ISAT Where Did Indosat's 2025 Profit Growth Actually Come From?

A Flat Core Business, Dressed Up by One Line Item

Indosat Ooredoo Hutchison (Indosat, IDX: ISAT) closed FY2025 with headline numbers that look like a normal healthy year: consolidated revenue up 1.1% year-over-year to Rp56,518.1 billion, EBITDA^» up 0.8% to Rp26,597.3 billion at a 47.1% margin, and net income attributable to owners up a much punchier 12.2% to Rp5,509.7 billion. Read only the last number, and this looks like a company genuinely accelerating. Read the first two, and it looks nearly stagnant.

The reconciliation is a single line: "Other Operating Income (Expense) - net" - the aggregate of foreign-exchange gains/losses, the share of net loss from associates and joint ventures, and gains on asset disposals - swung from a Rp21.3 billion net gain in FY2024 to a Rp508.7 billion net gain in FY2025, a Rp487.4 billion favorable swing the company attributes to "one-off reversal of tax provisions, gain on asset disposal and lower share of net loss of associates and joint ventures." Operating profit grew Rp437.0 billion year-over-year (Rp10,837.9 billion to Rp11,274.9 billion) - which means without that swing, operating profit would have been roughly flat to slightly down. Indosat's own EBITDA measure excludes this line entirely (it's the gap between operating profit plus D&A and the disclosed EBITDA figure), which is exactly why EBITDA grew only 0.8% while operating profit and net income, which both sit below that exclusion, grew faster. The core telecom business had a genuinely quiet year; a non-recurring accounting and tax item did the rest of the work on the profit line.

The Prescription

Indosat should keep leaning into MIDI (Multimedia, Data Communication, Internet) the same way this site argued after Q1 2026 - it's still the fastest-growing segment (+4.5% for the full year, against Cellular's +0.7% and Fixed Telecom's -5.4%) and the natural home for the AI-infrastructure partnerships the company keeps announcing (Nokia/NVIDIA's AI-RAN Research Center in November 2025, the Qualcomm Dragonwing RAN Automation Suite in December 2025). A full year of essentially flat Cellular revenue is not a crisis for a mature operator, but it does mean MIDI has to do more of the heavy lifting going forward than its still-modest 14.8% share of revenue suggests.

What it should stop doing: presenting net income growth as the headline profitability story without immediately showing the reader the EBITDA line next to it. Management's own investor materials lead with "12.2% YoY growth" for owners' net profit in bold, while EBITDA growth (0.8%) and the driver of the gap between them appear only deeper in the document's own numbers. A company confident in its underlying execution doesn't need a non-operating tax and asset-disposal swing to be the quiet engine of its best-looking growth figure - and if it keeps recurring, it stops being a one-off and starts being something the market prices in as ordinary earnings quality risk.

Key Financial Metrics

FY 2025 (year ended Dec 31, 2025) vs. FY 2024, consolidated, audited

FX: Rp16,709.00 = US$1 (Dec 31, 2025) and Rp16,085.60 = US$1 (Dec 31, 2024) - year-end market quotes, used only to convert the USD columns below; the rupiah figures are the company's own audited disclosed numbers. The rupiah weakened roughly 3.9% against the dollar over the year, which is why every USD-column growth rate below runs a few points behind its rupiah counterpart.

Metric	FY 2025 (Rp)	FY 2025 (US$)	FY 2024 (Rp)	YoY (Rp)	YoY (US$)
Revenue	Rp56,518.1B	~$3,383.3M	Rp55,886.9B	✅ +1.1%	⚠️ -2.6%
EBITDA (margin 47.1% vs 47.2%)	Rp26,597.3B	~$1,592.1M	Rp26,375.1B	⚠️ +0.8%	⚠️ -2.9%
Operating Income»	Rp11,274.9B	~$674.8M	Rp10,837.9B	✅ +4.0%	➖ +0.2%
Net Income (attributable to owners of the parent)	Rp5,509.7B	~$329.8M	Rp4,910.8B	✅ +12.2%	✅ +8.0%
...of which, consolidated total (incl. non-controlling interests»)	Rp5,817.5B	~$348.2M	Rp5,272.4B	✅ +10.3%	✅ +6.3%
Free Cash Flow» (operating cash flow - capex, excl. right-of-use assets)	Rp8,270.3B	~$495.0M	not comparably disclosed	n/a	n/a
Total Cash	Rp5,075.3B	~$303.8M	Rp4,454.1B	✅ +13.9%	✅ +9.5%

Operating cash flow grew 12.9% (Rp19,096.1 billion to Rp21,550.6 billion), well ahead of revenue growth. FY2025 capex was Rp13,280.3 billion (excluding Rp7,521.2 billion of right-of-use lease assets under PSAK 116, per company disclosure), giving this year's own free cash flow of Rp8,270.3 billion - the company's FY2025 materials don't disclose a comparably-defined FY2024 capex figure, so a like-for-like FCF comparison isn't possible this year, the same gap this site flagged for Q1 2026.

