Jane Street Group, LLC Increases Stake in TSS, Inc. (TSSI) to 5.2%

On June 1, 2026, Jane Street Group, LLC filed a Schedule 13G indicating a significant increase in its holdings of TSS, Inc. (TSSI). As of the event date on May 26, 2026, Jane Street Group, LLC, along with its subsidiaries Jane Street Capital, LLC and Jane Street Global Trading, LLC, reported beneficial ownership of 1,466,261 shares of Common Stock. This represents a 5.2% ownership stake in the company, crossing the 5% regulatory threshold. The filing reveals a substantial growth from previous holdings of 658,081 shares, effectively more than doubling their position. The total value of the current position is estimated at approximately $24.16 million based on the filing data. Jane Street Group, LLC maintains shared voting and dispositive power over the entirety of the reported shares. The filing was made under Rule 13d-1(c), certifying that the shares were acquired for investment purposes and not with the intent to influence or change the control of the issuer.