John Marshall Bancorp, Inc. (JMSB) Ownership
JMSB ownership summary
as of October 18, 2026- Institutions
- 50.5% of shares outstanding
- Insiders
- 12.47% of shares outstanding
- Shares outstanding
- 14.1M
- Float
- 12.3M shares available to trade
- Short interest
- 3.39% 352K shares short
- Days to cover
- 4.29 short interest up 3.6% vs prior month
- Institutions 50.47%
- Insiders 12.47%
- Other investors 37.06%
JMSB top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | T. Rowe Price Investment Management,Inc. | 13.93% | 2.0M | $45.0M | — | June 30, 2026 |
| 2 | BlackRock Inc | 6.98% | 984K | $22.5M | +109,048 (+12.5%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 3.79% | 535K | $12.2M | −2,806 (−0.5%) | June 30, 2026 |
| 4 | Ayrshire Associates Inc | 2.49% | 351K | $8.0M | +1,180 (+0.3%) | June 30, 2026 |
| 5 | Toth Financial Advisory Corp | 2.38% | 336K | $7.7M | −32,368 (−8.8%) | June 30, 2026 |
| 6 | Geode Capital Management, LLC | 2.24% | 316K | $7.2M | +20,880 (+7.1%) | June 30, 2026 |
| 7 | State Street Corp | 1.55% | 219K | $5.0M | +1,124 (+0.5%) | June 30, 2026 |
| 8 | Bank of America Corp | 1.26% | 178K | $4.1M | −28,599 (−13.8%) | June 30, 2026 |
| 9 | Mccormack Advisors International | 0.94% | 133K | $3.1M | −64,924 (−32.8%) | June 30, 2026 |
| 10 | Brown Advisory Holdings Inc | 0.77% | 108K | $2.5M | — | June 30, 2026 |
| 11 | Elizabeth Park Capital Advisors, Ltd | 0.75% | 105K | $2.4M | — | June 30, 2026 |
| 12 | Cresset Asset Management, LLC | 0.74% | 104K | $2.4M | −1 (−0.0%) | June 30, 2026 |
| 13 | Renaissance Technologies Corp | 0.73% | 104K | $2.4M | +72,100 (+228.2%) | June 30, 2026 |
| 14 | Northern Trust Corp | 0.71% | 100K | $2.3M | +473 (+0.5%) | June 30, 2026 |
| 15 | Marshall Wace Asset Management Ltd | 0.70% | 98K | $2.2M | +66,618 (+211.7%) | June 30, 2026 |
| 16 | Acadian Asset Management LLC | 0.65% | 92K | $2.1M | +69,193 (+304.6%) | June 30, 2026 |
| 17 | Mackenzie Investments | 0.62% | 88K | $2.0M | +88,203 (0.0%) | June 30, 2026 |
| 18 | Vanguard Portfolio Management, LLC | 0.60% | 85K | $1.9M | +11,632 (+16.0%) | June 30, 2026 |
| 19 | Vanguard Fiduciary Trust Co | 0.59% | 83K | $1.9M | +3,354 (+4.2%) | June 30, 2026 |
| 20 | Sontag Advisory LLC | 0.46% | 64K | $1.5M | +192 (+0.3%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 444K shares and 5 cut 129K.
