Western Asset Investment Grade Opportunity Trust Inc.
US ˙ NYSE ˙ US95790A1016

SecurityIGI / Western Asset Investment Grade Opportunity Trust Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership112,086 shares
Latest Disclosed Value $ 1,803,474
Morgan Stanley reports 4.67% decrease in ownership of IGI / Western Asset Investment Grade Opportunity Trust Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 112,086 shares of Western Asset Investment Grade Opportunity Trust Inc. (US:IGI) valued at $1,803,464 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 117,579 shares of Western Asset Investment Grade Opportunity Trust Inc.. This represents a change in shares of -4.67% during the quarter. The current value of the position is $1,788,893 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F WESTERN ASSET INVT GRADE OPP COM 95790A101 112,086 -5,493 -4.67 1,803 -7.06 0.0001
2026-05-27 2025-12-31 13F/A-1 WESTERN ASSET INVT GRADE OPP COM 95790A101 117,579 189 0.16 1,940 -0.97 0.0001
2026-02-13 2025-12-31 13F WESTERN ASSET INVT GRADE OPP COM 95790A101 117,579 189 1,940 0.0001
2026-05-27 2025-09-30 13F/A-1 WESTERN ASSET INVT GRADE OPP COM 95790A101 117,390 -5,759 -4.68 1,959 -4.02 0.0001
2025-11-14 2025-09-30 13F WESTERN ASSET INVT GRADE OPP COM 95790A101 117,390 -5,759 1,959 0.0001
2025-08-15 2025-06-30 13F WESTERN ASSET INVT GRADE OPP COM 95790A101 123,149 -1,936 -1.55 2,042 -1.54 0.0001
2025-05-15 2025-03-31 13F WESTERN ASSET INVT GRADE OPP COM 95790A101 125,085 -4,532 -3.50 2,074 -1.94 0.0001
2025-05-15 2024-12-31 13F/A-1 WESTERN ASSET INVT GRADE OPP COM 95790A101 129,617 -12,590 -8.85 2,114 -17.39 0.0001
2025-02-14 2024-12-31 13F WESTERN ASSET INVT GRADE OPP COM 95790A101 129,617 -12,590 2,114 0.0001
2025-05-14 2024-09-30 13F/A-2 WESTERN ASSET INVT GRADE DEF COM 95790A101 142,207 -12,518 -8.09 2,560 -3.14 0.0002
2025-02-14 2024-09-30 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 142,207 -12,518 2,560 0.0002
2024-11-14 2024-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 142,207 -12,518 2,560 0.0000
2025-05-14 2024-06-30 13F/A-2 WESTERN ASSET INVT GRADE DEF COM 95790A101 154,725 -10,044 -6.10 2,643 -7.23 0.0002
2024-10-17 2024-06-30 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 154,725 -10,044 2,643 0.0002
2024-08-14 2024-06-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 154,725 -10,044 2,643 0.0002
2024-10-17 2024-03-31 13F/A-2 WESTERN ASSET INVT GRADE DEF COM 95790A101 164,769 -10,695 -6.10 2,849 -7.65 0.0002
2024-08-16 2024-03-31 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 164,769 -10,695 2,849 0.0000
2024-05-15 2024-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 164,769 -10,695 2,849 0.0002
2024-08-16 2023-12-31 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 175,464 -13,049 -6.92 3,085 3.35 0.0003
2024-02-13 2023-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 175,464 -13,049 3,085 0.0003
2023-11-15 2023-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 188,513 -42,398 -18.36 2,984 -20.81 0.0003
2023-08-14 2023-06-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 230,911 -63,012 -21.44 3,768 -24.28 0.0004
2023-05-15 2023-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 293,923 -79,204 -21.23 4,976 -18.08 0.0005
2023-02-14 2022-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 373,127 -26,322 -6.59 6,075 -0.62 0.0007
2022-11-14 2022-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 399,449 -71,572 -15.20 6,112 -23.08 0.0008
2022-10-27 2022-06-30 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 471,021 178,639 61.10 7,946 45.19 0.0010
2022-08-15 2022-06-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 471,021 178,639 7,946 0.0002
2022-10-27 2022-03-31 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 292,382 131,621 81.87 5,473 55.75 0.0007
2022-05-13 2022-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 292,382 131,621 5,473 0.0007
2022-02-14 2021-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 160,761 -9,650 -5.66 3,514 -6.64 0.0004
2021-11-15 2021-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 170,411 9,582 5.96 3,764 6.33 0.0005
2021-08-23 2021-06-30 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 160,829 1,142 0.72 3,540 3.54 0.0005
2021-08-16 2021-06-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 160,829 1,142 3,540 0.0001
