497

Prospectus Supplement   February 28, 2017 

Putnam Multi-Cap Growth Fund
Prospectus dated October 30, 2016

Effective April 1, 2017, purchases of class B shares will be closed to new and existing investors except by exchange from class B shares of another Putnam fund or through dividend and/or capital gains reinvestment.

The prospectus is supplemented as follows to add information about class T shares. Class T shares of the fund are not currently available for purchase.

The front cover page is supplemented to add class T shares to the list of shares to which the prospectus relates, and to indicate that the fund symbol for class T shares is pending.

The following information replaces similar disclosure for the fund under Fees and expenses:

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 11 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

The following information is added to similar disclosure for the fund under Fees and expenses:

Shareholder fees (fees paid directly from your investment)
	Maximum sales charge (load)	Maximum deferred sales charge (load) (as a percentage
	imposed on purchases (as a	of original purchase price or redemption proceeds,
Share class	percentage of offering price)	whichever is lower)
Class T	2.50%	NONE

Annual fund operating expenses
(expenses you pay each year as a percentage of the value of your investment)
		Distribution and		Total annual fund
Share class	Management fees†	service (12b-1) fees	Other expenses	operating expenses
Class T	0.53%	0.25%	0.27%<	1.05%

† Management fees reflect a performance adjustment. The fund’s base management fee is subject to adjustment, up or down, based on the fund’s performance relative to the performance of the Russell 3000 Growth Index. For the most recent fiscal year, the fund’s base management fee prior to any performance adjustment was 0.553%.

< Other expenses are based on expenses of class A shares for the fund’s last fiscal year.

Example

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.

Share class	1 year	3 years	5 years	10 years
Class T	$354	$576	$815	$1,500

XML

Putnam Multi-Cap Growth Fund

Total

Risk/Return:

Supplement Text

Prospectus Supplement   February 28, 2017 

Putnam Multi-Cap Growth Fund
Prospectus dated October 30, 2016

Effective April 1, 2017, purchases of class B shares will be closed to new and existing investors except by exchange from class B shares of another Putnam fund or through dividend and/or capital gains reinvestment.

The prospectus is supplemented as follows to add information about class T shares. Class T shares of the fund are not currently available for purchase.

The front cover page is supplemented to add class T shares to the list of shares to which the prospectus relates, and to indicate that the fund symbol for class T shares is pending.

The following information replaces similar disclosure for the fund under Fees and expenses:

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 11 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

The following information is added to similar disclosure for the fund under Fees and expenses:

Shareholder fees (fees paid directly from your investment)
	Maximum sales charge (load)	Maximum deferred sales charge (load) (as a percentage
	imposed on purchases (as a	of original purchase price or redemption proceeds,
Share class	percentage of offering price)	whichever is lower)
Class T	2.50%	NONE

Annual fund operating expenses
(expenses you pay each year as a percentage of the value of your investment)
		Distribution and		Total annual fund
Share class	Management fees†	service (12b-1) fees	Other expenses	operating expenses
Class T	0.53%	0.25%	0.27%<	1.05%

† Management fees reflect a performance adjustment. The fund’s base management fee is subject to adjustment, up or down, based on the fund’s performance relative to the performance of the Russell 3000 Growth Index. For the most recent fiscal year, the fund’s base management fee prior to any performance adjustment was 0.553%.

< Other expenses are based on expenses of class A shares for the fund’s last fiscal year.

Example

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.

Share class	1 year	3 years	5 years	10 years
Class T	$354	$576	$815	$1,500

XML

Putnam Multi-Cap Growth Fund

Fees and expenses

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 11 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	Putnam Multi-Cap Growth Fund Class T
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	2.50%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	none

Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Putnam Multi-Cap Growth Fund Class T
Management fees	0.53%	[1]
Distribution and service (12b-1) fees	0.25%
Other expenses	0.27%	[2]
Total annual fund operating expenses	1.05%

Example

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.

Expense Example	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Putnam Multi-Cap Growth Fund | Class T | USD ($)	354	576	815	1,500

[1] Management fees reflect a performance adjustment. The fund's base management fee is subject to adjustment, up or down, based on the fund's performance relative to the performance of the Russell 3000 Growth Index. For the most recent fiscal year, the fund's base management fee prior to any performance adjustment was 0.553%.

[2] Other expenses are based on expenses of class A shares for the fund's last fiscal year.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Feb. 28, 2017
Registrant Name	dei_EntityRegistrantName	PUTNAM MULTI-CAP GROWTH FUND
Central Index Key	dei_EntityCentralIndexKey	0000865177
Amendment Flag	dei_AmendmentFlag	false
Trading Symbol	dei_TradingSymbol	PNOPX
Document Creation Date	dei_DocumentCreationDate	Mar. 13, 2017
Document Effective Date	dei_DocumentEffectiveDate	Apr. 01, 2017
Prospectus Date	rr_ProspectusDate	Oct. 30, 2016
Putnam Multi-Cap Growth Fund
Risk/Return:	rr_RiskReturnAbstract
Expense [Heading]	rr_ExpenseHeading	Fees and expenses
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 11 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 11 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.
Putnam Multi-Cap Growth Fund | Class T
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	2.50%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.53%	[1]
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.27%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.05%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 354
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	576
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	815
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,500

[1] Management fees reflect a performance adjustment. The fund's base management fee is subject to adjustment, up or down, based on the fund's performance relative to the performance of the Russell 3000 Growth Index. For the most recent fiscal year, the fund's base management fee prior to any performance adjustment was 0.553%.

[2] Other expenses are based on expenses of class A shares for the fund's last fiscal year.