Exhibit 99.7 FORM OF WARRANT THIS WARRANT AND THE WARRANT SHARES SHALL NOT BE SOLD OR TRANSFERRED EXCEPT (A) IN ACCORDANCE WITH THE PROVISIONS OF REGULATION S UNDER THE SECURITIES ACT OF 1933, (B) PURSUANT TO REGISTRATION UNDER THE SECURITIES ACT OF...Warrant Agreement • October 8th, 2004 • Zein Youssef El • Biological products, (no disgnostic substances) • Delaware
ANDManagement Agreement • September 8th, 2003 • Zein Youssef El • Biological products, (no disgnostic substances) • Isle of Man
Exhibit 1Agreement • September 8th, 2003 • Zein Youssef El • Biological products, (no disgnostic substances)
After reasonable inquiry and to the best of the knowledge and belief of the undersigned, the undersigned hereby agree that only one statement containing the information required by Schedule 13D need be filed with respect to the ownership by each of the undersigned of the shares of common stock of Hybridon, Inc.
Where: X = the number of Warrant Shares that shall be issued to the Registered Holder; Y = the number of Warrant Shares for which this Warrant is being exercised (which shall include both the number of Warrant Shares issued to the Registered Holder...Warrant Agreement • September 8th, 2003 • Zein Youssef El • Biological products, (no disgnostic substances) • Delaware
Exhibit 6 HYBRIDON, INC. REGISTRATION RIGHTS AGREEMENT dated as of August 28, 2003 HYBRIDON, INC. REGISTRATION RIGHTS AGREEMENT This Registration Rights Agreement (this "Agreement") is entered into as of August 28, 2003 by and among Hybridon, Inc., a...Registration Rights Agreement • September 8th, 2003 • Zein Youssef El • Biological products, (no disgnostic substances) • Delaware
HYBRIDON, INC.Registration Rights Agreement • October 8th, 2004 • Zein Youssef El • Biological products, (no disgnostic substances) • Delaware
Exhibit 99.4 SUBSCRIPTION AGREEMENT (Non-U.S. Investor) 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...Subscription Agreement • October 8th, 2004 • Zein Youssef El • Biological products, (no disgnostic substances) • Massachusetts
