Reinsurance Ceded	9 Months Ended
Sep. 30, 2016
Reinsurance Ceded	4. Reinsurance Ceded *(a) Overview* Alleghany’s reinsurance and insurance subsidiaries reinsure portions of the risks they underwrite in order to reduce the effect of individual or aggregate exposure to losses, manage capacity, protect capital resources, reduce volatility in specific lines of business, improve risk-adjusted portfolio returns and enable them to increase gross premium writings and risk capacity without requiring additional capital. Alleghany’s reinsurance and insurance subsidiaries purchase reinsurance and retrocessional coverages from highly-rated third-party reinsurers. If the assuming reinsurers are unable or unwilling to meet the obligations assumed under the applicable reinsurance agreements, Alleghany’s reinsurance and insurance subsidiaries would remain liable for such reinsurance portion not paid by these reinsurers. As such, Alleghany’s reinsurance and insurance subsidiaries reinsure portions of the risks they underwrite or assume with multiple reinsurance programs, and funds, trust agreements and letters of credit are held to collateralize a portion of their reinsurance recoverables. *(b) Significant Reinsurance Contracts* As discussed in Note 5(d) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2015 Form 10-K, RSUI reinsures its property lines of business through a program consisting of surplus share treaties, facultative placements, per risk and catastrophe excess of loss treaties. RSUI’s catastrophe reinsurance program and property per risk reinsurance program run on an annual basis from May 1 to the following April 30 and portions expired on April 30, 2016. RSUI’s catastrophe reinsurance program covers catastrophe risks including, among others, windstorms and earthquakes. Portions of the catastrophe reinsurance program include multi-year terms, some of which were entered into in 2014. As of September 30, 2016, the catastrophe reinsurance program consisted of three layers, with portions of the first two layers placed on May 1, 2015 and May 1, 2016 and portions of the third layer placed on May 1, 2014 and May 1, 2016. The portions of the program expiring on April 30, 2016 were renewed on May 1, 2016. The catastrophe reinsurance program provides coverage for $600.0 million of losses in excess of a $200.0 million net retention after application of surplus share treaties and facultative reinsurance. The first layer provides coverage for $300.0 million of losses, subject to a 5.0 percent co-participation by RSUI in excess of $200.0 million, the second layer provides coverage for $100.0 million of losses in excess of $500.0 million, with no co-participation by RSUI, and the third layer provides coverage for $200.0 million of losses in excess of $600.0 million, with no co-participation by RSUI. The first and second layers of coverage include the following expiration terms: approximately 34 percent of coverage limits, which originally expired on April 30, 2016 and was renewed May 1, 2016, currently expires on April 30, 2019; approximately 33 percent of coverage limits expire on April 30, 2017; and approximately 33 percent of coverage limits expire on April 30, 2018. The third layer of coverage originally expired on April 30, 2017. However, effective May 1, 2016 approximately 39 percent of the third layer of coverage was cancelled and replaced with the same coverage for a three year period expiring on April 30, 2019. The remaining coverage limits expire on April 30, 2017. In addition, RSUI’s property per risk reinsurance program runs on an annual basis from May 1 to the following April 30 and thus expired on April 30, 2016. On May 1, 2016, the property per risk program was renewed and will expire on April 30, 2017. For the 2016 to 2017 period, RSUI’s property per risk reinsurance program provides coverage for $90.0 million of losses, subject to a 10.0 percent co-participation by RSUI, in excess of a $10.0 million net retention per risk after application of surplus share treaties and facultative reinsurance.

Reinsurance Ceded

9 Months Ended

Sep. 30, 2016

4. Reinsurance Ceded

(a) Overview

Alleghany’s reinsurance and insurance subsidiaries reinsure portions of the risks they underwrite in order to reduce the effect of individual or aggregate exposure to losses, manage capacity, protect capital resources, reduce volatility in specific lines of business, improve risk-adjusted portfolio returns and enable them to increase gross premium writings and risk capacity without requiring additional capital. Alleghany’s reinsurance and insurance subsidiaries purchase reinsurance and retrocessional coverages from highly-rated third-party reinsurers. If the assuming reinsurers are unable or unwilling to meet the obligations assumed under the applicable reinsurance agreements, Alleghany’s reinsurance and insurance subsidiaries would remain liable for such reinsurance portion not paid by these reinsurers. As such, Alleghany’s reinsurance and insurance subsidiaries reinsure portions of the risks they underwrite or assume with multiple reinsurance programs, and funds, trust agreements and letters of credit are held to collateralize a portion of their reinsurance recoverables.

(b) Significant Reinsurance Contracts

As discussed in Note 5(d) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2015 Form 10-K, RSUI reinsures its property lines of business through a program consisting of surplus share treaties, facultative placements, per risk and catastrophe excess of loss treaties. RSUI’s catastrophe reinsurance program and property per risk reinsurance program run on an annual basis from May 1 to the following April 30 and portions expired on April 30, 2016.

RSUI’s catastrophe reinsurance program covers catastrophe risks including, among others, windstorms and earthquakes. Portions of the catastrophe reinsurance program include multi-year terms, some of which were entered into in 2014. As of September 30, 2016, the catastrophe reinsurance program consisted of three layers, with portions of the first two layers placed on May 1, 2015 and May 1, 2016 and portions of the third layer placed on May 1, 2014 and May 1, 2016. The portions of the program expiring on April 30, 2016 were renewed on May 1, 2016. The catastrophe reinsurance program provides coverage for $600.0 million of losses in excess of a $200.0 million net retention after application of surplus share treaties and facultative reinsurance. The first layer provides coverage for $300.0 million of losses, subject to a 5.0 percent co-participation by RSUI in excess of $200.0 million, the second layer provides coverage for $100.0 million of losses in excess of $500.0 million, with no co-participation by RSUI, and the third layer provides coverage for $200.0 million of losses in excess of $600.0 million, with no co-participation by RSUI. The first and second layers of coverage include the following expiration terms: approximately 34 percent of coverage limits, which originally expired on April 30, 2016 and was renewed May 1, 2016, currently expires on April 30, 2019; approximately 33 percent of coverage limits expire on April 30, 2017; and approximately 33 percent of coverage limits expire on April 30, 2018. The third layer of coverage originally expired on April 30, 2017. However, effective May 1, 2016 approximately 39 percent of the third layer of coverage was cancelled and replaced with the same coverage for a three year period expiring on April 30, 2019. The remaining coverage limits expire on April 30, 2017.

In addition, RSUI’s property per risk reinsurance program runs on an annual basis from May 1 to the following April 30 and thus expired on April 30, 2016. On May 1, 2016, the property per risk program was renewed and will expire on April 30, 2017. For the 2016 to 2017 period, RSUI’s property per risk reinsurance program provides coverage for $90.0 million of losses, subject to a 10.0 percent co-participation by RSUI, in excess of a $10.0 million net retention per risk after application of surplus share treaties and facultative reinsurance.

- Definition

The entire disclosure pertaining to the existence, magnitude and information about insurance that has been ceded to or assumed from another insurance company, including the methodologies and assumptions used in determining recorded amounts.

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