Main Street Capital Corporation
Main Street Capital Corporation (MAIN) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MAIN · as of Sep 30, 2025
Ownership Breakdown
420
Institutional Holders
▲ 5 vs Q2
$1.28B
Total Inst. Value
▼ $32.81M vs Q2
92.99M
Shares Outstanding
freeFloat 95.83%
20.06M
13F Shares Held
▲ 290,788 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MAIN largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
PRICE T ROWE ASSOCIATES INC /MD/ | 2.57M | 2.88% | 2.88% | $163.55B | Nov 14, 2025 | ▼ 928.8K |
VAN ECK ASSOCIATES CORP | 2.45M | 2.74% | 2.74% | $155.68B | Nov 13, 2025 | ▲ 1.23M |
MORGAN STANLEY | 986.4K | 1.11% | 1.11% | $62.73B | May 27, 2026 | ▼ 25.6K |
UBS GROUP AG | 866.9K | 97.12% | 97.12% | $55.13B | Nov 13, 2025 | ▲ 534.4K |
LEGAL & GENERAL GROUP PLC | 624.8K | 70.00% | 70.00% | $39.72B | Nov 13, 2025 | ▼ 50.7K |
CITIGROUP INC | 500.0K | 56.02% | 56.02% | $31.80B | Nov 10, 2025 | — held |
ADELL HARRIMAN & CARPENTER INC | 454.5K | 50.92% | 50.92% | $28.90B | Nov 4, 2025 | ▼ 2 |
INVESCO LTD. | 444.6K | 49.81% | 49.81% | $28.27B | Nov 13, 2025 | ▼ 62.7K |
JPMORGAN CHASE & CO | 382.4K | 42.85% | 42.85% | $24.32B | Nov 26, 2025 | ▲ 181.7K |
LPL FINANCIAL LLC | 382.3K | 42.83% | 42.83% | $24.31B | Nov 12, 2025 | ▲ 40.5K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
29
Increased
+2.38M shares1
New Positions
first time holders18
Decreased
−1.66M shares0
Sold Out
fully exitedNet shares change (top 50)
+719.3K
+2.38M / −1.66M
Net new holders
+12
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MAIN insider trading · insider activity
Source: SEC Form 4
39
Buy transactions
8
Sell transactions
4.88
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Lane Brian E. director | May 15, 2026 | J-Other | 192.589 | $50.45 | $9.7K | 52.3K | Form 4 ↗ |
Lane Brian E. director | May 15, 2026 | J-Other | 72.309 | $50.69 | $3.7K | 52.1K | Form 4 ↗ |
Magdol David L. PRESIDENT, CIO AND SMD | May 15, 2026 | J-Other | 64.67 | $50.69 | $3.3K | 440.7K | Form 4 ↗ |
Magdol David L. PRESIDENT, CIO AND SMD | May 15, 2026 | J-Other | 68.343 | $50.65 | $3.5K | 440.6K | Form 4 ↗ |
Griffin Jon Kevin director | May 15, 2026 | J-Other | 259.092 | $50.45 | $13.1K | 73.8K | Form 4 ↗ |
Griffin Jon Kevin director | May 15, 2026 | J-Other | 22.468 | $50.69 | $1.1K | 73.5K | Form 4 ↗ |
McHugh Ryan VP, CAO & Assistant Treasurer | May 15, 2026 | J-Other | 34.824 | $50.69 | $1.8K | 19.9K | Form 4 ↗ |
McHugh Ryan VP, CAO & Assistant Treasurer | May 15, 2026 | J-Other | 41.3 | $50.69 | $2.1K | 19.8K | Form 4 ↗ |
JACKSON JOHN EARL director | May 15, 2026 | J-Other | 252.634 | $50.45 | $12.7K | 84.4K | Form 4 ↗ |
JACKSON JOHN EARL director | May 15, 2026 | J-Other | 98.413 | $50.69 | $5.0K | 84.1K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Main Street Capital Corporation (MAIN) is primarily owned by institutional investors, who hold approximately 21.6% of total shares outstanding. Company insiders own approximately 4.17%, while retail and public investors account for the remaining 74.26%.
The largest institutional shareholder of Main Street Capital Corporation is PRICE T ROWE ASSOCIATES INC /MD/, holding approximately 2.57 million shares — equal to 2.88% of outstanding shares — as of September 30, 2025.
A total of 420 institutional investors currently hold MAIN stock, with a combined institutional value of approximately $1.28 billion as of the most recent 13F filing period.
Frequently asked questions
MAIN ownershipMain Street Capital Corporation (MAIN) is primarily owned by institutional investors, who hold approximately 21.6% of shares. The largest shareholder is PRICE T ROWE ASSOCIATES INC /MD/ with a 2.88% stake. Company insiders hold 4.17%. Data sourced from SEC Form 13F as of September 30, 2025.