PIMCO Corporate & Income Opportunity Fund
US ˙ NYSE ˙ US72201B1017

SecurityPTY / PIMCO Corporate & Income Opportunity Fund
InstitutionMorgan Stanley
Latest Disclosed Ownership2,579,936 shares
Latest Disclosed Value $ 31,114,043
Morgan Stanley reports 2.51% increase in ownership of PTY / PIMCO Corporate & Income Opportunity Fund

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 2,579,936 shares of PIMCO Corporate & Income Opportunity Fund (US:PTY) valued at $31,114,028 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 2,516,693 shares of PIMCO Corporate & Income Opportunity Fund. This represents a change in shares of 2.51% during the quarter. The current value of the position is $30,623,840 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 PIMCO CORPORATE & INCOME OPP COM 72201B101 2,579,936 63,243 2.51 31,114 -4.16 0.0019
2026-05-27 2025-12-31 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 2,516,693 -77,453 -2.99 32,465 -13.33 0.0019
2026-02-13 2025-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 2,516,693 -77,453 32,465 0.0019
2026-05-27 2025-09-30 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 2,594,146 25,445 0.99 37,459 4.84 0.0023
2025-11-14 2025-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 2,594,146 25,445 37,459 0.0023
2025-08-15 2025-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 2,568,701 56,750 2.26 35,731 -1.63 0.0023
2025-05-15 2025-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 2,511,951 -24,900 -0.98 36,323 -0.36 0.0026
2025-05-15 2024-12-31 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 2,536,851 274,564 12.14 36,455 11.98 0.0026
2025-02-14 2024-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 2,536,851 274,564 36,455 0.0026
2025-05-14 2024-09-30 13F/A-2 PIMCO CORPORATE & INCOME OPP COM 72201B101 2,262,287 133,026 6.25 32,554 6.84 0.0024
2025-02-14 2024-09-30 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 2,262,287 133,026 32,554 0.0024
2024-11-14 2024-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 2,262,287 133,026 32,554 0.0024
2025-05-14 2024-06-30 13F/A-2 PIMCO CORPORATE & INCOME OPP COM 72201B101 2,129,261 162,627 8.27 30,470 4.19 0.0024
2024-10-17 2024-06-30 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 2,129,261 162,627 30,470 0.0024
2024-08-14 2024-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 2,129,261 162,627 30,470 0.0024
2024-10-17 2024-03-31 13F/A-2 PIMCO CORPORATE & INCOME OPP COM 72201B101 1,966,634 100,174 5.37 29,244 18.34 0.0023
2024-08-16 2024-03-31 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 1,966,634 100,174 29,244 0.0003
2024-05-15 2024-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,966,634 100,174 29,244 0.0023
2024-08-16 2023-12-31 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 1,866,460 128,317 7.38 24,712 8.78 0.0022
2024-02-13 2023-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,866,460 128,317 24,712 0.0022
2023-11-15 2023-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,738,143 139,403 8.72 22,718 1.50 0.0023
2023-08-14 2023-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,598,740 63,936 4.17 22,382 16.94 0.0022
2023-05-15 2023-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,534,804 66,582 4.53 19,139 8.54 0.0021
2023-02-14 2022-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,468,222 119,392 8.85 17,633 11.26 0.0020
2022-11-14 2022-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,348,830 20,089 1.51 15,849 -4.65 0.0022
2022-10-27 2022-06-30 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 1,328,741 168,577 14.53 16,622 -6.67 0.0022
2022-08-15 2022-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,328,741 168,577 16,622 0.0022
2022-10-27 2022-03-31 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 1,160,164 10,168 0.88 17,809 -6.37 0.0024
2022-05-13 2022-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,160,164 10,168 17,809 0.0024
2022-02-14 2021-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,149,996 -67,468 -5.54 19,021 -14.58 0.0023
2021-11-15 2021-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,217,464 134,123 12.38 22,267 3.86 0.0030
2021-08-23 2021-06-30 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 1,083,341 -896 -0.08 21,439 8.23 0.0028
2021-08-16 2021-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,083,341 -896 21,439 0.0006
2021-05-17 2021-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,084,237 -160,275 -12.88 19,809 -10.83 0.0029
2021-02-16 2020-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,244,512 256,795 26.00 22,214 39.43 0.0034
2020-11-13 2020-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 987,717 46,447 4.93 15,932 9.13 0.0031
2020-08-14 2020-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 941,270 144,871 18.19 14,599 41.99 0.0032
2020-05-26 2020-03-31 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 796,399 -117,881 -12.89 10,282 -40.81 0.0028
2020-05-15 2020-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 796,399 -117,881 10,282 789.8719
2020-02-14 2019-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 914,280 -64,340 -6.57 17,371 -2.15 0.0040
2019-11-14 2019-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 978,620 -78,524 -7.43 17,752 -7.43 0.0047
2019-08-14 2019-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 1,057,144 95,429 9.92 19,177 14.01 0.0051
2019-05-15 2019-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 961,715 122,227 14.56 16,820 30.61 0.0048
2019-02-14 2018-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 839,488 -7,444 -0.88 12,878 -14.82 0.0039
2019-04-23 2018-09-30 13F/A-2 PIMCO CORPORATE & INCOME OPP COM 72201B101 846,932 10,084 1.20 15,118 3.29 0.0038
2018-11-20 2018-09-30 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 846,932 0 15,118 0.0038
2018-11-14 2018-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 846,932 10,084 15,118
2019-04-23 2018-06-30 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 836,848 137,284 19.62 14,637 23.65 0.0040
2018-08-14 2018-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 836,848 137,284 14,637
2019-04-23 2018-03-31 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 699,564 105,294 17.72 11,837 21.01 0.0033
2018-05-14 2018-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 699,564 105,294 11,837
2019-04-23 2017-12-31 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 594,270 -17,406 -2.85 9,782 -4.70 0.0027
2018-02-14 2017-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 594,270 -17,406 9,782
2017-11-14 2017-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 611,676 57,998 10.48 10,264 12.56 0.0031
2017-08-11 2017-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 553,678 51,168 10.18 9,119 15.59 0.0028
2017-05-22 2017-03-31 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 502,510 -11,104 -2.16 7,889 7.33 0.0024
2017-05-12 2017-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 502,510 7,889
2017-02-22 2016-12-31 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 513,614 14,189 2.84 7,350 0.74 0.0024
2017-02-13 2016-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 513,614 7,350
2016-11-10 2016-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 499,425 -125,947 -20.14 7,296 -17.19 0.0025
2016-08-12 2016-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 625,372 8,623 1.40 8,811 4.82 0.0032
2016-05-12 2016-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 616,749 -228,620 -27.04 8,406 -25.47 0.0032
2016-02-09 2015-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 845,369 404,367 91.69 11,278 92.29 0.0041
2016-02-08 2015-09-30 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 441,002 -6,332 -1.42 5,865 -9.45 0.0022
2015-11-09 2015-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 441,002 5,865
2015-08-12 2015-06-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 447,334 29,492 7.06 6,477 -1.70 0.0022
2015-05-14 2015-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 417,842 -1,672 -0.40 6,589 -1.21 0.0024
2015-02-13 2014-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 419,514 -13,315 -3.08 6,670 -9.67 0.0024
2014-12-16 2014-09-30 13F/A-1 PIMCO CORPORATE & INCOME OPP COM 72201B101 432,829 61,304 16.50 7,384 10.04 0.0028
2014-11-14 2014-09-30 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 432,829 7,384
2014-05-13 2014-03-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 371,525 -43,838 -10.55 6,710 -6.40 0.0028
2014-02-13 2013-12-31 13F PIMCO CORPORATE & INCOME OPP COM 72201B101 415,363 -28,192 -6.36 7,169 -10.44 0.0030
2013-11-13 2013-09-30 13F PIMCO CORPORATE OPPORTUNITY COM 72201B101 443,555 -67,924 -13.28 8,005 -19.94 0.0038
2013-08-08 2013-06-30 13F PIMCO CORPORATE OPPORTUNITY COM 72201B101 511,479 511,479 9,999 0.0050
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.