<PAGE> 1
Prospectus Supplement No. 9 Filed pursuant to Rule 424(b)(3)
to Prospectus dated March 6, 2000 Registration No. 333-31354
ALKERMES, INC.
$250,000,000 3 3/4% CONVERTIBLE SUBORDINATED NOTES DUE 2007
3,690,036 SHARES OF COMMON STOCK
This prospectus supplement supplements the information contained in the
prospectus of Alkermes, Inc. dated March 6, 2000, as supplemented by Prospectus
Supplement No. 1 dated March 10, 2000, Prospectus Supplement No. 2 dated March
17, 2000, Prospectus Supplement No. 3 dated March 24, 2000, Prospectus
Supplement No. 4 dated April 5, 2000, Prospectus Supplement No. 5 dated April
13, 2000, Prospectus Supplement No. 6 dated April 21, 2000, Prospectus
Supplement No. 7 dated May 4, 2000 and Prospectus Supplement No. 8 dated May 30,
2000, relating to the potential resale from time to time of the 3 3/4%
Convertible Subordinated Notes due 2007 of Alkermes and the resale of shares of
common stock of Alkermes issuable upon conversion of the notes. This prospectus
supplement is not complete without, and may not be delivered or utilized except
in connection with, the prospectus, including any amendments or supplements
thereto.
The following table supplements the information set forth in the prospectus
under the caption "Selling Securityholders" with respect to the selling
securityholders and the respective principal amount of notes which are
beneficially owned and may be sold by each selling securityholder, and the
number of shares of common stock that may be sold by the selling securityholders
pursuant to this prospectus, as amended or supplemented:
<TABLE>
<CAPTION>
Number of Shares of Common
Principal Amount of Notes Stock Issued Upon Conversion
Beneficially Owned and of the Notes that May be
Name of Selling Securityholder (1) Offered Offered (2)
<S> <C> <C>
Credit Suisse First Boston Corporation $1,375,000 20,295
</TABLE>
(1) The information set forth herein is as of June 21, 2000 and will be updated
as required.
(2) Assumes conversion of the full principal amount of the notes held by such
holder at the initial conversion price of $67.75 per share of common stock.
This prospectus supplement reflects the impact of the two-for-one split of
Alkermes' common stock effective April 28, 2000 on the shares of common
stock issuable upon conversion of the notes.
(6) The amount listed is an additional $1,375,000 principal amount of the notes
beneficially owned by the holder as of June 14, 2000.
THE DATE OF THIS PROSPECTUS SUPPLEMENT IS JUNE 21, 2000
