Master Portfolio Trust N-CEN Annual report (registered investment company)

Form N-CEN Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CEN ANNUAL REPORT FOR REGISTERED INVESTMENT COMPANIES	OMB APPROVAL
Form N-CEN		OMB Number: 3235-0729 Estimated average burden hours per response: 19.04

X0201

N-CEN: Filer Information

Filer CIK	0001140869
Filer CCC	********
Filer Investment Company Type	Form N-1A Filer (Mutual Fund)
Is this a LIVE or TEST Filing?	LIVE TEST
Is this an electronic copy of an official filing submitted in paper format?
Would you like a Return Copy?

Submission Contact Information

Name

Phone

E-Mail Address

Notification Information

Notify via Filing Website only?

N-CEN:Series/Class (Contract) Information

Series ID Record:1

Series ID S000033685

Class ID Record:1

Class ID C000103740

N-CEN:Part A: General Information

Item A.1. Reporting period covered.

a. Report for period ending:	2019-07-31
b. Does this report cover a period of less than 12 months?	Yes No

N-CEN:Part B: Information About the Registrant

Item B.1. Background information.

a. Full name of Registrant	Master Portfolio Trust
b. Investment Company Act file number ( e.g., 811-)	811-10407
c. CIK	0001140869
d. LEI	549300I1QJ6KR2C8FZ09

Item B.2. Address and telephone number of Registrant.

a. Street 1	620 Eighth Avenue
Street 2	49th Floor
b. City	New York
c. State, if applicable	NEW YORK
d. Foreign country, if applicable	UNITED STATES OF AMERICA
e. Zip code and zip code extension, or foreign postal code	10018
f. Telephone number (including country code if foreign)	1-877-721-1926
g. Public Website, if any	N/A

Item B.3. Location of books and records.

Instruction. Provide the requested information for each person maintaining physical possession of each account, book, or other document required to be maintained by section 31(a) of the Act (15 U.S.C. 80a-30(a)) and the rules under that section.

Location books Record: 1
a. Name of person (e.g., a custodian of records)	The Bank of New York Mellon
b. Street 1	240 Greenwich Street
Street 2
c. City	New York
d. State, if applicable	NEW YORK
e. Foreign country, if applicable	UNITED STATES OF AMERICA
f. Zip code and zip code extension, or foreign postal code	10286
g. Telephone number (including country code if foreign)	1-212-495-1784
h. Briefly describe the books and records kept at this location:	Records related to its function as custodian.
Location books Record: 2
a. Name of person (e.g., a custodian of records)	Legg Mason Partners Fund Advisor, LLC
b. Street 1	620 Eighth Avenue
Street 2	47th Floor
c. City	New York
d. State, if applicable	NEW YORK
e. Foreign country, if applicable	UNITED STATES OF AMERICA
f. Zip code and zip code extension, or foreign postal code	10018
g. Telephone number (including country code if foreign)	1-305-529-4400
h. Briefly describe the books and records kept at this location:	Records related to its function as advisor.
Location books Record: 3
a. Name of person (e.g., a custodian of records)	Western Asset Management Company, LLC
b. Street 1	620 Eighth Avenue
Street 2	50th Floor
c. City	New York
d. State, if applicable	NEW YORK
e. Foreign country, if applicable	UNITED STATES OF AMERICA
f. Zip code and zip code extension, or foreign postal code	10018
g. Telephone number (including country code if foreign)	1-212-601-6000
h. Briefly describe the books and records kept at this location:	Records related to its function as sub advisor.
Location books Record: 4
a. Name of person (e.g., a custodian of records)	Legg Mason Investor Services, LLC
b. Street 1	100 International Drive
Street 2
c. City	Baltimore
d. State, if applicable	MARYLAND
e. Foreign country, if applicable	UNITED STATES OF AMERICA
f. Zip code and zip code extension, or foreign postal code	21202
g. Telephone number (including country code if foreign)	1-410-454-2904
h. Briefly describe the books and records kept at this location:	Records related to its function as placement agent.
Location books Record: 5
a. Name of person (e.g., a custodian of records)	Master Portfolio Trust
b. Street 1	620 Eighth Avenue
Street 2	49th Floor
c. City	New York
d. State, if applicable	NEW YORK
e. Foreign country, if applicable	UNITED STATES OF AMERICA
f. Zip code and zip code extension, or foreign postal code	10018
g. Telephone number (including country code if foreign)	1-877-721-1926
h. Briefly describe the books and records kept at this location:	Records related to its function as registrant.

