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 period January 24 through March 26, 2013.   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.

Date of Transaction	Number of Shares of Common Stock Sold	Weighted-Average Price Paid Per Share ($)	Range of Price Paid Per Share ($)
3/26/2013	104,100	102.8500 - 103.8300	103.4609
3/25/2013	92,637	101.9450 - 102.9400	102.4121
3/25/2013	11,463	102.9600 - 103.2000	103.1110
3/22/2013	104,100	101.9700 - 102.6900	102.3173
3/21/2013	104,100	101.9550 - 102.5500	102.2299
3/20/2013	104,100	101.8800 - 102.5600	102.1641
3/19/2013	99,300	101.3150 - 102.3100	101.7558
3/19/2013	4,800	102.3150 - 102.5100	102.4057
3/18/2013	104,100	101.9250 - 102.8500	102.4392
3/15/2013	104,100	102.8700 - 103.6500	103.3539
3/14/2013	104,100	103.5900 - 104.0100	103.8277
3/13/2013	104,100	103.0650 - 103.6800	103.4052
3/12/2013	85,600	102.2500 - 103.2400	102.9030
3/12/2013	18,500	103.2500 - 103.6000	103.4531
3/11/2013	104,100	103.4150 - 104.0750	103.7439
3/8/2013	104,100	103.1050 - 103.8400	103.5344
3/7/2013	104,100	103.0350 - 103.4800	103.3093
3/6/2013	104,100	102.7900 - 103.3700	103.1247
3/5/2013	104,100	102.5900 - 103.4500	102.9554
3/4/2013	64,715	100.5150 - 101.5000	100.8481
3/4/2013	39,385	101.5300 - 101.8600	101.7200
3/1/2013	44,436	100.8700 - 101.8650	101.4366
3/1/2013	59,664	101.8700 - 102.2500	102.0534
2/28/2013	104,100	101.3600 - 102.3150	101.8733
2/27/2013	15,702	98.6100 -   99.6000	99.1952
2/27/2013	43,277	99.6100 - 100.5900	100.0773
2/27/2013	45,121	100.6150 - 101.2700	101.0512
2/26/2013	103,000	98.3300 -   99.3100	98.7354
2/26/2013	1,100	99.3500 -   99.4350	99.3732
2/25/2013	26,790	98.4600 -   99.4500	98.9299
2/25/2013	41,928	99.4600 - 100.4500	99.9495
2/25/2013	27,808	100.4600 - 101.4550	101.0193
2/25/2013	7,574	101.4600 - 101.6300	101.5191
2/22/2013	103,900	100.2500 - 101.2400	100.7057
2/22/2013	200	101.2500 - 101.2700	101.2600
2/21/2013	104,100	99.7500 - 100.5300	100.1910
2/20/2013	53,331	100.0300 - 101.0250	100.5214
2/20/2013	50,769	101.0400 - 101.4400	101.2105
2/19/2013	99,866	99.8900 - 100.8850	100.5246
2/19/2013	4,234	100.8900 - 101.0700	100.9297
2/15/2013	104,100	99.2600 -   99.6850	99.4783
2/14/2013	81,070	98.1300 -   99.1250	98.8996
2/14/2013	23,030	99.1300 -   99.2900	99.1854

2/13/2013	104,100	97.5950 - 98.1800	97.8913
2/12/2013	104,100	97.0850 - 97.9800	97.6321
2/11/2013	104,100	97.0400 - 97.5000	97.2069
2/8/2013	104,100	96.7500 - 97.2800	97.0387
2/7/2013	104,100	97.0500 - 97.9300	97.2857
2/6/2013	104,100	97.3300 - 97.8400	97.5659
2/5/2013	104,100	97.0700 - 98.0350	97.5776
2/4/2013	101,400	96.3950 - 97.3800	96.8645
2/4/2013	2,700	97.4250 - 97.6700	97.5809
2/1/2013	75,438	97.4650 - 98.4600	98.0867
2/1/2013	28,662	98.4650 - 98.9700	98.6721
1/31/2013	104,100	96.3050 - 96.9600	96.6215
1/30/2013	104,100	96.4550 - 97.0150	96.7515
1/29/2013	104,100	96.9850 - 97.3100	97.1692
1/28/2013	104,100	96.7550 - 97.5100	97.1772
1/25/2013	104,100	96.8400 - 97.6800	97.2489
1/24/2013	98,842	96.5900 - 97.5800	97.1301
1/24/2013	5,258	97.5900 - 97.7100	97.6182