Swiss-Ski and Swisscom's commercial relationship is to come to an end at the conclusion of the 2021-2022 season, following two decades of partnership.
Telecommunications provider Swisscom is Swiss-Ski's main sponsor.
It assumed the role of general partner in 2002, shortly after Swissair, which had been in that role, grounded all flights and later folded.
Swisscom has been a key commercial partner for Swiss-Ski ever since, but that will end when its current contract expires in April 2022.
"Together we have succeeded in sustainably developing Swiss snow sports on various levels," Swiss-Ski President Urs Lehmann said.
"We look back on extremely successful years - thank you very much for the extraordinary partnership.
"The agreed and expected services have always been provided by both sides since the start of the cooperation in 2002."
Lehmann, who was last week elected to the International Ski Federation (FIS) Council but failed in a Presidential bid, highlighted the commercial strides Swiss-Ski made under his premiership during the FIS campaign.
Since become Swiss-Ski President in 2008, the former downhill world champion has increased turnover from CHF26 million (£20.5 million/$28.8 million/€23.7 million) to an estimated CHF60 million (£47.2 million/$66.6 million/€54.8 million) today.
Swisscom's imprint will be on the Swiss ski team for one more season.
It will also be felt at the Lucerne 2021 Winter Universiade, as it is the official technology partner of the university event.