**Insured:** INTERNATIONAL BUSINESS MACHINES CORPORATION  
**Policy No.:** XLUMB-00704  
**Endorsement No.:** 11  
**Effective Date:** MAY 21, 1997  

**Page 1 of 4**

**CHANGE OF LIMIT, RETENTION AND/OR RETROACTIVE COVERAGE DATE ENDORSEMENT**

1. It is hereby agreed that, in consideration of the premium (or premium refund) stated below, as of the effective date listed above ("Effective Date"), Items 2(a) and (b) and 4 of the Declarations shall be amended as indicated below:

**Item 2 Limits of Liability:**

| Layer | Per Occurrence Limit | Per Occurrence Retention |
|-------|----------------------|-------------------------|
| 1     | 100% part of $175,000,000 excess of | $170,000,000 |
| Total | $175,000,000          |                         |

**(b)**

| Layer | Annual Aggregate: |
|-------|--------------------|
| 1     | $175,000,000       |

**Item 4 Retroactive Coverage Date:**

| Layer | Effective Date      |
|-------|---------------------|
| May 21, 1990 | $75,000,000-xs-$170,000,000 |
| May 21, 1986 | $100,000,000-xs-$245,000,000 |

*Note: Retroactive date of May 15, 1990 for Pollution Coverage only and became effective May 21, 1991.*

Ref: XS4-126.01  
Cont’d...