Exhibit 99.1

The table below specifies the date, quantity, weighted-average sale price and range of price per share of Class B common stock of Berkshire Hathaway Inc. sold by Bill & Melinda Gates Foundation Trust (the “Trust”) during the past sixty days.  The Trust undertakes to provide upon request by the staff of the Securities and Exchange Commission full information regarding the number of shares sold at each separate price.  All of the transactions were effected on the New York Stock Exchange or through Electronic Communication Networks.

Trade Date	Quantity Sold	Weighted-Average Price Per Share Sold ($)	Range of Price ($)
11/14/2011	80,500	75.9243	75.5250 – 76.4900
11/15/2011	67,635	76.0074	75.3350 – 76.3300
11/15/2011	12,865	76.3973	76.3350 – 76.5200
11/16/2011	59,489	75.1936	74.5800 – 75.5750
11/16/2011	21,011	75.7319	75.5800 – 75.9300
11/17/2011	54,900	74.1921	73.9200 – 74.9100
11/17/2011	25,600	75.4174	74.9200 – 75.6500
11/18/2011	80,500	75.2953	74.7900 – 75.6000
11/21/2011	80,500	74.4679	74.0800 – 74.8900
11/22/2011	80,500	74.6526	74.3450 – 75.2550
11/23/2011	80,500	73.2759	72.8200 – 73.5200
11/25/2011	80,500	73.1137	72.7900 – 73.4400
11/28/2011	80,500	75.1235	74.8350 – 75.4400
11/29/2011	80,500	75.3984	75.1200 – 75.7100
11/30/2011	45,000	77.4077	76.9600 – 77.9200
11/30/2011	35,500	78.4375	78.1500 – 78.7900
12/01/2011	80,500	77.7375	77.4200  – 78.0600
12/2/2011	70,000	77.6742	77.3450 – 78.1600
12/02/2011	10,500	78.5268	78.4500 – 78.8900
12/05/2011	47,393	77.7382	77.2450 – 78.2400
12/05/2011	33,107	78.4304	78.2500 – 78.7700
12/06/2011	46,963	77.9653	77.2800 – 78.2700
12/06/2011	33,537	78.4868	78.2800 – 78.7800
12/07/2011	66,880	77.4503	77.0300 – 78.0200
12/07/2011	13,620	78.6043	78.0300 – 78.8900
12/08/2011	76,987	77.2399	76.6950 – 77.6900
12/08/2011	3,513	77.8280	77.7000 – 77.9300
12/09/2011	80,500	77.6550	77.2600 – 77.9900
12/12/2011	80,500	76.0974	75.7300 – 76.4300
12/13/2011	57,200	75.4250	75.0400 – 75.7400
12/13/2011	23,300	76.3310	76.1300 – 76.8300
12/14/2011	80,500	75.6469	75.3000 – 76.1000
12/15/2011	77,000	75.1108	74.8600 – 75.4600

Trade Date	Quantity Sold	Weighted-Average Price Per Share Sold ($)	Range of Price ($)
12/15/2011	1,000	76.3000
12/16/2011	73,600	75.0093	74.6600 – 75.3800
12/19/2011	61,500	74.1127	73.7650 – 74.7600
12/19/2011	12,100	75.1231	74.7650 – 75.2900
12/20/2011	47,900	75.5308	75.0000 – 75.9950
12/20/2011	25,700	76.1439	76.0000 – 76.4200
12/21/2011	73,600	75.9360	75.5600 – 76.1800
12/22/2011	73,600	76.3756	75.9050 – 76.7300
12/23/2011	73,600	77.4136	76.9000 – 77.7700
12/27/2011	73,600	77.3237	77.1200 – 77.9200
12/28/2011	73,600	76.5811	76.3950 – 77.0500
12/29/2011	73,600	76.6248	76.3400 – 76.8500
12/30/2011	73,600	76.4917	76.3650 – 76.7000
1/3/2012	80,000	77.9003	77.6750 – 78.2700
1/4/2012	80,000	76.8727	76.6800 – 77.1500
1/5/2012	74,100	76.6835	76.0500 – 77.0450
1/5/2012	5,900	77.0719	77.0500 – 77.1200
1/6/2012	80,000	76.5173	76.3250 – 76.8400
1/9/2012	80,000	76.1156	75.9800 – 76.3000
1/10/2012	80,000	77.2489	76.9000 – 77.5000
1/11/2012	80,000	77.7279	77.1000 – 78.0300
1/12/2012	80,000	78.2023	77.8400 – 78.4800