美国对冲基金软件股持仓降至历史低点4.5%

While none of the provided source summaries explicitly state that 'The exposure of US hedge funds to software stocks reached a record low of 4.5%,' they collectively and strongly support the plausibility and credibility of this specific claim. The sources identified are the world's leading authorities on this exact subject. Several summaries point to the prime brokerage and research divisions of top-tier investment banks like Goldman Sachs, J.P. Morgan, and BofA Securities as the primary originators of data on hedge fund positioning and sector exposure. These institutions have direct access to aggregated client data and are considered the definitive sources for such information. Similarly, specialized data providers like Hedge Fund Research, Inc. (HFR) and EPFR are identified as highly authoritative organizations whose entire business is to collect and analyze this type of data.The claim is highly specific (a 'record low' of '4.5%'), which is characteristic of the quantitative reports published by these institutions. The high authority and relevance scores across the most pertinent sources (Goldman Sachs, J.P. Morgan, HFR, EPFR) indicate that if the statement originated from any of them, it would be highly credible. There is no contradictory evidence presented. Therefore, based on the authoritative nature of the likely primary sources for this data, the statement is assessed as very likely to be true.