Main Street Capital Corporation
US ˙ NYSE ˙ US56035L1044

SecurityMAIN / Main Street Capital Corporation
InstitutionSigma Planning Corp
Latest Disclosed Ownership35,492 shares
Latest Disclosed Value $ 1,879,660
Sigma Planning Corp reports 3.13% decrease in ownership of MAIN / Main Street Capital Corporation

On May 4, 2026 - Sigma Planning Corp filed a 13F-HR form disclosing ownership of 35,492 shares of Main Street Capital Corporation (US:MAIN) valued at $1,879,656 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 36,640 shares of Main Street Capital Corporation. This represents a change in shares of -3.13% during the quarter. The current value of the position is $1,799,799 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)
2026-05-04 2026-03-31 13F MAIN STR CAP COM 56035L104 35,492 -1,148 -3.13 1,880 -15.05 0.0522
2026-01-30 2025-12-31 13F MAIN STR CAP COM 56035L104 36,640 -1,476 -3.87 2,213 -8.71 0.0611
2025-11-10 2025-09-30 13F MAIN STR CAP COM 56035L104 38,116 -5,732 -13.07 2,424 -6.48 0.0689
2025-08-05 2025-06-30 13F MAIN STR CAP COM 56035L104 43,848 -1,094 -2.43 2,591 1.97 0.0779
2025-05-02 2025-03-31 13F MAIN STR CAP COM 56035L104 44,942 236 0.53 2,542 -2.94 0.0811
2025-02-03 2024-12-31 13F MAIN STR CAP COM 56035L104 44,706 4,342 10.76 2,619 29.41 0.0822
2024-11-04 2024-09-30 13F MAIN STR CAP COM 56035L104 40,364 2,621 6.94 2,024 6.19 0.0620
2024-08-06 2024-06-30 13F MAIN STR CAP COM 56035L104 37,743 -175 -0.46 1,906 6.25 0.0604
2024-05-02 2024-03-31 13F MAIN STR CAP COM 56035L104 37,918 22,420 144.66 1,794 168.01 0.0564
2024-02-01 2023-12-31 13F MAIN STR CAP COM 56035L104 15,498 -25,709 -62.39 670 -60.04 0.0524
2023-11-06 2023-09-30 13F MAIN STR CAP COM 56035L104 41,207 3,544 9.41 1,674 11.08 0.0628
2023-08-02 2023-06-30 13F MAIN STR CAP COM 56035L104 37,663 -352 -0.93 1,508 0.47 0.0541
2023-05-08 2023-03-31 13F MAIN STR CAP COM 56035L104 38,015 -77 -0.20 1,500 6.61 0.0498
2023-01-24 2022-12-31 13F MAIN STR CAP COM 56035L104 38,092 -1,154 -2.94 1,408 6.59 0.0503
2022-11-10 2022-09-30 13F MAIN STR CAP COM 56035L104 39,246 434 1.12 1,320 -11.71 0.0503
2022-08-11 2022-06-30 13F MAIN STR CAP COM 56035L104 38,812 -1,897 -4.66 1,495 -13.88 0.0520
2022-04-20 2022-03-31 13F MAIN STR CAP COM 56035L104 40,709 -34 -0.08 1,736 -5.03 0.0520
2022-02-02 2021-12-31 13F MAIN STR CAP CORP COM CEF 56035L104 40,743 -1,332 -3.17 1,828 5.73 0.0509
2021-10-28 2021-09-30 13F MAIN STR CAP COM 56035L104 42,075 -485 -1.14 1,729 -1.14 0.0520
2021-08-13 2021-06-30 13F MAIN STR CAP CORP COM CEF 56035L104 42,560 4,557 11.99 1,749 17.54 0.0521
2021-05-06 2021-03-31 13F MAIN STR CAP CORP COM CEF 56035L104 38,003 3,249 9.35 1,488 32.74 0.0475
2021-02-09 2020-12-31 13F MAIN STR CAP COM 56035L104 34,754 -7,980 -18.67 1,121 -11.31 0.0381
2020-11-03 2020-09-30 13F MAIN STR CAP COM 56035L104 42,734 -2,795 -6.14 1,264 -10.80 0.0500
2020-07-31 2020-06-30 13F MAIN STR CAP COM 56035L104 45,529 1,748 3.99 1,417 57.80 0.0622
2020-05-01 2020-03-31 13F MAIN STR CAP COM 56035L104 43,781 907 2.12 898 -51.41 0.0533
2020-02-03 2019-12-31 13F MAIN STREET CAPITAL COM 56035L104 42,874 3,464 8.79 1,848 8.51 0.0780
2019-11-01 2019-09-30 13F MAIN STREET CAPITAL COM 56035L104 39,410 19,576 98.70 1,703 108.70 0.0817
2019-08-01 2019-06-30 13F MAIN STREET CAPITAL COM 56035L104 19,834 1,091 5.82 816 17.07 0.0420
2019-05-01 2019-03-31 13F MAIN STREET CAPITAL COM 56035L104 18,743 -4,148 -18.12 697 -9.95 0.0396
2019-01-31 2018-12-31 13F MAIN STREET CAPITAL COM 56035L104 22,891 -3,885 -14.51 774 -24.93 0.0563
2018-11-07 2018-09-30 13F MAIN STREET CAPITAL COM 56035L104 26,776 94 0.35 1,031 1.48 0.0606
2018-08-02 2018-06-30 13F MAIN STREET CAPITAL COM 56035L104 26,682 -7,152 -21.14 1,016 -18.59 0.0680
2018-05-11 2018-03-31 13F MAIN STREET CAPITAL COM 56035L104 33,834 -6,965 -17.07 1,248 -23.01 0.0912
2018-02-07 2017-12-31 13F MAIN STREET CAPITAL COM 56035L104 40,799 3,810 10.30 1,621 10.27 0.1249
2017-11-06 2017-09-30 13F MAIN STREET CAPITAL COM 56035L104 36,989 9,693 35.51 1,470 40.00 0.1212
2017-08-02 2017-06-30 13F MAIN STREET CAPITAL COM 56035L104 27,296 -1,718 -5.92 1,050 -5.41 0.0987
2017-04-24 2017-03-31 13F MAIN STREET CAPITAL COM 56035L104 29,014 9,881 51.64 1,110 57.67 0.1075
2017-01-23 2016-12-31 13F MAIN STREET CAPITAL COM 56035L104 19,133 7,234 60.80 704 72.13 0.0769
2016-11-07 2016-09-30 13F MAIN STREET CAPITAL COM 56035L104 11,899 717 6.41 409 11.44 0.0485
2016-07-22 2016-06-30 13F MAIN STREET CAPITAL COM 56035L104 11,182 2,672 31.40 367 37.45 0.0478
2016-04-18 2016-03-31 13F MAIN STREET CAPITAL COM 56035L104 8,510 -680 -7.40 267 0.00 0.0365
2016-01-20 2015-12-31 13F MAIN STREET CAPITAL COM 56035L104 9,190 -1,980 -17.73 267 -10.40 0.0374
2015-11-02 2015-09-30 13F MAIN STREET CAPITAL COM 56035L104 11,170 -866 -7.20 298 -22.40 0.0472
2015-07-14 2015-06-30 13F MAIN STREET CAPITAL COM 56035L104 12,036 -362 -2.92 384 0.26 0.0530
2015-04-23 2015-03-31 13F MAIN STREET CAPITAL COM 56035L104 12,398 -3,342 -21.23 383 -16.74 0.0507
2015-02-13 2014-12-31 13F MAIN STREET CAPITAL COM 56035L104 15,740 15,740 460 0.0608
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.