Profit attributable to non-controlling interests fell 14.9% (Rp361.6 billion to Rp307.8 billion), a smaller version of the same NCI-shrinkage pattern flagged after Q1 2026 - it's why consolidated total net income (+10.3%) again grew slower than the owners' figure being headlined (+12.2%), though the gap here is far narrower than Q1 2026's.

Revenue and EBITDA - the two numbers that actually describe the core telecom business - barely moved this year. Net income's much stronger 12.2% growth rode substantially on a one-off non-operating swing. See A Flat Core Business, Dressed Up by One Line Item above.

Key Operational Metrics

Metric	FY 2025	FY 2024	YoY	Q4 2025	Q3 2025	QoQ
Total customers	93.7 million	94.7 million	⚠️ -1.1%	93.7 million	94.6 million	⚠️ -1.0%
Postpaid customers	1.8 million	1.5 million	✅ +20.0%	1.8 million	1.7 million	✅ +5.9%
Prepaid customers	91.9 million	93.2 million	⚠️ -1.4%	91.9 million	92.9 million	⚠️ -1.1%
Blended ARPU	Rp40,000	Rp38,000	✅ +6.4%	Rp44,000	Rp40,000	✅ +10.5%
Postpaid ARPU	Rp93,000	Rp95,000	⚠️ -2.1%	Rp91,000	Rp91,000	➖ flat
Prepaid ARPU	Rp40,000	Rp37,000	✅ +8.1%	Rp43,000	Rp39,000	✅ +10.3%
Minutes of use	4.9 min	5.5 min	⚠️ -10.9%	4.7 min	4.7 min	➖ flat
Data traffic	17,655 PB	16,170 PB	✅ +9.2%	4,874 PB	4,532 PB	✅ +7.5%
4G BTS (base transceiver stations)	213,898	196,348	✅ +8.9%	n/a this period	n/a	n/a
5G BTS	6,872	107	✅ +6,322.4%	n/a this period	n/a	n/a

Full-year data traffic growth (+9.2%) held up even as total customers shrank slightly, the same data-over-voice shift this site flagged after Q1 2026 - minutes of use fell 10.9% for the year while data traffic kept climbing. Blended ARPU's full-year average (Rp40,000, +6.4%) understates how strong Q4 2025 alone was: ARPU jumped 10.5% quarter-over-quarter to Rp44,000 in Q4, the single strongest quarter of the year and the base the Q1 2026 quarter (already covered) then grew from further.

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). As with Q1 2026, the annual report doesn't disclose segment-level operating profit or margin, only segment revenue - so the comparison below covers growth and mix, not profitability by segment.

Segment	Revenue FY 2025	Revenue FY 2024	YoY	Share of FY 2025 Revenue
Selular (cellular)	Rp47,355.6B	Rp47,036.0B	✅ +0.7%	83.8%
MIDI (enterprise/data/IT)	Rp8,344.9B	Rp7,986.5B	✅ +4.5%	14.8%
Telekomunikasi Tetap (fixed)	Rp817.6B	Rp864.4B	⚠️ -5.4%	1.4%
Total	Rp56,518.1B	Rp55,886.9B	✅ +1.1%	100%

Selular

Essentially flat for the year (+0.7%), attributed to growth in value-added services offsetting continued declines in voice, SMS, and interconnection revenue. This is the segment absorbing almost all of the flat-revenue story above - at 83.8% of total revenue, Cellular staying nearly still is why consolidated revenue barely moved even with MIDI growing meaningfully faster.

MIDI

The fastest-growing segment for the second consecutive period this site has covered (+4.5% for FY2025, +17.5% in Q1 2026), driven by IT services growth that outweighed declines in fixed connectivity and fixed internet revenue. Still only 14.8% of revenue, but The Prescription above argues this is exactly where Indosat's AI-infrastructure partnerships should be pointed.

Telekomunikasi Tetap

The smallest and only shrinking segment, down 5.4% on lower international call revenue, partly offset by higher fixed-line revenue. At 1.4% of revenue it doesn't move the consolidated numbers, but it's now been in decline across the periods this site has tracked.

