Privacy Policy

There are no accounts or sign-ins. The site does not ask for your name, email address, phone number or any other information that identifies you directly.

If you email us, the address and message are used only to reply and are deleted once they are no longer needed.

• Your watchlist, portfolio (share counts and average cost) and its backup copies, the watchlist change log, and your view and theme settings are stored in your browser’s localStorage. The board’s filter and sort are kept in sessionStorage and cleared when the tab closes. None of this is sent to our servers.
• Moving My Sigma data from the old address happens directly between two windows of your browser, or through a backup file you save yourself. It does not pass through our servers.
• You can remove all of it at any time by clearing this site’s data in your browser. It does not sync between devices.
• A watchlist share link contains ticker symbols only.

• sigma-locale remembers the language you chose, for one year.
• Advertising cookies may be set by the ad providers described in section 5.
• You can block cookies in your browser settings; some preferences such as language will then not be remembered.

We use Vercel Web Analytics to see aggregate figures such as page views, referrers, countries and device or browser types. It uses no third-party cookies; visitors are distinguished only by a hash of the request that is discarded after 24 hours, so no individual is identified. We also count how often features are used, such as how many symbols a watchlist holds, but never send ticker names, share counts or amounts to Vercel Web Analytics.

Separately, popular searches count the ticker selected from typed search results. Search text, holdings and investment amounts are not collected. Ten-minute aggregate counts are stored in Upstash Redis for up to 72 hours. To limit repeat counting, the server converts the connection IP address and browser information into a hash that changes daily; only the hash is stored for up to 30 minutes. The raw address and browser information are not sent to Upstash. Your browser also keeps selected tickers and timestamps to suppress repeats for 30 minutes; expired entries are removed on the next search. Selecting a popular ranking does not add to the count.

• This site may show ads served by Google AdSense.
• Third party vendors, including Google, use cookies to serve ads based on a user’s prior visits to this website or other websites.
• Google’s use of advertising cookies enables it and its partners to serve ads to users based on their visit to this site and/or other sites on the Internet.
• You may opt out of personalized advertising by visiting Google Ads Settings, or opt out of a third-party vendor’s use of cookies for personalized advertising at www.aboutads.info.
• How Google uses information from sites that use its services: policies.google.com/technologies/partner-sites
• Ad code is loaded only on successful publisher pages: the board, valid symbol pages, the guide and explanatory articles. It is not loaded on My Sigma tools, the transfer, error pages, About or Privacy.

Our hosting provider, Vercel Inc., may process access records such as IP address, browser information and request time while serving requests. We do not use them to identify individuals.

• Vercel Inc. (United States): hosting and visit statistics, processing access records and aggregate statistics. Privacy policy
• Upstash Inc.: storage of aggregate search counts and short-lived duplicate-prevention hashes. Privacy policy
• Google LLC (United States): ad serving, processing advertising cookies and ad request information. Privacy policy
• Market prices and calendars are fetched by our server directly from external data providers. No visitor information is passed to them.

You can delete the data kept in your browser yourself and turn off personalized ads through the links above. Send any privacy request to the contact below.

Email: centme@naver.com

Changes to this policy are posted on this page with a new effective date.

Effective October 8, 2026.