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<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 1pt; margin-bottom: 1pt"><DIV STYLE="font-size: 1pt; border-top: Black 5pt solid; border-bottom: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt"><B>&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="letter-spacing: -0.1pt"><B>UNITED
STATES</B></FONT></P>

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

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

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

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

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



<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>FORM 8-K</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Pursuant to Section 13 OR 15(d) of The Securities
Exchange Act of 1934</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">Date of Report<FONT STYLE="font-size: 10pt">
(<I>Date of earliest event reported</I>)</FONT>: December 31, 2011</P>

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

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

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>ULTRA PETROLEUM CORP.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><I>(Exact name of registrant as specified in
its charter)</I></P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 34%; padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold; text-align: center">Yukon Territory, Canada</TD>
    <TD STYLE="width: 33%; padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold; text-align: center">001-33614</TD>
    <TD STYLE="width: 33%; padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold; text-align: center">N/A</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-style: italic; text-align: center"><FONT STYLE="letter-spacing: -0.1pt"><I>(State or other jurisdiction</I></FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-style: italic; text-align: center"><FONT STYLE="letter-spacing: -0.1pt"><I>(Commission File Number 001-33614)</I></FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-style: italic; text-align: center"><FONT STYLE="letter-spacing: -0.1pt"><I>(I.R.S. Employer</I></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-style: italic; text-align: center">of incorporation)</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-style: italic; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-style: italic; text-align: center">Identification No.)</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt"><I>&#9;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>400 N. Sam Houston Parkway East</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Suite 1200</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Houston, Texas 77060</B></P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 10pt"><I>Registrant's
telephone number, including area code</I></FONT>: <FONT STYLE="font-size: 10pt"> <B>(281) 876-0120</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><I>(Former name or former address, if changed
since last report.)</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt">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:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 4pt 1in; text-align: justify; text-indent: -1in"><FONT STYLE="font-family: Times New Roman, Times, Serif; letter-spacing: -0.1pt">&#9;</FONT><FONT STYLE="font-family: Wingdings">o</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif">&#9;Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 4pt 1in; text-align: justify; text-indent: -1in"><FONT STYLE="font-family: Times New Roman, Times, Serif; letter-spacing: -0.1pt">&#9;</FONT><FONT STYLE="font-family: Wingdings">o</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif">&#9;Soliciting
material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 4pt 1in; text-align: justify; text-indent: -1in"><FONT STYLE="font-family: Times New Roman, Times, Serif; letter-spacing: -0.1pt">&#9;</FONT><FONT STYLE="font-family: Wingdings">o</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif">&#9;Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: -1in"><FONT STYLE="font-family: Times New Roman, Times, Serif; letter-spacing: -0.1pt">&#9;</FONT><FONT STYLE="font-family: Wingdings">o</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif">&#9;Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt">&nbsp;</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt"><B>Item
8.01.&#9;Other Events</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt"><B>&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt"><B>&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="letter-spacing: -0.1pt">Ultra
Petroleum Corp. (the &ldquo;Company&rdquo;) issued a news release today announcing the Company&rsquo;s 2011 proved reserves. The
press release is attached to this Report as Exhibit 99.1.</FONT></P>



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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt"><B>&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.1pt"><B>Item
9.01<FONT STYLE="text-transform: uppercase">.&#9;</FONT>Financial Statements and Exhibits </B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top">
<TD STYLE="width: 55.5pt"></TD><TD STYLE="width: 19.5pt"><B>(d)</B></TD><TD><B>Exhibits </B></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 55.5pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 55.5pt"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font-family: Times New Roman, Times, Serif">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 9%">&nbsp;</TD>
    <TD STYLE="width: 9%; padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-decoration: underline">Exhibit No.</TD>
    <TD STYLE="width: 82%; padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt"><U>Description </U> </TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt">99.1</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt">News Release dated February 16, 2012.&nbsp;</TD></TR>
</TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 55.5pt"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 24.5pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 75pt">&nbsp;</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.75in">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: 0">&nbsp;</p><P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; text-indent: 0; margin-top: 0pt; margin-bottom: 6pt">&nbsp;</P>

<TABLE BORDER="0" CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR>
    <TD STYLE="vertical-align: top">&nbsp;February 16, 2012</TD>
    <TD COLSPAN="2"><B><B>ULTRA PETROLEUM CORP.</B></B></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; width: 50%">&nbsp;</TD>
    <TD STYLE="width: 4%">By:&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 46%">/s/ Kelly L. Whitley</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top; border-top: #000000 1px solid">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0in">Name: Kelly L. Whitley<br>Title: Assistant Corporate Secretary</P></TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; text-indent: 0pt; margin-top: 0pt; margin-bottom: 6pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 3in; text-indent: 0.5in">&nbsp;</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 55.5pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 24.5pt">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font-family: Times New Roman, Times, Serif">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 9%; padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-decoration: underline">Exhibit No.</TD>
    <TD STYLE="width: 82%; padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt"><U>Description </U> </TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt">99.1</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt">News Release dated February 16, 2012.&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 24.5pt"></P>

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

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



<P STYLE="margin: 0"></P>

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{"company-data": {"conformed-name": "ULTRA PETROLEUM CORP", "cik": "0001022646", "assigned-sic": "1311", "irs-number": "000000000", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-33614", "film-number": "12620288"}, "business-address": {"street1": "363 N SAM HOUSTON PARKWAY E", "street2": "SUITE 1200", "city": "HOUSTON", "state": "TX", "zip": "77060", "phone": "2818760120"}, "mail-address": {"street1": "363 N SAM HOUSTON PARKWAY 3", "street2": "SUITE 1200", "city": "HOUSTON", "state": "TX", "zip": "77060"}}
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
)
: December 31, 2011
ULTRA PETROLEUM CORP.
(Exact name of registrant as specified in
its charter)
Yukon Territory, Canada
001-33614
N/A
(State or other jurisdiction
(Commission File Number 001-33614)
(I.R.S. Employer
of incorporation)
Identification No.)
400 N. Sam Houston Parkway East
Suite 1200
Houston, Texas 77060
(Address of principal executive offices,
including zip code)
Registrant's
telephone number, including area code
:
(281) 876-0120
(Former name or former address, if changed
since last report.)
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:
o
Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting
material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item
8.01.	Other Events
Ultra
Petroleum Corp. (the "Company") issued a news release today announcing the Company's 2011 proved reserves. The
press release is attached to this Report as Exhibit 99.1.
Item
9.01
.
Financial Statements and Exhibits
(d)
Exhibits
Exhibit No.
Description
99.1
News Release dated February 16, 2012.
SIGNATURES
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.
February 16, 2012
ULTRA PETROLEUM CORP.
By:
/s/ Kelly L. Whitley
Name: Kelly L. Whitley
Title: Assistant Corporate Secretary
EXHIBIT INDEX
Exhibit No.
Description
99.1
News Release dated February 16, 2012.