Kaiser Aluminum Warrick, LLC v. US Magnesium LLC
- John Koeltl
- 1:22-cv-03105
- U.S. District Court · Southern District of New York
- 4
In Kaiser Aluminum Warrick v. US Magnesium, Judge Koeltl denied reconsideration, required nine-percent prejudgment interest, and ordered entry of Kaiser’s proposed judgment.
Kaiser Aluminum Warrick, LLC and US Magnesium, LLC. The ruling supports entry of a judgment for Kaiser that includes nine-percent prejudgment interest on the stipulated $54,983,670 cover-damages award, while leaving the earlier rejection of US Magnesium’s pass-through defense in place.
What happened
In Kaiser Aluminum Warrick, LLC v. US Magnesium, LLC, Kaiser sought entry of a judgment based on the parties’ stipulated cover-damages award of $54,983,670. US Magnesium disputed the proposed judgment.
US Magnesium asked the court to reconsider its earlier decision rejecting US Magnesium’s pass-through defense and argued that Kaiser was not entitled to nine-percent prejudgment interest. The court said the reconsideration request was late and that the damages award was a legal remedy for breach of contract, making the nine-percent interest rate mandatory under New York law.
Judge Koeltl denied US Magnesium’s motion for reconsideration and ruled that prejudgment interest must be based on the stipulated $54,983,670 cover-damages amount. The court ordered entry of Kaiser’s proposed judgment.
The detailed version
- Kaiser Aluminum Warrick, LLC v. US Magnesium LLC · No. 1:22-cv-03105
- John Koeltl
- Aug. 8, 2025
Background
Kaiser sought entry of a proposed judgment against US Magnesium based on a stipulated cover-damages award of $54,983,670. The opinion does not provide the full underlying contract dispute, but it states that the award arose from a breach-of-contract claim and that US Magnesium had asserted a pass-through defense.
The court had previously granted summary judgment striking the pass-through defense, concluding that New York law precluded it. The parties’ stipulation preserved US Magnesium’s right to appeal that decision.
US Magnesium’s Arguments
US Magnesium raised two objections to the proposed judgment. First, it asked the court to reargue its decision rejecting the pass-through defense. The court found that the motion was untimely under the Southern District of New York’s rule requiring reconsideration motions within 14 days after entry of the challenged order. It also found that US Magnesium had not shown a reason to reconsider the earlier decision.
Second, US Magnesium argued that Kaiser was not entitled to nine-percent prejudgment interest. It contended that the remedy was equitable in nature, partly because of its pass-through-defense argument. US Magnesium also argued that, if interest were awarded, it should be calculated using $29,429,066 rather than the stipulated cover-damages amount.
Court’s Reasoning
Because the case was based on diversity jurisdiction and the right to interest was treated as substantive, the court applied New York law. New York law generally requires nine-percent prejudgment interest for a breach-of-contract judgment, while allowing discretion in actions seeking equitable remedies.
The court concluded that the $54,983,670 cover-damages award was a legal remedy for breach of contract, not an equitable remedy. It therefore held that nine-percent prejudgment interest was mandatory. The court added that, even if it considered the equities, they would favor nine-percent interest based on the stipulated cover-damages amount.
Ruling
Judge John G. Koeltl denied US Magnesium’s untimely motion for reconsideration. The court also rejected US Magnesium’s arguments concerning the interest rate and the amount on which interest should be based, concluding that nine-percent prejudgment interest applied to the stipulated $54,983,670 cover-damages award. The court ordered entry of Kaiser’s proposed judgment.
Read the full 4-page opinion on CourtListener, the free public archive maintained by the Free Law Project.