Time on Your Side? Analyzing the New York-London Copper Futures Connection

As the clock struck midnight in London, traders across the pond prepared for another day of trading. Meanwhile, thousands of miles away in New York City, their counterparts were just wrapping up their day. This daily dance between two global financial hubs raises an intriguing question: Can traders on the Comex exchange leverage LME settlement prices to assist in pricing copper futures and options? Let's delve into this fascinating analysis.

The Tale of Two Cities

London and New York, separated by a time difference of roughly five hours, have long been the twin pillars of global finance. The London Metal Exchange (LME) and the Comex division of the New York Mercantile Exchange (NYSE Arca) are two of the world's most prominent metals exchanges. With copper being one of the most traded commodities on both platforms, it's natural to explore potential correlations between their pricing dynamics.

From May 1 through September 30, 2009, the average difference between the opening Comex price for December 2009 copper futures and the three-month copper settlement price on LME was a modest plus 1.51¢. However, this figure belies some significant daily fluctuations, with the greatest differences reaching as high as plus 9.42¢ on August 17 and as low as minus 7.46¢ on September 30.

The Correlation Between Comex Open & LME Settlement

To understand if these price differentials have any predictive value for traders, we ranked the daily differences between the opening Comex price and London settlement price in ascending order alongside the gains or losses in the Comex price on the same day. The resulting scatter chart reveals a negative relationship: when the opening difference is positive (indicating that Comex prices are higher than LME), the subsequent change in the Comex price tends to be negative, all else being equal.

However, there's an interesting quirk in this relationship. When the opening Comex-LME difference is negative, most daily price changes on Comex are positive, with a cumulative net gain of $4,737.50 for long futures positions. Conversely, when the opening difference is greater than 0.50¢, most daily Comex copper futures price changes are negative, resulting in a cumulative net gain of $2,072.50 from short sales.

The Mechanics Behind the Scenes

Electronic trading operates around the clock, with telephone trades also occurring during off-hours. Thus, the price differences observed between London and New York are approximations rather than exact measures of real-time variations experienced by traders on each exchange. Moreover, the sample period analyzed may not be representative of typical market conditions due to its high proportion (55%) of large positive or negative Comex-LME opening price differentials.

One potential advantage for LME traders is price discovery in copper options trading. LME members quote options over-the-counter and hedge their positions on the exchange through futures contracts. By consulting lists of strike prices and corresponding put and call options available through Comex and other market data sources, LME members and their clients can better manage their hedging strategies.

For instance, on October 2, 2009, with copper futures priced at $2.6815 per pound, the following option prices were observed:

| Strike Price | Put Option Price | Call Option Price | | --- | --- | --- | | 24000 | 175.00 | 325.00 | | ... | ... | ... | | 28000 | 675.00 | 925.00 |

Portfolio Implications & Investment Strategies

The analysis above suggests that investors might benefit from incorporating the opening price differential between Comex and LME into their trading strategies for copper futures and options. Here are some considerations across different risk profiles:

- Conservative: Limit trading activity to periods when the opening differential is low (<0.50¢) to minimize potential losses. - Moderate: Implement a hedging strategy that combines long positions on Comex with short positions on LME when the opening differential favors one exchange over another. - Aggressive: Leverage the negative relationship between opening price differentials and subsequent price changes by taking strategic long or short positions based on the daily opening spread.

Practical Implementation & Timing Considerations

To apply this analysis, investors should:

1. Monitor the opening price difference between Comex and LME copper futures. 2. Establish trading positions based on the observed relationship between opening differentials and subsequent price changes. 3. Adjust positions throughout the day as needed to capitalize on any observed trends.

However, investors must be mindful of transaction costs, market liquidity, and potential slippage when executing trades across different exchanges during off-hours.

Final Thoughts: Acting on Insights

In conclusion, our analysis demonstrates that there's a correlation between the opening price differential between Comex and LME copper futures and subsequent price changes on Comex. While this relationship is not perfect, it offers investors an additional tool for making informed trading decisions in the global copper market.

Based on this analysis, here are three actionable steps readers can take:

1. Stay Informed: Monitor opening price differentials between Comex and LME copper futures daily. 2. Consider Hedging Strategies: Leverage the observed relationship to implement strategic hedging positions across both exchanges. 3. Be Disciplined: Stick to your trading plan, adjusting positions as needed based on real-time market conditions.