Exhibit 99.6 SUBSCRIPTION AGREEMENT Hybridon, Inc. 345 Vassar Street Cambridge, MA 02139 Gentlemen: 1. Subscription. The undersigned (the "Purchaser"), intending to be legally bound, hereby irrevocably agrees to purchase from Hybridon, Inc. (the...Subscription Agreement • June 30th, 2005 • Hybridon Inc • Biological products, (no disgnostic substances) • Massachusetts
FORM OF HOME DIRECTOR, INC. SUBSCRIPTION AGREEMENTSubscription Agreement • August 16th, 2004 • Home Director Inc • Communications equipment, nec • New York