<SEC-DOCUMENT>0001104659-12-009222.txt : 20120213
<SEC-HEADER>0001104659-12-009222.hdr.sgml : 20120213
<ACCEPTANCE-DATETIME>20120213142855
ACCESSION NUMBER:		0001104659-12-009222
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20120213
DATE AS OF CHANGE:		20120213

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			USEC INC
		CENTRAL INDEX KEY:			0001065059
		STANDARD INDUSTRIAL CLASSIFICATION:	MINING, QUARRYING OF NONMETALLIC MINERALS (NO FUELS) [1400]
		IRS NUMBER:				522107911
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-55343
		FILM NUMBER:		12598030

	BUSINESS ADDRESS:	
		STREET 1:		2 DEMOCRACY CENTER
		STREET 2:		6903 ROCKLEDGE DRIVE
		CITY:			BETHESDA
		STATE:			MD
		ZIP:			20817
		BUSINESS PHONE:		3015643200

	MAIL ADDRESS:	
		STREET 1:		2 DEMOCRACY CENTER
		STREET 2:		6903 ROCKLEDGE DRIVE
		CITY:			BETHESDA
		STATE:			MD
		ZIP:			20817

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SECURITY INVESTORS LLC
		CENTRAL INDEX KEY:			0000791185
		IRS NUMBER:				481183041
		STATE OF INCORPORATION:			KS
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		ONE SECURITY BENEFIT PLACE
		CITY:			TOPEKA
		STATE:			KS
		ZIP:			66636-0001
		BUSINESS PHONE:		(785) 438-3127

	MAIL ADDRESS:	
		STREET 1:		ONE SECURITY BENEFIT PLACE
		CITY:			TOPEKA
		STATE:			KS
		ZIP:			66636-0001

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	6TH AVENUE INVESTMENT MANAGEMENT CO LLC
		DATE OF NAME CHANGE:	20070709

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SECURITY MANAGEMENT CO LLC /KS/
		DATE OF NAME CHANGE:	19990329

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SECURITY MANAGEMENT CO
		DATE OF NAME CHANGE:	19970224
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>a12-3495_21sc13ga.htm
<DESCRIPTION>SC 13G/A
<TEXT>


