Relational Investors SC 13D TIMKEN / RELATIONAL INVESTORS ownership change

Exhibit A

Transactions by Reporting Persons in the last 60 days.

Beneficial Ownership	Purchase or Sale	Quantity	Transaction Date	Price per Share (including commission)		How Effected
Relational Investors Mid-Cap Fund I, L.P.	Purchase	68,483	9/20/2012	$	39.48	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	69,764	9/20/2012	$	39.63	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	36,815	9/20/2012	$	39.48	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	37,503	9/20/2012	$	39.63	Open Market
Relational Investors LLC	Purchase	11,205	9/20/2012	$	39.48	Open Market
Relational Investors LLC	Purchase	11,414	9/20/2012	$	39.63	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	58,782	9/21/2012	$	40.01	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	176,346	9/21/2012	$	39.97	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	31,600	9/21/2012	$	40.01	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	94,800	9/21/2012	$	39.97	Open Market
Relational Investors LLC	Purchase	9,618	9/21/2012	$	40.01	Open Market
Relational Investors LLC	Purchase	28,854	9/21/2012	$	39.97	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	124,800	9/24/2012	$	39.27	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	67,090	9/24/2012	$	39.27	Open Market
Relational Investors LLC	Purchase	20,419	9/24/2012	$	39.27	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	117,561	9/25/2012	$	37.90	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	63,202	9/25/2012	$	37.90	Open Market
Relational Investors LLC	Purchase	19,237	9/25/2012	$	37.90	Open Market
California State Teachers’ Retirement System	Purchase	900	9/28/2012	$	37.22	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	28,768	10/2/2012	$	37.38	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	17,771	10/2/2012	$	37.38	Open Market
Relational Investors LLC	Purchase	3,461	10/2/2012	$	37.38	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	47,553	10/3/2012	$	38.07	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	28,768	10/3/2012	$	37.99	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	29,375	10/3/2012	$	38.07	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	17,771	10/3/2012	$	37.99	Open Market

Relational Investors LLC	Purchase	5,721	10/3/2012	$	38.07	Open Market
Relational Investors LLC	Purchase	3,461	10/3/2012	$	37.99	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	1,220	10/4/2012	$	38.50	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	753	10/4/2012	$	38.50	Open Market
Relational Investors LLC	Purchase	146	10/4/2012	$	38.50	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	47,494	10/5/2012	$	39.32	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	11,508	10/5/2012	$	39.30	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	29,339	10/5/2012	$	39.32	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	7,108	10/5/2012	$	39.30	Open Market
Relational Investors LLC	Purchase	5,714	10/5/2012	$	39.32	Open Market
Relational Investors LLC	Purchase	1,384	10/5/2012	$	39.30	Open Market
California State Teachers’ Retirement System	Purchase	645	10/5/2012	$	39.44	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	73,135	10/8/2012	$	38.74	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	57,534	10/8/2012	$	38.73	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	45,181	10/8/2012	$	38.74	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	35,543	10/8/2012	$	38.73	Open Market
Relational Investors LLC	Purchase	8,801	10/8/2012	$	38.74	Open Market
Relational Investors LLC	Purchase	6,923	10/8/2012	$	38.73	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	28,766	10/9/2012	$	38.41	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	48,902	10/9/2012	$	38.45	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	29,092	10/9/2012	$	38.37	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	17,772	10/9/2012	$	38.41	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	30,213	10/9/2012	$	38.45	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	17,974	10/9/2012	$	38.37	Open Market
Relational Investors LLC	Purchase	3,462	10/9/2012	$	38.41	Open Market
Relational Investors LLC	Purchase	5,885	10/9/2012	$	38.45	Open Market
Relational Investors LLC	Purchase	3,502	10/9/2012	$	38.37	Open Market
California State Teachers’ Retirement System	Purchase	100	10/11/2012	$	37.52	Open Market
California State Teachers’ Retirement System	Purchase	1,198	10/19/2012	$	38.68	Open Market
California State Teachers’ Retirement System	Purchase	1,276	10/22/2012	$	38.72	Open Market
California State Teachers’ Retirement System	Purchase	1,022	10/23/2012	$	37.87	Open Market
California State Teachers’ Retirement System	Purchase	2,719	10/24/2012	$	36.93	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	11,128	10/25/2012	$	38.96	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	80,494	10/25/2012	$	39.07	Open Market

