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 27, 2026, 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 27, 2026	HPS		John Hancock Preferred Income				41021P103
			Fund III
						For the fiscal year-to-date period
		For the period 02/01/2026-02/28/2026				08/01/2025-02/28/20263
							% Breakdown
				% Breakdown			of the Total
		Current		of the Current		Total Cumulative	Cumulative
Source		Distribution ($)		Distribution		Distributions ($)	Distributions
Estimated Net
Investment Income (1)		0.0816		74%		0.5939	77%
Estimated Return of
Capital (1), (2)		0.0284		26%		0.1754	23%
Total per common share		0.1100		100%		0.7693	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 $0.0242 (22%) and $0.1692 (22%), 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, 2025, and will end on July 31, 2026.

If you have questions or need additional information, please contact your financial professional or call the Manulife John Hancock 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 30, 2026, 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 30, 2026	HPS		John Hancock Preferred Income				41021P103
			Fund III
						For the fiscal year-to-date period
		For the period 04/01/2026-04/30/2026				08/01/2025-04/30/20263
							% Breakdown
				% Breakdown			of the Total
		Current		of the Current		Total Cumulative	Cumulative
Source		Distribution ($)		Distribution		Distributions ($)	Distributions
Estimated Net
Investment Income (1)		0.0515		47%		0.7654	77%
Estimated Return of
Capital (1), (2)		0.0585		53%		0.2234	23%
Total per common share		0.1100		100%		0.9888	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 $0.0242 (22%) and $0.2175 (22%), 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, 2025, and will end on July 31, 2026.

If you have questions or need additional information, please contact your financial professional or call the Manulife John Hancock 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 May 29, 2026, 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 29, 2026	HPS		John Hancock Preferred Income				41021P103
			Fund III
						For the fiscal year-to-date period
		For the period 05/01/2026-05/31/2026				08/01/2025-05/31/20263
							% Breakdown
				% Breakdown			of the Total
		Current		of the Current		Total Cumulative	Cumulative
Source		Distribution ($)		Distribution		Distributions ($)	Distributions
Estimated Net
Investment Income (1)		0.0651		59%		0.8304	76%
Estimated Return of
Capital (1), (2)		0.0449		41%		0.2681	24%
Total per common share		0.1100		100%		1.0985	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 $0.0275 (25%) and $0.2746 (25%), 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, 2025, and will end on July 31, 2026.

If you have questions or need additional information, please contact your financial professional or call the Manulife John Hancock 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, 2026, 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, 2026	HPS		John Hancock Preferred Income				41021P103
			Fund III
						For the fiscal year-to-date period
		For the period 07/01/2026-07/31/2026				08/01/2025-07/31/20263
							% Breakdown
				% Breakdown			of the Total
		Current		of the Current		Total Cumulative	Cumulative
Source		Distribution ($)		Distribution		Distributions ($)	Distributions
Estimated Net
Investment Income (1)		0.0468		43%		1.0148	77%
Estimated Return of
Capital (1), (2)		0.0632		57%		0.3029	23%
Total per common share		0.1100		100%		1.3177	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 $0.0253 (23%) and $0.3031 (23%), 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, 2025, and will end on July 31, 2026.

If you have questions or need additional information, please contact your financial professional or call the Manulife John Hancock 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.