SEC FORM 13F-HR

The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F COVER PAGE

OMB APPROVAL
OMB Number:3235-0006
Expires:Oct 31, 2018
Estimated average burden
hours per response:23.8

Report for the Calendar Year or Quarter Ended:03-31-2018
Check here if Amendment  Amendment Number:
This Amendment (Check only one.):  is a restatement.
  adds new holdings entries.
Institutional Investment Manager Filing this Report:
Name:Cincinnati Specialty Underwriters Insurance CO
Address:6200 South Gilmore Road
Fairfield, OH  45014
Form 13F File Number:028-12741

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:
Name:Martin F. Hollenbeck
Title:Chief Investment Officer
Phone:513-870-2000
Signature, Place, and Date of Signing:
/s/ Martin F. HollenbeckFairfieldOH05-03-2018
[Signature][City, State][Date]
Report Type (Check only one.):
X13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)
  13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)
  13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)
Form 13F Summary Page
Report Summary:
Number of Other Included Managers:1
Form 13F Information Table Entry Total:32
Form 13F Information Table Value Total:123,080
(thousands)
List of Other Included Managers:
Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.
[If there are no entries in this list, state “NONE” and omit the column headings and list entries.]
No.Form 13F File NumberName
1028-10798CINCINNATI FINANCIAL CORP

SEC FORM 13-F Information Table

The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE

OMB APPROVAL
OMB Number:3235-0006
Expires:Oct 31, 2018
Estimated average burden
hours per response:23.8

COLUMN 1COLUMN 2COLUMN 3COLUMN 4COLUMN 5COLUMN 6COLUMN 7COLUMN 8
VALUESHRS ORSH/PUT/INVESTMENTOTHERVOTING AUTHORITY
NAME OF ISSUERTITLE OF CLASSCUSIP(x$1000)PRN AMTPRNCALLDISCRETIONMANAGERSOLESHAREDNONE
3M COCOMMON88579Y1018,80340,100SH OTR1040,1000
ABBOTT LABORATORIESCOMMON0028241001,63027,200SH OTR1027,2000
ABBVIE INCCOMMON00287Y1092,57427,200SH OTR1027,2000
ACCENTURE PLC-CL ACOMMONG1151C1013,83825,000SH OTR1025,0000
AMERICA TOWER CORPCOMMON03027X1002,18015,000SH OTR1015,0000
APPLE INCCOMMON03783310012,91977,000SH OTR1077,0000
AUTOMATIC DATA PROCESSINGCOMMON0530151035,33447,000SH OTR1047,0000
BLACKROCK INCCOMMON09247X1015,41710,000SH OTR1010,0000
BROADCOM LTDCOMMONY098271091,7567,450SH OTR107,4500
CHUBB LTDCOMMONH1467J1041,1528,426SH OTR108,4260
CISCO SYSTEMS INCCOMMON17275R1023,83989,500SH OTR1089,5000
ENBRIDGE INCCOMMON29250N1054,521143,664SH OTR10143,6640
GILEAD SCIENCES INCCOMMON3755581033,16642,000SH OTR1042,0000
HASBRO INCCOMMON4180561072,52930,000SH OTR1030,0000
HOME DEPOT INCCOMMON4370761022,13912,000SH OTR1012,0000
INTL BUSINESS MACHINES CORPCOMMON4592001011,2278,000SH OTR108,0000
JP MORGAN CHASECOMMON46625H10010,22793,000SH OTR1093,0000
LYONDELLBASELLCOMMONN537451001,30312,333SH OTR1012,3330
MCDONALD'S CORPCOMMON5801351011,79811,500SH OTR1011,5000
MICROSOFT CORPCOMMON5949181045,47660,000SH OTR1060,0000
PNC FINANCIAL SERVICES GROUPCOMMON6934751052,42016,000SH OTR1016,0000
POLARIS INDUSTRIES INCCOMMON7310681028,99078,500SH OTR1078,5000
PRAXAIR INCCOMMON74005P1041,87613,000SH OTR1013,0000
PUBLIC STORAGECOMMON74460D1092,00410,000SH OTR1010,0000
RPM INTERNATIONAL INCCOMMON7496851033,81480,000SH OTR1080,0000
THE WALT DISNEY CO.COMMON2546871062,00920,000SH OTR1020,0000
UNITED TECHNOLOGIES CORPCOMMON9130171093,27126,000SH OTR1026,0000
US BANCORPCOMMON9029733043,96478,500SH OTR1078,5000
VALERO ENERGY CORPCOMMON91913Y1004,09444,133SH OTR1044,1330
VERIZON COMMUNICATIONS INCCOMMON92343V1041,43530,000SH OTR1030,0000
VF CORPCOMMON9182041081,41819,125SH OTR1019,1250
WEC ENERGY GROUP INCCOMMON92939U1065,95795,000SH OTR1095,0000
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