What are cookies?
Cookies are small text files placed on your device by a website or its service providers. They contain the site domain, a lifetime value, and a unique identifier. Cookies may also record device settings and browsing patterns to support security, remember preferences, and measure performance.
Cookie types by lifespan
Session cookies expire automatically when your browser session ends. These support short-term site functionality such as keeping a multi-step form consistent during a single visit. Persistent cookies remain on your device after the browser is closed and help remember preferences and analytic identifiers across multiple visits within a defined retention window.
Cookie types by origin
First-party cookies are set directly by this website. We use them for language and consent preferences, security tokens, and session continuity. Third-party cookies are set by external service providers for analytics and advertising measurement. Each third party governs its cookies under its own policy, listed below.
Purpose categories
- Authentication — remember login or panel state when applicable and maintain continuity within a single visit. Always active.
- Security — detect malicious activity, prevent harmful use, and provide CSRF protection. Always active.
- Analytics — Google Analytics 4 measures traffic, session flows, and feature usage so we can improve reliability. Activated only after consent; default retention up to 14 months.
- Advertising / Marketing — make ads more relevant, prevent repetitive exposure, and measure conversions across Google and Meta properties. Activated only after consent; retention per provider defaults.
Cookie names and retention
The table below lists common cookies used on this site. Exact names may vary by deployment.
| Name | Purpose | Type | Retention |
|---|---|---|---|
| csrf / _csrf | CSRF protection | First-party | Session |
| session_id | Session management | First-party | Session |
| cookie_consent | Store consent choice | First-party | 12 months |
| _ga | GA4 user identifier | Third-party | 14 months |
| _ga_XXXXXXX | GA4 session state | Third-party | 14 months |
| _gid | GA4 daily session | Third-party | 24 hours |
| _gat | GA4 request throttle | Third-party | 1 minute |
Similar technologies we use
- Web beacons / pixel tags — small 1×1 images or pixel scripts that confirm page loads and conversion events (for example, Google Ads conversion tag, Meta Pixel).
- SDKs — code libraries that function like cookies by collecting device identifiers and behavioral data for analytics and ad measurement.
- Tracking pixels — JavaScript snippets that fire on specific events such as page views or form submissions to measure campaign performance.
Third-party providers
These providers may set cookies or receive event data when enabled by your consent. Refer to their policies for details (written as plain references here):
- Google Analytics 4 — analytics.google.com/analytics/
- Google Ads / Tag Manager — policies.google.com/technologies/ads
- Meta (Facebook / Instagram) Pixel — facebook.com/privacy/policy
- Cloudflare (CDN / security) — cloudflare.com/privacypolicy/
We do not permit any of the above service providers to collect your personal data on this website to use for their own independent purposes.
Managing cookies
You can manage or disable cookies through your browser controls. Popular browsers include Chrome, Firefox, Safari, Edge, and Opera, each providing settings to clear or block cookies. Restricting cookies may affect site functionality such as preference memory.
Use the on-site consent controls to make granular choices by category. To open the preferences panel now, click the “Manage cookie preferences” button above.
Opt-outs (plain references): Google Analytics Opt-out Add-on — tools.google.com/dlpage/gaoptout · Google Ads Settings — adssettings.google.com.
When analytics and marketing cookies activate
Analytics and marketing cookies are inactive until you choose “Accept All” or enable the relevant toggles in the preferences panel. Your choice is stored for 12 months. You may withdraw consent at any time via the footer link “Manage cookie preferences” without affecting the lawfulness of processing before withdrawal.
Updates to this policy
We may update this Cookie Policy to reflect changes in technologies or regulations. Material changes will be highlighted on this page. The effective date appears below.
Contact
Helios Quant Labs Ltd, 12 Baker Street, London, W1U 3BH. Email: [email protected]. For broader information about how we process personal data, your rights, and retention periods, see our Privacy Policy.
Last Updated: March 12, 2026