X0306 4 2013-03-14 0 0000726514 ELECTRO SCIENTIFIC INDUSTRIES INC ESIO 0001282683 Nierenberg Investment Management Company, Inc. 19605 NE 8TH STREET CAMAS WA 98607 1 0 1 0 0001040899 Nierenberg David 19605 NE 8TH STREET CAMAS WA 98607 0 0 1 0 0001365745 D3 Family Bulldog Fund, LP 19605 NE 8TH STREET CAMAS WA 98607 0 0 1 0 Common Stock 2013-03-14 4 A 0 28.0841 0 A 2037271 I By The D3 Family Bulldog Fund, LP Common Stock 555300 I By The D3 Family Fund, LP Common Stock 182227 I By The D3 Family Canadian Fund, LP Common Stock 402831 I By The DIII Offshore Fund, LP Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of the reporting person's pecuniary interest therein. These awards result from dividend equivalents pursuant to the underlying RSU agreements. David Nierenberg 2013-03-15 David Nierenberg, President, Nierenberg Investment Management Company, Inc. (NIMCO) 2013-03-15 David Nierenberg, President, NIMCO, General Partner of The D3 Family Bulldog Fund, LP 2013-03-15