Company: MITN
Filing Date: 2025-08-15
Form Type: S-3
Source: 0001514281-25-000099
Chunk: 0

Company: AG Mortgage Investment Trust, Inc.
Filing Date: 2025-08-15
Form: S-3
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission on August 15, 2025</div>

#### Registration No. 333-

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

#### FORM S-3

### REGISTRATION STATEMENT

#### UNDER

#### THE SECURITIES ACT OF 1933

#### AG MORTGAGE INVESTMENT TRUST, INC.
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| Maryland                        |     |                             |     | 27-5254382            |
| (State or other jurisdiction of 
 incorporation or organization)  |     |                             |     | -I.R.S. employer      
 identification number |
|                                 |     | 245 Park Avenue, 26th Floor |     |                       |
|                                 |     | New York, New York 10167    |     |                       |
|                                 |     | (212) 692-2000              |     |                       |

<div align='center'>(Address, Including Zip Code, and Telephone Number, including Area Code, of Registrant’s Principal Executive Offices)</div>

#### Jenny B. Neslin

#### General Counsel and Secretary

#### AG Mortgage Investment Trust, Inc.

#### 245 Park Avenue, 26th Floor

#### New York, New York 10167
<div align='center'>(212) 692-2000

(Name, address, including zip code, and telephone number, including area code, of agent for service)</div>

<div align='center'>Copies to:</div>

#### Robert K. Smith, Esq.

#### Kate Saltz, Esq.

#### Hunton Andrews Kurth LLP

#### 2200 Pennsylvania Ave NW

#### Washington, DC 20037
<div align='center'>(202) 955-1500</div>

Approximate date of commencement of proposed sale to public: From time to time after the effective date of this registration statement.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ☒

If this Form is