Company: MITN
Filing Date: 2025-08-15
Form Type: S-3
Source: 0001514281-25-000099
Chunk: 2

Company: AG Mortgage Investment Trust, Inc.
Filing Date: 2025-08-15
Form: S-3
Chunk 2
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 Commission is effective. This prospectus is not an offer to sell these securities, and we are not soliciting offers to buy these securities, in any state where the offer or sale is not permitted.

#### SUBJECT TO COMPLETION, DATED AUGUST 15, 2025

#### PROSPECTUS

#### AG Mortgage Investment Trust, Inc.

#### 2,027,676 Shares

#### Common Stock
This prospectus relates to the offer and sale, from time to time, of up to 2,027,676 shares of our common stock, $0.01 par value per share ("common stock"), by the selling stockholders listed in this prospectus (the "selling stockholders"). We will not receive any proceeds from the sale of shares of our common stock covered by this prospectus. We will pay all expenses of the registration of the common stock and certain other expenses.

The registration of the offer and sale of shares of our common stock covered by this prospectus satisfies certain contractual obligations and does not necessarily mean that the selling stockholders identified in this prospectus will offer to sell any of the shares of common stock offered hereby.

The selling stockholders will act independently in making decisions with respect to the timing, manner and size of any sale or non-sale related transfer. The selling stockholders may sell these shares in one or more transactions at the market price for our common stock prevailing at the time of sale, a price related to the prevailing market price, a negotiated price or such other price as the selling stockholders determine from time to time. See "Plan of Distribution." Our common stock is traded on the New York Stock Exchange, or the NYSE, under the symbol “MITT.”

To assist us in qualifying as a real estate investment trust, or REIT, for federal income tax purposes, among other reasons, we impose certain restrictions on the ownership and transfer of our capital stock. See “Description of Common Stock—Restrictions on Ownership and Transfer."

Investing in our securities involves substantial risks. You should carefully read and consider the information under “Risk Factors” on page

#### 5
of this prospectus and any prospectus supplement before making a decision to purchase these securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

#### The date of this prospectus is , 2025.

### TABLE OF CONTENTS

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