ࡱ>  l \pThe Free Software Foundation B=PF0*8X@"1 Helvetica1Courier1 Courier New1 Courier New1 Helvetica$#,##0_);($#,##0)$#,##0_);[Red]($#,##0)$#,##0.00_);($#,##0.00)$#,##0.00_);[Red]($#,##0.00)-**_($* #,##0_);_($* (#,##0);_($* "-"_);_(@_)*)'_(* #,##0_);_(* (#,##0);_(* "-"_);_(@_)5,2_($* #,##0.00_);_($* (#,##0.00);_($* "-"??_);_(@_)2+/_(* #,##0.00_);_(* (#,##0.00);_(* "-"??_);_(@_)2$#,##0.00;[Red]$#,##0.003$#,##0.00;[Red]($#,##0.00)4$#,##0;[Red]($#,##00)50.00%;[Red](0.00%)6 0%;[Red](0%)7#,##0.00;[Red](#,##0.00)8#,##0;[Red](#,##0)                + ) , *   Ј ~~ ؈ ~~#؈ ~~"؈ ~~ ؈ ~~8#܈ ~~83ffff̙̙3f3fff3f3f33333f33*ACCOUNTING FIRMACCOUNTING FIRM (1)ACCOUNTING FIRM (2)&ACCOUNTING FIRM (3) l  . dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??ACCOUNTING FIRM (1)ACCOUNTING FIRM (2)ACCOUNTING FIRM (3)U } 7} <}  .    $PIONEER NATURAL RESOURCES CO 11-K 06/28/2006ACCOUNTING FIRM     December 31,    2005 2004"Investments at fair value:  Vanguard PRIMECAP Fund~  ~ &`" Vanguard Windsor II Fund~ (~ M! Vanguard 500 Index Fund~ b z~ "**" Vanguard Prime Money Market Fund~ l~ Z+# Vanguard Retirement Savings Trust~ z~ !,$ Vanguard International Growth Fund~ ~ v  Vanguard Explorer Fund~ 2~ 3+ Vanguard Short-Term Investment-Grade Fund~ V2S~ Nw/' Vanguard Total Bond Market Index Fund~ VM%~ ( Vanguard Asset Allocation Fund~ U ~ 6. Vanguard Inflation-Protected Securities Fund~ ~ f Sarofim Equity Fund~ ~  Pioneer Stock Fund~ .o~ XDls[C+{oc=z0Yo !"#$%&'()*+,- ~ NZ\"~ 9%!Participants loans receivable~ !f~ !*"""#~ #"~ #ʸ $Contributions receivable~ $~ $3%+Unallocated accrued administrative expenses~ %Q~ %:&&&+'# Net assets available for benefits~ 'a"~ '((()*$+____________________________1,)Created by Morningstar Document Research.0-(http://documentresearch.morningstar.com/ oGE! =PF0*8X> @--,,++ l  )7` dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??ACCOUNTING FIRMACCOUNTING FIRM (2)ACCOUNTING FIRM (3)U } >} y )    $PIONEER NATURAL RESOURCES CO 11-K 06/28/2006ACCOUNTING FIRM   7 /Additions to net assets available for benefits:& Interest and dividend income~ ^-  Employer contributions~ ^% Participants' contributions~ rĵ7/ Net appreciation in fair value of investments~ :`t Rollovers~ Z! Other income~ ~ zs:2Deductions from net assets available for benefits:' Distributions to participants~ >! Administrative expenses~ #~ ZC91Net increase in net assets available for benefits~ "0<4Net assets available for benefits, beginning of year~ Dlsg[OC7[{={0 !"#$%&'(  !6".Net assets available for benefits, end of year~ "a"##$%$&____________________________1')Created by Morningstar Document Research.0((http://documentresearch.morningstar.com/|pd<=PF0*8X> @((''&& l  % dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??ACCOUNTING FIRMACCOUNTING FIRM (1)ACCOUNTING FIRM (3)U } 6 Net appreciation in fair value of investments~ :`t$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/0Hsg[OC1=PF0*8X> @ l  ;1: dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??ACCOUNTING FIRMACCOUNTING FIRM (1)ACCOUNTING FIRM (2)U } } 6} 0}  ;    $PIONEER NATURAL RESOURCES CO 11-K 06/28/2006ACCOUNTING FIRM   (c)   Description of  (b) investment including  Identity of issuer, maturity date, rate of (e)borrower, lessor,!interest, collateral, parCurrent (a)or similar partyor maturity valueValue  *( Vanguard Fiduciary Trust Company Vanguard PRIMECAP Fund -522,000 shares~    *( Vanguard Fiduciary Trust Company"Vanguard Windsor II Fund -690,787 shares~ (  *( Vanguard Fiduciary Trust Company!Vanguard 500 Index Fund -163,390 shares~ b z  *( Vanguard Fiduciary Trust Company*"Vanguard Prime Money Market Fund -10,167,173 shares~ l  *( Vanguard Fiduciary Trust Company+#Vanguard Retirement Savings Trust -7,341,854 shares~ z  *( Vanguard Fiduciary Trust Company,$Vanguard International Growth Fund -332,299 shares~   *( Vanguard Fiduciary Trust Company Vanguard Explorer Fund -92,697 shares~ 2D l[7r7z! ^]qZ !"#$%&'()*+,-./0123456789:  *(  Vanguard Fiduciary Trust Company, $Vanguard Short-Term Investment-Grade!!!Fund - 528,772 shares~ !V2S " *(" Vanguard Fiduciary Trust Company/"'Vanguard Total Bond Market Index Fund -###477,680 shares~ #VM% $ *($ Vanguard Fiduciary Trust Company($ Vanguard Asset Allocation Fund -%%%171,625 shares~ %U  & *(& Vanguard Fiduciary Trust Company/&'Vanguard Inflation-Protected Securities'''Fund - 273,588 shares~ ' ( *(Fayez Sarofim & Co.(Sarofim Equity Fund -)))218,196 shares~ ) * *)*!Pioneer Natural Resources Company**"Pioneer Stock Fund - 462,386 units~ *.o + *%+Participants loans receivable/+'Interest rates range from 5.0% to 10.5%~ +f,,,,-...~ ."////0112 *Party-in-i2*Party-in-interest34 Note: Colum54-Column (d) is not applicable since all invest#4investments are participant5 direc5 directed.67$8____________________________19)Created by Morningstar Document Research.0:(http://documentresearch.morningstar.com/:N9D=V&J=PF0*8X> @::9988 Root Entry FBook  4;