final double totalMarketCap = filteredTickers.stream().mapToDouble(ticker -> ticker.getMarketCapUSD().doubleValue()).sum();
double cappedRemaining = 1d;
double marketRemaining = 1d;
for (CoinMarketCapTicker ticker : filteredTickers) {
    double marketPercentage = ticker.getMarketCapUSD().doubleValue() / totalMarketCap;
    double uncappedPercentage = marketPercentage * cappedRemaining / marketRemaining;
    double cappedPercentage = Math.min(uncappedPercentage, _indexCap);

    _indexTickers.add(new IndexTicker(ticker, marketPercentage, cappedPercentage));

    marketRemaining -= marketPercentage;
    cappedRemaining -= cappedPercentage;
}