How does portable alpha work when you use index futures to transport alpha?

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AcadiFi · Accepted Answer

Portable alpha separates the alpha source (a market-neutral strategy) from the beta source (a cheap index overlay) so you can add manager skill without changing asset-class exposure. Mechanics on a $500M allocation. Step one: invest $500M in a market-neutral hedge fund, Harborfell Capital, targeting 5% annual alpha above cash (SOFR) with 4% volatility and beta near zero. Step two: layer S&P 500 exposure via futures on top. E-mini S&P 500 contracts notionally $280k each at index 5,600; buy $500M / $280k = 1,786 contracts. Post margin (6% = $30M) from liquid Treasuries. Economics: your total return = SOFR + 5% (alpha) - 10 bps (futures roll cost) + S&P 500 excess return. If S&P returns 10% and SOFR is 4.5%, total ≈ 14.9% vs 10% from plain index. Risks and considerations. First, leverage: you're holding $500M cash in the hedge fund AND $500M S&P futures notional, so gross exposure is 200%. Second, basis risk from futures roll (negative 5-15 bps annually). Third, margin calls on futures losses require liquidity; maintain 15-20% cash buffer. Fourth, alpha correlation: if Harborfell's 'market-neutral' beta drifts to 0.25, you'll be overexposed to equities on sell-offs. Monitor realized beta monthly. Fifth, counterparty risk on swap-based overlays. Typical institutional setup: custodian segregates futures margin, prime broker finances hedge fund, and overlay manager rebalances quarterly. Portable alpha improves Sharpe ratio when the hedge fund's information ratio exceeds 0.5.

How does portable alpha work when you use index futures to transport alpha?

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