CABOT CORP — Director's Dealing 2008

Jan 15, 2008

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CABOT CORP (CBT)
CIK: 0000016040
Period of Report: 2008-01-10

Reporting Person: SPO ADVISORY CORP (10% Owner)
Reporting Person: SPO ADVISORY PARTNERS LP (10% Owner)
Reporting Person: SPO PARTNERS II LP (10% Owner)
Reporting Person: Elizabeth R. & William J. Patterson Foundation (10% Owner)
Reporting Person: SCULLY JOHN H (10% Owner)
Reporting Person: OBERNDORF WILLIAM E (10% Owner)
Reporting Person: PATTERSON WILLIAM J (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2008-01-11	Common Stock	P	1300	$31.11	Acquired	10046300	Indirect
2008-01-11	Common Stock	P	1200	$31.12	Acquired	10047500	Indirect
2008-01-11	Common Stock	P	700	$31.13	Acquired	10048200	Indirect
2008-01-11	Common Stock	P	400	$31.14	Acquired	10048600	Indirect
2008-01-11	Common Stock	P	700	$31.15	Acquired	10049300	Indirect
2008-01-11	Common Stock	P	500	$31.16	Acquired	10049800	Indirect
2008-01-11	Common Stock	P	300	$31.17	Acquired	10050100	Indirect
2008-01-11	Common Stock	P	600	$31.18	Acquired	10050700	Indirect
2008-01-11	Common Stock	P	500	$31.19	Acquired	10051200	Indirect
2008-01-11	Common Stock	P	800	$31.20	Acquired	10052000	Indirect
2008-01-11	Common Stock	P	300	$31.21	Acquired	10052300	Indirect
2008-01-11	Common Stock	P	200	$31.22	Acquired	10052500	Indirect
2008-01-11	Common Stock	P	600	$31.23	Acquired	10053100	Indirect
2008-01-11	Common Stock	P	300	$31.24	Acquired	10053400	Indirect
2008-01-11	Common Stock	P	300	$31.25	Acquired	10053700	Indirect
2008-01-11	Common Stock	P	200	$31.26	Acquired	10053900	Indirect
2008-01-11	Common Stock	P	100	$31.32	Acquired	10054000	Indirect
2008-01-11	Common Stock	P	100	$31.33	Acquired	10054100	Indirect
2008-01-14	Common Stock	P	100	$31.51	Acquired	10054200	Indirect
2008-01-14	Common Stock	P	100	$31.52	Acquired	10054300	Indirect
2008-01-14	Common Stock	P	200	$31.53	Acquired	10054500	Indirect
2008-01-14	Common Stock	P	100	$31.55	Acquired	10054600	Indirect
2008-01-14	Common Stock	P	300	$31.56	Acquired	10054900	Indirect
2008-01-14	Common Stock	P	100	$31.58	Acquired	10055000	Indirect
2008-01-14	Common Stock	P	400	$31.60	Acquired	10055400	Indirect
2008-01-14	Common Stock	P	500	$31.61	Acquired	10055900	Indirect
2008-01-14	Common Stock	P	100	$31.62	Acquired	10056000	Indirect
2008-01-14	Common Stock	P	600	$31.63	Acquired	10056600	Indirect
2008-01-14	Common Stock	P	400	$31.64	Acquired	10057000	Indirect
2008-01-14	Common Stock	P	500	$31.65	Acquired	10057500	Indirect

Footnotes

F1: The entities directly acquiring the shares reported on this form are SPO Partners II, L.P. ("SPO Partners"), which bought 93,800 shares, and the Elizabeth R. & William J. Patterson Foundation ("WJPFND"), which bought 2,500 shares.

F2: Due to the purchases causing this filing and related filings today, 9,662,600 shares are owned directly by SPO Partners, and may be deemed to be indirectly beneficially owned by (i) SPO Advisory Partners, L.P. ("SPO Advisory"), the sole general partner of SPO Partners, (ii) SPO Advisory Corp. ("SPO Corp."), the sole general partner of SPO Advisory, and (iii) John H. Scully ("JHS"), William E. Oberndorf ("WEO") and William J. Patterson ("WJP"), the three controlling persons of SPO Corp. 415,600 shares are owned directly by San Francisco Partners, L.P. ("SF Partners"), and may be deemed to be indirectly beneficially owned by (i) SF Advisory Partners, L.P. ("SF Advisory"), the sole general partner of SF Partners, (ii) SPO Corp., the sole general partner of SF Advisory, and (iii) JHS, WEO and WJP, the three controlling persons of SPO Corp. These shares are represented in the running total in Column 5 above, which does not include 21,900 shares held by WJPFND.

F3: Additionally, (i) 333,650 shares of the issuer's common stock may be deemed to be indirectly beneficially owned by WEO solely in his capacity as a trustee for the William and Susan Oberndorf Trust, dated 10/15/98 ("Oberndorf Trust"), (ii) 100,000 shares may be deemed to be indirectly beneficially owned by WEO solely in his capacity as general partner of Oberndorf Family Partners, a California limited partnership, (iii) WEO owns 109,000 shares in his IRA, which is self-directed, and (iv) 10,000 shares may be deemed to be indirectly beneficially owned by WEO solely in his capacity as trustee for the accounts of his two children, Peter C. Oberndorf & William Ernst Oberndorf.