Indonesia Blue Chips Face New IDX Flags With Antam In Focus

Indonesia’s blue chip stocks are about to face a new kind of spotlight as the Indonesia Stock Exchange rolls out 14 special notations on company codes starting August 3, 2026. These labels will flag issues such as bankruptcy processes, late financial reporting, or free float non compliance, which can quickly reshape how investors view even large, established companies. For you, this sharper transparency can serve as both a warning system and a filter. This article breaks down 3 stocks from the Blue Chip Stocks on the Indonesia Stock Exchange screener that are closely exposed to this news and explains why that matters for your watchlist.

Antam (Persero) (IDX:ANTM)

Overview: Antam (Persero) is a Jakarta based, state owned metals and mining company that explores, mines, processes, refines, and markets nickel, gold, silver, bauxite, alumina, and coal, with activities that extend into construction, trading, industrial services, agriculture, printing, transportation, and industrial area management, including exports.

Operations: Antam (Persero) generates most of its revenue from Precious Metals and Refinery at about IDR 69,129,231 million, followed by Nickel at IDR 15,552,912 million and Bauxite and Alumina at IDR 3,085,957 million, with smaller contributions from other activities.

Market Cap: IDR 69.2 trillion

Antam (Persero) stands out in this new transparency era because it combines blue chip status, state ownership and a broad metals portfolio with earnings and revenue growth forecasts that analysts expect to outpace the wider Indonesian market on the top line. The stock trades on a lower P/E than many peers, which can catch the eye when paired with rising net profit margins and regular inclusion in major indices. At the same time, investors need to weigh concerns such as dividends that are not well covered by free cash flow, an inexperienced board, high non cash earnings and a funding structure reliant on external borrowing. The new IDX special notations could make that contrast between perceived stability and these underlying pressures even more important for Antam.

Antam (Persero) sits at the crossroads of state backing, wide metals exposure and analyst growth expectations that many investors may not have fully priced in yet. Before you decide how to treat that lower P/E and funding mix, review the 4 key rewards and 2 important warning signs (1 is major!)

Perusahaan Perseroan (Persero) PT Telekomunikasi Indonesia (IDX:TLKM)

Overview: Perusahaan Perseroan (Persero) PT Telekomunikasi Indonesia is Indonesia’s flagship telecom and digital connectivity company, providing mobile, fixed broadband, pay TV, enterprise ICT solutions, wholesale connectivity, data centers and digital services to consumers and businesses at home and abroad.

Operations: Telkom Indonesia generates most of its revenue from B2C services at about IDR 110,992,000 million and B2B infrastructure at IDR 61,868,000 million, with smaller contributions from ICT B2B at IDR 18,610,000 million, other services at IDR 29,946,000 million and international operations at IDR 11,901,000 million.

Market Cap: IDR 259,267.9 billion

Perusahaan Perseroan (Persero) PT Telekomunikasi Indonesia stands out in this new IDX notation regime because its large scale, history of detailed disclosures and compliance focus fit neatly with investors who want blue chips that already treat transparency as part of the product. Investors gain exposure to Indonesia’s data and digital infrastructure through B2B, data center and cloud initiatives, supported by group procurement and fixed mobile convergence efforts that aim to lift margins and free up cash for dividends and buybacks. At the same time, investors need to be comfortable with pressure from declining legacy revenue, an inexperienced board and dividends that are not well covered by earnings, which could matter more as the market becomes more selective about governance and capital allocation quality.

Perusahaan Perseroan (Persero) PT Telekomunikasi Indonesia looks like a connectivity powerhouse with cash engine and governance questions that are easy to underestimate at a glance. Before you decide how it fits your portfolio, read the 3 key rewards and 1 important warning sign

Indosat (IDX:ISAT)

Overview: Indosat is a Jakarta headquartered telecommunications company that provides mobile, broadband, fixed line and digital services across Indonesia, including prepaid and postpaid mobile packages, data center and cloud solutions, Internet of Things offerings and digital content such as music platforms and lifestyle apps.

Operations: Indosat generates most of its revenue from Cellular services at about IDR 50,156,747 million, followed by Multimedia, Data Communication and Internet at IDR 9,077,453 million and Fixed services at IDR 851,189 million, with small inter segment eliminations.

Market Cap: IDR 61,276.5 billion

Indosat sits in a notable position under this new IDX notation regime because it combines blue chip scale, a focus on transparent reporting and a growing digital service mix that supports double digit net profit margins. Revenue and earnings for the first half of 2026 are higher than the prior year period. Analysts highlight the company’s earnings profile and the annual dividend adds an income angle, while the stock trades below some published fair value estimates. Investors need to weigh an all borrowing funding structure, revenue pressure from a price sensitive customer base and ongoing heavy capex. The combination of growth optionality and balance sheet strain is an example of what the new special notations are designed to help track more closely for Indosat.

Indosat’s combination of higher first half 2026 revenue and earnings, together with an all borrowing balance sheet, raises significant questions about how long this engine can continue to run at full speed. Get the full picture in the analysis report for Indosat

The three blue chip stocks in this article are just a starting point, as the full Blue Chip Stocks on the Indonesia Stock Exchange screener surfaces 10 more large Indonesian companies with health, dividend and valuation profiles that tell equally compelling stories. Use Simply Wall St to identify and analyze the specific catalysts, balance sheet strength and dividend track records that matter most to you, and focus on the highest conviction ideas from this group.

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If Perusahaan Perseroan (Persero) PT Telekomunikasi Indonesia or any of these companies sound like a great opportunity, register for FREE with Simply Wall St and add your companies to a Watchlist to monitor the share price against the fair value the ideal entry point. Once you've made your move, manage your holdings with our Portfolio Command Center that filters out the noise to deliver only the most critical, actionable updates. Throughout your journey, our Community allows you to filter the best ideas from thousands of investor perspectives. By uncovering hidden catalysts and risks early, you'll accelerate your decision-making and stay one step ahead of the market.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.

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