Exhibit 99.1

STATE STREET CORPORATION

Press Release Addendum
December 31, 2006

Table of Contents

		Page
Financial Highlights		2

Selected Financial Information

Quarters and years ended December 31, 2006 and 2005		3

Quarters ended December 31, 2006 and September 30, 2006		4

Consolidated Statement of Condition		5

These financial schedules should be used in conjunction with State Street’s quarterly earnings press release.

STATE STREET CORPORATION
Press Release Addendum

Financial Highlights
December 31, 2006

	Quarters Ended									% Change
										Q4		Q4
(Dollars in millions, except per share amounts	December 31,			September 30,			December 31,			vs.		vs.
or where otherwise noted)	2006			2006			2005			Q3		Q4

Total Revenue	$	1,622		$	1,515		$	1,416		7	%	15	%
Total Expenses	1,178			1,090			1,039			8		13
Income Tax Expense	135			147			128			(8	)	5
Net Income	309			278			249			11		24

Diluted Earnings Per Share	$	.91		$	.83		$	.74		10		23
Closing Price Per Share of Common Stock	$	67.44		$	62.40		$	55.44

Cash Dividends Declared Per Share	.21			.20			.19

Return on Equity	16.9		%	16.4		%	15.9		%

Assets Under Custody (AUC) (in trillions)	$	11.85		$	11.27		$	10.12
Assets Under Management (AUM) (in trillions)	1.75			1.63			1.44

	Years Ended						% Change
							2006
	December 31,			December 31,			vs.
(Dollars in millions, except per share amounts)	2006			2005			2005

Total Revenue	$	6,311		$	5,473		15	%
Total Expenses	4,540			4,041			12
Income Tax Expense	675			487			39
Income from Continuing Operations	1,096			945			16
Income (Loss) from Discontinued Operations	10			(107		)
Net Income	1,106			838

Diluted Earnings (Loss) Per Share:
From Continuing Operations	$	3.26		$	2.82		16
From Discontinued Operations	.03			(.32		)
Net Income	3.29			2.50

Cash Dividends Declared Per Share	$	.80		$	.72		11

Return on Equity from Continuing Operations	16.2		%	15.3		%
Return on Equity	16.4			13.6

STATE STREET CORPORATION
Press Release Addendum

SELECTED FINANCIAL INFORMATION
Quarters and years ended December 31, 2006 and December 31, 2005

	Quarters Ended							Years Ended
(Dollars in millions, except per share amounts)	December 31, 2006		December 31, 2005			% Change		December 31, 2006		December 31, 2005			% Change
Fee Revenue:
Servicing fees	$	698	$	637		10	%	$	2,723	$	2,474		10	%
Management fees	253		213			19		943		751			26
Trading services	203		182			12		862		694			24
Securities finance	90		73			23		386		330			17
Processing fees and other	61		71			(14	)	272		302			(10	)
Total fee revenue	1,305		1,176			11		5,186		4,551			14

Net Interest Revenue:
Interest revenue	1,226		861			42		4,324		2,930			48
Interest expense	910		619			47		3,214		2,023			59
Net interest revenue(1)	316		242			31		1,110		907			22
Provision for loan losses	—		—					—		—
Net interest revenue after provision for loan losses	316		242			31		1,110		907			22
Gains (Losses) on sales of available-for-sale investment securities, net	1		(2		)			15		(1		)
Gain on sale of Private Asset Management business	—		—					—		16
Total revenue	1,622		1,416			15		6,311		5,473			15

Operating Expenses:
Salaries and employee benefits	694		589			18		2,652		2,231			19
Information systems and communications	119		122			(2	)	501		486			3
Transaction processing services	121		118			3		496		449			10
Occupancy	94		89			6		373		391			(5	)
Other	150		121			24		518		484			7
Total operating expenses	1,178		1,039			13		4,540		4,041			12
Income from continuing operations before income tax expense	444		377			18		1,771		1,432			24
Income tax expense from continuing operations	135		128					675		487
Income from continuing operations	309		249			24		1,096		945			16
Income (Loss) from discontinued operations before income tax expense	—		—					16		(165		)
Income tax expense (benefit) from discontinued operations	—		—					6		(58		)
Income (Loss) from discontinued operations	—		—					10		(107		)
Net income	$	309	$	249				$	1,106	$	838

Earnings Per Share From Continuing Operations:
Basic	$	.93	$	.75		24		$	3.31	$	2.86		16
Diluted	.91		.74			23		$	3.26	2.82			16

Earnings (Loss) Per Share From Discontinued Operations:
Basic	$	—	$	—				$	.03	$	(.33	)
Diluted	—		—					.03		(.32		)

Earnings Per Share:
Basic	$	.93	$	.75				$	3.34	$	2.53
Diluted	.91		.74					3.29		2.50

Average Shares Outstanding (in thousands):
Basic	331,421		330,689					331,350		330,361
Diluted	337,429		337,061					335,732		334,646

Consolidated Statement of Income prepared in accordance with accounting principles generally accepted in the United States.