Stock Price: A Round Trip That Ended Where It Started

Indosat's share price closed FY2025 at Rp2,320 (Dec 30, 2025) - almost exactly where it started the two-year window in January 2024 (Rp2,393.75), a net move of roughly flat. The path between those two points was not calm: shares peaked at Rp2,856.25 in February 2024, then fell as low as Rp1,455 by March 2025 - a ~49% peak-to-trough decline - before recovering unevenly through the rest of 2025, closing the year Rp2,320 after touching Rp1,750 as recently as September 2025. Nothing in the FY2025 numbers above - essentially flat revenue and EBITDA, profit growth substantially explained by a one-off - obviously justifies either the depth of that 2025 trough or the scale of the subsequent recovery; it reads as a market-wide de-rating and partial re-rating (Indonesian equities broadly saw a similar pattern over the same window) more than a reaction to Indosat's own fundamentals. The stock had recovered further by Q1 2026's close (Rp2,090, already covered) before easing back toward its FY2025 year-end level.

Beyond the Usual

FY2025's Profit Growth Rode Substantially on a Non-Operating Swing the Company's Own EBITDA Measure Excludes

The single largest driver of FY2025's Rp437.0 billion operating-profit increase was a Rp487.4 billion favorable swing in "Other Operating Income (Expense) - net" (foreign-exchange gains/losses, share of associates'/joint ventures' results, and gains on asset disposal), which the company attributes to a one-off reversal of tax provisions, a gain on asset disposal, and a smaller share of net loss from associates and joint ventures. Strip that swing out and operating profit would have been roughly flat to slightly down year-over-year - which is consistent with EBITDA (which excludes this line entirely) growing only 0.8%. Net income attributable to owners, which sits below both operating profit and this swing, grew 12.2% - the headline figure management's own materials lead with. None of this is hidden; it's disclosed plainly in the company's own expense breakdown. But a reader relying only on the bolded 12.2% profit-growth figure would come away with a materially rosier picture of FY2025 than the underlying revenue and EBITDA trends support. Worth checking in FY2026 whether operating profit growth tracks EBITDA growth more closely once this one-off doesn't repeat.

A Corruption Investigation at Subsidiary Lintasarta Sits in the Financial Statement Footnotes, Not the Governance Section

The annual report's front-of-book "Legal Proceedings" section states plainly that, based on IOH's own Legal team review, "no cases meet the material and substantive qualifications for disclosure in this Annual Report." But footnote 28(b) of the audited financial statements discloses that Indonesia's Public District Attorney (Kejaksaan Negeri Jakarta Pusat) has been investigating an alleged corruption case tied to procurement for the Pusat Data Nasional Sementara (PDNS) at the Ministry of Communication and Information Technology, covering 2020-2024, and that on 22 May 2025 five individuals were named suspects - one a former director of Lintasarta, an Indosat subsidiary. A legal opinion obtained by Lintasarta's own outside counsel, dated 7 January 2026, states there is no indication of corporate criminal activity by Lintasarta based on the case's current status, and Lintasarta's management believes the matter has no legal or financial impact on the subsidiary. Taken at face value that's a reasonable basis for the front-of-book "nothing material" framing - but a live corruption investigation naming a former subsidiary director is exactly the kind of item a reader would expect flagged more prominently than a single paragraph deep in the commitments-and-contingencies note, and it's worth tracking whether the investigation's scope changes before the FY2026 filing.

Indosat Is Quietly Divesting Its Fiber Assets Into a New Joint Entity

On 22 December 2025 - nine days before FY2025 closed - Indosat's Board of Commissioners approved an in-kind contribution of the Company's and affiliate Lintasarta's fiber fixed-asset holdings into a newly formed subsidiary ("IFT"), to be followed by a sale of ownership in IFT to a third party, with Indosat and Lintasarta retaining an indirect minority stake in the transferred assets afterward. As of 31 December 2025, the book value of the fiber assets involved was Rp2,505,843 million (~$150.0M), reclassified as assets held for sale. This is a genuine structural move - effectively monetizing part of the fixed-network asset base while keeping indirect exposure to it - that happened right at FY2025's year-end and hasn't yet shown up in any revenue or profit line; worth watching for how the eventual sale proceeds and IFT's ownership economics get disclosed in FY2026.

Long-Dated Tower and Cloud/Managed-Services Commitments Function Like Off-Balance-Sheet Debt

Indosat's footnote 28 discloses several multi-year commitments that don't appear as on-balance-sheet liabilities in full: following sale-and-leaseback transactions with tower companies EPID and Mitratel between 2019 and 2023, Indosat is contractually committed to lease an additional 1,250 newly-built ("Build-To-Suit") towers and 3,500 co-location spaces on existing towers between 2023 and 2026, with Rp296,560 million still outstanding as of year-end. Separately, the Company has a minimum committed spend of Rp785,921 million (~$47.0M) under its Google Cloud Platform master agreement (signed 2021, amended since), against which it recorded Rp473,444 million of actual FY2025 cost - meaning roughly Rp312,477 million of that commitment remains to be spent under the agreement's terms regardless of actual usage. It also has a five-year network-operations managed-services agreement with Huawei (signed November 2022) under which it incurred Rp1,287,318 million (~$77.0M) of cost in FY2025 alone. None of these are disclosed as debt, but each is a real, contractually fixed future cash outflow a reader assessing Indosat's true obligations should weigh alongside the Rp15,395.2 billion of gross principal debt shown on the balance sheet.

