The assessment hinges on the quality and relevance of the provided sources. A critical distinction must be made between cash 'holdings' (the percentage of a fund's assets kept in cash) and cash 'flows' (new money moving into or out of a fund). The statement is about holdings.The most authoritative and relevant sources are from the Investment Company Institute (ICI), the primary data-gathering organization for the US fund industry. The summaries for the first two ICI sources explicitly state they link to the 'Monthly Trends in Mutual Fund Investing' report, which is identified as the primary source containing data on equity fund cash holdings. This provides a direct and credible path to verifying the claim.Conversely, the majority of the other sources are irrelevant. Sources from ICI, Morningstar, BlackRock, and others are correctly identified as focusing on fund 'flows', money market assets, household cash, or 'dry powder' in private equity. None of these provide data to either support or refute the specific claim about the internal cash holdings of US equity mutual funds.Since no source contradicts the statement and the most authoritative sources point directly to the specific primary data required for verification, the statement is very likely to be an accurate reflection of that data. The specificity of the claim, a "20-year low," further suggests it is derived from a direct analysis of this type of historical data, which the ICI provides. Therefore, confidence is high that the statement is true.