Item B.4. Initial of final filings.

Instruction. Respond "yes" to Item B.4.b only if the Registrant has filed an application to deregister or will file an application to deregister before its next required filing on this form.

a. Is this the first filing on this form by the Registrant?	Yes No
b. Is this the last filing on this form by the Registrant?	Yes No

Item B.5. Family of investment companies.

Instruction. "Family of investment companies" means, except for insurance company separate accounts, any two or more registered investment companies that (i) share the same investment adviser or principal underwriter; and (ii) hold themselves out to investors as related companies for purposes of investment and investor services.In responding to this item, all Registrants in the family of investment companies should report the name of the family of investment companies identically.

Insurance company separate accounts that may not hold themselves out to investors as related companies (products) for purposes of investment and investor services should consider themselves part of the same family if the operational or accounting or control systems under which these entities function are substantially similar.

a. Is the Registrant part of a family of investment companies? Yes No

i. Full name of family of investment companies LEGG MASON

Item B.6. Organization.

Instruction. For Item B.6.a.i., the Registrant should include all Series that have been established by the Registrant and have shares outstanding (other than shares issued in connection with an initial investment to satisfy section 14(a) of the Act).

Indicate the classification of the Registrant by checking the applicable item below.

a. Open-end management investment company registered under the Act on Form N-1A
b. Closed-end management investment company registered under the Act on Form N-2
c. Separate account offering variable annuity contracts which is registered under the Act as a management investment company on Form N-3
d. Separate account offering variable annuity contracts which is registered under the Act as a unit investment trust on Form N-4
e. Small business investment company registered under the Act on Form N-5
f. Separate account offering variable insurance contracts which is registered under the Act as a unit investment trust on Form N-6
g. Unit investment trust registered under the Act on Form N-8B-2

i. Total number of Series of the Registrant	5
ii. If a Series of the Registrant with a fiscal year end covered by the report was terminated during the reporting period, provide the following information:
Terminated Organization Record: 1
i. Name of the Series	Short Term Yield Portfolio
ii. Series identification number	S000033685
iii. Date of termination (month/year)	03/2019

Item B.7. Securities Act registration.

Is the Registrant the issuer of a class of securities registered under the Securities Act of 1933 ("Securities Act")? Yes No

Item B.8. Directors.

Provide the information requested below about each person serving as director of the Registrant (management investment companies only):

