AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 13, 2018SECURITIES ACT FILE NO. 002-30447INVESTMENT COMPANY ACT FILE NO. 811-01728UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON, D.C. 20549FORM N-1AREGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933:

   [X]Pre-Effective Amendment No.

   

   [   ]Post-Effective Amendment No. 76

   

   [X]and/orREGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940:

   [X]Amendment No. 55

   

   [X](Check Appropriate Box or Boxes)NICHOLAS FUND, INC.(Exact Name of Registrant as Specified in Charter)411 East Wisconsin AvenueMilwaukee, WI

   53202(Address of Principal Executive Offices)

   (Zip Code)Registrant's Telephone Number, Including Area Code (414) 272-4650Jennifer R. KloehnNicholas Fund, Inc.411 East Wisconsin AvenueMilwaukee, WI 53202(Name and Address of Agent for Service)WITH A COPY TO:K. Thor Lundgren, Esq.Jason T. Thompson, Esq.Michael Best & Friedrich LLP100 East Wisconsin Avenue, Suite 3300Milwaukee, WI 53202It is proposed that this filing will become effective (check appropriate box):[  x  ]

   Immediately upon filing pursuant to paragraph (b) of Rule 485.[

   ]

   On (date) pursuant to paragraph (b) of Rule 485.[

   ]

   60 days after filing pursuant to paragraph (a)(1) of Rule 485.[

   ]

   On (date) pursuant to paragraph (a)(1) of Rule 485.[

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   75 days after filing pursuant to paragraph (a)(2) of Rule 485.[

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   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.


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SIGNATURES Pursuant to the requirements the Securities Act of 1933, and the Investment Company Act of 1940, each as amended, the Registrant certifies that it meets all of the requirements for effectiveness of the Registration Statement under Rule 485(b) under the Securities Act of 1933, as amended, and has duly caused this Registration Statement to be signed below on its behalf by the undersigned, thereunto duly authorized, in the City of Milwaukee and State of Wisconsin, on the 13thday of August, 2018. Nicholas Fund, Inc.By:

   /s/ Jennifer R. KloehnJennifer R. KloehnSenior Vice President, Treasurer andPrincipal Financial and Accounting Officer
  Pursuant to the requirements of the Securities Act of 1933, as amended, this Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated on the 13thday of August, 2018. /s/

   David O. Nicholas*

   President (Chief ExecutiveDavid O. Nicholas

   Officer), and Director/s/

   John A. Hauser*

   DirectorJohn A. Hauser/s/

   Timothy P. Reiland*

   DirectorTimothy P. Reiland/s/

   Jay H. Robertson*

   DirectorJay H. Robertson* By:/s/ Jennifer R. KloehnJennifer R. Kloehn,Attorney-in-Fact pursuant toPowers of Attorney previously filed.


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EXHIBIT INDEXExhibit
	Exhibit No.XBRL Instance Document
	EX-101.INSXBRL Taxonomy Extension Schema Document
	EX-101.SCHXBRL Taxonomy Extension Calculation Linkbase
	EX-101.CALXBRL Taxonomy Extension Definition Linkbase
	EX-101.DEFXBRL Taxonomy Extension Labels Linkbase
	EX-101.LABXBRL Taxonomy Extension Presentation Linkbase
	EX-101.PRE