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An upstream supplier that is constrained both by downstream competition and the threat of demand-side substitution faces a tradeoff between maximizing joint-profit and extracting surplus. Although joint-profit maximization calls for relatively high marginal wholesale prices in order to dampen intra-brand competition, surplus extraction will be higher when the supplier instead charges relatively low marginal wholesale prices. The reason is that by inducing more intra-brand competition through lower wholesale prices, the supplier makes it less attractive for downstream firms to switch to alternative sources of supply. We show how this can make it optimal for the supplier to disadvantage more efficient and thus ultimately larger buyers, thereby smoothing out differences in their market shares. We further show that despite the use of non-linear supply contracts, marginal wholesale prices and thus final goods’ prices will decrease when either downstream competition intensifies or the supplier becomes more constrained by the threat of demand-side substitution.