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
Estimated average burden
hours per response: 23.8
Report for the Calendar Year or Quarter Ended: 12-31-2013
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: BAIN CAPITAL INVESTORS LLC
Address: JOHN HANCOCK TOWER
200 CLARENDON STREET
BOSTON, MA  02116
Form 13F File Number: 028-11185

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: Michael Ward
Title: Managing Director and Chief Operating Officer
Phone: 617-516-2000
Signature, Place, and Date of Signing:
/s/ Michael D. Ward Boston,  MA 02-10-2014
[Signature] [City, State] [Date]
Bain Capital Investors, LLC (BCI) is the (i) general partner of Bain Capital Partners VIII, L.P., which is the general partner of Bain Capital Fund VIII, L.P., and Bain Capital VIII Coinvestment Fund, L.P., (ii) general partner of Bain Capital Partners VIII-E, L.P., which is the general partner of Bain Capital Fund VIII-E, L.P., (iii) general partner of Bain Capital Lion Holdings, L.P., which is a shareholder of Bain Pumbaa LuxCo S.a.r.l, (iv) general partner of Bain Capital Partners IX, L.P., which is the general partner of Bain Capital Fund IX, L.P., Bain Capital IX Coinvestment Fund, L.P., Bain Capital (OSI) IX, L.P. and Bain Capital (OSI) IX Coinvestment, L.P, (v) general partner of Bain Capital Partners X, L.P., which is the general partner of Bain Capital Fund X, L.P, and (vi) general partner of Bain Capital Integral Investors 2008, L.P. Bain Capital Fund IX, L.P. was a shareholder of Bain Pumbaa LuxCo S.a.r.l. Bain Capital Fund VIII, L.P. and Bain Capital Fund VIII-E, L.P., own all outstanding stock capital of Sensata Management Company, S.A. Sensata Management Company S.A. is the manager of Sensata Investment Company, S.C.A. Bain Capital Investors, LLC is also the administrative member of Bain Capital Integral Investors 2006, LLC, Bain Capital Hercules Investors, LLC, and BCIP TCV, LLC. BCI is the general partner of Bain Capital Partners (SQ) VIII, L.P., which is the general partner of Bain Capital (SQ) VIII, L.P.
Report Type (Check only one.):
X 13F 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: 23
Form 13F Information Table Entry Total: 11
Form 13F Information Table Value Total: 10,574,830
(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 Number Name
1 028-13947 Bain Capital Partners VIII, L.P.
2 028-13946 Bain Capital Fund VIII, L.P.
3 028-13945 Bain Capital VIII Coinvestment Fund, L.P.
4 028-13943 Bain Capital Partners VIII-E, L.P.
5 028-13940 Bain Capital Fund VIII-E, L.P.
6 028-13942 Bain Capital Partners IX, L.P.
7 028-13938 Bain Capital Fund IX, L.P.
8 028-13941 Bain Capital IX Coinvestment Fund, L.P.
9 028-13949 Sensata Investment Company, S.C.A.
10 028-13951 Sensata Management Company, S.A.
11 028-14366 Bain Capital Lion Holdings, L.P.
12 028-14359 Bain Pumbaa LuxCo S.a.r.l.
13 028-14482 Bain Capital Integral Investors 2006, LLC
14 028-14484 BCIP TCV, LLC
15 028-14483 Bain Capital Hercules Investors, LLC
16 028-14982 Bain Capital (SQ) VIII, L.P.
17 028-14983 Bain Capital Partners (SQ) VIII, L.P.
18 028-15075 Bain Capital (OSI) IX, L.P.
19 028-15074 Bain Capital (OSI) IX Coinvestment, L.P.
20 028-15506 Bain Capital Partners X, L.P.
21 028-15509 Bain Capital Fund X, L.P.
22 028-15576 Bain Capital Integral Investors 2008, L.P.
23   Bain Capital Integral Investors, L.P.