What’s the prospect of bonds doing well ?
By right FOMC cut rates is good for bonds, but ETF like TLT keep decreasing in value
So I don't know why this dude got banned, but this question has been coming up a lot (usually in the form of "the Fed cut rates, so why aren't mortgage rates coming down?", which is basically the same question) - so it's worth an answer. (Separately, BBCW is right: if you're posting on this board, you probably shouldn't own TLT in the first place!)
The answer is that Fed Funds (the rate the Fed controls) and bond yields are connected, but they're not the same thing. Fed Funds is the interest rate for overnight loans; but as BBCW and Fr33 pointed out above, TLT owns bonds that mature in twenty to thirty years, which is a lot of overnights.
And generally, the way to think about (government) bond yields is that long-dated bonds - like 20s and 30s - reflect not just the current level of Fed Funds, but also the forecast path of the current hiking or cutting cycle, and also where people think long-term economic growth is going to land. (stronger economy = more growth = higher yields; this is why Japanese long bonds traded at infinitesimally low yields throughout the nineties and 2000s).
Now, for this next paragraph, remember we're talking about the US here, not about Singapore. Different countries; different economies.
The second point is the key here—the forecast path of the current hiking or cutting cycle. Before the September Fed meeting, the market was all bulled up expecting a long, aggressive series of interest rate cuts; the market was pricing for cuts all the way down below 2% in Fed Funds. After that September meeting, US economic data started coming in stronger (strong October NFP, slightly hotter inflation), and the market changed its mind: folks realized that the Fed would probably not cut as aggressively, or for as long, as they were originally expecting.
And that's why we got this confusing price action in US bond funds like TLT. The Fed cut rates, yes; but they're probably not going to cut as fast or as hard as we thought they would. That means higher yields for bonds, and lower prices, which is why US bond funds have weakened a bit.
(The question is whether it will go any further. You could make a case that current yields—bond markets are closed today, but US 30s closed on Friday at 4.41%—are pretty decent: 50bps higher than a month ago, and 200bps above inflation, is a reasonable payoff by most metrics.)