Main Street Capital Corporation
US ˙ NYSE ˙ US56035L1044

SecurityMAIN / Main Street Capital Corporation
InstitutionD. E. Shaw & Co., Inc.
ManagerDE Shaw
Latest Disclosed Ownership543,325 shares
Latest Disclosed Value $ 28,774,492
D. E. Shaw & Co., Inc. ownership in MAIN / Main Street Capital Corporation

On May 15, 2026 - D. E. Shaw & Co., Inc. filed a 13F-HR form disclosing ownership of 543,325 shares of Main Street Capital Corporation (US:MAIN) valued at $28,774,492 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 278,534 shares of Main Street Capital Corporation. This represents a change in shares of 95.07% during the quarter. The current value of the position is $27,552,011 USD.

D. E. Shaw & Co., Inc. has a history of taking positions in derivatives of the underlying security (MAIN) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MAIN / Main Street Capital Corporation Historical Put/Call Ratio
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 MAIN STR CAP COM 56035L104 543,325 264,791 95.07 28,774 71.07 0.0127
2026-02-17 2025-12-31 13F MAIN STR CAP COM 56035L104 278,534 176,252 172.32 16,821 158.61 0.0092
2025-11-14 2025-09-30 13F MAIN STR CAP COM 56035L104 102,282 28,325 38.30 6,504 48.83 0.0037
2025-08-14 2025-06-30 13F MAIN STR CAP COM 56035L104 73,957 65,643 789.55 4,371 829.79 0.0031
2025-05-15 2025-03-31 13F MAIN STR CAP COM 56035L104 8,314 8,314 470 0.0004
2025-02-14 2024-12-31 13F MAIN STR CAP COM 56035L104 0 -56,342 -100.00 0 -100.00
2024-11-14 2024-09-30 13F MAIN STR CAP COM 56035L104 56,342 56,342 2,825 0.0024
2024-05-15 2024-03-31 13F MAIN STR CAP COM 56035L104 0 -6,304 -100.00 0 -100.00
2024-02-14 2023-12-31 13F MAIN STR CAP COM 56035L104 6,304 -11,688 -64.96 273 -62.79 0.0002
2023-11-14 2023-09-30 13F MAIN STR CAP COM 56035L104 17,992 3,879 27.49 731 29.61 0.0008
2023-08-14 2023-06-30 13F MAIN STR CAP COM 56035L104 14,113 14,113 565 0.0006
2023-05-15 2023-03-31 13F MAIN STR CAP COM 56035L104 0 -9,423 -100.00 0 -100.00
2023-02-14 2022-12-31 13F MAIN STR CAP COM 56035L104 9,423 9,423 348 0.0004
2022-08-15 2022-06-30 13F MAIN STR CAP COM 56035L104 0 -17,198 -100.00 0 -100.00
2022-05-16 2022-03-31 13F MAIN STR CAP COM 56035L104 17,198 10,276 148.45 733 135.69 0.0007
2022-02-14 2021-12-31 13F MAIN STR CAP COM 56035L104 6,922 6,922 311 0.0003
2021-11-15 2021-09-30 13F MAIN STR CAP COM 56035L104 0 -11,321 -100.00 0 -100.00
2021-08-16 2021-06-30 13F MAIN STR CAP COM 56035L104 11,321 -41,891 -78.72 465 -77.68 0.0004
2021-05-17 2021-03-31 13F MAIN STR CAP COM 56035L104 53,212 -87,153 -62.09 2,083 -54.00 0.0020
2021-02-16 2020-12-31 13F MAIN STR CAP COM 56035L104 140,365 140,365 4,528 0.0040
2020-08-14 2020-06-30 13F MAIN STR CAP COM 56035L104 0 -52,869 -100.00 0 -100.00
2020-05-15 2020-03-31 13F MAIN STR CAP COM 56035L104 52,869 41,566 367.74 1,084 122.59 0.0017