(1) Net interest revenue on a fully taxable-equivalent basis was $328 million and $253 million for the three months ended December 31, 2006 and 2005, respectively, and $1.16 billion and $949 million for the years ended December 31, 2006 and 2005, respectively.

STATE STREET CORPORATION
Press Release Addendum

SELECTED FINANCIAL INFORMATION
Quarters ended December 31, 2006 and September 30, 2006

	Quarters Ended
	December 31,		September 30,
(Dollars in millions, except per share amounts)	2006		2006		% Change

Fee Revenue:
Servicing fees	$	698	$	685	2	%
Management fees	253		238		6
Trading services	203		171		19
Securities finance	90		87		3
Processing fees and other	61		65		(6	)
Total fee revenue	1,305		1,246		5

Net Interest Revenue:
Interest revenue	1,226		1,103		11
Interest expense	910		837		9
Net interest revenue(1)	316		266		19
Provision for loan losses	—		—
Net interest revenue after provision for loan losses	316		266		19

Gains on sales of available-for-sale investment securities, net	1		3
Total revenue	1,622		1,515		7

Operating Expenses:
Salaries and employee benefits	694		639		9
Information systems and communications	119		121		(2	)
Transaction processing services	121		121		—
Occupancy	94		91		3
Other	150		118		27
Total operating expenses	1,178		1,090		8
Income before income tax expense	444		425		4
Income tax expense	135		147
Net income	$	309	$	278	11

Earnings Per Share:
Basic	$	.93	$	.84	11
Diluted	.91		.83		10

Average Shares Outstanding (in thousands):
Basic	331,421		330,440
Diluted	337,429		335,513

Consolidated Statement of Income prepared in accordance with accounting principles generally accepted in the United States.

(1) Net interest revenue on a fully taxable-equivalent basis was $328 million and $275 million for the three months ended December 31, 2006 and September 30, 2006.

STATE STREET CORPORATION
Press Release Addendum

CONSOLIDATED STATEMENT OF CONDITION

	December 31,			December 31,
(Dollars in millions, except per share amounts)	2006			2005
Assets
Cash and due from banks	$	2,368		$	2,684
Interest-bearing deposits with banks	5,236			11,275
Securities purchased under resale agreements	14,678			8,679
Trading account assets	785			764
Investment securities available for sale	60,445			54,979
Investment securities held to maturity	4,547			4,891
Loans and leases (net of allowance of $18)	8,928			6,464
Premises and equipment	1,560			1,453
Accrued income receivable	1,617			1,364
Goodwill	1,384			1,337
Other intangible assets	434			459
Other assets	5,371			3,619
Total assets	$	107,353		$	97,968

Liabilities
Deposits:
Noninterest-bearing	$	10,194		$	9,402
Interest-bearing — U.S.	1,272			2,379
Interest-bearing — Non-U.S.	54,180			47,865
Total deposits	65,646			59,646

Securities sold under repurchase agreements	19,147			20,895
Federal funds purchased	2,147			1,204
Other short-term borrowings	2,835			1,219
Accrued taxes and other expenses	3,143			2,632
Other liabilities	4,567			3,346
Long-term debt	2,616			2,659
Total liabilities	100,101			91,601

Shareholders’ Equity
Preferred stock, no par: authorized 3,500,000; issued none
Common stock, $1 par: authorized 500,000,000 shares; issued 337,126,000 and 337,126,000 shares	337			337
Surplus	399			266
Retained earnings	7,030			6,189
Accumulated other comprehensive loss	(224		)	(231		)
Treasury stock (at cost 4,688,000 and 3,501,000 shares)	(290		)	(194		)
Total shareholders’ equity	7,252			6,367
Total liabilities and shareholders’ equity	$	107,353		$	97,968