Relational Investors Mid-Cap Fund II, L.P.	Purchase	7,286	10/25/2012	$	38.96	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	52,707	10/25/2012	$	39.07	Open Market
Relational Investors LLC	Purchase	1,586	10/25/2012	$	38.96	Open Market
Relational Investors LLC	Purchase	11,476	10/25/2012	$	39.07	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	55,637	10/26/2012	$	38.96	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	16,692	10/26/2012	$	38.73	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	36,431	10/26/2012	$	38.96	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	10,929	10/26/2012	$	38.73	Open Market
Relational Investors LLC	Purchase	7,932	10/26/2012	$	38.96	Open Market
Relational Investors LLC	Purchase	2,379	10/26/2012	$	38.73	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	44,677	10/31/2012	$	39.55	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	10,962	10/31/2012	$	39.45	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	29,254	10/31/2012	$	39.55	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	7,176	10/31/2012	$	39.45	Open Market
Relational Investors LLC	Purchase	6,369	10/31/2012	$	39.55	Open Market
Relational Investors LLC	Purchase	1,562	10/31/2012	$	39.45	Open Market
California State Teachers’ Retirement System	Purchase	200	10/31/2012	$	38.64	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	71,752	11/1/2012	$	41.02	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	13,910	11/1/2012	$	41.09	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	46,984	11/1/2012	$	41.02	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	9,107	11/1/2012	$	41.09	Open Market
Relational Investors LLC	Purchase	10,230	11/1/2012	$	41.02	Open Market
Relational Investors LLC	Purchase	1,983	11/1/2012	$	41.09	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	56,387	11/2/2012	$	40.92	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	22,354	11/2/2012	$	40.81	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	36,928	11/2/2012	$	40.92	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	11,417	11/2/2012	$	40.81	Open Market
Relational Investors LLC	Purchase	8,042	11/2/2012	$	40.92	Open Market
Relational Investors LLC	Purchase	6,620	11/2/2012	$	40.81	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	44,057	11/5/2012	$	40.74	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	22,503	11/5/2012	$	40.74	Open Market
Relational Investors LLC	Purchase	13,049	11/5/2012	$	40.74	Open Market
California State Teachers’ Retirement System	Sale	1,141	11/8/2012	$	38.86	Open Market
California State Teachers’ Retirement System	Purchase	100	11/13/2012	$	38.25	Open Market

Relational Investors Mid-Cap Fund I, L.P.	Purchase	76,881	11/19/2012	$	39.50	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	39,332	11/19/2012	$	39.50	Open Market
Relational Investors LLC	Purchase	8,787	11/19/2012	$	39.50	Open Market
California State Teachers’ Retirement System	Sale	900	11/20/2012	$	39.38	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	76,880	11/20/2012	$	39.52	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	39,332	11/20/2012	$	39.52	Open Market
Relational Investors LLC	Purchase	8,788	11/20/2012	$	39.52	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	6,151	11/21/2012	$	39.97	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	34,247	11/21/2012	$	39.81	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	29,646	11/21/2012	$	39.96	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	3,146	11/21/2012	$	39.97	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	17,520	11/21/2012	$	39.81	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	15,166	11/21/2012	$	39.96	Open Market
Relational Investors LLC	Purchase	703	11/21/2012	$	39.97	Open Market
Relational Investors LLC	Purchase	3,914	11/21/2012	$	39.81	Open Market
Relational Investors LLC	Purchase	3,388	11/21/2012	$	39.96	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	30,753	11/23/2012	$	40.72	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	1,231	11/23/2012	$	40.40	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	15,732	11/23/2012	$	40.72	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	629	11/23/2012	$	40.40	Open Market
Relational Investors LLC	Purchase	3,515	11/23/2012	$	40.72	Open Market
Relational Investors LLC	Purchase	140	11/23/2012	$	40.40	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	61,503	11/26/2012	$	40.75	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	20,097	11/26/2012	$	40.67	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	31,466	11/26/2012	$	40.75	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	10,281	11/26/2012	$	40.67	Open Market
Relational Investors LLC	Purchase	7,031	11/26/2012	$	40.75	Open Market
Relational Investors LLC	Purchase	2,297	11/26/2012	$	40.67	Open Market
Relational Investors LLC	Purchase	10,547	11/27/2012	$	41.27	Open Market
Relational Investors LLC	Purchase	3,617	11/27/2012	$	41.18	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	92,254	11/27/2012	$	41.27	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	31,640	11/27/2012	$	41.18	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	47,199	11/27/2012	$	41.27	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	16,187	11/27/2012	$	41.18	Open Market
Relational Investors LLC	Purchase	3,516	11/28/2012	$	41.02	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	30,749	11/28/2012	$	41.02	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	15,735	11/28/2012	$	41.02	Open Market