Item 16. Form 10-K Summary.

None.

Signatures

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on the 5th day of February, 2021.

	ARTHUR J. GALLAGHER & CO.

	By		/S/ J. PATRICK GALLAGHER, JR.
			J. Patrick Gallagher, Jr.
	Chairman, President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below on the 5th day of February, 2021 by the following persons on behalf of the Registrant in the capacities indicated.

Name		Title
/S/ J. PATRICK GALLAGHER, JR.		Chairman, President and Director (Principal Executive Officer)
J. Patrick Gallagher, Jr.

/S/ DOUGLAS K. HOWELL		Vice President and Chief Financial Officer (Principal Financial Officer)
Douglas K. Howell

/S/ RICHARD C. CARY		Controller (Principal Accounting Officer)
Richard C. Cary

*SHERRY S. BARRAT		Director
Sherry S. Barrat

*WILLIAM L. BAX		Director
William L. Bax

* D. JOHN COLDMAN		Director
D. John Coldman

* DAVID S. JOHNSON		Director
David S. Johnson

*KAY W. McCURDY		Director
Kay W. McCurdy

*CHRISTOPHER C. MISKEL		Director
Christopher C. Miskel

* RALPH J. NICOLETTI		Director
Ralph J. Nicoletti

*NORMAN L. ROSENTHAL		Director
Norman L. Rosenthal

*By:		/S/ WALTER D. BAY
		Walter D. Bay, Attorney-in-Fact

Schedule II

Arthur J. Gallagher & Co.

Valuation and Qualifying Accounts

	Balance at Beginning of Year		Amounts Recorded in Earnings			Adjustments				Balance at End of Year
	(In millions)
Year ended December 31, 2020
Allowance for doubtful accounts	$	8.7	$	6.6		$	(5.2	)	(1)	$	10.1
Allowance for estimated policy cancellations		8.3		4.1			(2.5	)	(2)		9.9
Valuation allowance for deferred tax assets		80.5		14.4			—				94.9
Accumulated amortization of expiration
lists, non-compete agreements and trade names		2,087.5		417.3			32.2		(3)		2,537.0
Year ended December 31, 2019
Allowance for doubtful accounts	$	10.0	$	4.2		$	(5.5	)	(1)	$	8.7
Allowance for estimated policy cancellations		7.8		0.5			—		(2)		8.3
Valuation allowance for deferred tax assets		67.4		13.1			—				80.5
Accumulated amortization of expiration
lists, non-compete agreements and trade names		1,750.4		334.0			3.1		(3)		2,087.5
Year ended December 31, 2018
Allowance for doubtful accounts	$	13.5	$	5.8		$	(9.3	)	(1)	$	10.0
Allowance for estimated policy cancellations		7.4		(1.2	)		1.6		(2)		7.8
Valuation allowance for deferred tax assets		79.1		(11.7	)		—				67.4
Accumulated amortization of expiration
lists, non-compete agreements and trade names		1,490.7		291.2			(31.5	)	(3)		1,750.4

(1)	Net activity of bad debt write offs and recoveries and acquired businesses.

(2)	Additions to allowance related to acquired businesses.

(3)	Elimination of fully amortized expiration lists, non-compete agreements and trade names, intangible asset/amortization reclassifications and disposal of acquired businesses.

Previous: Item 15. Exhibits and Financial Statement Schedules.