	investment firm boosts purolator pcc stake halcyon investments a new york investment partnership that deals mainly in risk arbitrage and stock trading said it raised its purolator courier corp stake to shares or pct from or pct in a filing with the securities and exchange commission halcyon whose managing partner is alan b slifka and co said it bought purolator common shares between feb and march at prices ranging from to dlrs each halcyon which said it has spent mln dlrs for its purolator common shares said it also uired options on feb giving it the right to buy shares for mln dlrs reuter 
