EXHIBIT 21 SUBSIDIARIES OF SAFEGUARD SCIENTIFICS, INC. Exclusive of immaterial subsidiaries and companies in which Registrant holds a minority interest, Registrant as of March 20, 2002 had the following subsidiaries: PLACE OF NAME INCORPORATION Agari Mediaware, Inc. Delaware aligne incorporated Pennsylvania Aptas Inc. (formerly known as Nextron Communications, Inc.) California Bebob Associates Pennsylvania Bonfield 99 Capital, L.P. Delaware Bonfield 2000 Capital, L.P. Delaware Bonfield Fund Management, L.P. Delaware Bonfield Insurance, Ltd. British Virgin Islands Bonfield Partners Capital, L.P. Delaware CompuCom Systems, Inc. Delaware CompuShop Incorporated Delaware K Consultants, Inc. Pennsylvania Pacific Title and Arts Studio, Inc. Delaware PA-ESP Management, L.P. Delaware Palarco, Inc. Pennsylvania Penn-Sylvan Management, Inc. Pennsylvania Pennsylvania Early Stage Partners GP, LLC Pennsylvania Protura Wireless, Inc. Delaware Safeguard 97 Capital, L.P. Delaware Safeguard 98 Capital, L.P. Delaware Safeguard 99 Capital, L.P. Delaware Safeguard 2000 Capital, L.P. Delaware Safeguard 2001 Capital, L.P. Delaware Safeguard Capital Management, Inc. Delaware Safeguard Delaware, Inc. Delaware Safeguard Fund Administrative Services, Inc. Delaware Safeguard Fund Management, Inc. Delaware Safeguard Fund Management, L.P. Delaware Safeguard Partners Capital, L.P. Delaware Safeguard Scientifics (Delaware), Inc. Delaware Safeguard Technologies, Inc. Delaware SFINT, Inc. Delaware Sotas, Inc. Delaware SSI B, Inc. Delaware SSI Buttonwood, Inc. Delaware SSI Partnership Holdings, Inc. Delaware SSI Partnership Holdings (Pennsylvania), Inc. Pennsylvania Tangram Enterprise Solutions, Inc. Pennsylvania Technology Leaders Management, Inc. Delaware XL Realty Corp. Florida