n. The severe overheating of a market that causes prices to rise to unprecedented levels. Also: meltup. (cf. meltdown).

Example Citation:
You hear more or less serious arguments these days that earnings don't count, that interest rates are irrelevant, that the macro backdrop is a distraction. Otherwise erudite observers use the phrase "melt-up" in their analyses. Melt-up? It can't be a well thought-out market if it is represented by so unlikely an image.
—Jim Griffin, "Top Heavy,", December 19, 1999

Earliest Citation:
In the final analysis, we might find tactical asset allocation (with futures) creates futures-driven markets just as portfolio insurance did (in combination with index arbitrage). While the market was vulnerable to a "meltdown" in the summer of 1987, however, it might be vulnerable to a "meltup" in the period ahead when this tactical asset allocation tidal wave responds to signals to increase equity exposure.
—David B. Bostian Jr, "Other views," Pensions & Investment Age, October 17, 1988

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