📊 BTLT39 — the BDR of TLT
The simplest way to lend money to the United States government — the world's safest credit — right here on B3, in Brazilian reals. An asset that gains value in two ways at the same time: from the American bond and from the dollar.
📘 What it really is
Let's take it step by step, because this is one of the assets that confuses beginners the most.
When the US government needs money, it does what any government does: it borrows. It issues a piece of paper called a Treasury bond and promises to return the value in the future while paying interest along the way. Whoever buys that paper is, in practice, lending money to the US and receiving interest for it.
The TLT is a fund (ETF) that bundles many of those bonds — only the longest-dated ones, 20 years or more. Instead of buying one bond at a time, you buy a share of TLT and instantly get exposure to a whole basket of them.
But TLT is traded in the United States, in dollars. To buy it directly you'd need to open an account with an American broker. BTLT39 solves that: it's a BDR — a receipt traded here on the Brazilian stock exchange (B3) that represents TLT abroad. You buy it through your bank's home broker, in reals, just like any stock.
BTLT39 = lending money to the US, in dollars, without leaving the Brazilian stock exchange — and still collecting interest every month.
⚙️ How it's priced (the important part)
BTLT39 is doubly dollar-denominated. It's not just "a dollar-denominated asset" — its price depends on two things at the same time:
- The price of TLT in dollars. If TLT rises abroad, BTLT39 rises here.
- The USD/BRL exchange rate. If the dollar rises, BTLT39 rises — even if TLT didn't move.
In other words: both "pull" the price. And here's the detail almost nobody explains — TLT and the dollar tend to move in opposite directions.
When the world enters stress, money flows to the dollar (dollar rises) and to US bonds (TLT rises) — in that case, both push BTLT39 up at once. But in normal day-to-day conditions, when the dollar rises it's usually because US rates have risen — and higher rates push the price of TLT down. One movement offsets part of the other.
This "tug of war" makes BTLT39 more stable than a purely dollar-denominated asset. On the flip side, there are panic scenarios where both unlock in the same direction and the asset moves sharply — up or down, depending on the macro scenario.
💰 The monthly dividends
Remember that buying a Treasury bond means lending money and collecting interest? Those interest payments become dividends. TLT distributes the bond income every month, and BTLT39 passes that on to you, in reals.
The "stated" interest on long US bonds currently hovers around 4% to 5% per year in dollars. For the BDR holder, after deducting taxes (which you'd pay anyway) and the issuer fee, what ends up in your account is around ~3% per year in dollars — on top of the price movement of the bond and the exchange rate.
To sum up the package: you get a dollar-denominated asset that pays monthly income and tends to appreciate when US interest rates fall again.
🛡️ Why the risk is considered low (but not zero)
There's a reason the US Treasury is the world's benchmark for safety: for you not to get paid, the entire United States would have to go bankrupt — the largest economy and the largest power on the planet. Those with lots of money who just want to keep it safe go to two places: US Treasuries or gold. It's considered safer than Brazil's own Tesouro Direto.
Over the medium and even long term, the probability of default is extremely low. The risk here isn't default risk — it's price risk:
- Interest rate risk. If US rates rise, the price of TLT falls (and vice versa). This is the main source of fluctuation.
- Currency risk. If the dollar weakens against the real, your position shrinks in real terms.
- BDR issuer risk. Behind BTLT39 is an institution that buys TLTs abroad (audited) and issues the receipt here, 1-for-1, charging a small fee. It's a risk we treat as marginal, but it exists and is rarely mentioned.
✓ Where it makes sense
As a defensive, dollar-denominated anchor in the portfolio, especially with TLT near historic lows — the best entry point for an interest-rate asset is usually during pessimism, when rates are high and can only fall.
✗ Where to avoid
Don't treat it as a quick-gain bet. Long bonds suffer if rates rise further, and currency can work against you in the short term. It's a position for diversification and patience, not concentration.
🛒 How to invest in practice
Buyable directly through your bank or broker's home broker with the code BTLT39, in reals — just like buying a stock. No foreign account or dollar cash required.