497

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM N-1A

CHECK APPROPRAITE BOX OR BOXES

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 [_]
PRE-EFFECTIVE AMENDMENT NO. __ [_]
 POST-EFFECTIVE AMENDMENT NO. 97 [x]

AND/OR

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
AMENDMENT NO. 66 [x]

AMERICAN GROWTH FUND, INC.
(EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
1636 Logan Street, Denver, Colorado 80203
(ADDRESS OF PRINCIPAL EXECUTIVE OFFICES) (ZIP CODE)
REGISTRANTS TELEPHONE NUMBER, INCLUDING AREA CODE (303) 626-0600

1636 Logan Street, Denver, CO 80203
(Name and Address of Agent for Service)

Approximate Date of Proposed Public Offering: as soon as practicable after
the effective date of the Registration Statement

It is proposed that this filing will become effective (check appropriate box)

[X] immediately upon filing pursuant to paragraph (b)
[_] on November 30, 2017 pursuant to paragraph (b)
[_] 60 days after filing pursuant to paragraph (a)(1)
[_] on _______________  Pursuant to paragraph (a)(1)
[_] 75 days after filing pursuant to paragraph (a)(2)
[_] on (date) pursuant to paragraph (a)(2) of Rule 485

If appropriate, check the following box:
[_] this post-effective amendment designates a new effective Date for a previously filed post-effective amendment.

SIGNATURES
Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Fund certifies that it meets all of the requirement for effectiveness of this registration statement under rule 485(b) under the Securities Act and has duly caused this registration statement to be signed on its behalf by the undersigned, duly authorized, in the City of Denver, and State of Colorado on the day of November 30, 2017.
American Growth Fund, Inc.By /s/ Timothy E. Taggart
Timothy E. Taggart
President

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the date(s) indicated.

/s/ Timothy E. Taggart

Timothy E. Taggart

Director

November 30, 2017

/s/ Eddie R. Bush

Eddie R. Bush

Director

November 30, 2017

/s/ Darrell Bush

Darrell Bush

Director

November 30, 2017

Part C Page 4

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Jul. 31, 2017
Registrant Name	dei_EntityRegistrantName	AMERICAN GROWTH FUND INC
Central Index Key	dei_EntityCentralIndexKey	0000005138
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Jun. 04, 2018
Document Effective Date	dei_DocumentEffectiveDate	Jun. 04, 2018
Prospectus Date	rr_ProspectusDate	Nov. 30, 2017

XML

Nov. 30, 2017

American Grown Fund, Inc.

American Growth Fund Series One

Supplement dated May 21, 2018, to the Prospectus dated November 30, 2017

This Supplement replaces certain information contained in the Prospectus of American Growth Fund Series One dated November 30, 2017.

Effective immediately, the table that follows the bar chart in the section titled “Risk/Return Bar Chart and Table” is deleted and replaced with the following:

Average annual total returns for the periods ended December 31, 2016	One Year	Five Years	Ten Years
Class A Return before taxes*	4.31%	11.75%	2.40%
Class B Return before taxes*	4.94%	12.03%	2.85%**
Class C Return before taxes*	8.76%	12.26%	2.26%
Class D Return before taxes*	4.29%	11.99%	2.71%
Class D Return after taxes on Distributions	4.29%	11.99%	2.71%
Class D Return after taxes on Distributions and Sale of Fund Shares	2.28%	9.82%	2.12%
Standard and Poor’s 500 Index (reflects no deduction for fees expenses, or taxes)	11.96%	14.66%	6.95%

* Assumes redemption at end of time period.
** After seven years Class B Shares convert to Class A Shares. The ten year return for Class B reflects the first seven year returns for Class B and the remaining 3 years as Class A.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes;
Actual after-tax returns depend on an investor´s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts;
After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

AMERICAN GROWTH FUND INC

Prospectus Date

rr_ProspectusDate

Nov. 30, 2017

Supplement [Text Block]

agfi_SupplementTextBlock

American Grown Fund, Inc.

American Growth Fund Series One

Supplement dated May 21, 2018, to the Prospectus dated November 30, 2017

This Supplement replaces certain information contained in the Prospectus of American Growth Fund Series One dated November 30, 2017.

Effective immediately, the table that follows the bar chart in the section titled “Risk/Return Bar Chart and Table” is deleted and replaced with the following:

Average annual total returns for the periods ended December 31, 2016	One Year	Five Years	Ten Years
Class A Return before taxes*	4.31%	11.75%	2.40%
Class B Return before taxes*	4.94%	12.03%	2.85%**
Class C Return before taxes*	8.76%	12.26%	2.26%
Class D Return before taxes*	4.29%	11.99%	2.71%
Class D Return after taxes on Distributions	4.29%	11.99%	2.71%
Class D Return after taxes on Distributions and Sale of Fund Shares	2.28%	9.82%	2.12%
Standard and Poor’s 500 Index (reflects no deduction for fees expenses, or taxes)	11.96%	14.66%	6.95%

* Assumes redemption at end of time period.
** After seven years Class B Shares convert to Class A Shares. The ten year return for Class B reflects the first seven year returns for Class B and the remaining 3 years as Class A.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes;
Actual after-tax returns depend on an investor´s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts;
After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.

