As of August 21st, 2025, the top 5 stocks that are classified as top gainer stocks are Acset Indonusa Tbk., with 34.71%, Venteny Fortuna International Tbk., with 30.93%, Optima Prima Metal Sinergi Tbk., with 25.32%, Mandala Multifinance Tbk., with 25$, and Medela Potentia Tbk., with 24.76%. Meanwhile, the top 5 stocks that are classified as top losers are Dian Swastatika Sentosa Tbk., with -14.94%, Abadi Nusantara Hijau Investasma Tbk., with -9.89%, Agung Menjangan Mas Tbk., with -9.72%, Danasupra Erapacific Tbk., with -9.55% and Ristia Bintang Mahkotasejati Tbk., with -7.14%. The significant gains and losses in the Indonesian stock market were driven by various corporate and market-specific factors. Acset Indonusa Tbk. surged by 34.71%, mainly due to its strong financial performance in Q1 2025, where it reported a substantial increase in revenue and a significant reduction in net loss, alongside a major capital injection from United Tractors, its parent company. Venteny Fortuna International Tbk., a leading player in the consumer goods sector, Optima Prima Metal Sinergi Tbk., a key player in the metal industry, Mandala Multifinance Tbk., a prominent financial services provider, and Medela Potentia Tbk., a growing player in the healthcare sector, also experienced sharp increases ranging from 24% to 31%, likely driven by positive market sentiment, strong earnings reports, or potential corporate actions such as partnerships or new project acquisitions, although specific public disclosures are limited. On the other hand, Dian Swastatika Sentosa Tbk. Saw a steep decline of -14.94%, which may reflect disappointing earnings or adverse investor sentiment. The other top losers—Abadi Nusantara Hijau Investasma Tbk., Agung Menjangan Mas Tbk., Danasupra Erapacific Tbk., and Ristia Bintang Mahkotasejati Tbk.—experienced losses between 7% and 10%, likely due to weak financial results, internal operational challenges, or general market volatility affecting investor confidence. For a risk-averse investor, the sharp fluctuations seen in both the top gainers and losers make these stocks generally unsuitable, as they prioritize stability and capital preservation over high returns. They should avoid investing in these companies until they demonstrate strong fundamentals and minimal volatility, which supports consistent, long-term financial performance. A moderate investor, who balances risk and return, may consider selectively investing in certain top gainers like Acset Indonusa or Mandala Multifinance if their financial improvements are sustainable and backed by positive corporate developments, while remaining cautious with clear exit strategies in place. However, they should avoid the top losers unless there is solid evidence of recovery. Meanwhile, an aggressive investor might view both the top gainers and losers as trading opportunities—riding the momentum in rising stocks like Venteny or Medela Potentia for short-term gains, and potentially buying into top losers such as Dian Swastatika Sentosa if they believe the drop is a short-term overreaction. This strategy offers the potential for exciting short-term gains, but it requires active monitoring, high risk tolerance, and readiness to accept possible losses.

Picture Source: EquityMaster, 2025