ISAT A Telecom That Grew Profit 14% While Its Subscriber Base Shrank

Growth Without New Customers: The ARPU Story

Indosat Ooredoo Hutchison (Indosat, IDX: ISAT) - Indonesia's second-largest cellular operator, formed by the 2022 merger of the original Indosat Ooredoo with Hutchison 3 Indonesia - posted a quarter that looks, on the surface, like an ordinary healthy telecom result: consolidated revenue grew 12.1% year-over-year to Rp15,220.7 billion, EBITDA^» grew 12.9% to Rp7,245.4 billion at a 47.6% margin, and net income attributable to owners grew 13.7% to Rp1,491.3 billion. But the subscriber line underneath that growth tells a different story: Indosat's total customer base actually fell from 95 million to 94 million year-over-year, while postpaid subscribers held flat at roughly 2 million. Every bit of this quarter's growth came from monetizing the same (or slightly smaller) customer base harder, not from acquiring more of it - blended ARPU^» jumped 15.3% year-over-year to Rp45,200, with postpaid ARPU up even more sharply (Rp87,800 to Rp97,500).

This is the classic mature-telecom pivot from subscriber growth to monetization, and it's happening alongside a genuine capability push: on March 20, 2026, Indosat announced a collaboration with NVIDIA at GTC 2026 to build AI capabilities in Indonesia using the open-source Nemotron model, and separately partnered with Google to bundle Gemini AI access into its myIM3 and BIMA+ apps starting April 8, 2026. Neither shows up in this quarter's numbers yet - they're forward-looking positioning, not revenue - but they signal where the growth story is heading next: from selling data by the gigabyte to selling AI-enabled services on top of the network.

The Prescription

Indosat should keep pushing MIDI (Multimedia, Data Communication, Internet) - its enterprise/data/connectivity segment - harder than any other line. MIDI grew revenue 17.5% year-over-year this quarter, the fastest of the three segments, off a base that's still only 15.1% of total revenue. That's exactly the kind of segment an AI-infrastructure and Nemotron/Gemini partnership should be built to accelerate - enterprise connectivity and data-center-adjacent services are a far more natural home for "AI access in Indonesia" than a consumer prepaid SIM card, and MIDI is already growing faster than the cellular business it's currently dwarfed by.

What it should stop doing: describing rising costs as isolated line-item explanations without connecting them to a margin narrative. Employee expense grew 51.9% year-over-year this quarter - nearly 4.5x faster than revenue - attributed to "performance-based variable compensation, including bonuses and incentives." That explanation may be entirely accurate for one quarter, but a management team that wants credit for capital discipline (net debt/EBITDA fell to 0.31x, interest coverage improved to 25.5x) needs to show the same discipline showing up in the opex line, not just the balance sheet. If variable comp keeps growing at 4x the rate of revenue, next quarter it stops being a one-off and starts being a trend investors will notice on their own.

Key Financial Metrics

Q1 2026 (quarter ended Mar 31, 2026) vs. Q1 2025, consolidated

FX: Rp16,936.40 = US$1 (Mar 31, 2026) and Rp16,652.00 = US$1 (Mar 31, 2025) - month-end market quotes, used only to convert the USD columns below; the rupiah figures are the company's own disclosed numbers.

Metric	Q1 2026 (Rp)	Q1 2026 (US$)	Q1 2025 (Rp)	YoY (Rp)	YoY (US$)
Revenue	Rp15,220.7B	~$898.7M	Rp13,577.9B	✅ +12.1%	✅ +10.2%
EBITDA (margin 47.6% vs 47.2%)	Rp7,245.4B	~$427.8M	Rp6,415.1B	✅ +12.9%	✅ +11.1%
Operating Income»	Rp3,018.1B	~$178.2M	Rp2,789.6B	✅ +8.2%	✅ +6.4%
Net Income (attributable to owners of the parent)	Rp1,491.3B	~$88.1M	Rp1,311.1B	✅ +13.7%	✅ +11.8%
...of which, consolidated total (incl. non-controlling interests»)	Rp1,525.6B	~$90.1M	Rp1,412.2B	⚠️ +8.0%	⚠️ +6.2%
Free Cash Flow» (operating cash flow - capex, excl. right-of-use assets)	Rp2,341.8B	~$138.3M	not disclosed this quarter	n/a	n/a
Total Cash	Rp5,564.4B	~$328.6M	Rp4,280.4B	✅ +30.0%	✅ +28.0%

