- ›The top 7 mega-cap tech stocks account for roughly 30% of S&P 500 index movement; broad index trading is heavily tech-correlated.
- ›CFD contracts charge overnight financing fees (SOFR + broker spread); long positions held for months suffer continuous yield decay.
- ›Dividend adjustments: Long CFD holders receive dividend credits; short CFD holders have dividend deductions deducted on ex-dividend dates.
Trading an S&P 500 CFD does not provide exposure to 500 evenly balanced American companies. Because the index uses market-capitalization weighting, the seven largest technology corporations dictate approximately 30% of every point movement. When trading index derivatives, macro earnings from this small basket carry vastly greater weight than the remaining constituent companies combined.
Overnight Financing Swaps
CFDs are margined contracts that involve borrowed capital. When holding a long S&P 500 CFD position past daily roll cutoff (typically 22:00 GMT), the broker levies an overnight financing charge. This charge is calculated using the benchmark rate (such as US SOFR) plus a broker fee margin (typically 2.5% to 3.5% annually). Holding a geared long index CFD for six months can erode 4% to 5% of position value purely in financing interest.
Dividend Adjustments Explained
When an constituent company within the index trades ex-dividend, its share price drops by the dividend value, mechanically pulling down the index level. To maintain parity, brokers credit long CFD account holders with the dividend cash equivalent and debit short CFD account holders by the identical amount.
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