Director Record: 1
a. Full Name	Elliott J. Berv
b. CRD number, if any	N/A
c. Is the person an "interested person" of the Registrant as that term is defined in section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19))?	Yes No
d. Investment Company Act file number of any other registered investment company for which the person also serves as a director (e.g., 811-)
File Number Record: 1
File Number Record:	811-06740
File Number Record: 2
File Number Record:	811-06310
File Number Record: 3
File Number Record:	811-05812
File Number Record: 4
File Number Record:	811-04052
File Number Record: 5
File Number Record:	811-04254
Director Record: 2
a. Full Name	Jane Trust
b. CRD number, if any	N/A
c. Is the person an "interested person" of the Registrant as that term is defined in section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19))?	Yes No
d. Investment Company Act file number of any other registered investment company for which the person also serves as a director (e.g., 811-)
File Number Record: 1
File Number Record:	811-23096
File Number Record: 2
File Number Record:	811-22734
File Number Record: 3
File Number Record:	811-22693
File Number Record: 4
File Number Record:	811-22582
File Number Record: 5
File Number Record:	811-22546
File Number Record: 6
File Number Record:	811-22491
File Number Record: 7
File Number Record:	811-22444
File Number Record: 8
File Number Record:	811-22405
File Number Record: 9
File Number Record:	811-22369
File Number Record: 10
File Number Record:	811-22338
File Number Record: 11
File Number Record:	811-22334
File Number Record: 12
File Number Record:	811-22294
File Number Record: 13
File Number Record:	811-22265
File Number Record: 14
File Number Record:	811-21609
File Number Record: 15
File Number Record:	811-21467
File Number Record: 16
File Number Record:	811-21343
File Number Record: 17
File Number Record:	811-21337
File Number Record: 18
File Number Record:	811-21128
File Number Record: 19
File Number Record:	811-10603
File Number Record: 20
File Number Record:	811-08985
File Number Record: 21
File Number Record:	811-08709
File Number Record: 22
File Number Record:	811-07920
File Number Record: 23
File Number Record:	811-07362
File Number Record: 24
File Number Record:	811-06740
File Number Record: 25
File Number Record:	811-06629
File Number Record: 26
File Number Record:	811-06506
File Number Record: 27
File Number Record:	811-06444
File Number Record: 28
File Number Record:	811-06310
File Number Record: 29
File Number Record:	811-05812
File Number Record: 30
File Number Record:	811-05497
File Number Record: 31
File Number Record:	811-04254
File Number Record: 32
File Number Record:	811-04052
File Number Record: 33
File Number Record:	811-02351
Director Record: 3
a. Full Name	Mark T. Finn
b. CRD number, if any	N/A
c. Is the person an "interested person" of the Registrant as that term is defined in section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19))?	Yes No
d. Investment Company Act file number of any other registered investment company for which the person also serves as a director (e.g., 811-)
File Number Record: 1
File Number Record:	811-06740
File Number Record: 2
File Number Record:	811-06310
File Number Record: 3
File Number Record:	811-05812
File Number Record: 4
File Number Record:	811-04052
File Number Record: 5
File Number Record:	811-04254
Director Record: 4
a. Full Name	R. Richardson Pettit
b. CRD number, if any	N/A
c. Is the person an "interested person" of the Registrant as that term is defined in section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19))?	Yes No
d. Investment Company Act file number of any other registered investment company for which the person also serves as a director (e.g., 811-)
File Number Record: 1
File Number Record:	811-06740
File Number Record: 2
File Number Record:	811-06310
File Number Record: 3
File Number Record:	811-05812
File Number Record: 4
File Number Record:	811-04052
File Number Record: 5
File Number Record:	811-04254
Director Record: 5
a. Full Name	Stephen R. Gross
b. CRD number, if any	N/A
c. Is the person an "interested person" of the Registrant as that term is defined in section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19))?	Yes No
d. Investment Company Act file number of any other registered investment company for which the person also serves as a director (e.g., 811-)
File Number Record: 1
File Number Record:	811-23096
File Number Record: 2
File Number Record:	811-21128
File Number Record: 3
File Number Record:	811-06444
File Number Record: 4
File Number Record:	811-06740
File Number Record: 5
File Number Record:	811-06310
File Number Record: 6
File Number Record:	811-05812
File Number Record: 7
File Number Record:	811-04052
File Number Record: 8
File Number Record:	811-04254
Director Record: 6
a. Full Name	Jane F. Dasher
b. CRD number, if any	N/A
c. Is the person an "interested person" of the Registrant as that term is defined in section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19))?	Yes No
d. Investment Company Act file number of any other registered investment company for which the person also serves as a director (e.g., 811-)
File Number Record: 1
File Number Record:	811-06310
File Number Record: 2
File Number Record:	811-05812
File Number Record: 3
File Number Record:	811-04052
File Number Record: 4
File Number Record:	811-04254
File Number Record: 5
File Number Record:	811-06740
Director Record: 7
a. Full Name	Susan B. Kerley
b. CRD number, if any	N/A
c. Is the person an "interested person" of the Registrant as that term is defined in section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19))?	Yes No
d. Investment Company Act file number of any other registered investment company for which the person also serves as a director (e.g., 811-)
File Number Record: 1
File Number Record:	811-03833-01
File Number Record: 2
File Number Record:	811-22551
File Number Record: 3
File Number Record:	811-22321
File Number Record: 4
File Number Record:	811-06740
File Number Record: 5
File Number Record:	811-06310
File Number Record: 6
File Number Record:	811-05812
File Number Record: 7
File Number Record:	811-04550
File Number Record: 8
File Number Record:	811-04052
File Number Record: 9
File Number Record:	811-04254
Director Record: 8
a. Full Name	Susan M. Heilbron
b. CRD number, if any	N/A
c. Is the person an "interested person" of the Registrant as that term is defined in section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19))?	Yes No
d. Investment Company Act file number of any other registered investment company for which the person also serves as a director (e.g., 811-)
File Number Record: 1
File Number Record:	811-23096
File Number Record: 2
File Number Record:	811-21128
File Number Record: 3
File Number Record:	811-06444
File Number Record: 4
File Number Record:	811-06740
File Number Record: 5
File Number Record:	811-06310
File Number Record: 6
File Number Record:	811-05812
File Number Record: 7
File Number Record:	811-04052
File Number Record: 8
File Number Record:	811-04254

