Argentina Markets: Merval & the Peso — September 17, 2026

01 The session in one read

Argentina’s main stock index, the S&P Merval — the benchmark peso-denominated equity gauge on the Buenos Aires exchange — fell 1.70% to close at 3,028,871 points on Wednesday 16 September. The wholesale dollar strengthened about 0.5% to 1,513.50 pesos, and Argentina’s country risk, the extra return investors demand to hold its debt, edged up to 510 points.

The fall was concentrated in energy. YPF, Argentina’s state-controlled oil producer and a favourite of foreign investors, dropped 5.2% in New York to $54.60. Analysts quoted by Infobae tied the move to the Federal Reserve decision rather than to anything domestic.

The domestic calendar matters more than the headlines today. Argentina’s statistics institute publishes second-quarter GDP and unemployment at 4 p.m. Buenos Aires time on Thursday 17 September, the first hard reading on the economy since the budget debate began.

Yet the pullback is modest in context. The Merval is still up roughly 71% year-on-year, reflecting continued foreign appetite for what traders call the Milei reform trade — bets that President Javier Milei’s pro-market policies will keep reducing country risk and eventually restore Argentina’s access to international capital markets.

Tuesday’s decline looks like a sector-led breather rather than a break in Argentina’s broader rally. The heaviest falls hit oil and power names, consistent with lower crude and the local report of sharply higher wholesale inflation in August, which complicates the disinflation narrative.

Banking shares were resilient — Grupo Galicia eked out a 0.5% gain while Banco Macro slipped only 0.3% — suggesting investors still see value in the domestic financial recovery. The variable to watch is whether the peso’s drift toward the ARS 1,514 area pushes the central bank into more aggressive intervention or rate signals.

02 The day’s numbers

The Merval’s 52-week strength is striking: even after Tuesday’s slide, the index is up roughly 71% over one year, one of the best showings among global benchmarks. The peso, by contrast, is just 0.1% from its weakest level in the past 12 months.

The dollar’s rise to ARS 1,513 leaves the official exchange rate at the upper end of a 1,348–1,514 range, a slow but persistent crawl that the central bank has been managing through limited daily adjustments. For foreign investors holding peso assets, the currency move shaves a little of the equity gains.

03 Why it moved — oil and US yields

Energy shares were the clear laggards after a batch of local news pointed to renewed inflation pressure from crude. Wholesale prices rose 2.1% in August, according to Clarín, driven partly by an 8% jump in oil prices during the month, a cost shock that feeds into broader inflation.

Stronger US Treasury yields also squeezed emerging markets. The 10-year US Treasury yield climbed to 5.023%, and the dollar index — a measure of the greenback against major currencies — rose 0.72%, making dollar-funded positions in Argentine equities more expensive to hold.

Banks held up better than the index. Grupo Galicia, one of Argentina’s biggest private lenders, rose 0.5% with $5 million traded, and Banco Macro slipped only 0.3%. Investors often read resilience in bank shares as a sign the domestic financial recovery remains on track even when global conditions wobble.

The peso’s decline is part of a gradual depreciation path that the government tolerates to keep exports competitive. A weaker peso helps exporters but adds pressure on local-currency investors, which is why dollar-adjusted returns for the Merval run below the headline peso number.

04 The day’s movers

The turnover picture shows exactly where traders were positioned. YPF did $15 million in volume — three times second-place Grupo Galicia — and its 4.9% fall set the tone for the main index.

Local gainers were rare. MetroGAS rose 1.7%, Transportadora de Gas del Norte gained 1.3%, and Cresud added 1.3% — all in the utilities-and-farmland corner that benefits from steady peso cash flows. Cross-listed CEDEARs, which track US shares rather than Argentine companies, were mixed and mainly reflected the soft US session rather than local fundamentals.

05 The regional scoreboard

Argentina’s 1.70% slide was not the region’s worst. Colombia’s COLCAP — the main Bogotá stock index — fell 2.16%, and every major Latin American yardstick except Peru finished in the red on Tuesday.

Peru’s BVL index rose 0.80%, the rare gainer in a session where firmer US yields and a stronger dollar weighed across the board. The live market board above carries the closing levels for all regional indices.

06 The technical picture

The Merval sits at 3,028,871 points, below its recent intraday peak but still inside a longer-term uptrend that has carried the index up roughly 71% over 12 months. Tuesday’s close leaves the benchmark testing the lower end of its short-term consolidating range.

For the peso, the technical signal is more uncomfortable. The dollar at ARS 1,513 is just one peso from the 52-week high of 1,514, meaning the exchange rate is testing a ceiling that has contained the official depreciation pace so far.

If the dollar breaks above 1,514, some traders will watch for whether the central bank steps up intervention or adjusts the pace of the crawling peg. Until then, the weight of evidence suggests a market pausing, not reversing.

07 What to watch

• IMF review: A third-review mission under Argentina’s IMF programme is due later in September; progress could shift country risk.
• Oil prices: Crude moves directly hit YPF and energy shares, the session’s heaviest weights.
• US 10-year yield: Sustained yields above 5% raise the bar for emerging-market equities.
• Peso ceiling: A break above ARS 1,514 could force a central-bank response and further influence the Merval in dollar terms.

Background: Argentina Inflation Falls to 1.7 Percent, Lowest in 14 Months.

More: Argentina news in English, every day from The Rio Times.

Frequently Asked Questions

What is the S&P Merval?

It is Argentina’s main stock index, quoted in pesos on the Buenos Aires exchange, and the broadest benchmark for Argentine equities.

Why did the Merval fall on September 16?

Energy shares led the decline — YPF dropped 4.9% — as oil weakened and wholesale inflation data reminded investors of price pressures.

What is the Milei reform trade?

It is investor shorthand for bets that President Javier Milei’s market-friendly reforms will lower country risk and draw foreign capital back to Argentina.

Why does the peso matter to foreign investors?

A weaker peso erodes the dollar value of peso-denominated stock gains, which is why dollar-adjusted Merval returns run below the headline figure.

Market data: RT; exchange figures from BYMA

This article was produced by The Rio Times’ automated newsroom system. How we use AI · Report an error · Editorial responsibility: Matthias Camenzind, Editor-in-Chief

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