Bourse Scraps Rp 50 Floor to Unleash Penny Stocks as Analysts Warn of Escalating Volatility Risks

JAKARTA, Investortrust.id — The Indonesia Stock Exchange (BEI) is preparing to dismantle one of its longest-standing trading conventions, removing the statutory Rp 50 price floor to allow equities to trade down to Rp 1 starting Monday, Sept. 28, 2026.

While market authorities framed the structural overhaul as a necessary step to expand trading activity, refine price discovery, and revitalize frozen liquidity across low-priced shares, market strategists are issuing strong cautions. Investors, analysts warn, must recalibrate their trading frameworks to manage sharp swings in volatility and widening downside risks.

Speaking to Investortrust on Tuesday, Sept. 22, 2026, Senior Technical Analyst at PT Mirae Asset Sekuritas Indonesia Muhammad Nafan Aji emphasized that the removal of the Rp 50 threshold requires a fundamental shift in portfolio risk management rather than speculative enthusiasm.

"In my view, the BEI policy lowering the minimum stock price from Rp 50 to Rp 1 starting Sept. 28, 2026, must be viewed primarily from the perspective of volatility shifts and risk management, not merely as a speculative opportunity in low-priced shares," Nafan said on Tuesday.

For decades, the Rp 50 floor acted as an artificial safety net for underperforming listed companies on the regular board. By permitting share prices to descend all the way to Rp 1, the exchange operator is bringing Indonesian equity mechanics closer to international market standards, eliminating artificial liquidity bottlenecks where capital remained trapped behind unfillable sell orders. However, unanchoring penny stocks exposes retail market participants to heightened percentage volatility, where a movement of just one or two price fractions can wipe out a substantial portion of an equity position.

Phased Auto-Rejection Restructuring

The elimination of the Rp 50 baseline is accompanied by an overhaul of the exchange's daily Upper Auto-Rejection Limits (ARA) and Lower Auto-Rejection Limits (ARB) across regular and cash markets, executed across two distinct phases.

During the initial transition phase running from Sept. 28 through Dec. 31, 2026, the bourse is enforcing asymmetric parameters. For shares priced between Rp 1 and Rp 10, the daily upper and lower thresholds are fixed at a flat nominal tick limit of Rp 1. For equities trading above Rp 10 up to Rp 200, the upper ceiling allows gains of up to 35% while the downside floor is capped at 15%. Across the mid-tier range of shares priced above Rp 200 up to Rp 5,000, the upper threshold is set at 25% alongside a 15% lower floor, while shares above Rp 5,000 face an upper boundary of 20% against the same 15% downside cap.

The structural shift deepens on Jan. 1, 2027, when the exchange will implement fully symmetrical auto-rejection boundaries across all standard price tiers. Under that regime, the maximum allowable downside will mirror upside limits, meaning shares trading between Rp 10 and Rp 200 will have both their upper and lower daily limits set at 35%.

"Mechanically, widening the ARB opens up much larger downside price movement in a single trading day compared to a 15% ARB," Nafan observed.

Illustrating the impact, Nafan explained that a stock trading at a reference price of Rp 100 under the fourth-quarter 2026 rules would hit its upper limit at Rp 135 (+35%) and its lower limit at Rp 85 (-15%). Once symmetrical limits take effect in January 2027, the same Rp 100 stock could fall to Rp 65 (-35%) within a single session before trading is halted by circuit breakers.

"Investors need to realize that this change effectively magnifies the daily downside range starting in 2027," Nafan noted.

Never Treat ARB as a Stop Loss

Nafan advised market participants against memorizing broad percentage targets without accounting for underlying price ticks and shifting price bands.

"For shares approaching threshold prices such as Rp 10 or Rp 200, transitioning into another price bracket will alter the effective nominal limits," Nafan said.

He urged retail traders to check reference prices and prevailing range classifications at the open of each morning trading session, while emphasizing that an ARB circuit breaker should never be used as a substitute for a disciplined stop-loss strategy.

"Investors need greater discipline when defining their risk boundaries because the auto-rejection limit does not represent a safe loss floor," Nafan explained. "It is merely a boundary set by exchange trading mechanics."

He stressed that fundamental business health, operational balance sheets, trading volumes, and bid-ask spreads must guide capital deployment once the safety barrier at Rp 50 is eliminated.

"Particularly in low-priced shares with thin liquidity, a price shift of just one or several fractions can generate immense percentage changes," Nafan warned. "It is not enough for investors to simply look at how cheap a stock looks once the Rp 1 rule takes effect. They must evaluate corporate fundamentals, actual market liquidity, and ensure the resulting volatility aligns with their personal risk profile."