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Bond prices: Why is a high yield sometimes too good to be true?
Those are the expected yields; they are not guaranteed. This was actually the bread and butter of Graham Newman, mispriced bonds.  Graham's writings in the Buffett recommended edition of Securities Analysis are invaluable to bond valuation. The highest yielder now is a private subsidiary of Société Générale.  A lack of financial statements availability and the fact that this is the US derivatives markets subsidiary are probably the cause of the higher rates. The cost is about a million USD to buy them. The rest will be similar cases, but Graham's approach could find a diamond; however, bonds are big ticket items, so one should expect to pay many hundreds of thousands of USD per trade.