FY2025's Falling Personnel Costs Are the Mirror Image of What Followed in Q1 2026

Personnel expense fell 11.3% in FY2025 (Rp3,889.7 billion to Rp3,449.7 billion), attributed to lower bonuses, employee income tax allowances, and other employee benefits, partly offset by higher salaries and post-employment benefits. That's worth remembering against this site's finding after Q1 2026, where employee expense jumped 51.9% year-over-year on "performance-based variable compensation, including bonuses and incentives" - nearly 4.5x faster than that quarter's revenue growth. Read together, the two periods suggest FY2025's bonus pool was held back relative to FY2024, then reset sharply higher in Q1 2026 - a pattern that could simply reflect normal year-end compensation timing, or could mean the FY2025 personnel-cost discipline this year's numbers show was itself temporary rather than structural. Worth checking whether FY2026's full-year personnel cost trend looks more like FY2025's discipline or Q1 2026's jump.

Target Valuation Range

Bottom line: roughly Rp1,742-Rp4,630 fair-value range (bear-to-bull, EV/EBITDA-based) against a Rp2,320 actual FY2025 close - the stock sits in the lower half of that range, between the bear and base cases, which is consistent with a year where EBITDA barely grew even though the headlined profit figure did.

Market cap → enterprise value	FY 2025 (period-end)
Share price (period-end)	Rp2,320
Shares outstanding (derived: disclosed market cap ÷ disclosed share price)	~32.24 billion
Market capitalization (company-disclosed)	Rp74,800.0B (~$4.48B)
Plus: total principal debt (excl. lease liabilities, per company disclosure)	Rp15,395.2B
Less: cash and cash equivalents	Rp5,075.3B
Enterprise value	~Rp85,119.9B (~$5.09B)

Peer/multiple sanity check	FY 2025
Net debt / EBITDA (company-disclosed)	0.39x (vs. 0.40x a year ago)
EBITDA / interest paid (company-disclosed)	23.59x (vs. 22.50x a year ago)
EBITDA (FY2025, actual)	Rp26,597.3B
EV / EBITDA	~3.20x
Owners' net income (FY2025, actual)	Rp5,509.7B
P/E	~13.58x

Indosat's own disclosed leverage stayed low and kept improving (0.39x net debt/EBITDA, 23.59x interest coverage) - a trend that continued further into Q1 2026 (0.31x, 25.50x, already covered). This site hasn't yet downloaded and verified a contemporaneous FY2025 share count and EV for Telkom Indonesia (TLKM) or XL Axiata (EXCL), so a direct peer EV/EBITDA comparison isn't included here - stating one company's multiple without the other's would invite false precision.

The ~3.20x actual EV/EBITDA is a low multiple in absolute terms for a company with falling leverage, even in a year where EBITDA itself barely grew - it's a touch above the ~2.62x annualized multiple this site calculated off Q1 2026's stronger quarter, and well below the ~11.4x this site found for Telkom in its own decade-old Q1 2015 coverage (a reference point from a very different rate and equity-market environment, not a live comp). Whether that gap reflects a real risk this filing doesn't capture, or simply a market that hasn't re-rated a "boring" flat year, is the open question this valuation section can flag but not resolve on its own.

Scenario	Key assumption	Multiple	Implied EV	Implied price
Current (FY2025 close)	actual market price, for reference	~3.20x actual EBITDA	~Rp85,120B	Rp2,320
Bear	Multiple compresses toward the depressed level this site found for Q1 2026; market keeps discounting for risk (Lintasarta investigation, one-off-driven earnings quality) not fully priced yet	~2.5x	~Rp66,493B	~Rp1,742
Base	Multiple holds roughly where FY2025 already trades, modestly higher as leverage keeps falling	~4.0x	~Rp106,389B	~Rp2,980
Bull	Multiple re-rates further toward (but still well below) the mature-telecom range this site anchored around Telkom's 2015 coverage	~6.0x	~Rp159,584B	~Rp4,630

The current price sits below the base case and only modestly above the bear case - a narrower, more cautious spread than Q1 2026's asymmetry, reflecting that FY2025's own numbers gave the market less to re-rate on than the stronger quarter that followed it. The base and bull cases both still imply real upside from Rp2,320, but neither is grounded in anything FY2025 itself demonstrated beyond low leverage; both depend on the market simply deciding to pay more for the same earnings power, not on that earnings power growing from here.

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