Item B.9. Chief compliance officer.

Provide the information requested below about each person serving as chief compliance officer of the Registrant for purposes of rule 38a-1 (17 CFR 270.38a- 1):

Chief compliance officer Record: 1
a. Full Name	Ted P. Becker
b. CRD Number, if any	N/A
c. Street Address 1	620 Eighth Avenue
Street Address 2	49th Floor
d. City	New York
e. State, if applicable	NEW YORK
f. Foreign country, if applicable	UNITED STATES OF AMERICA
g. Zip code and zip code extension, or foreign postal code	10018
h. Telephone number (including country code if foreign)	XXXXXX
i. Has the chief compliance officer changed since the last filing?	Yes No

If the chief compliance officer is compensated or employed by any person other than the Registrant, or an affiliated person of the Registrant, for providing chief compliance officer services, provide:

CCO employer Record: 1
i. Name of the person	N/A
ii. Person's IRS Employer Identification Number	N/A

Item B.10. Matters for security holder vote.

Instruction. Registrants registered on Forms N-3, N-4 or N-6, should respond "yes" to this Item only if security holder votes were solicited on contract-level matters.

Were any matters submitted by the Registrant for its security holders' vote during the reporting period? Yes No

Item B.11. Legal proceeding.

Instruction. For purposes of this Item, the following proceedings should be described: (1) any bankruptcy, receivership or similar proceeding with respect to the Registrant or any of its significant subsidiaries; (2) any proceeding to which any director, officer or other affiliated person of the Registrant is a party adverse to the Registrant or any of its subsidiaries; and (3) any proceeding involving the revocation or suspension of the right of the Registrant to sell securities.

a. Have there been any material legal proceedings, other than routine litigation incidental to the business, to which the Registrant or any of its subsidiaries was a party or of which any of their property was the subject during the reporting period? Yes No

b. Has any proceeding previously reported been terminated? Yes No

Item B.12. Fidelity bond and insurance (management investment companies only).

a. Were any claims with respect to the Registrant filed under a fidelity bond (including, but not limited to, the fidelity insuring agreement of the bond) during the reporting period? Yes No

Item B.13. Directors and officers/errors and omissions insurance (management investment companies only).

a. Are the Registrant's officers or directors covered in their capacities as officers or directors under any directors and officers/errors and omissions insurance policy owned by the Registrant or anyone else?	Yes No
i. If yes, were any claims filed under the policy during the reporting period with respect to the Registrant?	Yes No

Item B.14. Provision of financial support.