The rupiah barely moved against the dollar over the year (Rp16,652 to Rp16,936.40, roughly -1.7%), so the USD columns track the rupiah columns closely this quarter - unlike a currency-crisis year, there's no material FX distortion to explain away here. The one metric that diverges from the headline story is the non-controlling-interest split: owners' net income grew 13.7%, but the profit attributable to non-controlling interests fell 66.1% (Rp101.1 billion to Rp34.3 billion), which is why consolidated total net income grew a slower 8.0% than the owners' figure being headlined - see Beyond the Usual below.

Operating cash flow grew a healthy 7.5% (Rp6,067.9 billion to Rp6,525.3 billion), but the company's info memo doesn't disclose a comparable Q1 2025 capex figure, so a like-for-like free cash flow comparison isn't possible this quarter - only this quarter's own Rp2,341.8 billion (Rp6,525.3 billion operating cash flow less Rp4,183.5 billion of accrual capex, which itself excludes Rp2,924.5 billion of right-of-use lease assets under PSAK 116).

Revenue, EBITDA, and net income all grew at a healthy double-digit clip this quarter - but every bit of that growth came from charging existing customers more, not from adding new ones. See Growth Without New Customers above.

Key Operational Metrics

Metric	Q1 2026	Q1 2025	YoY	Q4 2025	QoQ
Total subscribers	94 million	95 million	⚠️ -1.1%	94 million	➖ flat
Postpaid subscribers	~2 million	~2 million	➖ flat	~2 million	➖ flat
Blended ARPU	Rp45,200	Rp39,200	✅ +15.3%	Rp44,100	✅ +2.5%
Postpaid ARPU	Rp97,500	Rp87,800	✅ +11.0%	Rp90,600	✅ +7.6%
Prepaid ARPU	Rp44,100	Rp38,400	✅ +14.8%	Rp43,200	✅ +2.1%
Minutes of use	4.3 min	5.2 min	⚠️ -17.3%	4.7 min	⚠️ -8.5%
Data traffic	4,906 PB	3,922 PB	✅ +25.1%	4,874 PB	✅ +0.7%
4G BTS (base transceiver stations)	212,305	202,179	✅ +5.0%	n/a this period	n/a
5G BTS	9,972	107	✅ +9,219.6%	n/a this period	n/a

Data traffic growing 25.1% while minutes of use keeps falling (-17.3% YoY) is the same monetization story showing up at the network level - customers are using Indosat for data, not voice, and the company is being paid more per user for exactly that. The 5G buildout is still tiny in absolute terms (9,972 BTS vs. 212,305 for 4G) but grew from a near-zero base a year ago.

Segments

Indosat reports three segments: Selular (cellular - voice, SMS, data, value-added services to individual and business customers), MIDI (Multimedia, Data Communication, Internet - enterprise IT services, fixed connectivity, data center, and related services), and Telekomunikasi Tetap (Fixed Telecommunications - international and fixed-network voice). The company doesn't disclose segment-level operating profit or margin in this quarter's info memo, only segment revenue - so the comparison below covers growth and mix, not profitability by segment.

Segment	Revenue Q1 2026	Revenue Q1 2025	YoY	Share of Q1 2026 Revenue
Selular (cellular)	Rp12,702.6B	Rp11,421.8B	✅ +11.2%	83.5%
MIDI (enterprise/data/IT)	Rp2,305.3B	Rp1,961.4B	✅ +17.5%	15.1%
Telekomunikasi Tetap (fixed)	Rp212.8B	Rp194.7B	✅ +9.3%	1.4%
Total	Rp15,220.7B	Rp13,577.9B	✅ +12.1%	100%

Selular

Still 83.5% of revenue and growing in line with the consolidated average, driven by rising data and value-added-service revenue that outweighed continued declines in voice, SMS, and interconnection revenue - the same shift from legacy telecom to data services every operator in this market is going through.

