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We target US stocks from S&amp;P 500 index only during regular trading hours. Essentially, we propose a new performance ratio, which divides an asset\u2019s return by its intraday uncertainty expressed by entropy. The portfolio is created applying an equal-weighted portfolio concept to achieve a balanced allocation. Furthermore, we evaluate portfolio performance statistics to assess risk-return profiles, volatility, and other relevant metrics, considering investments only during regular trading hours. We demonstrate that portfolios constructed using the proposed method exhibit an improvement in ex-post wealth paths compared to benchmarks. To ensure the robustness of our approach, we analyze the impact of different entropy computation settings, assess the marginal contribution of preselected assets, and test the performance.<\/jats:p>","DOI":"10.1007\/s10614-026-11347-2","type":"journal-article","created":{"date-parts":[[2026,4,9]],"date-time":"2026-04-09T07:04:31Z","timestamp":1775718271000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Applicability of Intraday Entropy for Trading During Regular Market Hours"],"prefix":"10.1007","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1960-8318","authenticated-orcid":false,"given":"David","family":"Ned\u011bla","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8621-3493","authenticated-orcid":false,"given":"Ale\u0161","family":"Kresta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,4,9]]},"reference":[{"issue":"4","key":"11347_CR1","doi-asserted-by":"publisher","first-page":"592","DOI":"10.1016\/j.ijforecast.2013.03.006","volume":"29","author":"K Ahoniemi","year":"2013","unstructured":"Ahoniemi, K., & Lanne, M. 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