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Break these “Extraordinary Events” into four categories:

Corporate events on Issuers: Corporate Events are generally benign but not always expected or even wanted adjustments to the corporate structure and management of specific underlying Shares — Tender Offers, Mergers, management buyouts and events that change the economic proposition represented by those Shares, and not the equity derivative contract. So: Merger Events and Tender Offers;

Index adjustments: For Index trades, unexpected adjustments and changes to methodologies and publishing strategies of underlying Index (as opposed to changes in the composition of the Index according to its pre-existing rules) — collectively call these “Index Adjustment Events”. So:

Index Modification: Changes in the calculation methodology for the Index

Index Cancellation: Where Indexes are discontinued with replacement;

Index Disruption: disruption in the calculation and publication of Index values;

Negative events affecting Issuers: Nationalizations, Insolvency, Delisting of underlying Issuers;

Additional Disruption Events: Events which directly impair performance and risk management of the Transaction itself. These often cross over with market- and Issuer-dependent events above, but the emphasis here is their direct impact on the parties’ abilities to perform and hedge the derivative Transaction itself. So:

The Triple Cocktail: The Triple Cocktail of Change in Law, Hedging Disruption and Increased Cost of Hedging;

Stock borrow events: Specific issues relating to short-selling (Loss of Stock Borrow and Increased Cost of Stock Borrow); and

Random ones that aren’t needed or used: Two random ones that don’t brilliantly fit with this theory, and which people tend to disapply — possibly for that exact reason, but they are fairly well covered by the Triple Cocktail anyway — Failure to Deliver under the Transaction on account of illiquidity and, even more randomly, Insolvency Filing.