Income-focused investors naturally sit up and pay attention whenever a company announces a dividend increase.

The situation becomes even more compelling when three large-cap names within Temasek Holdings' portfolio all lift their payouts at once.

Temasek, a Singapore-based global investment firm, owns a 23.3% interest in Singapore Exchange (SGX: S68) through SEL Holdings.

It also controls 51% of ST Engineering (SGX: S63) and holds roughly 50% of Sembcorp Industries (SGX: U96).

While a larger distribution is always well-received, the crucial consideration is whether each of these increases is genuinely sustainable over the long term.

What makes SGX's dividend trajectory so promising?

Singapore Exchange recently published its earnings for the fiscal year concluding 30 June 2026 (FY2026).

Unlike the calendar-year cycle followed by the other two firms, the bourse operates on a July-through-June financial calendar.

Net revenue advanced 13.9% year over year, reaching S$1.5 billion.

The Equities – Cash segment grew 28.1% to S$502.9 million, supported by daily average securities traded value of S$1.8 billion, reflecting a solid 34.9% uptick.

In parallel, FICC revenue improved 17.0% to S$376.2 million, lifted by record activity in currency and commodity derivatives.

Adjusted net profit climbed 24.6% to S$759.5 million, excluding a S$53.4 million goodwill impairment related to Scientific Beta.

The exchange declared a full-year FY2026 dividend of S$0.570 per share, a considerable step up from S$0.375 in the prior year.

Ordinary dividends comprised S$0.445 of that figure, with the remaining S$0.125 delivered as a one-time special distribution.

SGX generated a robust S$788.8 million in free cash flow during FY2026.

It also held S$1.8 billion in cash reserves versus S$628.2 million in outstanding borrowings.

Going forward, management has guided for quarterly dividend increments of 0.25 cents per share through FY2028, complete debt repayment in FY2027, and medium-term revenue expansion of 6% to 8%, excluding treasury income.

SGX produces more than sufficient free cash flow to sustain its elevated payout and maintains a comfortable net cash position.

Among the three stocks featured here, this particular dividend increase appears to be the most firmly anchored.

Does ST Engineering's payout rest on solid earnings fundamentals?

ST Engineering lifted its most recent quarterly dividend by 25% year over year.

The 2Q2026 interim distribution came in at S$0.05 per share, up from S$0.04 in 2Q2025.

That brought total dividends for 1H2026 to S$0.09, compared with S$0.08 in the same period last year.

The board has additionally scheduled a further interim dividend of S$0.05 for 3Q2026.

Revenue advanced 11.1% year over year to S$6.6 billion for 1H2026, while net profit expanded 27.1% to S$512.1 million.

Earnings growth outran revenue across all three operating divisions, and free cash flow strengthened to S$591.6 million from S$484.6 million a year earlier.

Net finance expenses also declined by 14.9%.

Commercial Aerospace revenue jumped 15% year over year, driven by higher engine MRO, nacelle, and spare parts sales.

Urban Solutions & Satcom saw operating profit multiply fourfold as rail and tolling project deliveries accelerated.

Importantly, the group's order book reached a record S$35.7 billion, with approximately S$5.7 billion earmarked for delivery over the remainder of 2026.

That considerable pipeline offers strong earnings visibility, underpinning the dividend increase with several years of contracted revenue.

Can Sembcorp's higher dividend be maintained?

Sembcorp Industries raised its interim dividend by 22% year over year to S$0.11 per share.

Revenue increased 28% to S$3.8 billion for 1H2026.

These figures incorporate one month of contribution from Alinta, which Sembcorp acquired on 1 June 2026 for S$5.1 billion.

Net profit, however, dropped 72% year over year to S$150 million.

The group absorbed S$155 million in Alinta transaction expenses and no longer benefited from prior-year divestment gains.

Excluding those items, underlying net profit fell 25% to S$369 million.

Free cash flow turned negative at S$39 million, versus a positive S$241 million in the same period last year.

Total borrowings rose from S$9.0 billion at the end of 2025 to S$15.2 billion following the Alinta acquisition.

As of 30 June 2026, the group held S$1.3 billion in cash.

Operationally, weaker wind and solar conditions in China and India weighed on renewable generation output.

Lower vesting volumes and softer spark spreads in Singapore pressured gas earnings, while gas curtailment at an associate company contributed additional drag.

Management projects a stronger second-half performance.

A new 600 MW hydrogen-ready facility and a full six months of Alinta contribution should help steady operations.

Although the dividend increase signals management's confidence in Alinta's long-term value creation, the actual cash flow needed to back that confidence has not yet fully materialised.