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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="3" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">UNITED   STATES</font></b></p>    </td>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">SECURITIES   AND EXCHANGE COMMISSION</font></b></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington,   D.C. 20549</font></b></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>  </table>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">SCHEDULE 13G</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Under the Securities Exchange Act of 1934<br> (Amendment No.&nbsp;1)*</font></b></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<div style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;">
<p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">USEC, Inc.</font></b></p>
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<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Name of Issuer)</font></p>
<div style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 1.0pt 0in;">
<p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Common</font></b></p>
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<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Title of Class of Securities)</font></p>
<div style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 1.0pt 0in;">
<p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">90333E108</font></b></p>
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<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(CUSIP Number)</font></p>
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<p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">December 31, 2011</font></b></p>
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<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Date of Event Which Requires Filing of this Statement)</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box to designate the rule pursuant to which this Schedule is filed: </font></p>
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<td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.46%;">
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Wingdings" style="font-size:10.0pt;">x</font></p>    </td>
<td width="90%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.54%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Rule 13d-1(b)</font></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Rule 13d-1(c)</font></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Rule 13d-1(d)</font></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. </font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The information required in the remainder of this cover page shall not be deemed to be &quot;filed&quot; for the purpose of Section 18 of the Securities Exchange Act of 1934 (&quot;Act&quot;) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">CUSIP No.&nbsp;90333E108</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Names of Reporting Persons   <br>   I.R.S. Identification Nos. of above persons (entities only).</font><font size="2" style="font-size:10.0pt;"><br>   Security Investors, LLC <br>   48-1183041</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2. </font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the Appropriate Box   if a Member of a Group (See Instructions)</font></p>    </td>   </tr>
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<td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="13%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:13.1%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font></p>    </td>
<td width="78%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:78.2%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>   </tr>
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<td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="13%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:13.1%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font></p>    </td>
<td width="78%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:78.2%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>   </tr>
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<td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="13%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:13.1%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not Applicable</font></p>    </td>
<td width="78%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:78.2%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">x</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.</font></p>    </td>
<td width="91%" colspan="4" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">SEC Use Only </font></p>    </td>   </tr>
<tr>
<td width="100%" colspan="6" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.</font></p>    </td>
<td width="91%" colspan="4" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Citizenship or Place of   Organization </font><font size="2" style="font-size:10.0pt;"><br>   A limited liability company organized under the laws of the State of Kansas.</font></p>    </td>   </tr>
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<td width="13%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:13.84%;">
<p style="margin-left:0in;margin-right:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.94%;">
<p align="right" style="margin-left:0in;margin-right:0in;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="81%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:81.22%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr style="page-break-inside:avoid;">
<td width="13%" colspan="3" rowspan="7" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:13.84%;">
<p style="margin-left:0in;margin-right:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Number of<br>   Shares<br>   Beneficially<br>   Owned by<br>   Each<br>   Reporting<br>   Person With</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.94%;">
<p style="margin-left:0in;margin-right:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5.</font></p>    </td>
<td width="81%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:81.22%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Sole Voting Power </font><font size="2" style="font-size:10.0pt;"><br>   8,904,284</font></p>    </td>   </tr>
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<td width="86%" colspan="3" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr style="page-break-inside:avoid;">
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.94%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6.</font></p>    </td>
<td width="81%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:81.22%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Shared Voting Power</font><font size="2" style="font-size:10.0pt;">  <br>   -0-</font></p>    </td>   </tr>
<tr style="page-break-inside:avoid;">
<td width="86%" colspan="3" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr style="page-break-inside:avoid;">
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.94%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">7.</font></p>    </td>
<td width="81%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:81.22%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Sole Dispositive Power</font><font size="2" style="font-size:10.0pt;">  <br>   8,904,284</font></p>    </td>   </tr>
<tr style="page-break-inside:avoid;">
<td width="86%" colspan="3" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr style="page-break-inside:avoid;">
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.94%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">8.</font></p>    </td>
<td width="81%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:81.22%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Shared Dispositive Power <br>   -0-</font></p>    </td>   </tr>
<tr>
<td width="100%" colspan="6" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">9.</font></p>    </td>
<td width="91%" colspan="4" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Aggregate Amount   Beneficially Owned by Each Reporting Person</font><font size="2" style="font-size:10.0pt;"><br>   8,904,284</font></p>    </td>   </tr>
<tr>
<td width="100%" colspan="6" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.</font></p>    </td>
