Prospectus Certification by Investment Company (Form 497J)

October 9, 2026

VIA EDGAR

U.S. Securities and Exchange Commission
100 F. Street, N.E.
Washington, DC 20549

Attention: File Room

Dear Sir/Madam:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, please accept this letter as certification that the forms of Prospectus and Statement of Additional Information relating to the Registrant's WisdomTree Efficient Long/Short U.S. SmallCap Equity Fund, each dated October 5, 2026, that would have been filed pursuant to Rule 497(c) would not have differed from that contained in Post-Effective Amendment No. 1007 (the "Amendment") to the Registrant's Registration Statement on Form N-1A. The Amendment was filed electronically on October 5, 2026 (Accession No. 0001214659-26-012559).

Any comments or questions with respect to this filing should be directed to my attention at (917) 267-3855.

Very truly yours,

/s/ Joanne Antico

Joanne Antico

Chief Legal Officer and Secretary

WisdomTree Asset Management, Inc. 250 West 34^th Street, New York, NY 10119 | 212-801-2080 Tel 212-801-2081 Fax