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Unlike traditional models, our approach explicitly treats the returns of newly added stocks as uncertain variables, estimated based on expert judgment. The proposed model is formulated as a constrained nonlinear optimization problem and solved using the \u201cfmincon\u201d function in MATLAB R2018a. A numerical example demonstrates the practical applicability of our model, and a comparative analysis highlights its advantages over existing portfolio optimization methods. The results show that our approach provides a more flexible and realistic framework for portfolio adjustments, particularly in uncertain financial environments.<\/jats:p>","DOI":"10.1142\/s0218488526500042","type":"journal-article","created":{"date-parts":[[2025,12,24]],"date-time":"2025-12-24T05:26:51Z","timestamp":1766554011000},"page":"69-89","source":"Crossref","is-referenced-by-count":0,"title":["Portfolio Adjusting Model with Newly Listed Stocks Using Uncertainty Theory"],"prefix":"10.1142","volume":"34","author":[{"given":"Sanjoy","family":"Chhatri","sequence":"first","affiliation":[{"name":"Department of Mathematics, National Institute of Technology Agartala, Agartala, Tripura-799046, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Susanta","family":"Banik","sequence":"additional","affiliation":[{"name":"Department of Mathematics, Holy Cross College, Agartala, Tripura-799210, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Debasish","family":"Bhattacharya","sequence":"additional","affiliation":[{"name":"Department of Mathematics, National Institute of Technology Agartala, Agartala, Tripura-799046, India"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"219","published-online":{"date-parts":[[2025,12,24]]},"reference":[{"key":"S0218488526500042BIB001","doi-asserted-by":"publisher","DOI":"10.2307\/2975974"},{"key":"S0218488526500042BIB002","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-540-73165-8_5"},{"key":"S0218488526500042BIB003","first-page":"232","volume":"13","author":"Chen X.","year":"2011","journal-title":"International Journal of Fuzzy Systems"},{"key":"S0218488526500042BIB004","doi-asserted-by":"publisher","DOI":"10.1142\/S0218488509005954"},{"key":"S0218488526500042BIB005","doi-asserted-by":"publisher","DOI":"10.1007\/s10700-012-9132-y"},{"key":"S0218488526500042BIB006","doi-asserted-by":"publisher","DOI":"10.1016\/j.mcm.2008.07.007"},{"key":"S0218488526500042BIB007","doi-asserted-by":"publisher","DOI":"10.1016\/j.insmatheco.2013.06.005"},{"key":"S0218488526500042BIB008","doi-asserted-by":"publisher","DOI":"10.1007\/s00500-012-0930-5"},{"key":"S0218488526500042BIB009","first-page":"163","volume":"4","author":"Liu B.","year":"2010","journal-title":"Journal of Uncertain Systems"},{"key":"S0218488526500042BIB010","doi-asserted-by":"publisher","DOI":"10.1016\/j.amc.2013.02.015"},{"key":"S0218488526500042BIB011","unstructured":"Z. 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