2020-02-14 2019-12-31 13F MAIN STREET CAPITAL COM 56035L104 11,303 -30,457 -72.93 487 -73.00 0.0006
2019-11-14 2019-09-30 13F MAIN STREET CAPITAL COM 56035L104 41,760 36,505 694.67 1,804 735.19 0.0022
2019-08-14 2019-06-30 13F MAIN STREET CAPITAL COM 56035L104 5,255 -16,629 -75.99 216 -73.46 0.0003
2019-05-15 2019-03-31 13F MAIN STREET CAPITAL COM 56035L104 21,884 21,884 814 0.0011
2019-02-14 2018-12-31 13F MAIN STREET CAPITAL COM 56035L104 0 -6,100 -100.00 0 -100.00
2018-11-14 2018-09-30 13F MAIN STREET CAPITAL COM 56035L104 6,100 -27,315 -81.74 235 -81.53 0.0003
2018-08-14 2018-06-30 13F MAIN STREET CAPITAL COM 56035L104 33,415 33,415 1,272 0.0017
2018-05-15 2018-03-31 13F MAIN STREET CAPITAL COM 56035L104 0 -6,178 -100.00 0 -100.00
2018-02-14 2017-12-31 13F MAIN STREET CAPITAL COM 56035L104 6,178 -30,711 -83.25 245 -83.30 0.0003
2017-11-14 2017-09-30 13F MAIN STREET CAPITAL COM 56035L104 36,889 36,889 1,467 0.0023
2017-08-14 2017-06-30 13F MAIN STREET CAPITAL COM 56035L104 0 -24,531 -100.00 0 -100.00
2017-05-15 2017-03-31 13F MAIN STREET CAPITAL COM 56035L104 24,531 -28,268 -53.54 939 -51.65 0.0017
2017-02-14 2016-12-31 13F MAIN STREET CAPITAL COM 56035L104 52,799 24,598 87.22 1,942 100.62 0.0033
2016-11-14 2016-09-30 13F MAIN STREET CAPITAL COM 56035L104 28,201 28,201 0.00 968 0.0017
2015-08-14 2015-06-30 13F MAIN STREET CAPITAL COM 56035L104 0 -33,311 -100.00 0 -100.00
2015-05-15 2015-03-31 13F MAIN STREET CAPITAL COM 56035L104 33,311 2,732 8.93 1,029 2.39 0.0016
2014-05-15 2014-03-31 13F MAIN STREET CAPITAL COM 56035L104 30,579 30,579 -17.01 1,005 -8.88 0.0014
2014-02-14 2013-12-31 13F MAIN STREET CAPITAL COM 56035L104 0 -36,848 -100.00 0 -100.00
2013-11-20 2013-09-30 13F/A-1 MAIN STREET CAPITAL COM 56035L104 36,848 21,905 146.59 1,103 166.43 0.0018
2013-11-14 2013-09-30 13F MAIN STREET CAPITAL COM 56035L104 36,848 1,103
2013-08-14 2013-06-30 13F MAIN STREET CAPITAL COM 56035L104 14,943 14,943 414 0.0008
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2025-11-14 2025-09-30 13F MAIN STR CAP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-14 2025-06-30 13F MAIN STR CAP COM Call 28,600 -14.88 1,690 -11.05 n/a n/a n/a
2025-05-15 2025-03-31 13F MAIN STR CAP COM Call 33,600 1,900 n/a n/a n/a
2013-11-20 2013-09-30 13F/A MAIN STREET CAPITAL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2013-08-14 2013-06-30 13F MAIN STREET CAPITAL COM Call 60,500 1,675 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2014-08-14 2014-06-30 13F MAIN STREET CAPITAL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2014-05-15 2014-03-31 13F MAIN STREET CAPITAL COM Put 50,900 154.50 1,673 201.99 n/a n/a n/a
2013-11-20 2013-09-30 13F/A MAIN STREET CAPITAL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2013-08-14 2013-06-30 13F MAIN STREET CAPITAL COM Put 20,000 554 n/a n/a n/a
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.