Jobber — The Dollar Dictionary

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Finance

Jobber

A market maker or dealer who buys and sells securities from their own account to provide liquidity to the market, profiting from the bid-ask spread.

The jobber system was the precursor to modern market making. Today's high-frequency trading firms and electronic market makers perform essentially the same function — holding temporary inventory positions in securities and continuously quoting bid and ask prices to facilitate trading. The profit model is identical: earn the spread on each transaction while managing the inventory risk of holding positions that may move against you.

The term is primarily British and historical, but the concept is universal and vital. Without market makers willing to take the other side of trades and hold inventory, markets become illiquid — bid-ask spreads widen, prices become volatile, and investors struggle to execute transactions at fair prices. The jobber's willingness to bear inventory risk is what makes smooth market functioning possible.

A jobber is the financial equivalent of a car dealer who has inventory on the lot. They buy cars (securities) they don't personally need, hold them in inventory, and sell them to buyers at a slightly higher price than they paid. The spread between buy and sell price is their profit — and their willingness to hold inventory is what keeps the market liquid for everyone else.

Real world: Before the 'Big Bang' deregulation of London's financial markets in 1986, the Stock Exchange had a strict separation between jobbers (who made markets) and brokers (who dealt with clients). Jobbers could only trade with brokers, not directly with the public. The system ensured market liquidity but created inefficiencies that deregulation swept away, collapsing the distinction into the modern market maker model used today.

💡 A jobber provides liquidity by standing ready to buy and sell from inventory — the spread they earn is the price the market pays for always having someone willing to trade.

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