Important information regarding your distributions

We are providing shareholders of the John Hancock Preferred Income Fund III with information concerning the portion of the distributions made for May 31, 2023, that was from a source other than net investment company book income. No action is required on your part.

The amounts and sources of distributions reported in this notice are estimates, are not being provided for tax reporting purposes and may later be determined to be from taxable net investment income, short-term gains, long-term gains (to the extent permitted by law), and return of capital. The actual amounts and sources for tax reporting purposes will depend upon the Fund's investment experience during the remainder of the fiscal year and may be subject to changes based on tax regulations. The Fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes.

Payable Date:	Ticker #		Fund Name			CUSIP
May 31, 2023	HPS		John Hancock Preferred Income			41021P103
			Fund III
					For the fiscal year-to-date period
		For the period 05/01/2023-05/31/2023			08/01/2022-05/31/20233
						% Breakdown
				% Breakdown		of the Total
		Current		of the Current	Total Cumulative	Cumulative
Source		Distribution ($)		Distribution	Distributions ($)	Distributions
Estimated Net
Investment Income (1)		0.0970		88%	0.8722	79%
Estimated Return of
Capital (1), (2)		0.0130		12%	0.2265	21%
Total per common share		0.1100		100%	1.0987	100%

(1)The amounts and sources of distributions reported above are only estimates on a book basis. These estimates may, and likely will, vary over time based on the investment activities of the Fund and changes in the value of portfolio investments. The sources of distributions may later be determined to be from taxable net investment income, short-term gains, long-term gains (to the extent permitted by law), and return of capital. Investors should understand that a return of capital is not a distribution from income or gains of a Fund.

(2)On a tax basis, the estimated components of the current distribution and cumulative distribution would include an estimated return of capital of $0.0154 (14%) and $0.1538 (14%), respectively. These amounts are estimates and the actual amounts and sources for tax reporting purposes may change upon final determination of tax characteristics and may be subject to changes based on tax regulations. The Fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes.

(3)The Fund's current fiscal year began on August 1, 2022, and will end on July 31, 2023.

If you have questions or need additional information, please contact your financial professional or call the John Hancock Investment Management Closed-End Fund Information Line at 1-800-843- 0090, Monday through Friday between 8:00 a.m. and 7:00 p.m., Eastern Time.

Important information regarding your distributions

We are providing shareholders of the John Hancock Preferred Income Fund III with information concerning the portion of the distributions made for July 31, 2023, that was from a source other than net investment company book income. No action is required on your part.

The amounts and sources of distributions reported in this notice are estimates, are not being provided for tax reporting purposes and may later be determined to be from taxable net investment income, short-term gains, long-term gains (to the extent permitted by law), and return of capital. The actual amounts and sources for tax reporting purposes will depend upon the Fund's investment experience during the remainder of the fiscal year and may be subject to changes based on tax regulations. The Fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes.

Payable Date:	Ticker #		Fund Name			CUSIP
July 31, 2023	HPS		John Hancock Preferred Income			41021P103
			Fund III
					For the fiscal year-to-date period
		For the period 07/01/2023-07/31/2023			08/01/2022-07/31/20233
						% Breakdown
				% Breakdown		of the Total
		Current		of the Current	Total Cumulative	Cumulative
Source		Distribution ($)		Distribution	Distributions ($)	Distributions
Estimated Net
Investment Income (1)		0.0218		20%	1.0031	76%
Estimated Return of
Capital (1), (2)		0.0882		80%	0.3149	24%
Total per common share		0.1100		100%	1.3180	100%

(1)The amounts and sources of distributions reported above are only estimates on a book basis. These estimates may, and likely will, vary over time based on the investment activities of the Fund and changes in the value of portfolio investments. The sources of distributions may later be determined to be from taxable net investment income, short-term gains, long-term gains (to the extent permitted by law), and return of capital. Investors should understand that a return of capital is not a distribution from income or gains of a Fund.

(2)On a tax basis, the estimated components of the current distribution and cumulative distribution would include an estimated return of capital of $0.0187 (17%) and $0.2241 (17%), respectively. These amounts are estimates and the actual amounts and sources for tax reporting purposes may change upon final determination of tax characteristics and may be subject to changes based on tax regulations. The Fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes.

(3)The Fund's current fiscal year began on August 1, 2022, and will end on July 31, 2023.

If you have questions or need additional information, please contact your financial professional or call the John Hancock Investment Management Closed-End Fund Information Line at 1-800-843- 0090, Monday through Friday between 8:00 a.m. and 7:00 p.m., Eastern Time.

