Who owns the STACKS trademark?

The STACKS trademark is owned by CALLI LLC.

What is the serial number for STACKS?

The USPTO serial number for STACKS is 99807670.

What is the registration number for STACKS?

STACKS is registered under USPTO registration number 0.

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Updated Oct 25, 2026·18 searches this week

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STA

USPTO Trademark Record

PENDING

STACKS

Q: What class is the STACKS trademark registered in?

The STACKS trademark is registered in Class 041 (Education & entertainment services), Class 042 (Scientific, technology & SaaS services).

SN 99807670·Reg 0·Filed May 06, 2026

Owner CALLI LLC

Education; providing of training; entertainment; sporting and cultural activities.; Scientific and technological services and research and design relating thereto; industrial analysis, industrial research and industrial design services; quality control and authentication services; design and development of computer hardware and software.

STACKS (Serial No. 99807670), Registration No. 0, is a pending US trademark filed on May 06, 2026 by CALLI LLC. This trademark covers Class 041 (Education & entertainment services), Class 042 (Scientific, technology & SaaS services).

Office Action response: March 15, 2027141 days remaining

Mark Intelligence

STACKS (Reg. #0) is a pending US trademark that was filed in 2026 and is currently under USPTO examination. The mark covers Class 041 (Education & entertainment services) and Class 042 (Scientific, technology & SaaS services) respectively. Goods and services include Education; providing of training; entertainment; sporting and cultural activities.; Scientific and technological service....

FILED

May 06, 2026

SERIAL

99807670

REG#

Filing Information

StatusPENDING

Filing DateMay 06, 2026

Serial Number99807670

Registration No.0

Status DateSep 15, 2026

Mark TypeStandard characters

Status DescriptionLive and pending, non-final action mailed

Filing Basis & Declarations

Standard Characters ClaimedFiled as Use ApplicationUse Application Currently

Full Goods & Services

CLASSES

OFFICE

USPTO

COUNTRY

Class 041Education & entertainment services

US codes: 100, 101, 107

First use anywhere: Apr 15, 2026

First use in commerce: Apr 15, 2026

Education; providing of training; entertainment; sporting and cultural activities.

Class 042Scientific, technology & SaaS services

US codes: 100, 101

First use anywhere: Apr 15, 2026

First use in commerce: Apr 15, 2026

Scientific and technological services and research and design relating thereto; industrial analysis, industrial research and industrial design services; quality control and authentication services; design and development of computer hardware and software.

This description is as filed with the USPTO and defines the scope of trademark protection.