MIDI

The fastest-growing segment (+17.5%) off the smallest meaningful base, driven by IT services and fixed connectivity growth that outweighed a decline in fixed internet revenue. This is the segment The Prescription above argues Indosat should be leaning into hardest, given both its growth rate and its natural fit with the company's new AI-infrastructure positioning.

Telekomunikasi Tetap

The smallest segment at 1.4% of revenue, growing 9.3% on higher international and fixed-network voice revenue. Too small to move the consolidated numbers meaningfully either way.

Stock Price: A 47.6% Round Trip in Under a Year

Indosat's share price didn't move in a straight line over the two years leading into this quarter. It closed Q1 2026 at Rp2,090 - roughly flat with where it started this window in April 2024 (Rp2,750, down 24.0%) - but the path there was anything but calm: shares peaked at Rp2,775 in July 2024, then fell as low as Rp1,455 by March 2025, a 47.6% peak-to-trough decline in under a year, before recovering to the Rp2,090-2,390 range it's traded in since mid-2025. Nothing in this quarter's own numbers - steady double-digit revenue and profit growth, falling leverage - explains that scale of drawdown; it reads as a market-wide or sector-wide de-rating (Indonesian telecom and broader IHSG-linked equities saw a similar pattern over the same window) rather than an Indosat-specific problem showing up in the fundamentals covered in this post.

Beyond the Usual

A note on source depth: Indosat's filed interim quarterly financial statements with footnotes could not be retrieved for this quarter after a genuine search - the exchange's filing site blocked automated and manual download attempts behind a bot-detection challenge. Everything below is sourced from the company's own info memo/press release, which itself reproduces the full unaudited profit-and-loss statement, balance sheet, and cash flow statement (not just a marketing summary), but doesn't include the notes-to-financial-statements where related-party, commitment, and contingency detail would normally live. That means this section is thinner than a quarter with a full quarterly report - a deeper footnote pass is planned once the filed statements are retrievable.

Owners' Profit Grew Faster Than Consolidated Profit, and the Gap Is the Minority Interest

Net income attributable to owners of the parent grew 13.7% year-over-year (Rp1,311.1 billion to Rp1,491.3 billion), the number the headline and this post's title lead with. But that's not the whole profit pool: consolidated net income (including non-controlling interests) grew a slower 8.0% (Rp1,412.2 billion to Rp1,525.6 billion), because the portion attributable to non-controlling interests fell 66.1% (Rp101.1 billion to Rp34.3 billion). The info memo doesn't explain why the minority stake's share of profit shrank this sharply - whether a specific subsidiary with outside ownership underperformed, or an ownership-structure change shifted the split - and that explanation isn't available without the full financial statements. Until it is, "profit grew 13.7%" is the correct number for the equity a public shareholder actually owns, but it's growing off a shrinking slice of a slower-growing total.

A Year-Ago One-Off Is Making This Quarter's Cost Growth Look Worse Than It Is

The "other operating expenses/income - net" line swung from a Rp278.1 billion net gain in Q1 2025 to a Rp109.4 billion net expense in Q1 2026 - a Rp387.5 billion swing that's the single largest driver behind this line's 136.9% year-over-year increase. The info memo attributes the year-ago gain to a one-time reversal of a tax provision, a gain on early termination of a site lease, and a gain on asset disposal - none of which repeated this quarter. This is a base-effect distortion, not a sign that Indosat's underlying cost base deteriorated: strip the Q1 2025 one-offs out of the comparison and this line's year-over-year growth would look far more ordinary. Worth remembering the next time this line is compared year-over-year, since the comparison period itself was unusually flattered.

