Slack's name is usually told as a cute acronym story. The more useful story is in the paperwork. On May 1, 2013, a small San Francisco company called Tiny Speck asked the USPTO to register SLACK — for software it hadn't released yet, from a company that wasn't called Slack.
The Record
| Reg. No. | Mark | Filed / registered | Class | Owners on record |
|---|---|---|---|---|
| 4,610,670 | SLACK | May 1, 2013 / Sept. 23, 2014 | 42 (software services) | Tiny Speck, Inc. → Slack Technologies, Inc. → Salesforce, Inc. |
| 4,877,559 | SLACK | May 22, 2015 / Dec. 29, 2015 | 9 (downloadable software) | Slack Technologies, Inc. → Salesforce, Inc. |
Both registrations were live and renewed at the end of September 2026, according to the USPTO's records.
- May 1, 2013 — Filed by Tiny Speck, Inc. on an intent-to-use basis: the company didn't have to be selling under the name yet.
- March 11, 2014 — Approved for publication. No Office Action appears in the file.
- April 22, 2014 — Published for opposition. Nobody opposed.
- June 17, 2014 — Notice of Allowance.
- July 9, 2014 — Statement of use filed: proof the name was now in use.
- September 23, 2014 — Registered as No. 4,610,670.
From a Game Studio to Slack Technologies
The company's own IPO prospectus tells the corporate side in three sentences: it was incorporated in Delaware in 2009 as Tiny Spec, Inc., renamed itself Tiny Speck, Inc. later that year, and became Slack Technologies, Inc. in 2014. Tiny Speck's product was an online game, Glitch, which it closed in 2012. The chat tool the team had built for itself while making the game was what survived.
Slack opened to the public as a preview in August 2013 and, in the prospectus's words, "We launched Slack publicly in 2014." By the time of that filing in April 2019, the company reported more than 10 million daily active users and more than 88,000 paid customers, and listed Slack as its registered trademark in the U.S. and nine other jurisdictions.
Put the dates side by side and the trademark filing comes first. Tiny Speck asked for SLACK in May 2013, three months before the public preview and about a year before the company itself took the name.
The Name
The word is the brand's real asset: a short, everyday English word that says nothing about what the software does. For workplace messaging software, "slack" is arbitrary — and arbitrary words are among the strongest kinds of trademarks, because no competitor needs them to describe its own product. That may be part of why the first application went through without a single Office Action.
As for the acronym: Butterfield has been reported as explaining SLACK as "Searchable Log of All Conversation and Knowledge," and as picking the name in 2012 to replace an earlier codename. Published accounts disagree on whether the phrase came first or was fitted to the word afterwards, and we found no primary interview that settles it. The trademark record doesn't care either way — the USPTO registered the word, not the phrase.
Salesforce
Salesforce announced on July 21, 2021 that it had completed its acquisition of Slack Technologies, a deal reported at about $27.7 billion. The trademark record followed: both SLACK registrations now list Salesforce, Inc. as owner. Salesforce said Slack would keep operating under its own brand.
What This Record Teaches
- File before the preview, not after. Tiny Speck's intent-to-use application gave it a priority date months before strangers saw the product. An intent-to-use filing lets you claim the name before launch; you prove use later, as Tiny Speck did in July 2014.
- The product name doesn't have to match the company — but the chain of title has to be clean. The applicant was Tiny Speck; the brand became Slack; the owner today is Salesforce. Each change is recorded against the registration. When a startup renames itself or gets acquired, recording the assignment is what keeps the registration usable.
- An arbitrary word is easier to register. "Slack" says nothing about messaging software. In our analysis of USPTO data, about 62% of single-class software-services applications (Class 42) filed in early 2025 drew at least one Office Action; this one drew none.
Frequently Asked Questions
What does Slack stand for?
Founder Stewart Butterfield has been reported as explaining it as "Searchable Log of All Conversation and Knowledge." Accounts differ on whether the phrase or the word came first. The registered trademark is the word SLACK.
Who filed the Slack trademark?
Tiny Speck, Inc., the game company that built Slack, filed the first SLACK application on May 1, 2013 (registered in 2014 as No. 4,610,670). The registrations later passed to Slack Technologies and, after the 2021 acquisition, to Salesforce, Inc.
When did Slack launch?
Slack opened as a public preview in August 2013. The company's 2019 IPO prospectus says it launched Slack publicly in 2014.