Why Colombia's Central Bank Is Fighting Its Own Currency

Tomorrow, Colombia swears in a new president without the old one in the room. Gustavo Petro is boycotting the inauguration of his successor, Abelardo de la Espriella, whose victory he still calls a fraud. Days before the handover, a bomb outside a police station injured eleven people. There is, as of this writing, an open dispute about the basic choreography of transferring power in Latin America's third-largest economy.

You would expect the currency of a country in this condition to be trading with a risk discount. Instead, the Colombian peso is one of the best-performing currencies in the world — up roughly 15% against the dollar this year and more than 23% over the past twelve months. The rally has been so relentless that on July 31, Colombia's central bank did something remarkable: it started buying dollars to lean against its own currency.

That is the story worth understanding this week — not because Colombia is large in global portfolios, but because it is the purest expression of the biggest trade in emerging markets right now, at the exact moment a central bank decided the trade had gone too far.

The rally nobody in Bogotá asked for

The peso's strength is not a verdict on Colombia's fundamentals. Bancolombia's research unit — hardly a hostile witness — published a fair-value analysis arguing the currency has detached from them. Using a structural model that decomposes the exchange rate into global, local, and speculative components, the bank puts fair value at 3,710–3,880 pesos per dollar. The currency has recently traded near 3,335 — roughly 10% stronger than the bank's own math says it should be.

Two forces closed that gap from the wrong side. The first is politics: markets began repricing Colombian assets the moment a market-friendly successor to Petro looked plausible. Bancolombia calls it the trade electoral. Colombia's five-year credit default swaps fell 69 basis points after the first round of the presidential vote and now sit below the level the bank considers consistent with fundamentals. The optimism trade overshot the optimism.

The second is carry. With the policy rate at 12% — among the highest in the region — and US rates far below, the gap between the price of money in Bogotá and the price of money in New York has widened to 8.4 percentage points. Borrow dollars, buy pesos, collect the spread: as long as the peso doesn't fall, it is one of the most profitable currency trades on earth, and it has been crowding in capital for months. The rally feeds the trade, and the trade feeds the rally.

There were also one-off flows that won't repeat: Colombia's finance ministry sold roughly $9 billion of foreign currency into the market late last year — including a direct placement to Pimco that raised about $5 billion — in a market where average daily spot volume runs around $1.3 billion. That is a lot of artificial dollar supply for a market that size.

July 31: the double surprise

Against this backdrop, the central bank's board met on July 31 and surprised the market twice in one afternoon. It held the benchmark rate at 12% when a hike was expected — even though its own technical staff had just revised 2026 inflation projections up from 6.4% to 6.9%. And it announced a program to accumulate up to $4 billion in international reserves.

Officially, this is not intervention. The bank's own FAQ explicitly denies the program aims to influence the exchange rate, framing it instead as precautionary insurance: Colombia's reserve adequacy score under the IMF's methodology has slipped to about 1.14, near the bottom of the recommended range, and the program would lift total reserves from roughly $67 billion to nearly $74 billion. All true. Also convenient. As the dean of economics at Universidad de los Andes put it, part of the strategy is undeniably to combat the appreciation — the bank simply cannot say so without casting doubt on the floating-rate regime it has defended since 1999.

The mechanics tell you how carefully this is calibrated. Rather than buying dollars outright, the bank auctions put options that give commercial banks the right to sell it dollars — but only on days when the exchange rate trades below its 20-day moving average. It is a dollar bid that only activates when the peso is strengthening. A soft floor, denied three times before the rooster crows.

The first auction, on August 3, was a tell in itself: $400 million on offer, $877.5 million in bids from 37 institutions. The peso promptly fell more than 2%, with intraday drops exceeding 4%.

And then, within three days, the rally resumed. By August 6, the peso was back on the offensive — Bloomberg's headline said it plainly: the peso is defying the central bank's bid to halt the carry-fueled rally. Round one to the crowd.

So here is the setup: the most crowded carry trade in Latin America, a currency 10% through its own bankers' fair-value estimate, a central bank quietly building a dollar bid it refuses to call intervention, inflation drifting the wrong way, oil — still Colombia's fiscal spine — down roughly a quarter from its wartime peak, and a presidential handover happening tomorrow under a fraud claim and a boycott. When a central bank tells you a trade is too crowded and the market keeps pressing it anyway, one of them is about to be wrong. The question that pays is: which one, when, and what does the exit look like?

The rest of this briefing is for paid members: the carry math that shows why the trade's cushion no longer covers its risk, the three dated catalysts — including the September board meeting nobody is pricing — the three scenario zones from 3,250 to 3,700+, and the positioning framework with the weekly tell that reveals when the central bank's floor goes dead.

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