X0201 3 2003-10-09 1 0001160241 DIGITALNET HOLDINGS INC DNET 0001262806 GTCR CO INVEST LP 6100 SEARS TOWER CHICAGO IL 60606 0 0 1 0 0001105021 GTCR GOLDER RAUNER LLC 6100 SEARS TOWER CHICAGO IL 60606 0 0 1 0 Common Stock, par value $.001 per share 39968 D See Footnote Class A Preferred Stock, par value $.01 per share 2003-10-09 2003-10-16 Common Stock 32975 D See Footnote GTCR Co-Invest, L.P., a limited partnership ("Co-Invest") is the direct beneficial owner of the shares reported in Tables I and II. GTCR Golder Rauner, L.L.C. is the general partner of Co-Invest. As such, GTCR Golder Rauner, L.L.C. may be deemed to be a beneficial owner of such securities. GTCR Golder Rauner, L.L.C. expressly disclaims beneficial ownership of the shares reported in Table I. The filing of this form shall not be deemed an admission that GTCR Golder Rauner, L.L.C. is, for Section 16 purposes or otherwise, the beneficial owner of such shares. Each share of Class A Preferred Stock is convertible into the number of shares of Common Stock obtained by dividing (1) the sum of (a) $1,000 and (b) any accrued and unpaid dividends by (2) the per share IPO price of the Common Stock of $17.00. The calculation setforth herein was determined using accrued and unpaid dividends as of September 30, 2003 and excludes additional shares issuable in respect of Preferred Stock dividends accrued and upaid after that date. /s/ Amit Mehta under a Power of Attorney attached hereto 2003-10-09