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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">finance</journal-id><journal-title-group><journal-title xml:lang="ru">Финансы: теория и практика/Finance: Theory and Practice</journal-title><trans-title-group xml:lang="en"><trans-title>Finance: Theory and Practice</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2587-5671</issn><issn pub-type="epub">2587-7089</issn><publisher><publisher-name>Financial University under The Government of Russian Federation</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26794/2587-5671-2025-29-3-59-71</article-id><article-id custom-type="elpub" pub-id-type="custom">finance-3682</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФОНДОВЫЕ РЫНКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>STOCK MARKETS</subject></subj-group></article-categories><title-group><article-title>Расшифровка феномена Nifty50 с помощью ANN: FIIs, DIIs и магия рынка</article-title><trans-title-group xml:lang="en"><trans-title>Decoding the Nifty50 Puzzle with ANN: FIIs, DIIs and Market Magic</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5606-9846</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сет</surname><given-names>Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Seth</surname><given-names>N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Неха Сет — PhD, доцент, Школа исследований в области менеджмента</p><p>Нью-Дели</p></bio><bio xml:lang="en"><p>Neha Seth — PhD, Assoc. Prof., School of Management Studies</p><p>New Delhi</p></bio><email xlink:type="simple">neha_seth01@yahoo.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7368-6141</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сиддики</surname><given-names>С.</given-names></name><name name-style="western" xml:lang="en"><surname>Siddiqui</surname><given-names>S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Саиф Сиддики — PhD, профессор, кафедра менеджмента</p><p>Нью-Дели</p></bio><bio xml:lang="en"><p>Saif Siddiqui — PhD, Prof., Department of Management Studies</p><p>New Delhi</p></bio><email xlink:type="simple">drsaifsiddiqui@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный открытый университет имени Индиры Ганди</institution><country>Индия</country></aff><aff xml:lang="en"><institution>Indira Gandhi National Open University</institution><country>India</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Джамиа Миллиа Исламиа</institution><country>Индия</country></aff><aff xml:lang="en"><institution>Jamia Millia Islamia</institution><country>India</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>18</day><month>06</month><year>2025</year></pub-date><volume>29</volume><issue>3</issue><fpage>59</fpage><lpage>71</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Сет Н., Сиддики С., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Сет Н., Сиддики С.</copyright-holder><copyright-holder xml:lang="en">Seth N., Siddiqui S.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://financetp.fa.ru/jour/article/view/3682">https://financetp.fa.ru/jour/article/view/3682</self-uri><abstract><p>В условиях динамичного и высококонкурентного финансового рынка понимание поведения различных категорий инвесторов становится ключевым фактором для разработки эффективных стратегий инвестирования и прогнозирования рыночных тенденций. В данном исследовании рассматривается феномен Nifty50 — группы из 50 наиболее ликвидных и значимых акций на индийском фондовом рынке, которые играют важную роль в формировании общего индекса. Цель исследования — определить влияние иностранных (FIIs) и отечественных (DIIs) институциональных инвесторов на динамику Nifty50. Авторы применяют классические методы исследования: корреляционный анализ, статистическую модель для анализа и прогнозирования изменчивости (волатильности) временных рядов (GARCH), искусственные нейросети (ANN). Исследование построено на основе ежедневных данных по инвестициям указанных двух групп инвесторов и  значений индекса Nifty50 Национальной фондовой биржи. Период исследования 31.12.2019–30.11.2023 разбит на два подпериода: до COVID‑19 и после. В периоды экономических шоков, таких как пандемия COVID‑19, поведение этих двух типов инвесторов становится особенно контрастным. Результаты исследования показали, что FIIs и DIIs противоположны друг другу: когда FIIs инвестируют, DIIs являются чистыми продавцами, а когда FIIs продают, DIIs выступают чистыми инвесторами. В условиях пандемии FIIs часто увеличивали свои вложения в индийские активы, в то время как DIIs, напротив, сокращали свои позиции. Однако в пост-пандемиче ский период ситуация изменилась: DIIs стали играть более значимую роль в динамике Nifty50, тогда как влияние FIIs снизилось. Таким образом, анализ взаимодействия FIIs и DIIs позволяет сделать вывод о сложной и многогранной природе влияния институциональных инвесторов на фондовый рынок Индии. Их стратегии и поведение оказывают существенное воздействие на рыночные индексы и волатильность, что требует тщательного мониторинга и анализа для эффективного управления инвестиционными рисками и принятия обоснованных решений в условиях нестабильности.</p></abstract><trans-abstract xml:lang="en"><p>In the context of a dynamic and highly competitive financial market, understanding the behaviour of various categories of investors becomes a key factor in developing effective investment strategies and forecasting market trends. This study examines the phenomenon of Nifty50 — a group of the 50 most liquid and significant stocks in the Indian stock market, which play an important role in forming the overall index. The purpose of the study is to determine the influence of foreign institutional investors (FIIs) and domestic institutional investors (DIIs) on the dynamics of Nifty50.The authors apply classical research methods: correlation analysis, a statistical model for analysing and forecasting the volatility of time series (GARCH), and artificial neural networks (ANN).The study is based on daily data on investments from the two specified groups of investors and the values of the Nifty50 index of the National Stock Exchange. The study period from 31.12.2019 to 30.11.2023 is divided into two sub-periods: before COVID‑19 and after. In periods of economic shocks, such as the COVID‑19 pandemic, the behaviour of these two types of investors becomes particularly contrasting. The results of the study showed that FIIs and DIIs are opposite to each other: when FIIs invest, DIIs are net sellers, and when FIIs sell, DIIs are net investors. In the context of the pandemic, FIIs often increased their investments in Indian assets, while DIIs, on the contrary, reduced their positions. However, in the post-pandemic period, the situation changed: DIIs began to play a more significant role in the dynamics of Nifty50, while the influence of FIIs decreased. Thus, the analysis of the interaction between FIIs and DIIs allows us to conclude the complex and multifaceted nature of the influence of institutional investors on the Indian stock market. Their strategies and behaviour have a significant impact on market indices and volatility, which requires careful monitoring and analysis for effective management of investment risks and making informed decisions in unstable conditions.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>фондовый рынок Индии</kwd><kwd>институциональные инвесторы</kwd><kwd>FIIs</kwd><kwd>DIIs</kwd><kwd>Nifty50</kwd><kwd>GARCH</kwd><kwd>ANN</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Indian stock market</kwd><kwd>institutional investors</kwd><kwd>FIIs</kwd><kwd>DIIs</kwd><kwd>Nifty50</kwd><kwd>GARCH</kwd><kwd>ANN</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Agarwal B. FII inflows into Indian IPOs and its impact on the Indian stock market. Emerging Economy Studies. 2016;2(1):129-144. DOI: 10.1177/2394901515627739</mixed-citation><mixed-citation xml:lang="en">Agarwal B. 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