Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in MAIN held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | UBS Group AG | 1.3M | $70.9M | +118.8% | 1.440% | 0.01% |
| 2 | MORGAN STANLEY | 855K | $45.3M | -1.5% | 0.919% | 0.00% |
| 3 | Legal & General Group Plc | 784K | $41.5M | +8.9% | 0.843% | 0.01% |
| 4 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 608K | $32.2M | +56.7% | 0.654% | 0.00% |
| 5 | D. E. Shaw & Co., Inc. | 543K | $28.8M | +95.1% | 0.584% | 0.03% |
| 6 | TWO SIGMA INVESTMENTS, LP | 524K | $27.8M | +623.7% | 0.564% | 0.02% |
| 7 | Qube Research & Technologies Ltd | 486K | $25.7M | +155.8% | 0.522% | 0.03% |
| 8 | Muzinich & Co., Inc. | 485K | $25.7M | +10.2% | 0.521% | 8.98% |
| 9 | ADELL HARRIMAN & CARPENTER INC | 485K | $25.7M | +1.3% | 0.521% | 1.57% |
| 10 | Invesco Ltd. | 432K | $22.9M | +3.0% | 0.465% | 0.00% |
| 11 | BlackRock, Inc. | 424K | $22.5M | +101.9% | 0.456% | 0.00% |
| 12 | Sumitomo Mitsui Trust Holdings, Inc. | 371K | $19.6M | +4.2% | 0.398% | 0.01% |
| 13 | MILLENNIUM MANAGEMENT LLC | 360K | $19.1M | -7.5% | 0.387% | 0.01% |
| 14 | LPL Financial LLC | 348K | $18.4M | -0.1% | 0.374% | 0.00% |
| 15 | FRANKLIN RESOURCES INC | 321K | $17.0M | +6.3% | 0.345% | 0.00% |
| 16 | GOLDMAN SACHS GROUP INC | 313K | $16.6M | -12.2% | 0.337% | 0.00% |
| 17 | CHILDRESS CAPITAL ADVISORS, LLC | 294K | $15.6M | 0.0% | 0.316% | 2.81% |
| 18 | RAYMOND JAMES FINANCIAL INC | 264K | $13.9M | +4.3% | 0.284% | 0.00% |
| 19 | CITIGROUP INC | 256K | $13.6M | -48.9% | 0.275% | 0.01% |
| 20 | SANDERS MORRIS HARRIS LLC | 237K | $12.6M | — | 0.255% | 1.99% |
| 21 | Trinity Legacy Partners, LLC | 203K | $11.5M | +6.1% | 0.218% | 2.48% |
| 22 | MARSHALL WACE, LLP | 205K | $10.9M | — | 0.221% | 0.01% |
| 23 | Private Advisor Group, LLC | 170K | $9.0M | -1.7% | 0.183% | 0.04% |
| 24 | ADVISOR GROUP HOLDINGS, INC. | 170K | $9.0M | -0.6% | 0.182% | 0.01% |
| 25 | BENJAMIN EDWARDS INC | 154K | $8.1M | -2.1% | 0.165% | 0.08% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in MAIN — a direct measure of their conviction.
Filings activity in MAIN during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 416 | 0.5% | 20.09% | 1.15 pp | $972M | 5.4% |
| Q4 2025 | 418 | +5.3% | 21.24% | +1.85 pp | $1.03B | +9.5% |
| Q3 2025 | 397 | +0.3% | 19.39% | 1.50 pp | $938M | 7.2% |
| Q2 2025 | 396 | +3.9% | 20.89% | +4.78 pp | $1.01B | +30% |
| Q1 2025 | 381 | 3.8% | 16.11% | 3.77 pp | $779M | 19% |
| Q4 2024 | 396 | +15% | 19.88% | +6.27 pp | $962M | +46% |
| Q3 2024 | 344 | +4.6% | 13.61% | +1.32 pp | $658M | +11% |
| Q2 2024 | 329 | — | 12.29% | — | $594M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying MAIN stock.
Based on Q1 2026 13F filings, institutional ownership of Main Street Capital Corporation stands at 20.1%, held across 416 reporting institutions.
UBS Group AG is the largest reported institutional holder of MAIN, with approximately 1,338,812 shares worth $0.07B as of Q1 2026.
Yes — 3 widely-followed marquee investors appear among the top 25 institutional holders of MAIN, including SUSQUEHANNA INTERNATIONAL GROUP, LLP, TWO SIGMA INVESTMENTS, LP, MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for MAIN is 47 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
65 institutions opened new positions in MAIN during Q1 2026, while 67 fully exited. 61 added to existing positions and 286 trimmed.
MAIN institutional ownership fell by 1.15 percentage points quarter-over-quarter, with a net change of -2 holders.
The top 10 institutions account for 35.6% of all reported 13F value in MAIN, and the top 25 account for 58.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Main Street Capital Corporation (MAIN) Institutional Ownership