Bittrex released SegWit2x related statement

The BTC ticker will remain behind the Bitcoin Core chain at least until the hardfork
07 November 2017   1991

The Bittrex exchange has decided on its position on the SegWit2x hardfork, saying that it will keep the BTC ticker for the current version of bitcoin at least until this event, but may later reconsider its position.

The Bittrex statement says that the exchange did not sign the New York agreement and remains neutral with any fork, including SegWit2x.

Bitcoin Segwit2x is considered a "contentious" hard fork which has divided the Bitcoin community and may result in a chain split. There is also no replay protection present so Bittrex must undertake extra measures to ensure that in a chain split, user coins are preserved on both chains. There may be delays in Bitcoin deposits and withdrawals for some time due to these extra measures.
 

Julian Yap

Bittrex

 In this regard, the exchange notes, there may be delays in accepting deposits and withdrawing Bitcoin funds.

The BTC ticker will remain behind the Bitcoin Core chain at least until the hardfork, after which the exchange will assess the situation within 24-48 hours to determine if the chain has been split.

In the event of a chain split, "BTC" will remain the existing Bitcoin chain with 1 MB blocks until the industry and ecosystem demonstrates a clear chain preference for Bitcoin. Bittrex will take all reasonable steps to ensure that customer funds can be preserved on both chains. Bittrex will make all reasonable attempts to credit our users chain split tokens. We will not recover incorrectly made cross chain deposits under any circumstance due to the lack of replay protection.
 

Julian Yap

Bittrex

 At the same time, Bittrex will take all necessary steps to ensure that users' funds are stored in both coins. However, due to the lack of a mechanism for protecting against the replaying of transactions, the return of funds in case of sending coins to an incorrect chain will not be carried out.

In the event that if it not be clear which chain is preferred and which one will be dominant, Bittrex does not exclude the opening of B2X token trading (Segwit2x chain with 2Mb blocks). It is also likely to extend the evaluation period.

The exchange promises to charge new tokens in the ratio 1: 1 at the time of the hardfork at block 494,784. However, the input and output of funds will be stopped approximately 24 hours before this event on block 494,640. In the event that until this moment the sent transaction has not been confirmed, new tokens will not be accrued. At the same time, trading on the platform at the time of the hardfork will not stop.

Bittrex to Go For Maintenance After 1/3 Funds Moved

Users suspects hack, but exchange says "funds are safe"
05 December 2019   455

The Bittrex cryptocurrency exchange has announced scheduled maintenance today, December 5, from 22:00 to 23:00 (GMT). On the eve, a third of its assets were transferred to an unknown wallet.

During maintenance, users will not be able to log into the system or use the APIs. Trading will be suspended.

On December the 4th, populat Twitter account posted that "43,564 #BTC (313,074,134 USD) transferred from Bittrex to unknown wallet." Users suspected that the exchange was hacked, but the exchange . 

Closures for scheduled maintenance only heightened suspicion. However, the Bittrex team assures that "that claim is false."