UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 1-U

CURRENT REPORT

Pursuant to Regulation A of the Securities Act of 1933

July 8, 2026

Date of Report: (Date of earliest event reported)

MASTERWORKS VAULT 4, LLC

(Exact name of issuer as specified in its charter)

1 World Trade Center, 57th Floor

New York, New York 10007

(Full mailing address of principal executive offices)

(203) 518-5172

(Issuer’s telephone number, including area code)

www.masterworks.com

(Issuer’s website)

Series 326 Class A Ordinary Shares, Series 356 Class A Ordinary Shares, Series 361 Class A Ordinary Shares, Series 363 Class A Ordinary Shares, Series 366 Class A Ordinary Shares, Series 367 Class A Ordinary Shares, Series 368 Class A Ordinary Shares, Series 376 Class A Ordinary Shares, Series 380 Class A Ordinary Shares, Series 381 Class A Ordinary Shares, Series 383 Class A Ordinary Shares, Series 385 Class A Ordinary Shares, Series 387 Class A Ordinary Shares, Series 389 Class A Ordinary Shares, Series 391 Class A Ordinary Shares, Series 392 Class A Ordinary Shares, Series 393 Class A Ordinary Shares, Series 395 Class A Ordinary Shares, Series 403 Class A Ordinary Shares, Series 404 Class A Ordinary Shares, Series 405 Class A Ordinary Shares, Series 407 Class A Ordinary Shares, Series 412 Class A Ordinary Shares, Series 416 Class A Ordinary Shares, Series 418 Class A Ordinary Shares, Series 419 Class A Ordinary Shares, Series 422 Class A Ordinary Shares, Series 424 Class A Ordinary Shares, Series 425 Class A Ordinary Shares, Series 426 Class A Ordinary Shares, Series 427 Class A Ordinary Shares, Series 428 Class A Ordinary Shares, Series 433 Class A Ordinary Shares, Series 434 Class A Ordinary Shares, Series 435 Class A Ordinary Shares, Series 437 Class A Ordinary Shares, Series 440 Class A Ordinary Shares, Series 448 Class A Ordinary Shares, Series 450 Class A Ordinary Shares, Series 454 Class A Ordinary Shares, Series 455 Class A Ordinary Shares, Series 457 Class A Ordinary Shares, Series 458 Class A Ordinary Shares, Series 459 Class A Ordinary Shares, Series 460 Class A Ordinary Shares, Series 472 Class A Ordinary Shares, Series 477 Class A Ordinary Shares, Series 480 Class A Ordinary Shares, Series 496 Class A Ordinary Shares, Series 500 Class A Ordinary Shares, Series 502 Class A Ordinary Shares, Series 503 Class A Ordinary Shares, Series 516 Class A Ordinary Shares, Series 517 Class A Ordinary Shares, Series 523 Class A Ordinary Shares, Series 524 Class A Ordinary Shares, Series 527 Class A Ordinary Shares, Series 530 Class A Ordinary Shares, Series 536 Class A Ordinary Shares

(Securities issued pursuant to Regulation A)

Item 1. Fundamental Changes

As previously disclosed by Masterworks Vault 4, LLC (the “Company”) in its Current Report on Form 1-U filed with the SEC on June 25, 2026, Masterworks Gallery, LLC, as agent for its Series 356 (“Series 356”) and the 356 Segregated Portfolio of Masterworks Cayman, SPC sold the artwork created by Cecily Brown (the “Artwork”) for $2,400,000 to an undisclosed buyer (the “Buyer”), pursuant to the terms of a Consignment Agreement (the “Consignment Agreement”). A copy of the Consignment Agreement is incorporated by reference herein, as Exhibit 6.1 hereto, from the Company’s Current Report on Form 1-U as filed with the SEC on June 18, 2026.

On June 26, 2026, the parties consummated the transactions contemplated by the Consignment Agreement and title of the Painting passed to the Buyer. After allocating costs and expenses incurred in connection with the transaction and winding up and amounts in respect of profit sharing interests represented by Class B ordinary shares, record holders of the Company’s Class A ordinary shares will receive a distribution in the amount of approximately $25.09 per Class A share and a net annualized return of 17.8%. “Net annualized return” refers to the annualized internal rate of return, or IRR, net of all fees and costs, to holders of Class A shares from the primary offering, calculated from the final closing date of such offering to the date the sale is consummated. A detailed breakdown of the IRR calculation is attached to this Form 1-U as Exhibit 99.1.

Once Series 356 completes the distribution, the Company will commence the process of winding up and dissolving Series 356 in accordance with its Second Amended and Restated Operating Agreement.

Safe Harbor Statement

This Current Report on Form 1-U contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934. You can identify these forward-looking statements by the use of words such as “outlook,” “believes,” “expects,” “potential,” “continues,” “may,” “will,” “should,” “could,” “seeks,” “projects,” “predicts,” “intends,” “plans,” “estimates,” “anticipates” or the negative version of these words or other comparable words. Such forward-looking statements are subject to various risks and uncertainties, including those described under the section entitled “Risk Factors” in our most recent Offering Circular filed with the Securities and Exchange Commission (“SEC”), as such factors may be updated from time to time in our periodic filings and offering circular supplements filed with the SEC, which are accessible on the SEC’s EDGAR website. Accordingly, there are or will be important factors that could cause actual outcomes or results to differ materially from those indicated in these statements. These factors should not be construed as exhaustive and should be read in conjunction with the other cautionary statements that are included in our filings with the SEC. We undertake no obligation to publicly update or review any forward-looking statement, whether as a result of new information, future developments or otherwise, except as required by law.

Exhibit Index

SIGNATURES

Pursuant to the requirements of Regulation A, the issuer has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: July 8, 2026

ATTACHMENTS / EXHIBITS

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