X0202 3 2007-02-08 0 0001384358 OLD MUTUAL 2100 ABSOLUTE RETURN INSTITUTIONAL FUND, LLC NONE 0000796370 OLD MUTUAL (US) HOLDINGS INC. 200 CLARENDON STREET, 53RD FLOOR BOSTON MA 02116 0 0 0 1 See Remarks Limited Liability Company Interests 100000 D This filing is made on behalf of Old Mutual (US) Holdings, Inc., the parent of 2100 Larch Lane LLC, the Issuer's investment adviser. The Investment Management Agreement of the Issuer is dated February 8, 2007. The Reporting Person made a seed investment of $100,000 in the Issuer. /s/ John M. Grady 2007-02-20