Form D · Hedge Fund

WESTERN ASSET MORTGAGE BACKED SECURITIES PORTFOLIO, L.L.C.

Pasadena, CA · CIK 0001459359

Offering snapshot reported Apr 29, 2026 · SEC filing

Reported sold
$220M
Indefinite offering
Investors reported
3
Form D · investor count
Minimum accepted
$0
Reported outside-investor minimum
First sale
Dec 1, 2004
As reported in this filing

Fundraising history

Reported sold
Reported amount sold by Form D filing date$0$1.51B$3.01BApr 7, 2010: $3,012,478,790.00Apr 7, 2010Apr 7, 2011: $2,350,278,203.00Apr 6, 2012: $2,289,016,563.00Apr 8, 2013: $2,532,194,705.00Apr 8, 2014: $2,090,250,806.00Apr 8, 2015: $1,852,226,592.00Apr 12, 2016: $1,600,725,464.00Apr 14, 2017: $1,966,993,779.00Apr 5, 2018: $2,233,540,708.00Apr 5, 2019: $2,446,152,866.00Mar 26, 2020: $2,420,455,476.00Mar 24, 2021: $1,726,538,875.00Apr 7, 2022: $1,476,103,041.00Apr 10, 2023: $1,163,088,652.00Apr 23, 2024: $1,148,186,114.00Apr 23, 2025: $559,269,111.00Apr 29, 2026: $219,777,062.00Apr 29, 2026

Dates are filing dates, not cash receipt dates. Decreases are reported revisions, not evidence of withdrawals. Separate offering histories are not added together.

What changed?

Latest filing versus its linked predecessor, where available.

  • Reported sold$559,269,111 → $219,777,062
  • Reported investors12 → 3

Filing history

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FiledFiling typeReported soldChange vs linked filingInvestorsSource
Apr 29, 2026Amendment$219,777,062-$339,492,049vs Apr 23, 20253SEC filing
Apr 23, 2025Amendment$559,269,111-$588,917,003vs Apr 23, 202412SEC filing
Apr 23, 2024Amendment$1,148,186,114-$14,902,538vs Apr 10, 202322SEC filing
Apr 10, 2023Amendment$1,163,088,652-$313,014,389vs Apr 7, 202223SEC filing
Apr 7, 2022Amendment$1,476,103,041-$250,435,834vs Mar 24, 202128SEC filing
Mar 24, 2021Amendment$1,726,538,875-$693,916,601vs Mar 26, 202031SEC filing
Mar 26, 2020Amendment$2,420,455,476-$25,697,390vs Apr 5, 201931SEC filing
Apr 5, 2019Amendment$2,446,152,866$212,612,158vs Apr 5, 201833SEC filing
Apr 5, 2018Amendment$2,233,540,708$266,546,929vs Apr 14, 201731SEC filing
Apr 14, 2017Amendment$1,966,993,779$366,268,315vs Apr 12, 201629SEC filing
Apr 12, 2016Amendment$1,600,725,464-$251,501,128vs Apr 8, 201528SEC filing
Apr 8, 2015Amendment$1,852,226,592-$238,024,214vs Apr 8, 201428SEC filing
Apr 8, 2014Amendment$2,090,250,806-$441,943,899vs Apr 8, 201331SEC filing
Apr 8, 2013Amendment$2,532,194,705$243,178,142vs Apr 6, 201237SEC filing
Apr 6, 2012Amendment$2,289,016,563-$61,261,640vs Apr 7, 201134SEC filing
Apr 7, 2011Amendment$2,350,278,203-$662,200,587vs Apr 7, 201035SEC filing
Apr 7, 2010Amendment$3,012,478,790No comparison42SEC filing

Offering details

Securities
Pooled investment fund
Exemptions
06b, 3C, 3C.7
Duration over one year
Yes
Business combination
No
Sales commissions
$0
Finders' fees
$0
Form D file number
021-128543
OFFERS AND SALES OF THE FUND WILL BE MADE BY AND THROUGH FRANKLIN DISTRIBUTORS, LLC. HOWEVER, FRANKLIN DISTRIBUTORS, LLC WILL NOT RECEIVE ANY SALES COMMISSIONS FOR ITS SERVICES.

Sales compensation recipients

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RecipientCRDAssociated broker-dealer
FRANKLIN DISTRIBUTORS, LLC109064

Source: Form D, filed Apr 29, 2026. Minimum accepted may differ from a standard advertised minimum.

Fund connections

No confirmed ADV fund connection is available for this issuer.

People & organizations

Current and past Form D appearances. These existing records do not establish a person's current role or uniquely identify them across issuers.

People and organizations reported in Form D filings
NameReported role
Company Western Asset Management Promoter
N/A Western Asset Management Company Promoter
N/A Western Asset Management Company, Llc Promoter

Issuer details

Industry: Pooled Investment Fund (See others in industry)

Address:
C/O Western Asset Management Co 385 East Colorado Blvd
Pasadena, CA, 91101