Instruction. For purposes of this Item, a provision of financial support includes any (1) capital contribution, (2) purchase of a security from a Money Market Fund in reliance on rule 17a-9 under the Act (17 CFR 270.17a-9), (3) purchase of any defaulted or devalued security at fair value reasonably intended to increase or stabilize the value or liquidity of the Registrant's portfolio, (4) execution of letter of credit or letter of indemnity, (5) capital support agreement (whether or not the Registrant ultimately received support), (6) performance guarantee, or (7) other similar action reasonably intended to increase or stabilize the value or liquidity of the Registrant's portfolio. Provision of financial support does not include any (1) routine waiver of fees or reimbursement of Registrant's expenses, (2) routine inter-fund lending, (3) routine inter-fund purchases of Registrant's shares, or (4) action that would qualify as financial support as defined above, that the board of directors has otherwise determined not to be reasonably intended to increase or stabilize the value or liquidity of the Registrant's portfolio.

Did an affiliated person, promoter, or principal underwriter of the Registrant, or an affiliated person of such a person, provide any form of financial support to the Registrant during the reporting period? Yes No

Item B.15. Exemptive orders.

a. During the reporting period, did the Registrant rely on any orders from the Commission granting an exemption from one or more provisions of the Act, Securities Act or Exchange Act?	Yes No
Release number Record: 1
i. If yes, provide below the release number for each order	IC-19023

Item B.16. Principal underwriters.

a. Provide the information requested below about each principal underwriter:

Principal underwriter Record: 1
i. Full name	Legg Mason Investor Services, LLC
ii. SEC file number (e.g., 8-)	008-53089
iii. CRD number	000109064
iv. LEI, if any	N/A
v. State, if applicable	MARYLAND
vi. Foreign country, if applicable	UNITED STATES OF AMERICA
vii. Is the principal underwriter an affiliated person of the Registrant, or its investment adviser(s) or depositor?	Yes No
b. Have any principal underwriters been hired or terminated during the reporting period?	Yes No

Item B.17. Independent public accountant.

Provide the following information about eachthe independent public accountant:

Public accountant Record: 1
a. Full Name	PricewaterhouseCoopers LLP
b. PCAOB Number	238
c. LEI, if any	5493002GVO7EO8RNNS37
d. State, if applicable	DELAWARE
e. Foreign country, if applicable	UNITED STATES OF AMERICA

f. Has the independent public accountant changed since the last filing? Yes No

Item B.18. Report on internal control (management investment companies only).

Instruction. Small business investment companies are not required to respond to this item.

For the reporting period, did an independent public accountant's report on internal control note any material weaknesses? Yes No

Item B.19. Audit opinion.

For the reporting period, did an independent public accountant issue an opinion other than an unqualified opinion with respect to its audit of the Registrant's financial statements? Yes No

Item B.20. Change in valuation methods.

Instruction. Responses to this item need not include changes to valuation techniques used for individual securities (e.g., changing from market approach to income approach for a private equity security). In responding to Item B.20.c., provide the applicable "asset type" category specified in Item C.4.a. of Form N-PORT. In responding to Item B.20.d., provide a brief description of the type of investments involved. If the change in valuation methods applies only to certain sub-asset types included in the response to Item B.20.c., please provide the sub-asset types in the response to Item B.20.d. The responses to Item B.20.c. and Item B.20.d. should be identical only if the change in valuation methods applies to all assets within that category.

Have there been material changes in the method of valuation (e.g., change from use of bid price to mid price for fixed income securities or change in trigger threshold for use of fair value factors on international equity securities) of the Registrant's assets during the reporting period? Yes No

Item B.21. Change in accounting principles and practices.

Have there been any changes in accounting principles or practices, or any change in the method of applying any such accounting principles or practices, which will materially affect the financial statements filed or to be filed for the current year with the Commission and which has not been previously reported? Yes No

Item B.22. Net asset value error corrections (open-end management investment companies only).

a. During the reporting period, were any payments made to shareholders or shareholder accounts reprocessed as a result of an error in calculating the Registrant's net asset value (or net asset value per share)? Yes No

Item B.23. Rule 19a-1 notice (management investment companies only).

During the reporting period, did the Registrant pay any dividend or make any distribution in the nature of a dividend payment, required to be accompanied by a written statement pursuant to section 19(a) of the Act (15 U.S.C. 80a-19(a)) and rule 19a-1 thereunder (17 CFR 270.19a-1)? Yes No

N-CEN:Part C: Additional Questions for Management Investment Companies

General Instruction.

