Memorandum of Understanding/MOU
A memorandum of understanding, or MOU, is a written statement in which two or more parties lay out what they have agreed to in principle before any final, legally binding contract is signed. Think of it as a handshake put on paper: it says "here is what we both think we've agreed to," without locking anyone into the full legal obligations a formal contract would create.
In practice, an MOU spells out the broad shape of a deal — who is involved, what each side intends to do, and roughly on what terms — while leaving the fine print, exact numbers, and enforceable commitments to a later contract, merger agreement, or regulatory filing. Companies, governments, and regulators use them constantly, for example when two firms announce they intend to merge, partner, or share data, or when a regulator and an exchange agree on how they'll cooperate.
The nuance that trips people up: an MOU is generally not legally binding in the way a signed contract is, so it does not guarantee the deal will actually happen. Either side can usually walk away, terms can change, and financing or regulatory approval can still fall through. For a trader, seeing "MOU signed" in a headline should read as "a deal is more likely now" rather than "a deal is done."
This term shows up in trading mostly through corporate news — a company announces an MOU with a supplier, a potential acquirer, or a foreign government — and traders react to the announcement as a piece of information, not as a settled fact.
Day traders watch for MOU headlines because they often trigger sharp, fast moves in a stock's price on speculation alone, even though the underlying deal is not yet binding and can still collapse — which makes the resulting price move prone to reversal.
A small biotech's stock jumps 18% premarket after it announces an MOU with a larger pharmaceutical company to "explore a potential licensing partnership." A day trader who buys the spike is trading the headline and the momentum, not a finished deal — if the two companies later fail to convert the MOU into a signed licensing agreement, the stock can give back the gain just as quickly.
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