The evidence from the provided sources strongly supports both components of the statement: that technology firms' capital expenditure (capex) is at a record level and that it constitutes a very large portion of the S&P 500's total capex.First, the 'record' aspect of the claim is directly supported by a highly relevant source. The TIAA report explicitly states that 'Hyperscaler capital expenditure has reached historic levels,' directly corroborating that the spending is at a record high. The Forbes article, by identifying 'AI Capex' as a major market force, also points to an unprecedented surge in this area.Second, while no source explicitly repeats the exact '45%' figure, the provided data makes this percentage highly plausible. The J.P. Morgan commentary quantifies the scale of tech giant spending at a projected '$500 billion annually.' This massive figure for the numerator (tech capex) strongly suggests it would represent a historically large share of the total S&P 500 capex. The most critical piece of evidence is the Ned Davis Research weekly briefing. With the highest authority and relevance scores, its summary indicates it 'explicitly analyzes S&P 500 sector data, including a mention of sectors growing their capex.' A detailed report of this nature from a primary data source is the most probable origin for a specific and record-breaking statistic like 45%.Furthermore, there is no conflicting evidence among the sources. The lower-relevance sources are dismissed because they discuss different metrics like market capitalization or earnings per share, not capital expenditure. The convergence of multiple high-authority sources pointing to massive, record-breaking spending by the tech sector provides a high degree of confidence in the statement's accuracy.