Management investment companies that offer multiple series must complete Part C as to each series separately, even if some information is the same for two or more series. To begin this section or add an additional series(s), click on the bar labeled "Add a New Series" below.

N-CEN:Part E: Additional Questions for Exchange-Traded Funds and Exchange-Traded Managed Funds

N-CEN:Part G: Attachments

Item G.1a. Attachments.

Attachments applicable to all Registrants. All Registrants shall file the following attachments, as applicable, with the current report. Indicate the attachments filed with the current report by checking the applicable items below: i. Legal proceedings
ii. Provision of financial support
iii. Independent public accountant's report on internal control (management investment companies other than small business investment companies only)
iv. Change in accounting principles and practices
v. Information required to be filed pursuant to exemptive orders
vi. Other information required to be included as an attachment pursuant to Commission rules and regulations

Instructions.

1. Item G.1.a.i. Legal proceedings.

(a) If the Registrant responded "YES" to Item B.11.a., provide a brief description of the proceedings. As part of the description, provide the case or docket number (if any), and the full names of the principal parties to the proceeding.
(b) If the Registrant responded "YES" to Item B.11.b., identify the proceeding and give its date of termination.

2. Item G.1.a.ii. Provision of financial support. If the Registrant responded "YES" to Item B.14., provide the following information (unless the Registrant is a Money Market Fund): (a) Description of nature of support.

(b) Person providing support.

(c) Brief description of relationship between the person providing support and the Registrant.

(d) Date support provided.

(e) Amount of support.

(f) Security supported (if applicable). Disclose the full name of the issuer, the title of the issue (including coupon or yield, if applicable) and at least two identifiers, if available (e.g., CIK, CUSIP, ISIN, LEI).
(g) Value of security supported on date support was initiated (if applicable).

(h) Brief description of reason for support.

(i) Term of support.

(j) Brief description of any contractual restrictions relating to support.

3. Item G.1.a.iii. Independent public accountant's report on internal control (management investment companies other than small business investment companies only). Each management investment company shall furnish a report of its independent public accountant on the company's system of internal accounting controls. The accountant's report shall be based on the review, study and evaluation of the accounting system, internal accounting controls, and procedures for safeguarding securities made during the audit of the financial statements for the reporting period. The report should disclose any material weaknesses in: (a) the accounting system; (b) system of internal accounting control; or (c) procedures for safeguarding securities which exist as of the end of the Registrant's fiscal year.

The accountant's report shall be furnished as an exhibit to the form and shall: (1) be addressed to the Registrant's shareholders and board of directors; (2) be dated; (3) be signed manually; and (4) indicate the city and state where issued.

Attachments that include a report that discloses a material weakness should include an indication by the Registrant of any corrective action taken or proposed.

The fact that an accountant's report is attached to this form shall not be regarded as acknowledging any review of this form by the independent public accountant.

4. Item G.1.a.iv. Change in accounting principles and practices. If the Registrant responded "YES" to Item B.21, provide an attachment that describes the change in accounting principles or practices, or the change in the method of applying any such accounting principles or practices. State the date of the change and the reasons therefor. A letter from the Registrant's independent accountants, approving or otherwise commenting on the change, shall accompany the description.

5. Item G.1.a.v. Information required to be filed pursuant to exemptive orders. File as an attachment any information required to be reported on Form N-CEN or any predecessor form to Form N-CEN (e.g., Form N-SAR) pursuant to exemptive orders issued by the Commission and relied on by the Registrant.

6. Item G.1.a.vi. Other information required to be included as an attachment pursuant to Commission rules and regulations. File as an attachment any other information required to be included as an attachment pursuant to Commission rules and regulations.

N-CEN: Signature

Pursuant to the requirements of the Investment Company Act of 1940, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Registrant	Master Portfolio Trust
Date	2019-10-10
Signature	Christopher Berarducci
Title	Treasurer