<td width="91%" colspan="4" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check if the Aggregate   Amount in Row (9) Excludes Certain Shares (See Instructions)&nbsp; </font><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Not applicable</font></p>    </td>   </tr>
<tr>
<td width="100%" colspan="6" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">11.</font></p>    </td>
<td width="91%" colspan="4" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Percent of Class   Represented by Amount in Row (9)</font><font size="2" style="font-size:10.0pt;"><br>   7.34%</font></p>    </td>   </tr>
<tr>
<td width="100%" colspan="6" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">12.</font></p>    </td>
<td width="91%" colspan="4" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Type of Reporting Person   (See Instructions)</font><font size="2" style="font-size:10.0pt;"><br>   IA</font></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2<a name="PB_2_081420_7056"></a></font></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 1.</font></b></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font></p>    </td>
<td width="87%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name of Issuer<br>   USEC, Inc.</font></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font></p>    </td>
<td width="87%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Address of Issuer&#146;s   Principal Executive Offices<br>   Two Democracy Center, 6903 Rockledge Dr., Bethesda, MD 20817</font></p>    </td>   </tr>
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<td width="100%" colspan="4" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<td width="100%" colspan="4" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 2.</font></b></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font></p>    </td>
<td width="87%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name of Person Filing<br>   Security Investors, LLC</font></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font></p>    </td>
<td width="87%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Address of Principal   Business Office or, if none, Residence<br>   One Security Benefit Place, Topeka, Kansas 66636-0001</font></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(c)</font></p>    </td>
<td width="87%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Citizenship<br>   Security Investors, LLC is a Kansas limited liability company.</font></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)</font></p>    </td>
<td width="87%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title of Class of   Securities<br>   Common Stock</font></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(e)</font></p>    </td>
<td width="87%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">CUSIP Number<br>   90333E108</font></p>    </td>   </tr>
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<td width="100%" colspan="4" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<td width="8%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 3.</font></b></p>    </td>
<td width="91%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.64%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">If this statement is filed pursuant   to &#167;&#167;240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is   a:</font></b></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
<td width="82%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Broker or dealer   registered under section 15 of the Act (15 U.S.C. 78o);</font></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
<td width="82%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Bank as defined in section   3(a)(6) of the Act (15 U.S.C. 78c);</font></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(c)</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
<td width="82%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Insurance company as   defined in section 3(a)(19) of the Act (15 U.S.C. 78c);</font></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
<td width="82%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Investment company   registered under section 8 of the Investment Company Act of 1940 (15 U.S.C.   80a-8);</font></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(e)</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">x</font></p>    </td>
<td width="82%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">An investment adviser in   accordance with &#167;240.13d-1(b)(1)(ii)(E);</font></p>    </td>   </tr>
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<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(f)</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
<td width="82%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">An employee benefit plan   or endowment fund in accordance with &#167;240.13d-1(b)(1)(ii)(F);</font></p>    </td>   </tr>
<tr>
<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(g)</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
<td width="82%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">A parent holding company   or control person in accordance with &#167;240.13d-1(b)(1)(ii)(G);</font></p>    </td>   </tr>
<tr>
<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(h)</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
<td width="82%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">A savings association as   defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C.   1813);</font></p>    </td>   </tr>
<tr>
<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(i)</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
<td width="82%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">A church plan that is   excluded from the definition of an investment company under section 3(c)(14)   of the Investment Company Act of 1940 (15 U.S.C. 80a-3);</font></p>    </td>   </tr>
<tr>
<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(j)</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
<td width="82%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">A non-U.S. institution in   accordance with &#167; 240.13d&#150;1(b)(1)(ii)(J);</font></p>    </td>   </tr>
<tr>
<td width="8%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:8.36%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(k)</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.38%;">
<p style="margin:3.0pt 0in 3.0pt 22.0pt;text-indent:-22.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
<td width="82%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:82.88%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Group, in accordance with   &#167; 240.13d&#150;1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance   with &#167;&nbsp;240.13d&#150;1(b)(1)(ii)(J), please specify the type of   institution:____________________________</font></p>    </td>   </tr>  </table>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3<a name="PB_3_081420_5335"></a></font></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
</div>
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<br clear="all" style="page-break-before:always;">
<div style="font-family:Times New Roman;">
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
<tr>
<td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 4.</font></b></p>    </td>
<td width="90%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Ownership</font></b></p>    </td>   </tr>
<tr>
<td width="100%" colspan="4" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Provide the following   information regarding the aggregate number and percentage of the class of   securities of the issuer identified in Item 1. </font></p>    </td>   </tr>
<tr>
<td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.12%;">
<p align="center" style="margin:3.0pt 0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font></p>    </td>
<td width="86%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amount beneficially   owned:&nbsp;&nbsp;&nbsp; </font></p>
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">As of December 31, 2011,   Security Investors, LLC has the sole power to direct the vote and dispose of   8,904,284 shares of USEC, Inc. common stock of a total of 121,300,000 shares   outstanding.**</font></p>    </td>   </tr>
<tr>
<td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.12%;">
