X0101 EFFECT 33 LIVE 2013-01-18 16:15:00

N-14

0000898031 LORD ABBETT SECURITIES TRUST 333-185183 0000898031 LORD ABBETT SECURITIES TRUST S000032915 Lord Abbett Growth Leaders Fund C000101588 Class A 0001095664 LORD ABBETT STOCK APPRECIATION FUND S000006868 LORD ABBETT STOCK APPRECIATION FUND C000018558 Class A 0000898031 LORD ABBETT SECURITIES TRUST S000032915 Lord Abbett Growth Leaders Fund C000101589 Class C 0001095664 LORD ABBETT STOCK APPRECIATION FUND S000006868 LORD ABBETT STOCK APPRECIATION FUND C000018560 Class C 0000898031 LORD ABBETT SECURITIES TRUST S000032915 Lord Abbett Growth Leaders Fund C000101590 Class F 0001095664 LORD ABBETT STOCK APPRECIATION FUND S000006868 LORD ABBETT STOCK APPRECIATION FUND C000054852 Class F 0000898031 LORD ABBETT SECURITIES TRUST S000032915 Lord Abbett Growth Leaders Fund C000101591 Class I 0001095664 LORD ABBETT STOCK APPRECIATION FUND S000006868 LORD ABBETT STOCK APPRECIATION FUND C000018562 Class I 0000898031 LORD ABBETT SECURITIES TRUST S000032915 Lord Abbett Growth Leaders Fund C000101592 Class R2 0001095664 LORD ABBETT STOCK APPRECIATION FUND S000006868 LORD ABBETT STOCK APPRECIATION FUND C000054853 Class R2 0000898031 LORD ABBETT SECURITIES TRUST S000032915 Lord Abbett Growth Leaders Fund C000101593 Class R3 0001095664 LORD ABBETT STOCK APPRECIATION FUND S000006868 LORD ABBETT STOCK APPRECIATION FUND C000054854 Class R3 0000898031 LORD ABBETT SECURITIES TRUST S000032915 Lord Abbett Growth Leaders Fund C000120794 Class B 0001095664 LORD ABBETT STOCK APPRECIATION FUND S000006868 LORD ABBETT STOCK APPRECIATION FUND C000018559 Class B