Discussing the article: "Constant Proportion Portfolio Insurance (CPPI) for MQL5: A Floor-Protected Capital Allocation Strategy"

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Check out the new article: Constant Proportion Portfolio Insurance (CPPI) for MQL5: A Floor-Protected Capital Allocation Strategy.

Build Constant Proportion Portfolio Insurance natively in MQL5. The article details the floor and cushion formulas, a rebalance engine that operates safely on both netting and hedging accounts, and a price‑only reference indicator that reuses the same math. A real Strategy Tester run on XAUUSD M5 demonstrates configuration, order sizing, and stability under a rebalance band.

Most Expert Advisors are built to answer one question: buy, sell, or wait. Constant Proportion Portfolio Insurance was never trying to answer that question. It asks something quieter and, in a way, more useful: given how much room is left above a floor you've promised yourself you won't cross, how much should actually be at risk right now? The idea comes out of 1980s portfolio insurance, originally built for pension funds and mutual funds that wanted a shot at equity gains without any real chance of ending up below a guaranteed value. The original theory wasn't written with MetaTrader 5, gold, or M5 charts in mind. Porting it into an EA means being explicit about what carries over and what does not.

The mechanics are almost suspiciously simple once you see them. You pick a floor, the lowest your account is ever allowed to be worth. Everything above that floor is the cushion, and a fixed multiplier turns the cushion into how much exposure the risky asset is allowed to have. When the cushion shrinks, exposure comes down with it. When it grows, exposure grows too. That's really the whole rule. No forecast, no indicator, no opinion about where gold is headed next week — just a running answer to "how much room do we have left."

One thing that rule doesn't do, worth naming up front: it's a long-only sizing model. CPPI decides how much of the risky asset to hold, not whether to go long or short — there's no mechanism here for expressing a bearish view. "No directional forecast" means it never bets on where price goes next, not that it's neutral about direction in its exposure.

Author: Adewumi Babatunde Gbadebo

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