Employee Costs Grew Nearly 4.5x Faster Than Revenue

Employee expense rose 51.9% year-over-year (Rp808.5 billion to Rp1,227.9 billion), attributed entirely to higher performance-based variable compensation - bonuses and incentives tied to this quarter's results. Genuinely strong results can justify a genuinely strong bonus pool, and this is disclosed plainly rather than buried. But it's the fastest-growing cost line in the entire income statement by a wide margin, and it's exactly the line The Prescription above flags as worth watching for whether it's a one-quarter reward or the start of a structural cost creep.

Target Valuation Range

Bottom line: roughly Rp1,984-Rp5,129 fair-value range (bear-to-bull, EV/EBITDA-based) against a Rp2,090 actual close - the stock is trading near the bottom of that range on an unusually depressed multiple (~2.6x annualized EV/EBITDA) for a company whose leverage and coverage ratios both improved this quarter, which argues for cautious optimism rather than either extreme.

Market cap → enterprise value	Q1 2026 (period-end)
Share price (period-end)	Rp2,090
Shares outstanding (derived: disclosed market cap ÷ disclosed share price)	~32.25 billion
Market capitalization (company-disclosed)	Rp67,400B (~$3.98B)
Plus: total principal debt (excl. lease liabilities, per company disclosure)	Rp14,036.5B
Less: cash and cash equivalents	Rp5,564.4B
Enterprise value	~Rp75,872.1B (~$4.48B)

Peer/multiple sanity check	Q1 2026
Net debt / EBITDA (company-disclosed)	0.31x (vs. 0.36x a year ago)
EBITDA / interest paid (company-disclosed)	25.50x (vs. 22.84x a year ago)
EBITDA (annualized ×4)	Rp28,981.6B
EV / EBITDA (annualized)	~2.62x
Owners' net income (annualized ×4)	Rp5,965.2B
P/E (annualized)	~11.3x

Indosat's own disclosed leverage ratios (0.31x net debt/EBITDA, 25.5x interest coverage) describe a balance sheet with real room to spare, and both improved from a year ago. Telkom Indonesia (TLKM), the market leader, posted a comparable 47.6%-48.3% EBITDA margin range in its own Q1 2026 results - close to Indosat's 47.6%, suggesting Indosat's core profitability is competitive with the larger incumbent rather than structurally weaker. A full peer EV/EBITDA comparison against TLKM or XL Axiata (EXCL) isn't included here because this site hasn't yet verified those companies' contemporaneous share counts against a downloaded source document - stating one company's multiple without the other's would invite a false precision this post doesn't have.

What the ~2.62x annualized EV/EBITDA multiple does say on its own: it's a low number for a company growing profit double digits with falling leverage. It's not directly comparable to the ~11.4x this site found for Telkom back in its own Q1 2015 coverage - that reference point is over a decade old and reflects a very different rate and equity-market environment, not a live peer comp - but it's a reminder that "mature telecom" multiples have historically run well above where Indosat trades today. Either the market is pricing in a real risk this document doesn't capture (regulatory, competitive, or integration-related, given Indosat's own post-merger history), or the stock is simply cheap relative to what its own numbers this quarter show.

Scenario	Key assumption	Multiple	Implied EV	Implied price
Current (Q1 2026 close)	actual market price, for reference	~2.62x annualized EBITDA	~Rp75,872B	Rp2,090
Bear	Multiple stays near today's depressed level; market continues discounting for risk not visible in this filing	~2.5x	~Rp72,454B	~Rp1,984
Base	Multiple re-rates modestly as falling leverage (0.31x net debt/EBITDA) gets priced in over coming quarters	~4.0x	~Rp115,926B	~Rp3,332
Bull	Multiple re-rates further toward (but still below) the mature-telecom range this site anchored around Telkom's 2015 coverage	~6.0x	~Rp173,890B	~Rp5,129

Even the bear case sits only modestly below today's actual price, while the base and bull cases both imply substantial upside - the asymmetry here comes from how low the starting multiple already is, not from aggressive assumptions on any one scenario. The real question this valuation can't answer from this quarter's documents alone is why the market is pricing Indosat at such a discounted multiple in the first place - that's exactly the kind of question the missing footnoted financial statements (see Beyond the Usual above) would be best placed to help answer.

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