Will They Ever Learn ??

Here's my updated list of companies that have mismanaged funds over the years. Losing coins has happened many times before and will happen again. Many of them were "regulated". Your keys, your Bitcoins. Not your keys, not your Bitcoins.

1. 2011 - Bitcoin7
   
2. 2012 - BitFloor
3. 2012 - Bitcoinica
4. 2013 - BTER
5. 2013 - BitCash
6. 2013 - Bitcoin-24
7. 2013 - Mt.Gox
8. 2013 - Vicurex
9. 2014 - Bitcurex
10. 2014 - Cryptsy
11. 2014 - KipCoin
12. 2014 - MintPal
13. 2014 - Mt.Gox
14. 2014 - Poloniex
15. 2015 - 796
16. 2015 - ShapeShift
17. 2016 - Binance
18. 2016 - Bitfinex
19. 2016 - GateCoin
20. 2017 - Bithumb
21. 2017 - Yapizon
22. 2017 - Youbit
23. 2018 - Bancor
24. 2018 - Binance
25. 2018 - Bitgrail
26. 2018 - Bithumb
27. 2018 - CoinSecure
28. 2018 - Coinbin
29. 2018 - Coincheck
30. 2018 - Coinrail
31. 2018 - MapleChange
32. 2018 - QuadrigaCX
33. 2018 - Taylor
34. 2018 - Zaif
35. 2019 - BITpoint
    
36. 2019 - Binance
37. 2019 - Bithumb
38. 2019 - Bitrue
39. 2019 - Bitstamp
40. 2019 - CoinBene
41. 2019 - Coinmama
42. 2019 - Cryptopia
43. 2019 - DragonEx
44. 2019 - LocalBitcoins
45. 2019 - Upbit
46. 2019 - VinDAX
47. 2020 - Altsbit
48. 2020 - Atomars
49. 2020 - DragonEx
50. 2020 - KuCoin
51. 2021 - BlockFi
52. 2021 - Coinseed
53. 2021 - Hotbit
54. 2021 - Thodex
55. 2022 - 3AC
56. 2022 - Alamada Research
57. 2022 - Binance
58. 2022 - BlockFi
59. 2022 - Celcius
60. 2022 - Deribit
61. 2022 - FTX
62. 2022 - Freeway
63. 2022 - Ikigai
64. 2022 - Voyager
65. 2022 - West Realm Shires Services

If you want me to add a company to the list, leave it in the comments with some info..

EDIT: I added years to the list on the recommendation of /u/ducasaurus
You can see that some exchanges like Binance have multiple entries because they were involved in multiple incidents.
Companies make the list for hacks, freezing of users funds, insolvency, or anything like that.