X0202 4 2008-01-08 0 0001364541 EAGLE ROCK ENERGY PARTNERS L P EROC 0000806085 LEHMAN BROTHERS HOLDINGS INC 745 SEVENTH AVENUE NEW YORK NY 10019 0 0 1 0 Common Units 2008-01-08 4 S 0 1200 17.75 D 7605098 I See Footnote Common Units 2008-01-08 4 S 0 300 17.76 D 7604798 I See Footnote Common Units 2008-01-08 4 S 0 200 17.7875 D 7604598 I See Footnote Common Units 2008-01-08 4 S 0 400 17.79 D 7604198 I See Footnote Common Units 2008-01-08 4 S 0 600 17.8 D 7603598 I See Footnote Common Units 2008-01-08 4 S 0 300 17.8075 D 7603298 I See Footnote Common Units 2008-01-08 4 S 0 100 17.81 D 7603198 I See Footnote Common Units 2008-01-08 4 S 0 600 17.82 D 7602598 I See Footnote Common Units 2008-01-08 4 S 0 500 17.83 D 7602098 I See Footnote Common Units 2008-01-08 4 S 0 200 17.835 D 7601898 I See Footnote Common Units 2008-01-08 4 S 0 900 17.86 D 7600998 I See Footnote Common Units 2008-01-08 4 S 0 300 17.87 D 7600698 I See Footnote Common Units 2008-01-08 4 S 0 300 17.88 D 7600398 I See Footnote Common Units 2008-01-08 4 S 0 200 17.89 D 7600198 I See Footnote Common Units 2008-01-08 4 S 0 500 17.895 D 7599698 I See Footnote Common Units 2008-01-08 4 S 0 100 17.8975 D 7599598 I See Footnote Common Units 2008-01-08 4 S 0 700 17.9 D 7598898 I See Footnote Common Units 2008-01-08 4 S 0 100 17.905 D 7598798 I See Footnote Common Units 2008-01-08 4 S 0 400 17.9075 D 7598398 I See Footnote Common Units 2008-01-08 4 S 0 2400 17.91 D 7595998 I See Footnote Common Units 2008-01-08 4 S 0 1200 17.92 D 7594798 I See Footnote Common Units 2008-01-08 4 S 0 400 17.925 D 7594398 I See Footnote Common Units 2008-01-08 4 S 0 300 17.9275 D 7594098 I See Footnote Common Units 2008-01-08 4 S 0 200 17.93 D 7593898 I See Footnote Common Units 2008-01-08 4 S 0 400 17.9375 D 7593498 I See Footnote Common Units 2008-01-08 4 S 0 1900 17.94 D 7591598 I See Footnote Common Units 2008-01-08 4 S 0 1100 17.9475 D 7590498 I See Footnote Common Units 2008-01-08 4 S 0 1710 17.95 D 7588788 I See Footnote Common Units 2008-01-08 4 S 0 800 17.96 D 7587988 I See Footnote Common Units 2008-01-08 4 S 0 100 17.9625 D 7587888 I See Footnote By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,633,046 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,632,746 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,632,546 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,632,146 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,631,546 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,631,246 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,631,146 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,630,546 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,630,046 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,629,846 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,628,946 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,628,646 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,628,346 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,628,146 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,627,646 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,627,546 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,626,846 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,626,746 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,626,346 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,623,946 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,622,746 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,622,346 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,622,046 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,621,846 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,621,446 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,619,546 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,618,446 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,616,736 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,615,936 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP By direct and indirect, wholly-owned subsidiaries of the Reporting Person: 2,615,836 common units held by Lehman Brothers Inc.; 3,590,859 common units held by Lehman Brothers MLP Opportunity Fund LP; and 1,381,193 common units held by Lehman Brothers MLP Partners, LP Because the SEC's electronic filing system does not allow for the disclosure of more than 30 transactions on one Form 4, the Reporting Persons are filing three simultaneous Forms 4 to report their reportable transactions, all of which together shall be deemed a single report filed on this date. This is the first Form 4 of the three filings. JOINT FILER INFORMATION: Title of Derivative Securities: Common Units Issuer & Ticker Symbol: Eagle Rock Energy Partners L P (EROC) Designated Filer: Lehman Brothers Holdings Inc., 745 Seventh Avenue New York, NY 10019 Other Joint Filer Information: Lehman Brothers Inc. 745 Seventh Avenue, New York, NY 10019, a Delaware corporation, a direct wholly-owned subsidiary of the Reporting Person. LB I Group Inc., 399 Park Avenue, New York NY 10022, a Delaware corporation, a direct wholly-owned subsidiary of Lehman Brothers Inc. Lehman Brothers MLP Opportunity Associates LLC, 399 Park Avenue, New York, NY 10022, a Delaware limited liability company, a direct wholly-owned subsidiary of the Reporting Person and general partner of Lehman Brothers MLP Opportunity Associates LP. Lehman Brothers MLP Opportunity Associates LP, 399 Park Avenue, New York, NY 10022, a Delaware limited partnership, and general partner of Lehman Brothers MLP Opportunity Fund LP. Lehman Brothers MLP Opportunity Fund LP, 399 Park Avenue, New York, NY 10022 a Delaware limited partnership. Lehman Brothers MLP Associates, LP, 399 Park Avenue New York, NY 10022, a Delaware limited partnership, wholly-owned by LB I Group Inc. Lehman Brothers MLP Partners, LP, 399 Park Avenue, New York, NY 10022 a Delaware limited partnership, wholly-owned by Lehman Brothers MLP Associates, LP. /s/ Barrett S. DiPaolo 2008-01-10