It's a BDR (receipt traded on B3) of the TLT ETF, which holds long-term US Treasury bonds. By buying BTLT39, you are lending money to the US government, in dollars, without needing an account abroad.

Why is BTLT39 doubly dollar-denominated?

Its price depends on two things simultaneously: the price of TLT in dollars and the USD/BRL exchange rate. If TLT rises, BTLT39 rises; if the dollar rises, it also rises. Since TLT and the dollar tend to move in opposite directions, one movement often offsets part of the other.

Does BTLT39 pay dividends?

Yes. The TLT distributes the interest from the bonds every month, and BTLT39 passes this on to the holder (in Brazilian reals), after taxes and the BDR issuer fee.

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Global fixed income · doubly dollar-denominated Medium risk

📊 BTLT39 — the BDR of TLT

Asset Guide · Global fixed income

BTLT39: lend to the US without leaving B3

In reals, in the world's safest credit. And it gains value in two ways: from the American bond and from the dollar.

Step by step · the US Treasury bond

When the US needs money, it borrows

The government issues a paperthe Treasury bond
It promises to pay it backand pays interest along the way
Whoever buys it, lendsmoney to the US, and collects interest for it
TLT bundles many of thema fund (ETF) with only the longest ones, 20 years or more

What it really is

From the US Treasury to your home broker

Treasury bondsthe US borrows
TLTETF with the long-bond basket, in dollars, in the US
BTLT39BDR: a receipt on B3 that represents TLT
Youbuy it in reals, just like any stock

Buying TLT directly would require an account with an American broker. In one sentence: BTLT39 = lending to the US, in dollars, without leaving the Brazilian stock exchange — and collecting interest every month.

How it's priced

Doubly dollar-denominated: two forces pull the price

The price of TLT

in dollars

TLT rises abroad, BTLT39 rises here

The USD/BRL rate

in reals

Dollar rises, BTLT39 rises — even if TLT didn't move

The detail almost nobody explains: TLT and the dollar tend to move in opposite directions.

The tug of war

One movement offsets part of the other

ScenarioDollarTLT

Normal day-to-dayrises (US rates went up)falls (higher rates push the price down)

Global stressrises (money flows to the dollar)rises (and to US bonds)

Day to day, this makes BTLT39 more stable than a purely dollar-denominated asset. In a panic, both can unlock in the same direction and the asset moves sharply — up or down, depending on the macro scenario.

The monthly dividends

The bonds' interest becomes monthly income

4% to 5%"stated" interest on long bonds, currently − coststaxes and the issuer fee = ~3%per year, in dollars

Figures per year, in dollars; the taxes you'd pay anyway. TLT distributes the income every month and BTLT39 passes it on in reals — on top of the price movement of the bond and the exchange rate. And it tends to appreciate when US interest rates fall again.

Why the risk is considered low

For you not to get paid, the entire US would have to go bankrupt

The largest economy on the planetand the largest power: the world's benchmark for safety
Where big money hidesto keep it safe: US Treasuries or gold
Safer than Tesouro Diretoit's considered safer than Brazil's own
Default: extremely unlikelyover the medium and long term; only in an extreme, very long-term scenario

Low, but not zero

The risk isn't default: it's price

Interest ratesUS rates rise, TLT falls (and vice versa): the main source of fluctuation
Currencyif the dollar weakens against the real, your position shrinks in reals
BDR issuerbuys TLTs abroad (audited) and issues the receipt 1-for-1, for a small fee: marginal, but it exists and is rarely mentioned

Where it fits in the portfolio

Defense and patience, not a bet

Where it makes sense

defensive, dollar-denominated anchor

With TLT near historic lows
An interest-rate asset usually has its best entry point during pessimism: high rates tend only to fall

Where to avoid

quick-gain bet

Long bonds suffer if rates rise further
Currency can work against you in the short term

It's a position for diversification, not concentration.

How to invest in practice

Just like buying a stock

Home brokerfrom your bank or broker
Search BTLT39the code on B3
Buy in realsno foreign account or dollar cash required
Collect every monththe interest passed on in reals

Keep this in mind

Three ideas from the guide

It's lending to the USBTLT39 is the B3 receipt for an ETF of long US Treasury bonds.
Two forces on the priceTLT in dollars and the dollar in reals — which tend to offset each other.
The risk is priceDefault is almost unthinkable; interest rates and currency are what move the price.

Quick quiz · 1 of 2

TLT stayed flat and the dollar rose. What happens to BTLT39?

It's doubly dollar-denominated. The price depends on TLT in dollars and on the USD/BRL rate: if the dollar rises, BTLT39 rises even if TLT didn't move.

Quick quiz · 2 of 2

What is the main source of BTLT39's fluctuation?

The risk is price, not default. When US rates rise, the price of TLT falls (and vice versa). Currency comes next; the BDR issuer is a marginal risk.

Guide complete

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The asset in numbers

Quick summary

Risk levelMedium

TypeGlobal fixed income

CurrencyDollar (double)

Pays income?Yes, monthly (~3% p.a.)

LiquidityHigh (B3)

Time horizonMedium/long term

Default riskVery low

Historical range (TLT, US$)

Low
~US$ 832020 High
~US$ 179

Currently near US$ 86 — close to the historic low. Historically rare for TLT to go much below this, which suggests limited downside from here.

Good time to buy?

Favorable moment

With TLT near its lows and US rates high (and more likely to fall than rise much further), the risk/reward is attractive for those entering with a medium/long-term horizon. Not a buy trigger — just context.

🎯 Channel view Is TLT worth investing in now? →

⚠️ Educational content, written for those who are learning. Not investment advice. The section on the BDR issuer is a general overview of how BDRs work — always check the product prospectus before investing.

Photo: Tony Webster, CC BY-SA 3.0, via Wikimedia Commons