.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">A copy of the Certificate of Designations
for the Company&rsquo;s Series C Redeemable Convertible Preferred Stock is attached to this Report as Exhibit 4.1.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Item&nbsp;9.01. &nbsp;&nbsp;Financial Statements
and Exhibits.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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    <TD STYLE="width: 5%; padding-right: 5.4pt; text-align: left">&nbsp;(d)</TD>
    <TD STYLE="width: 95%; padding-right: 5.4pt; padding-left: 5.4pt">Exhibits</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left">Exhibit 4.1</TD><TD STYLE="text-align: justify">Certificate of Designation for Series C Redeemable Convertible
Preferred Stock par value $0.001</TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 67.5pt; text-align: justify; text-indent: -67.5pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">SIGNATURE</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Pursuant to the requirements of the Securities Exchange Act
of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TR>
    <TD STYLE="width: 16%; padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="width: 76%; padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="padding-right: 5.4pt; padding-bottom: 13pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-bottom: 13pt; padding-left: 5.4pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="3" STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">RIO BRAVO OIL, INC.</TD></TR>
<TR>
    <TD STYLE="padding-right: 5.4pt; padding-bottom: 13pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding-right: 5.4pt; padding-bottom: 13pt; padding-left: 5.4pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">By:</TD>
    <TD STYLE="vertical-align: bottom; padding-right: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">/s/ Carlos E. Buchanan II</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">__________________________</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P></TD></TR>
<TR>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Name:</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Carlos E. Buchanan II</TD></TR>
<TR>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Title:</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Chief Financial Officer</TD></TR>
<TR>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Dated:</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">July 31, 2012&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"> </P>

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form
8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the
Securities Exchange Act of 1934
Date of Report (Date of earliest event
reported):
July 31, 2012
Rio Bravo Oil, Inc.
(Exact
name of registrant)
Nevada
000-54564
42-1771917
(State of Incorporation)
(Commission File Number)
(I.R.S. Employer Identification Number)
5858 Westheimer, Suite 699
Houston, TX 77057
(Address of principal executive offices
and zip code)
713-787-9060
(Registrant's telephone number,
including area code)
Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
¨
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
¨
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
¨
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
¨
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 5.03   Amendments to Articles of
Incorporation or Bylaws; Change in Fiscal Year.
On July 31, 2012, the Company's Board
of Directors approved the creation of Series C Redeemable Convertible Preferred Stock and designated 12,000,000 shares of the Company's
authorized Preferred Stock par value $0.001 as Series C Redeemable Convertible Preferred Stock par value $0.001 ("Series
C Preferred Stock). The Series C Preferred Stock has a dividend preference and liquidation preference over the Company's
Common Stock. The Certificate of Designation for Series C Convertible Preferred Stock par value $0.001 was filed with the Nevada
Secretary of State on July 31, 2012.
The Series C Preferred Stock has an Original
Issue Price of $1.00 per share and carries a Cumulative Series C Preferred Stock Dividend of five percent (5%) per annum payable
on a quarterly basis in cash or in kind at the option of the Company.
Each share of Series C Preferred Stock
may be converted by any holder thereof, without any further consideration, at any time, into 1.11 shares of Company Common Stock
(the "Conversion Rate"). The Conversion Rate is subject to adjustment as detailed in the Certificate of Designation.
Further, each share of Series C Preferred Stock shall be automatically converted into shares of the Company's Common Stock
at the Conversion Rate upon the occurrence of any of the following events:
(a)
The shares of the Corporation's Common Stock shall trade at a price of over $1.75 per share
(as adjusted) for a period in excess of thirty (30) consecutive trading days and the shares of the Company's Common Stock
underlying the Series B Preferred Stock are either (i) included in an effective registration statement or (ii) eligible to be traded
pursuant to an applicable exemption from registration.
(b)
The closing of a Qualified Sale in accordance with the terms of the Certificate of Designation.
For these purposes, "Qualified Sale" means (1) the sale of all or substantially all of the assets of the Company or
the outstanding shares of capital stock of the Company entitled to vote generally for the election of directors, in any such case
for cash or securities having a value of at least $5.00 per share of Common Stock (as adjusted), but excluding any such transaction
in which the consideration received by the Company or its stockholders includes securities of the purchaser and such purchaser
is not subject to the reporting requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended.
(c)
The merger of the Company which results in the shareholders of the Company prior to the merger
owning less than fifty percent (50%) of the voting power of the Company following the merger.
(d)
An underwritten initial public offering of the Company's shares with gross proceeds of at
least $50,000,000.
A copy of the Certificate of Designations
for the Company's Series C Redeemable Convertible Preferred Stock is attached to this Report as Exhibit 4.1.
Item 9.01.   Financial Statements
and Exhibits.
(d)
Exhibits
Exhibit 4.1
Certificate of Designation for Series C Redeemable Convertible
Preferred Stock par value $0.001
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act
of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
RIO BRAVO OIL, INC.
By:
/s/ Carlos E. Buchanan II
__________________________
Name:
Carlos E. Buchanan II
Title:
Chief Financial Officer
Dated:
July 31, 2012