By the way - if you inherited MARPS - you inherit at the price on that day. If MARPS goes up, you will pay capital gains on the difference. Since MARPS has only recently traded above $32, chances are the person bought it at $20 or lower. You don't have to pay their capital gains. You might consider that, and even take a slight loss. Then you could take the loss (up to $3000 a year) off your taxes.
I presume you mean a private placement rather than selling on the open market? If you don't have more than 1000 shares, I would just put a limit order in at a price you want - Maybe $33? And wait for someone to fill it. MARPS was trading at $34 a few weeks ago. If you have a huge amount, you might contact some of the 5% owners (listed on Yahoo profile of MARPS) and see if they would buy. It might be in their interest to keep a large amount off the open market - if you tried to dump 10,000 shares, it would depress the price.