13F-HR 1 file13f33110.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 13F FORM 13F COVER PAGE Report for the Calendar Year or Quarter Ended: March 31, 2010 Check here if Amendment [ ]; Amendment Number: This Amendment (check only one.): [ ] is a restatement. [ ] adds new holdings entries. Institutional Investment Manager Filing this Report: Name: Peter K. Seldin Address: 575 Lexington Avenue, 33rd Floor New York, NY 10022 Form 13F File Number: 28-3604 The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists and tables, are considered integral parts of this form. Person signing this report on Behalf of Reporting Manager: Name: Peter K. Seldin Title: Investment Manager Phone: 212-753-5150 Signature, Place, and Date of Signing: /s/Peter K. Seldin New York, NY May 11, 2010 Report type (Check only one): [X] 13F Holdings Report. [ ] 13F Notice. [ ] 13F Combination Report. FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 3 Form 13F Information Table Entry Total: 17 Form 13F Information Table Value Total: $270,752 (thousands) List of Other Included Managers: Provide a numbered list of the name(s) and Form 13F file number(s) of all Institutional investment managers with respect to which this report is filed, other than the manager filing this report. No. Form 13F File Number Name 1. 028-12601 Centennial Energy Partners, L.L.C. 2. 028-12603 Centennial Energy Partners, L.P. 3. 028-12606 Centennial Energy Partners V, L.P. FORM 13F INFORMATION TABLE

COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 TITLE OF VALUE SHARES INVESTMENT OTHER VOTING AUTHORITY NAME OF ISSUER CLASS CUSIP (X $1000) PRN/AMT DISCRETION MANAGERS SOLE SHARED ATP OIL & GAS COM 00208J108 ~~42762~~44002 2,339,288 SHARED-DEFINED 1,2 2,339,288 0 ATP OIL & GAS COM 00208J108 ~~28243~~32166 1,~~545~~710,034 SHARED-DEFINED 1,3 1,~~545~~710,034 0 ATP OIL & GAS COM 00208J108 ~~6297~~6480 344,485 SHARED-DEFINED 1 344,485 0 BPZ RESOURCES INC COM 055639108 ~~41607~~36637 4,~~379~~984,674 SHARED-DEFINED 1,2 4,~~379~~984,674 0 BPZ RESOURCES INC COM 055639108 ~~44438~~35042 4,~~677~~767,656 SHARED-DEFINED 1,3 4,~~677~~767,656 0 BPZ RESOURCES INC COM 055639108 ~~5482~~5656 ~~577~~769,~~047~~547 SHARED-DEFINED 1 ~~577~~769,~~047~~547 0 CARRIZO OIL & GAS INC COM 144577103 ~~31575~~27334 1,191,043 SHARED-DEFINED 1,2 1,191,043 0 CARRIZO OIL & GAS INC COM 144577103 ~~26006~~22513 980,976 SHARED-DEFINED 1,3 980,976 0 CARRIZO OIL & GAS INC COM 144577103 ~~3758~~3253 141,750 SHARED-DEFINED 1 141,750 0 COMPTON PETE CORP. COM 204940100 ~~20100~~20537 21,847,828 SHARED-DEFINED 1,2 21,847,828 0 COMPTON PETE CORP. COM 204940100 ~~5965~~6095 6,483,832 SHARED-DEFINED 1,3 6,483,832 0 COMPTON PETE CORP. COM 204940100 ~~3302~~3374 3,589,235 SHARED-DEFINED 1 3,589,235 0 GMX RES INC COM 38011M108 ~~20847~~5764 1701,~~517,275~~200 SHARED-DEFINED 1,2 1701,~~517,275~~200 0 GMX RES INC COM 38011M108 ~~7943~~4752 578,101 SHARED-DEFINED 1,3 578,101 0 GMX RES INC COM 38011M108 ~~3005~~717 ~~218~~87,~~695~~176 SHARED-DEFINED 1 ~~218~~87,~~695~~176 0 RANGE RES CORP COM 75281A109 ~~8843~~8315 177,400 SHARED-DEFINED 1,3 177,400 0 SOUTHWESTERN ENERGY CO COM 845467109 ~~9606~~8115 199,300 SHARED-DEFINED 1,3 199,300 0

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