Long/short investment strategies

 are implemented by Vanguard in the following funds:
 * Vanguard Market Neutral Fund
 * Vanguard Managed Payout Funds

S&P 500 130/30 strategy Index

 * Whitepaper:Introducing a Framework for 130/30 Indexation
 * Factsheet:The S&P 500 130/30 Strategy Index
 * Index Methodology