{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T08:41:03Z","timestamp":1792485663702,"version":"4.5.0"},"posted":{"date-parts":[[2026]]},"group-title":"SSRN","reference-count":0,"publisher":"Elsevier BV","license":[{"start":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T00:00:00Z","timestamp":1767225600000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.uspto.gov\/ip-policy\/copyright-policy\/copyright-basics"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>&lt;p&gt;Do stock returns follow a schedule, or does each day depend on the days before it? This paper treats these as two separate questions and tests both on the Nifty 500, using 4,955 daily returns from July 2006 to July 2026. We test seasonality, a pattern tied to position in a repeating cycle of trading days, across 25 cycle lengths using a generalised seasonality test that pools p-values to avoid false discoveries. Sequential dependence, where today's return depends on past returns, is tested with variance-ratio and Chow\u2013Denning tests, with a runs test and an ARCH-LM test as supplementary checks. No seasonality is found at any cycle length, in the full sample or in any of the four five-year sub-periods. Sequential dependence is significant in 2006\u201316, consistent with momentum, but the variance-ratio tests no longer detect it in 2016\u201326, a change that coincides with the growth of algorithmic trading on the National Stock Exchange but cannot be attributed to it. Volatility clustering persists throughout and offers no directional signal. The results are consistent with weak-form efficiency in the later period but not the earlier one.&lt;\/p&gt;<\/jats:p>","DOI":"10.2139\/ssrn.7629040","type":"posted-content","created":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T08:23:02Z","timestamp":1792484582000},"source":"Crossref","is-referenced-by-count":0,"title":["Persistence of Seasonal and Sequential Predictability in the Nifty 500: Evidence from 2006 to 2026"],"prefix":"10.2139","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-6727-3658","authenticated-orcid":true,"given":"Keanu","family":"Lopez","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deeksha","family":"Raju","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"V V","family":"Vaishnavi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","container-title":[],"original-title":[],"deposited":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T08:23:02Z","timestamp":1792484582000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.ssrn.com\/abstract=7629040"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026]]},"references-count":0,"URL":"https:\/\/doi.org\/10.2139\/ssrn.7629040","relation":{},"subject":[],"published":{"date-parts":[[2026]]},"subtype":"preprint"}}