<p align="center" style="margin:3.0pt 0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font></p>    </td>
<td width="86%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Percent of class:&nbsp;&nbsp;&nbsp; </font></p>
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">7.34% of the common stock</font></p>    </td>   </tr>
<tr>
<td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.12%;">
<p align="center" style="margin:3.0pt 0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(c)</font></p>    </td>
<td width="86%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Number of shares as to   which the person has:</font></p>
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.12%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="border:none;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.48%;">
<p align="center" style="margin:3.0pt 0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(i)</font></p>    </td>
<td width="80%" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:80.68%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Sole power to vote or to   direct the vote&nbsp;&nbsp;&nbsp; </font></p>
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">See Item 4(a) above.   8,904,284 shares of common stock</font></p>    </td>   </tr>
<tr>
<td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.12%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.48%;">
<p align="center" style="margin:3.0pt 0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(ii)</font></p>    </td>
<td width="80%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:80.68%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Shared power to vote or to   direct the vote&nbsp;&nbsp;&nbsp;&nbsp; </font></p>
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>    </td>   </tr>
<tr>
<td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.12%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.48%;">
<p align="center" style="margin:3.0pt 0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(iii)</font></p>    </td>
<td width="80%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:80.68%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Sole power to dispose or   to direct the disposition of&nbsp;&nbsp;&nbsp; </font></p>
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">See Item 4(a) above.   8,904,284 shares of common stock.</font></p>    </td>   </tr>
<tr>
<td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="4%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.12%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.48%;">
<p align="center" style="margin:3.0pt 0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(iv)</font></p>    </td>
<td width="80%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:80.68%;">
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Shared power to dispose or   to direct the disposition of&nbsp;&nbsp;&nbsp; </font></p>
<p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable</font></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<div style="margin:0in 0in .0001pt;"><hr size="1" width="25%" noshade color="black" align="left"></div>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
<tr>
<td width="0%" style="border:none;padding:0in 0in 0in 0in;">
<p style="font-size:1.0pt;margin:0in 0in .0001pt;">&nbsp;</p></td>
<td width="12%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:12.36%;">
<p style="margin:0in 0in .0001pt .75in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">**</font></p>    </td>
<td width="86%" valign="bottom" style="padding:0in 0in 0in 0in;width:86.54%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This report is being filed   on behalf of Security Investors, LLC (&#147;SI&#148;), a Kansas limited liability   company, and/or certain investment advisory clients relating to their   collective beneficial ownership of shares of common stock of the Issuer. SI   is a registered investment adviser under Section 203 of the Investment   Advisers Act of 1940. As a result of its role as investment adviser, SI may   be deemed to be the beneficial owner of the securities of the Issuer for   purposes of &#167;13(d) and 13(g) of the Securities Exchange Act of 1934. SI has   the sole power to dispose of the shares.</font></p>    </td>
<td width="0%" style="border:none;padding:0in 0in 0in 0in;">
<p style="font-size:1.0pt;margin:0in 0in .0001pt;">&nbsp;</p></td>   </tr>
<tr>
<td width="100%" colspan="5" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="9%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 5.</font></b></p>    </td>
<td width="90%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Ownership of Five Percent or Less   of a Class</font></b></p>    </td>   </tr>
<tr>
<td width="100%" colspan="5" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">If this statement is being filed to report the fact   that as of the date hereof the reporting person has ceased to be the   beneficial owner of more than five percent of the class of securities, check   the following&nbsp;&nbsp; </font><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">.</font></p>    </td>   </tr>
<tr>
<td width="100%" colspan="5" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="9%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 6.</font></b></p>    </td>
<td width="90%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Ownership of More than Five Percent   on Behalf of Another Person</font></b></p>    </td>   </tr>
<tr>
<td width="100%" colspan="5" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Certain advisory   clients of Security Investors, LLC have the right to receive or the power to   direct the receipt of dividends from or the profits from the sale of such   securities.</font></p>    </td>   </tr>
<tr>
<td width="100%" colspan="5" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="9%" colspan="2" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 7.</font></b></p>    </td>
<td width="90%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Identification and Classification   of the Subsidiary Which Acquired the Security Being Reported on By the Parent   Holding Company or Control Person</font></b></p>    </td>   </tr>
<tr>
<td width="100%" colspan="5" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>    </td>   </tr>
<tr>
<td width="100%" colspan="5" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="9%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 8.</font></b></p>    </td>
<td width="90%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Identification and Classification   of Members of the Group</font></b></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 9.</font></b></p>    </td>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Notice of Dissolution of Group</font></b></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4<a name="PB_4_081420_5796"></a></font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 10.</font></b></p>    </td>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Certification</font></b></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By signing below I   certify that, to the best of my knowledge and belief, the securities referred   to above were acquired and are held in the ordinary course of business and   were not acquired and are not held for the purpose of or with the effect of   changing or influencing the control of the issuer of the securities and were   not acquired and are not held in connection with or as a participant in any   transaction having that purpose or effect.</font></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Signature</font></b></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. </font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">February 13, 2012</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;"><br>   /s/Joanna Haigney</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Signature</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;"><br>   Joanna Haigney<br>   Senior Vice President and Chief Compliance Officer</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name/Title</font></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">&nbsp;</font></i></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5<a name="PB_5_081420_2897"></a></font></p>
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