Label

Element

Value

Risk/Return:

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Entity Central Index Key

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0000795264

Thompson LargeCap Fund (Prospectus Summary) | Thompson LargeCap Fund

Risk/Return:

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Risk/Return, Heading

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LARGECAP FUND

Risk/Return Supplement

ck0000795264_SupplementTextBlock

THOMPSON IM FUNDS, INC.

LARGECAP FUND

Supplement Dated January 23, 2014 to

Prospectus Dated March 31, 2013

Change in Expense Reimbursement for the LargeCap Fund

Thompson Investment Management, Inc., investment advisor to the Funds, has contractually agreed to increase the amount of expenses it will reimburse the LargeCap Fund. Effective December 1, 2013,the Advisor has contractually agreed to waive management fees and/or reimburse expenses incurred by the LargeCap Fund through March 31, 2015, so that the annual operating expenses of the Fund do not exceed 1.15% of its average daily net assets. The previous expense limitation was 1.20%.

As a result of this change, the following table and related text on Page 3 of the Prospectus are deleted and replaced in their entirety by the following:

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fees	0.95%
Distribution (12b-1) Fees	None
Other Expenses	0.36%
Total Annual Fund Operating Expenses	1.31%
Fee Waivers and/or Expense Reimbursements (1)	(0.16%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	1.15%

⁽¹⁾ The Advisor has contractually agreed to waive management fees and/or reimburse expenses incurred by the LargeCap Fund through March 31, 2015, so that the annual operating expenses of the Fund do not exceed 1.15% of its average daily net assets. This waiver/reimbursement may only be terminated by the Advisor with the consent of the Board of Directors of the Funds.

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year	3 years	5 years	10 years
$117	$399	$703	$1,565

Operating Expenses, Caption

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Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Expense Example, Heading

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Example

Expense Example, Narrative

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This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text]

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Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Thompson LargeCap Fund (Prospectus Summary) | Thompson LargeCap Fund | Thompson LargeCap Fund

Risk/Return:

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Management Fees

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0.95%

Distribution (12b-1) Fees

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none

Other Expenses

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0.36%

Total Annual Fund Operating Expenses

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1.31%

Fee Waivers and/or Expense Reimbursements

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(0.16%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements

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1.15%

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2015-03-31

Expense Example, with Redemption, 1 Year

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$ 117

Expense Example, with Redemption, 3 Years

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399

Expense Example, with Redemption, 5 Years

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703

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,565

[1] The Advisor has contractually agreed to waive management fees and/or reimburse expenses incurred by the LargeCap Fund through March 31, 2015, so that the annual operating expenses of the Fund do not exceed 1.15% of its average daily net assets. This waiver/reimbursement may only be terminated by the Advisor with the consent of the Board of Directors of the Funds.