UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549

FORM 10-D

ASSET BACKED ISSUER
DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

For the monthly distribution period from: September 18, 2025 to October 20, 2025

Commission File Number of issuing entity: 333-190246-16

Central Index Key Number of issuing entity: 0001649184

JPMBB Commercial Mortgage Securities Trust 2015-C31
(Exact name of issuing entity as specified in its charter)

Commission File Number of depositor: 333-190246

Central Index Key Number of depositor: 0001013611

J.P. Morgan Chase Commercial Mortgage Securities Corp.
(Exact name of depositor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0000835271

JPMorgan Chase Bank, National Association
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0000312070

Barclays Bank PLC
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001567746

Aspire HEI, Inc. (formerly known as Redwood Commercial Mortgage Corporation)
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001682523

Starwood Mortgage Funding II LLC
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001587045

RAIT Funding, LLC
(Exact name of sponsor as specified in its charter)

Harris Rendelstein (212) 834-6737
(Name and telephone number, including area code, of the person to contact in connection with this filing)

New York
(State or other jurisdiction of incorporation or organization of the issuing entity)

38-3976112
38-3976113
38-3976114
38-7143597
(I.R.S. Employer Identification No.)

c/o Computershare Trust Company, N.A., as agent for
Wells Fargo Bank, National Association
9062 Old Annapolis Road
Columbia, MD 21045
(Address of principal executive offices of the issuing entity) (Zip Code)

(667) 786-1992
(Telephone number, including area code)

Not Applicable
(Former name, former address, if changed since last report)

Registered/reporting pursuant to (check one)

Title of Class	Section 12(b)	Section 12(g)	Section 15(d)	Name of Exchange (If Section 12(b))
A-1			X
A-2			X
A-3			X
A-SB			X
X-A			X
X-B			X
A-S			X
B			X
C			X
EC			X
D			X

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes X No

Part I - DISTRIBUTION INFORMATION

Item 1. Distribution and Pool Performance Information.

On October 20, 2025 a distribution was made to holders of the certificates issued by JPMBB Commercial Mortgage Securities Trust 2015-C31 .

The distribution report is attached as an Exhibit to this Form 10-D, please see Item 10(b), Exhibit 99.1 for the related information.

The following table presents the loss information for the trust assets for the JPMBB Commercial Mortgage Securities Trust 2015-C31 in accordance with Item 1100(b) as required by Item 1121(a)(9) of Regulation AB:

Loss Information as reported on October 20, 2025

Number of Delinquencies 30+ days	% of Delinquencies 30+ days by Pool Balance	Number of Loans/REOs with Losses	Average Net Loss
4	74.14%	3	$1,026,480.38

No assets securitized by J.P. Morgan Chase Commercial Mortgage Securities Corp. (the "Depositor") and held by JPMBB Commercial Mortgage Securities Trust 2015-C31 were the subject of a demand to repurchase or replace for breach of the representations and warranties contained in the underlying transaction documents during the monthly distribution period from September 18, 2025 to October 20, 2025.

The Depositor filed its most recent Form ABS-15G in accordance with Rule 15Ga-1 under the Exchange Act (a "Rule 15Ga-1 Form ABS-15G") on August 6, 2025. The CIK number for the Depositor is 0001013611.

JPMorgan Chase Bank, National Association filed its most recent Rule 15Ga-1 Form ABS-15G for this asset class on February 7, 2025. The CIK number for JPMorgan Chase Bank, National Association is 0000835271.

Barclays Bank PLC filed its most recent Rule 15Ga-1 Form ABS-15G on February 13, 2025. The CIK number for Barclays Bank PLC is 0000312070.

Aspire HEI, Inc. (formerly known as Redwood Commercial Mortgage Corporation) filed its most recent Rule 15Ga-1 Form ABS-15G on January 22, 2025. The CIK number for Aspire HEI, Inc. (formerly known as Redwood Commercial Mortgage Corporation) is 0001567746.

Starwood Mortgage Funding II LLC filed its most recent Rule 15Ga-1 Form ABS-15G on January 23, 2025. The CIK number for Starwood Mortgage Funding II LLC is 0001682523.

RAIT Funding, LLC filed its most recent Rule 15Ga-1 Form ABS-15G on February 16, 2021. The CIK number for RAIT Funding, LLC is 0001587045.

Part II - OTHER INFORMATION

Item 7. Change in Sponsor Interest in the Securities.

None

Item 9. Other Information.

Midland Loan Services, A Division of PNC Bank, National Association, in its capacity as Master Servicer for JPMBB Commercial Mortgage Securities Trust 2015-C31 , affirms the following amounts in the respective accounts:

Certificate Account Beginning and Ending Balance
Prior Distribution Date	09/17/2025	$843,020.70
Current Distribution Date	10/20/2025	$917,434.67

REO Account Beginning and Ending Balance
Prior Distribution Date	09/17/2025	$0.00
Current Distribution Date	10/20/2025	$0.00

Computershare Trust Company, N.A., as agent for Wells Fargo Bank, N.A., in its capacity as Certificate Administrator for JPMBB Commercial Mortgage Securities Trust 2015-C31 , affirms the following amounts in the respective accounts:

Distribution Account Beginning and Ending Balance
Prior Distribution Date	09/17/2025	$958.54
Current Distribution Date	10/20/2025	$927.63

Interest Reserve Account Beginning and Ending Balance
Prior Distribution Date	09/17/2025	$0.00
Current Distribution Date	10/20/2025	$0.00

Gain-on-Sale Reserve Account Beginning and Ending Balance
Prior Distribution Date	09/17/2025	$0.00
Current Distribution Date	10/20/2025	$0.00

Item 10. Exhibits.

(a) The following is a list of documents filed as part of this Report on Form 10-D:

(99.1) Monthly report distributed to holders of the certificates issued by JPMBB Commercial Mortgage Securities Trust 2015-C31 , relating to the October 20, 2025 distribution.

(b) The exhibits required to be filed by the Registrant pursuant to this Form are listed above.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

J.P. Morgan Chase Commercial Mortgage Securities Corp.
(Depositor)

/s/ Harris Rendelstein
Harris Rendelstein, Executive Director

Date: October 30, 2025

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549

FORM 10-D

ASSET BACKED ISSUER DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Registered/reporting pursuant to (check one)

Loss Information as reported on October 20, 2025

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549

ASSET BACKED ISSUER
DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

JPMBB Commercial Mortgage Securities Trust 2015-C31 10-D