2021-05-17 2021-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 159,687 -6,783 -4.07 3,419 -8.14 0.0005
2021-02-16 2020-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 166,470 15,617 10.35 3,722 18.95 0.0006
2020-11-13 2020-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 150,853 -4,562 -2.94 3,129 -6.93 0.0006
2020-08-14 2020-06-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 155,415 10,972 7.60 3,362 24.20 0.0007
2020-05-26 2020-03-31 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 144,443 18,557 14.74 2,707 -6.10 0.0007
2020-05-15 2020-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 144,443 18,557 2,707 207.9540
2020-02-14 2019-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 125,886 5,952 4.96 2,883 12.14 0.0007
2019-11-14 2019-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 119,934 -3,248 -2.64 2,571 -0.31 0.0007
2019-08-14 2019-06-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 123,182 -2,707 -2.15 2,579 2.18 0.0007
2019-05-15 2019-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 125,889 940 0.75 2,524 8.84 0.0007
2019-02-14 2018-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 124,949 883 0.71 2,319 -10.46 0.0007
2019-04-23 2018-09-30 13F/A-2 WESTERN ASSET INVT GRADE DEF COM 95790A101 124,066 -1,241 -0.99 2,590 -1.33 0.0006
2018-11-20 2018-09-30 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 124,066 0 2,590 0.0006
2018-11-14 2018-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 124,066 2,590
2019-04-23 2018-06-30 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 125,307 -2,558 -2.00 2,625 -3.92 0.0007
2018-08-14 2018-06-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 125,307 2,625
2019-04-23 2018-03-31 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 127,865 2,130 1.69 2,732 -4.94 0.0008
2018-05-14 2018-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 127,865 2,732
2019-04-23 2017-12-31 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 125,735 5,549 4.62 2,874 12.71 0.0008
2018-02-14 2017-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 125,735 2,874
2017-11-14 2017-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 120,186 2,333 1.98 2,550 -0.62 0.0008
2017-08-11 2017-06-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 117,853 -3,347 -2.76 2,566 3.89 0.0008
2017-05-22 2017-03-31 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 121,200 -1,295 -1.06 2,470 -1.12 0.0008
2017-05-12 2017-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 121,200 2,470
2017-02-22 2016-12-31 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 122,495 9,054 7.98 2,498 -2.54 0.0008
2017-02-13 2016-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 122,495 2,498
2016-11-10 2016-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 113,441 13,313 13.30 2,563 18.71 0.0009
2016-08-12 2016-06-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 100,128 10,062 11.17 2,159 14.48 0.0008
2016-05-12 2016-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 90,066 501 0.56 1,886 4.37 0.0007
2016-02-09 2015-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 89,565 1,385 1.57 1,807 0.06 0.0007
2016-02-08 2015-09-30 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 88,180 -5,319 -5.69 1,806 -4.65 0.0007
2015-11-09 2015-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 88,180 1,806
2015-08-12 2015-06-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 93,499 2,728 3.01 1,894 -0.32 0.0007
2015-05-14 2015-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 90,771 -2,359 -2.53 1,900 -2.86 0.0007
2015-02-13 2014-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 93,130 5,411 6.17 1,956 9.95 0.0007
2014-12-16 2014-09-30 13F/A-1 WESTERN ASSET INVT GRADE DEF COM 95790A101 87,719 8,298 10.45 1,779 11.05 0.0007
2014-11-14 2014-09-30 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 87,719 1,779
2014-05-13 2014-03-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 79,421 5,371 7.25 1,602 7.09 0.0007
2014-02-13 2013-12-31 13F WESTERN ASSET INVT GRADE DEF COM 95790A101 74,050 10,915 17.29 1,496 20.65 0.0006
2013-11-13 2013-09-30 13F WSTRN AST INV GR COM 95790A101 63,135 -4,829 -7.11 1,240 -13.23 0.0006
2013-08-08 2013-06-30 13F WSTRN AST INV GR COM 95790A101 67,964 67,964 1,429 0.0007
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.