Important information regarding your distributions

We are providing shareholders of the John Hancock Preferred Income Fund III with information concerning the portion of the distributions made for April 28, 2023, that was from a source other than net investment company book income. No action is required on your part.

The amounts and sources of distributions reported in this notice are estimates, are not being provided for tax reporting purposes and may later be determined to be from taxable net investment income, short-term gains, long-term gains (to the extent permitted by law), and return of capital. The actual amounts and sources for tax reporting purposes will depend upon the Fund's investment experience during the remainder of the fiscal year and may be subject to changes based on tax regulations. The Fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes.

Payable Date:	Ticker #		Fund Name			CUSIP
April 28, 2023	HPS		John Hancock Preferred Income			41021P103
			Fund III
					For the fiscal year-to-date period
		For the period 04/01/2023-04/30/2023			08/01/2022-04/30/20233
						% Breakdown
				% Breakdown		of the Total
		Current		of the Current	Total Cumulative	Cumulative
Source		Distribution ($)		Distribution	Distributions ($)	Distributions
Estimated Net
Investment Income (1)		0.0330		30%	0.7750	78%
Estimated Return of
Capital (1), (2)		0.0770		70%	0.2139	22%
Total per common share		0.1100		100%	0.9889	100%

(1)The amounts and sources of distributions reported above are only estimates on a book basis. These estimates may, and likely will, vary over time based on the investment activities of the Fund and changes in the value of portfolio investments. The sources of distributions may later be determined to be from taxable net investment income, short-term gains, long-term gains (to the extent permitted by law), and return of capital. Investors should understand that a return of capital is not a distribution from income or gains of a Fund.

(2)On a tax basis, the estimated components of the current distribution and cumulative distribution would include an estimated return of capital of $0.0165 (15%) and $0.1483 (15%), respectively. These amounts are estimates and the actual amounts and sources for tax reporting purposes may change upon final determination of tax characteristics and may be subject to changes based on tax regulations. The Fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes.

(3)The Fund's current fiscal year began on August 1, 2022, and will end on July 31, 2023.

If you have questions or need additional information, please contact your financial professional or call the John Hancock Investment Management Closed-End Fund Information Line at 1-800-843- 0090, Monday through Friday between 8:00 a.m. and 7:00 p.m., Eastern Time.

Important information regarding your distributions

We are providing shareholders of the John Hancock Preferred Income Fund III with information concerning the portion of the distributions made for February 28, 2023, that was from a source other than net investment company book income. No action is required on your part.

The amounts and sources of distributions reported in this notice are estimates, are not being provided for tax reporting purposes and may later be determined to be from taxable net investment income, short-term gains, long-term gains (to the extent permitted by law), and return of capital. The actual amounts and sources for tax reporting purposes will depend upon the Fund's investment experience during the remainder of the fiscal year and may be subject to changes based on tax regulations. The Fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes.

Payable Date:	Ticker #		Fund Name			CUSIP
February 28, 2023	HPS		John Hancock Preferred Income			41021P103
			Fund III
					For the fiscal year-to-date period
		For the period 02/01/2023-02/28/2023			08/01/2022-02/28/20233
						% Breakdown
				% Breakdown		of the Total
		Current		of the Current	Total Cumulative	Cumulative
Source		Distribution ($)		Distribution	Distributions ($)	Distributions
Estimated Net
Investment Income (1)		0.1067		97%	0.6331	82%
Estimated Return of
Capital (1), (2)		0.0033		3%	0.1363	18%
Total per common share		0.1100		100%	0.7694	100%

(1)The amounts and sources of distributions reported above are only estimates on a book basis. These estimates may, and likely will, vary over time based on the investment activities of the Fund and changes in the value of portfolio investments. The sources of distributions may later be determined to be from taxable net investment income, short-term gains, long-term gains (to the extent permitted by law), and return of capital. Investors should understand that a return of capital is not a distribution from income or gains of a Fund.

(2)On a tax basis, the estimated components of the current distribution and cumulative distribution would include an estimated return of capital of $0.0110 (10%) and $0.0769 (10%), respectively. These amounts are estimates and the actual amounts and sources for tax reporting purposes may change upon final determination of tax characteristics and may be subject to changes based on tax regulations. The Fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes.

(3)The Fund's current fiscal year began on August 1, 2022, and will end on July 31, 2023.

If you have questions or need additional information, please contact your financial professional or call the John Hancock Investment Management Closed-End Fund Information Line at 1-800-843- 0090, Monday through Friday between 8:00 a.m. and 7:00 p.m., Eastern Time.