Company: MITN
Filing Date: 2025-03-21
Form Type: DEFA14A
Source: 0001514281-25-000034
Chunk: 0

Company: AG Mortgage Investment Trust, Inc.
Filing Date: 2025-03-21
Form: DEFA14A
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549
<div align='center'>_____________________________________________________________________</div>

#### SCHEDULE 14A
<div align='center'>(Rule 14a-101)</div>

### INFORMATION REQUIRED IN PROXY STATEMENT

#### SCHEDULE 14A INFORMATION

#### Proxy Statement Pursuant to Section 14(a) of the

#### Securities Exchange Act of 1934
<div align='center'>_____________________________________________________________________</div>

Filed by the registrant x Filed by a party other than the registrant ¨

Check the appropriate box:

| ¨ |     | Preliminary Proxy Statement                                                     |
| ¨ |     | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ¨ |     | Definitive Proxy Statement                                                      |
| x |     | Definitive Additional Materials                                                 |
| ¨ |     | Soliciting Material Pursuant to §240.14a-12                                     |

#### AG Mortgage Investment Trust, Inc.
<div align='center'>(Name of registrant as specified in its charter)

(Name of person(s) filing proxy statement, if other than the registrant)</div>

Payment of filing fee (Check the appropriate box):

| x |     | No fee required |

| ¨ |     | Fee paid previously with preliminary materials.                                                      |
| ¨ |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |