Deribit as a venue: reserves, socialized losses and liquidation of long options
Data as of 23.09.2026 unless another date is given next to a figure.
Verdict: usable, with limits. The exchange is regulated (VARA licence), owned by Coinbase, and in eleven years has never pushed a loss onto clients. But from 1 September 2026 it stopped publishing daily proof of reserves, and its rules allow it to claw back part of the day's profit from everyone in the green if the insurance fund runs dry. So Deribit works as a place for positions and the margin behind them, not as a place to park money. A less obvious point from the margin docs: on portfolio margin even long options can be liquidated, because the cash balance there can go negative; on standard margin they cannot.
What it is
The world's largest crypto options exchange (BTC, ETH, SOL and others). Operator: Deribit FZE, licensed by the virtual-asset regulator VARA. Owned by Coinbase since August 2025.
Findings
1. Public proof of reserves is gone, and the custody documents contradict each other
On 27.08.2026 Deribit announced that from 1 September 2026 it would retire its Proof of Reserves page, and that roughly 90% of client assets had already been migrated to Coinbase custody. In place of the daily page: an annual external reserves audit and reporting on request. Which Coinbase entity actually holds the assets is not named (CryptoSlate, 29.08.2026).
Meanwhile the Custody Policy still live in the help centre (updated 25.08.2025) describes a different setup: 1–2% in a hot wallet, up to ~30% warm (Fireblocks), the rest in cold storage with keys in bank vaults. One of the two pictures is stale, and nobody has said publicly which one.
Shares are taken from Deribit's own documents, not measured. Both documents are live on the exchange's site as of 23.09.2026.
Sources: Deribit Insights, 27.08.2026 · CryptoSlate, 29.08.2026 · Custody Policy, updated 25.08.2025.
2. Socialized losses are written into the rules and cannot be disputed
Exchange Rulebook (version 2.0, effective 13.08.2026), rule 10.9: if the insurance fund is exhausted, Deribit may deduct a pro-rata amount from every member with positive P&L in the same day's session, and may also halt trading, cancel orders and close anyone's positions at the mark price. Rule 10.10 bars members from disputing the obligation; the rulebook calls the mechanism "a fundamental, non-negotiable feature of the Exchange". The only protection against counterparty default is the insurance fund — there is no separate clearing house (Custody Policy §1.3).
Source: Deribit Exchange Rulebook, updated 15.09.2026, rules 10.1, 10.6–10.11.
3. Track record: no socialized loss ever, and three times the company paid out of pocket
According to the help centre (14.08.2026), Deribit has never had a socialized loss event. Three occasions when the company, not clients, ate the loss:
| Date | Event | Who paid |
|---|---|---|
| 31.10.2019 | a BTC index glitch triggered false liquidations | the company returned 150+ BTC (~$1.3m) from its own reserves; insurance fund untouched |
| 12–13.03.2020 | BTC −40% in a day; insurance fund fell from ~392 to ~198 BTC | the company injected 500 BTC to avoid socialization |
| 01.11.2022 | $28m hot-wallet hack; withdrawals paused | covered from the company's balance sheet, separately from the insurance fund (then ~$40m) |
Sources: Insurance Fund, 14.08.2026 · Finance Magnates, 2019 · Deribit Insights, March 2020 · CoinDesk, 02.11.2022.
Caveat: every time, it was the founders' balance sheet that stepped in. The exchange has changed hands since, and nowhere is it publicly committed that Coinbase would do the same.
4. Regulator and owner
The VARA licence has been in force since 01.11.2024; the public register shows it as "Active". It covers exchange services for derivatives and broker-dealer services for institutional, qualified and retail investors; no enforcement actions in the register. The licence number appears in two forms: L-2994 in the rulebook, VL/23/12/002 in the VARA register — most likely two numbering schemes for one document, but unverified. Coinbase closed the acquisition in August 2025 for ~$2.9bn ($700m cash + 11m shares).
Sources: VARA register, checked 23.09.2026 · The Block, 2025 · CNBC, 08.05.2025.
Can the exchange force-close a book of long options only?
Yes, if the account is on portfolio margin. The Portfolio Margin docs (updated 14.09.2026) warn explicitly that a portfolio made up solely of long options can be liquidated, because the margin model lets a small amount of leverage creep in even when only buying options. Standard margin is the opposite: "Options bought on Standard Margin can not be liquidated" (Liquidations, updated 17.10.2025).
How maintenance margin works on portfolio margin (per-currency mode)
Each settlement currency is margined separately. The book is run through scenarios: a price move across a range, e.g. ±16% in 9 steps; three volatility states; an extended table of large moves. Position initial margin is the worst case of the risk matrix plus delta and roll shocks; maintenance margin is 80% of initial (default factor 0.80). Net delta on long options is ignored unless it offsets delta from futures and short options.
Is a long option's risk capped at its value? The docs don't say so directly. Working from the formulas: a long option can't go below zero, so the worst scenario can't exceed its value, and the delta add-on for a book with no futures or short options is zero. Hence maintenance margin on such a book is at most 80% of the options' value.
So where does liquidation come from? The leverage sits in the balance, not the margin: on portfolio margin you don't have to pay the full premium, and the cash balance in a currency can go negative. An older Deribit Insights piece (2020, updated 21.08.2024) describes exactly this: the margin system may not tie up the whole premium, which builds leverage into the position — and with leverage comes liquidation risk.
When the risk applies: for an account holding only long options — if the cash balance in every currency is non-negative, equity is at least the options' value and the liquidation threshold is out of reach by construction. If any currency is negative, the risk is real. This is derived from the formulas, not quoted.
What gets closed first when margin runs short
Liquidation kicks in once maintenance margin exceeds 100% of the margin balance. On portfolio margin the engine looks for the instrument contributing most to the requirement and liquidates it; if the order doesn't fill, it moves to the next one, and after that it may delta-hedge with perps or futures — including opening entirely new positions. It runs in one-second rounds and stops as soon as margin is back below equity. There is no prior margin call, the client has no control while it runs, and any hedges the exchange opened stay with the client afterwards (Liquidations, section "S:PM", updated 17.10.2025).
Bottom line: in a long-options-only book the option with the largest margin contribution goes first, then the next, and then the exchange may open a futures hedge the book never had. Rule 10.1 additionally allows the exchange to close out a member's entire account.
What would break it, and by how much
| Event | What is lost | How plausible |
|---|---|---|
| FTX-style collapse of the exchange or custodian | everything on the exchange; a place in the creditor queue | low: Coinbase + VARA + 11 years without socialized losses. But no daily proof of reserves since 01.09.2026, and the custodial entity is unnamed |
| Socialized losses after a crash that drains the insurance fund | a pro-rata slice of that session's profit; no right to dispute | low: zero events in its history. The fund came close twice, and both times the company bailed it out |
| Forced close of a long-options book on portfolio margin | options sold at a bad moment plus the liquidation fee; possibly exchange-opened futures | only if a currency's cash balance is negative; never on standard margin |
| The exchange changes margin model parameters | margin requirement rises with no market move | rule 9: changes allowed, notice given "to the extent… reasonably possible" |
What we don't know
No instrument for it. Which Coinbase entity holds ~90% of client assets, and whether they are ring-fenced from that entity's bankruptcy — obtainable by request from Deribit, which promises to share reserve-audit documents on request. The current insurance fund size from a primary source is also unconfirmed: Deribit itself cited $101m in March 2024; third-party 2026 reviews quote $100–174m with no primary source, so those figures are discarded.
Nobody knows. Whether the fund would cover a March-2020-scale crash at today's open interest, and whether Coinbase would plug the hole from its own balance sheet the way the founders did.
Rating and what revokes it
Rating: usable, with limits. Who it suits: active traders keeping on the exchange the capital that backs open positions and their margin. It doesn't suit as a store of idle cash: an exchange is a place to trade, not a vault. For option buyers, standard margin — or portfolio margin with no negative cash balance in any currency — keeps a long option's risk capped at its value.
Any one of these revokes it: a socialized loss event · withdrawals halted for more than 24 hours outside announced maintenance · VARA suspends or revokes the licence · Coinbase sells or shuts Deribit · no external reserves audit published or provided on request by 01.09.2027.
What to check, and when
Date trigger — 01.09.2027: the annual reserves audit. The events above revoke the rating immediately, without waiting for the date.
Testable forecasts:
- No socialized loss event on Deribit before 31.03.2027.
- By 01.09.2027 Deribit publishes, or provides on request, the result of an external reserves audit. If not, the rating is withdrawn.
Research for information only. Not investment advice.