Mexican Peso Slides 1.37% to 17.53 per US Dollar on September 23, Its Worst Day in Six Months
Key Facts
- —The country. Mexico, 133 million people, has been led by President Claudia Sheinbaum since 1 October 2024, the country’s first woman head of state.
- —The money. The currency is the Mexican peso. On 23 September one US dollar bought 17.531 pesos, up from 17.29 a day earlier.
- —The index explained. The S&P/BMV IPC is Mexico’s main stock index. It tracks the largest and most traded companies on the Bolsa Mexicana de Valores, the Mexico City exchange.
- —The news. On Wednesday 23 September 2026 the IPC closed at 64,318, down 0.22%, while the peso lost 1.37% — its worst single day in about six months.
- —What is new. Banxico is expected to hold rates while the US Federal Reserve is priced for further increases. That shrinking gap, not Mexican earnings, moved the peso.
- —What it means for you. A weaker peso lifts the local price of imported food, fuel, cars and electronics. Dollar earners in Mexico gain; peso earners lose buying power abroad.
- —The caveat. One session is not a trend. The peso is still 6.1% stronger than its weakest level of the past year, 18.68 per dollar.
Today’s Focus
Mexico’s S&P/BMV IPC, the country’s main stock index, closed at 64,318 on Wednesday, a 0.22% decline. The peso had a worse session, sliding 1.37% to 17.531 per dollar as traders reconsidered how much room the Bank of Mexico has to cut interest rates.
The trigger was a mix of caution around Banxico’s next policy decision and a firmer US dollar. Local media pointed to a shrinking interest-rate gap between Mexico and the US, which makes the peso less attractive for so-called carry trades, where investors borrow cheaply in dollars to earn higher yields in pesos.
Cemex, one of Mexico’s most liquid stocks, fell 3.26%, while airport group GAP gained about 1.2%. The moves show a market that is distinctly selective, not panicked, but clearly nervous about the currency leg.
What matters today. The peso’s slide, not the stock index’s modest dip, is the signal that matters most for foreign investors right now.
01 The session in one read
Mexico’s main stock index, the S&P/BMV IPC, closed at 64,318 on Wednesday, down 0.22%. It was a modest retreat, but the peso’s 1.37% slide to 17.531 per US dollar turned the session into a clear risk-off day for Mexican assets.
The catalyst was local rather than global. Investors were stepping back ahead of the Bank of Mexico’s next interest-rate decision, with local financial press reporting that the narrowing gap between US and Mexican rates is dulling the appeal of peso carry trades.
Cemex fell 3.26% in heavy turnover, making it the weakest heavily traded name. Industrial developer Vesta led the gainers with a 1.8% rise, and airport group GAP added about 1.2%.
For a foreigner, the message is simple: this was a day to be cautious about the currency, not to run from Mexican stocks.
The evidence points to a currency-driven adjustment rather than a broad equity sell-off. The S&P/BMV IPC fell only 0.22%, in line with the S&P 500’s 0.75% slip in the US, while the peso’s 1.37% slide was the standout move. That asymmetry suggests investors were repricing peso-denominated carry trades more than Mexico’s corporate fundamentals. The variable to watch is whether the peso stabilises near 17.50 or drifts toward its 52-week high of 18.68.
02 The day’s numbers
| Measure | Level | Change | Read |
|---|---|---|---|
| S&P/BMV IPC | 64,318 | −0.22% | First decline after short rebound; 10.2% below 52-week high |
| USD/MXN | 17.531 | +1.37% | Peso’s worst day in roughly six months; −6.1% vs 52-week high |
| S&P 500 | 7,706 | −0.75% | Weak external backdrop; −1.2% vs 52-week high |
| 52-week range (IPC) | 60,216–71,601 | — | Index sits in lower half of annual range |
| 52-week range (USD/MXN) | 16.89–18.68 | — | Peso remains well off worst levels of the year |
Both Mexican assets are in the lower portion of their 52-week ranges, but neither is near an extreme. The IPC is 10.2% below its 52-week high, while the peso is 6.1% off its best level. Rio Times · Live Market Intelligence
Live Market IntelligenceMexico — Live Market Board
Mexico — Live Market Board
Instrument Last Change YoY Prev. High Low Volume
IPC MEX
64,276.72
-0.28%
+12.17%
64,456.59
66,121
65,405
108,886,187
USD/MXN
17.06
-0.24%
-8.58%
17.10
17.08
17.01
—
WALMEX
48.07
-0.62%
-14.38%
48.37
48.65
48.02
10,781,446
GMEXICO
223.28
+0.35%
+73.59%
222.50
226.18
222.17
1,325,556
FEMSA
201.19
-0.24%
+25.67%
201.67
206.71
199.56
750,706
CEMEX
19.32
+0.89%
+19.10%
19.15
19.35
19.04
14,327,054
GFNORTE
193.98
+1.18%
+14.36%
191.71
195.79
191.83
1,579,115
BIMBO
60.98
-0.96%
+11.89%
61.57
61.46
60.29
1,048,115
TELEVISA
9.71
+0.21%
+12.78%
9.69
9.75
9.60
577,851
AMX
19.80
-0.95%
+12.53%
19.99
20.05
19.70
58,058,525
GAP
366.23
+0.43%
-21.21%
364.68
370.85
362.82
226,946
ASUR
275.04
+1.25%
-15.28%
271.64
275.08
271.31
15,451
OMA
233.50
+0.62%
-6.48%
232.06
235.00
230.62
555,693
KOF
188.04
+0.86%
+18.94%
186.44
188.56
185.52
425,273
GRUMA
252.90
+0.11%
-21.85%
252.61
254.74
250.36
90,048
KIMBER
39.74
+0.43%
+8.85%
39.57
40.09
39.33
490,551
AMX ADR
23.38
-0.23%
+22.25%
23.43
23.49
23.06
1,347,445
03 Why it moved — Banxico caution and the carry trade
The peso’s slide was the day’s defining move. At 17.531 per dollar, it fell 1.37%, making it one of the weakest major emerging-market currencies in the session.
