UNITED STATES	 	
 	SECURITIES AND EXCHANGE COMMISSION	 	
 	Washington, D.C. 20549	 	
 	 	 	
SCHEDULE 13G
 
Under the Securities Exchange Act of 1934
(Amendment No. 12)*
 
Morningstar, Inc.
(Name of Issuer)
Common Stock, no par value
(Title of Class of Securities)
617700 10 9
(CUSIP Number)
December 31, 2017
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

o	Rule 13d-1(b)	
o	Rule 13d-1(c)	
x	Rule 13d-1(d)	
 
*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.
 
The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

 

CUSIP No. 617700 10 9	
 	
 	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) 
Joseph D. Mansueto	
 	
 	2.	Check the Appropriate Box if a Member of a Group	
 	 	(a)	o	
 	 	(b)	o	
 	
 	3.	SEC Use Only	
 	
 	4.	Citizenship or Place of Organization 
U.S.A.	
 	 	 	
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With	5.	Sole Voting Power 
23,798,480	
	 	
	6.	Shared Voting Power 
408,366	
	 	
	7.	Sole Dispositive Power 
23,798,480	
	 	
	8.	Shared Dispositive Power
408,366	
 	
 	9.	Aggregate Amount Beneficially Owned by Each Reporting Person 
24,206,846	
 	
 	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares  o	
 	
 	11.	Percent of Class Represented by Amount in Row (9) 
56.9	
 	
 	12.	Type of Reporting Person 
IN	

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Item 1.	
 	(a)	Name of Issuer
Morningstar, Inc.	
 	(b)	Address of Issuer’s Principal Executive Offices
22 West Washington Street
Chicago, Illinois 60602	
 	
Item 2.	
 	(a)	Name of Person Filing
Joseph D. Mansueto	
 	(b)	Address of Principal Business Office or, if none, Residence
22 West Washington Street
Chicago, Illinois 60602	
 	(c)	Citizenship
U.S.A.	
 	(d)	Title of Class of Securities
Common Stock, no par value	
 	(e)	CUSIP Number
617700 10 9	
 	
Item 3.	If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:	
 	(a)	o	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);	
 	(b)	o	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);	
 	(c)	o	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);	
 	(d)	o	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8);	
 	(e)	o	An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);	
 	(f)	o	An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);	
 	(g)	o	A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G);	
 	(h)	o	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);	
 	(i)	o	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);	
 	(j)	o	A non-U.S. institution in accordance with §240.13d-1(b)(1)(ii)(J);	
 	(k)	o	Group, in accordance with §240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with §240.13d–1(b)(1)(ii)(J), please specify the type of institution:____________________________	
 
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Item 4.	Ownership	
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.	
 	(a)	Amount beneficially owned:   
24,206,846	
 	(b)	Percent of class:   
56.9	
 	(c)	Number of shares as to which the person has:
 	
 	 	(i)	Sole power to vote or to direct the vote   
23,798,480	
 	 	(ii)	Shared power to vote or to direct the vote    
408,366	
 	 	(iii)	Sole power to dispose or to direct the disposition of   
23,798,480	
 	 	(iv)	Shared power to dispose or to direct the disposition of   
408,366	
 	
Item 5.	Ownership of Five Percent or Less of a Class	
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following   o .	
 	
Item 6.	Ownership of More than Five Percent on Behalf of Another Person	
Not applicable.	
 	
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person	
Not applicable.	
 	
Item 8.	Identification and Classification of Members of the Group	
Not applicable.	
 	
Item 9.	Notice of Dissolution of Group	
Not applicable.	
 
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Item 10.	Certification	
Not applicable.	
 
[Signature Page Follows]
 
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Signature
 
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

 	January 16, 2018	
 	Date	
 	
/s/ Joseph D. Mansueto	
 	Signature	
 	
Joseph D. Mansueto	
 	Name/Title	
 
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