JMSB top mutual fund and ETF holders
18 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | T. Rowe Price Small-Cap Value | 8.38% | 1.2M | $27.1M | −694 (−0.1%) | August 31, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 2.69% | 379K | $8.7M | — | August 31, 2026 |
| 3 | iShares Russell 2000 ETF | 2.40% | 338K | $7.7M | −3,904 (−1.1%) | September 30, 2026 |
| 4 | Fidelity Small Cap Index | 0.96% | 136K | $3.1M | −167 (−0.1%) | July 31, 2026 |
| 5 | iShares Russell 2000 Value ETF | 0.87% | 123K | $2.8M | +186 (+0.2%) | September 30, 2026 |
| 6 | Vanguard Russell 2000 ETF | 0.51% | 73K | $1.7M | +1,946 (+2.8%) | August 31, 2026 |
| 7 | Fidelity Extended Market Index | 0.41% | 58K | $1.3M | −312 (−0.5%) | August 31, 2026 |
| 8 | iShares Micro-Cap ETF | 0.29% | 40K | $927,198 | −279 (−0.7%) | September 30, 2026 |
| 9 | iShares Core S&P Total US Stock Mkt ETF | 0.23% | 32K | $736,922 | +30 (+0.1%) | September 30, 2026 |
| 10 | Schwab Small Cap Index | 0.21% | 30K | $686,840 | — | August 31, 2026 |
| 11 | iShares Russell 2000 Small-Cap Idx Instl | 0.16% | 22K | $502,540 | — | August 31, 2026 |
| 12 | Fidelity Total Market Index | 0.15% | 22K | $500,342 | — | August 31, 2026 |
| 13 | Stt Strt SPDR® Russell2000 US SmCapETF | 0.14% | 19K | $443,848 | +928 (+5.0%) | August 31, 2026 |
| 14 | Fidelity Series Total Market Index | 0.13% | 19K | $434,070 | — | August 31, 2026 |
| 15 | Nuveen Small Cap Blend Idx R6 | 0.12% | 17K | $400,109 | — | August 31, 2026 |
| 16 | Fidelity Small Cap Value Index | 0.12% | 17K | $399,124 | — | July 31, 2026 |
| 17 | Goldman Sachs Small Cp Val Insghts Instl | 0.10% | 15K | $338,187 | +14,768 (0.0%) | July 31, 2026 |
| 18 | Canada Life US Small-Mid Cap Growth F | 0.10% | 15K | $334,019 | — | July 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
JMSB insider transactions
latest 1| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-07-31 | Kent Carstater | Buy | $18.43 | 5,000 | $92,150 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
JMSB shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns JMSB
Institutional investors own 50.5% of John Marshall Bancorp's shares and insiders 12.47%. The largest holder is T. Rowe Price Investment Management,Inc. with 13.93% of the shares (2.0M), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 5 reduced their stake in the latest filings. Short interest is 3.39% of the float, or 4.29 days of average trading volume. The share count rose 10.3% since 2014.
Related: JMSB analyst forecast, JMSB key metrics, JMSB dividend history. See the JMSB stock overview for the latest quote and news.
JMSB ownership FAQ
Who owns the most John Marshall Bancorp stock?
The largest shareholders of John Marshall Bancorp are T. Rowe Price Investment Management,Inc. (13.93%), BlackRock Inc (6.98%), Vanguard Capital Management, LLC (3.79%), Ayrshire Associates Inc (2.49%), Toth Financial Advisory Corp (2.38%).
What percentage of John Marshall Bancorp is owned by institutions?
Institutions hold 50.5% of John Marshall Bancorp's shares outstanding; insiders hold 12.47%.
Which funds own John Marshall Bancorp?
The largest fund holders of John Marshall Bancorp are T. Rowe Price Small-Cap Value (8.38%), Vanguard MStar Total Stk Mkt Idx Invest (2.69%), iShares Russell 2000 ETF (2.40%), Fidelity Small Cap Index (0.96%), iShares Russell 2000 Value ETF (0.87%).
What is John Marshall Bancorp's short interest?
352K shares of John Marshall Bancorp were sold short, 3.39% of the float; at the average daily volume it would take 4.29 days to cover.
Are insiders buying or selling John Marshall Bancorp?
Of the latest 1 reported insider transactions in John Marshall Bancorp (since July 31, 2025), 1 were purchases and 0 were sales.
How many shares of John Marshall Bancorp are outstanding?
John Marshall Bancorp has 14.1M shares outstanding, of which 12.3M are in the public float.