The reason is the so-called carry trade. Investors often borrow in cheap, low-yielding dollars and park that money in higher-yielding Mexican assets, which supports the peso.
When the gap between US and Mexican interest rates narrows, that trade becomes less attractive. Local financial outlet El Financiero reported that this shrinking differential is precisely why the peso reversed course on Wednesday.
The stock index felt the same weight, but the broad market held up better than the currency. Breadth was actually positive, with 138 stocks advancing against 105 decliners and 16 unchanged on the Bolsa Mexicana de Valores.
04 The day’s movers
| Driver | Level / Move | Change | Note |
|---|---|---|---|
| Cemex | $31m turnover | −3.26% | Weakest heavily traded name; peso slide adds pressure |
| GAP (airport group) | $14m turnover | +1.2% Airports buck the trend | |
| Vesta | — | +1.8% Top domestic gainer; industrial developer extends recent strength | |
| Walmex | $44m turnover | +0.0% | Steady despite broader risk-off mood |
| Grupo Financiero Banorte | $52m turnover | −0.5% | Banks slip as rate-cut expectations shift |
The most-traded names showed a clear division between exporters and domestic plays. Cemex, which has significant dollar costs and exposure to US construction, fell 3.26% with about $31m in turnover, the heaviest among major losers. On the upside, industrial developer Vesta led the whole market with a 1.8% gain, while GAP, which runs Mexican airports and benefits from domestic travel and tourism, added about 1.2%.
05 The regional scoreboard
| Index | Country | Change |
|---|---|---|
| S&P/BMV IPC | Mexico | −0.22% |
| Ibovespa | Brazil | −0.86% |
| IPSA | Chile | +0.20% |
| Merval | Argentina | −0.94% |
| COLCAP | Colombia | +0.92% |
Latin America was mixed, with Colombia’s COLCAP up 0.92% and Chile’s IPSA up 0.20%, while Brazil and Argentina slipped. Mexico’s 0.22% decline was the mildest of the regional losers.
06 The technical picture
The S&P/BMV IPC is now about 10.2% below its 52-week high of 71,601, leaving it closer to middle ground than any immediate test of key levels.
The peso, at 17.531, is 3.8% weaker than its strongest annual level of 16.89 and 6.1% stronger than its weakest, 18.68. The 17.50 marker has already given way, and a sustained move higher could open the door toward 18.00.
07 What to watch
- Banxico’s next decision: Any signal on the pace of future rate cuts will set the tone for the peso and bank stocks.
- Carry trade flows: Watch whether the narrowing US-Mexico rate gap continues to pressure the peso.
- US dollar index: Further DXY strength would weigh on Mexican assets broadly.
- Cemex and exporter stocks: A weaker peso could offer some relief to exporters with dollar revenues.
Background: Mexico’s IPC Falls 0.78% as the Peso Slips Before Banxico.
Frequently Asked Questions
What is the S&P/BMV IPC?
It is Mexico’s main stock market index, tracking the largest and most traded companies on the Bolsa Mexicana de Valores.
Why did the peso fall so sharply?
The narrow gap between US and Mexican interest rates makes peso carry trades less attractive, pushing the currency lower against the dollar.
Which stocks moved the most?
Cemex fell 2.9%, while airport operator GAP gained 1.8% and industrial developer Vesta rose 1.7%.
What should investors watch next?
The Bank of Mexico’s next interest-rate decision and any guidance on the pace of future cuts.
IPC — Market data: RT; exchange figures from BMV
This article was produced by The Rio Times’ automated newsroom system. How we use AI · Report an error
In depth
LatAm Markets: Live Signals → — real-time movers, turnover leaders and FX across Latin America.
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