The investor's conversion price is reduced, and thus the number of common shares received on conversion increased, in the case of a down round; it takes into account both: (a) the reduced price and, (b) how many shares (or rights) are issued in the dilutive financing.
The equation is:
CP2 = CP1 * (A+B) / (A+C), where:
CP2 = New Series A Conversion Price
CP1 = Series A Conversion Price in effect immediately prior to new issue
A = Number of shares of Common Stock deemed to be outstanding immediately prior to new issue (includes all shares of outstanding common stock, all shares of outstanding preferred stock on an as-converted basis, and all outstanding options on an as-exercised basis; and does not include any convertible securities converting into this round of financing)
B = Aggregate consideration received by the Corporation with respect to the new issue divided by CP1
C = Number of shares of stock issued in the subject transaction