AMERICAN GROWTH FUND Series One

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

agfi_SupplementTextBlock

American Grown Fund, Inc.

American Growth Fund Series One

Supplement dated May 21, 2018, to the Prospectus dated November 30, 2017

This Supplement replaces certain information contained in the Prospectus of American Growth Fund Series One dated November 30, 2017.

Effective immediately, the table that follows the bar chart in the section titled “Risk/Return Bar Chart and Table” is deleted and replaced with the following:

Average annual total returns for the periods ended December 31, 2016	One Year	Five Years	Ten Years
Class A Return before taxes*	4.31%	11.75%	2.40%
Class B Return before taxes*	4.94%	12.03%	2.85%**
Class C Return before taxes*	8.76%	12.26%	2.26%
Class D Return before taxes*	4.29%	11.99%	2.71%
Class D Return after taxes on Distributions	4.29%	11.99%	2.71%
Class D Return after taxes on Distributions and Sale of Fund Shares	2.28%	9.82%	2.12%
Standard and Poor’s 500 Index (reflects no deduction for fees expenses, or taxes)	11.96%	14.66%	6.95%

* Assumes redemption at end of time period.
** After seven years Class B Shares convert to Class A Shares. The ten year return for Class B reflects the first seven year returns for Class B and the remaining 3 years as Class A.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes;
Actual after-tax returns depend on an investor´s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts;
After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.

Performance Table Heading

rr_PerformanceTableHeading

Average annual total returns for the periods ended December 31, 2016

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes;

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Actual after-tax returns depend on an investor´s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts;

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes;
Actual after-tax returns depend on an investor´s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts;
After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.

AMERICAN GROWTH FUND Series One | Class A

Risk/Return:

rr_RiskReturnAbstract

One Year

rr_AverageAnnualReturnYear01

4.31%

^[1]

Five Years

rr_AverageAnnualReturnYear05

11.75%

^[1]

Ten Years

rr_AverageAnnualReturnYear10

2.40%

^[1]

AMERICAN GROWTH FUND Series One | Class B

Risk/Return:

rr_RiskReturnAbstract

One Year

rr_AverageAnnualReturnYear01

4.94%

^[1]

Five Years

rr_AverageAnnualReturnYear05

12.03%

^[1]

Ten Years

rr_AverageAnnualReturnYear10

2.85%

^[1],[2]

AMERICAN GROWTH FUND Series One | Class C

Risk/Return:

rr_RiskReturnAbstract

One Year

rr_AverageAnnualReturnYear01

8.76%

^[1]

Five Years

rr_AverageAnnualReturnYear05

12.26%

^[1]

Ten Years

rr_AverageAnnualReturnYear10

2.26%

^[1]

AMERICAN GROWTH FUND Series One | Class D

Risk/Return:

rr_RiskReturnAbstract

One Year

rr_AverageAnnualReturnYear01

4.29%

^[1]

Five Years

rr_AverageAnnualReturnYear05

11.99%

^[1]

Ten Years

rr_AverageAnnualReturnYear10

2.71%

^[1]

AMERICAN GROWTH FUND Series One | Return after taxes on Distributions | Class D

Risk/Return:

rr_RiskReturnAbstract

One Year

rr_AverageAnnualReturnYear01

4.29%

Five Years

rr_AverageAnnualReturnYear05

11.99%

Ten Years

rr_AverageAnnualReturnYear10

2.71%

AMERICAN GROWTH FUND Series One | Return after taxes on Distributions and Sale of Fund Shares | Class D

Risk/Return:

rr_RiskReturnAbstract

One Year

rr_AverageAnnualReturnYear01

2.28%

Five Years

rr_AverageAnnualReturnYear05

9.82%

Ten Years

rr_AverageAnnualReturnYear10

2.12%

AMERICAN GROWTH FUND Series One | Standard and Poor’s 500 Index (reflects no deduction for fees expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

One Year

rr_AverageAnnualReturnYear01

11.96%

Five Years

rr_AverageAnnualReturnYear05

14.66%

Ten Years

rr_AverageAnnualReturnYear10

6.95%

[1] Assumes redemption at end of time period.

[2] After seven years Class B Shares convert to Class A Shares. The ten year return for Class B reflects the first seven year returns for Class B and the remaining 3 years as Class A.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	AMERICAN GROWTH FUND INC
Prospectus Date	rr_ProspectusDate	Nov. 30, 2017
Document Creation Date	dei_DocumentCreationDate	Jun. 04, 2018