Securities Act Registration No. 333-206491
Investment Company Act Registration No. 811-23089

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-1A

Trailmark Series Trust
(Exact Name of Registrant as Specified in Charter)

3000 Auburn Drive, Suite 410
Beachwood, OH 44122
(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, including Area Code: (216) 329-4271

It is proposed that this filing will become effective:

If appropriate, check the following box:

The sole purpose of this filing is to further delay the effectiveness of the Trust’s Post-Effective Amendment to its Registration Statement that was filed on July 15, 2026, accession number 0001398344-26-012177 (Amendment No. 57) to the Trust’s Registration Statement as it relates to the Modern Capital Tactical Income Fund. Parts A, B and C of the Registrant’s Post-Effective Amendment No. 57 under the Securities Act of 1933, as amended and Amendment No. 62 under the Investment Company Act of 1940, as amended, filed on July 15, 2026, are incorporated by reference herein.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this registration statement under Rule 485(b) under the Securities Act of 1933 and has duly caused this registration statement to be signed on its behalf by the undersigned, duly authorized, in the city of Beachwood and State of Ohio, on the 25^th day of September 2026.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following person in the capacities and on the date indicated.

*Attorney-in-Fact - Pursuant to Powers of Attorney, as previously filed on February 28, 2025, and April 29, 2026