<![CDATA[This study analyzes the price movement of PT Bank Negara Indonesia (Persero) Tbk (BBNI) shares using a combination of Bollinger Bands and the Relative Strength Index (RSI) and identifies the resulting buy and sell signals. A descriptive quantitative approach was applied to secondary monthly closing price data from Yahoo Finance, comprising 25 observations (January 2024–January 2026). Bollinger Bands were calculated with a 20-period window and a deviation factor of 2, RSI with a 14-period window, and the data were processed using RStudio. A buy signal was defined as the price at or below the lower band with RSI ≤ 30, and a sell signal as the price at or above the upper band with RSI ≥ 70. The closing price fell from IDR 5,750 to IDR 4,490. From August 2025 to January 2026, the price stayed between the lower and upper bands and below the middle band, while the band width narrowed from 52.6% to 38.3%. RSI ranged from 35.0 to 44.0 and remained in the neutral zone throughout. Consequently, the combination of the two indicators produced neither buy nor sell signals, so its accuracy could not be measured. Future research is advised to use daily data so that signals can be tested.]]>
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