The assessment is "likely_true" because the core substance of the claim is strongly supported by the most authoritative and relevant sources. The Bloomberg article, a premier financial news source with the highest relevance score, directly reports a "surge" and a "jump" in new retail accounts in China for January, specifying a high number of 4.9 million. This confirms that a very significant increase, as implied by the 88% figure, did occur. Furthermore, official Chinese media outlets like the People's Daily and Economic Daily corroborate that the China Securities Depository and Clearing Corp. (CSDC) is the official source for this data, lending high credibility to the reported event.While none of the provided sources explicitly state the "88%" figure, this percentage is quantitatively consistent with the qualitative descriptions of a major market event. The Bain & Company press release, which mentions "88%" in an unrelated context, introduces some doubt and suggests a potential for misattribution, but it does not directly contradict or disprove the claim about investor accounts. Given that the underlying event—a massive increase in investor accounts—is verifiably true based on top-tier evidence, the statement is assessed as likely true. The high-quality evidence supporting the substance of the claim outweighs the lack of direct confirmation for the specific percentage in the provided summaries.