What IEO is you can read here: https://www.coinstaker.com/initial-exchange-offering-ieo/; https://www.initialcoinlist.com/what-is-an-initial-exchange-offering-ieo/.

Today many people say that IEO is an “evolution of ICO” and predict a great future for it (see: https://bitcointalk.org/index.php?topic=5119748.0;all).

At the same time I couldn’t find a list of platforms organizing IEO today, so I decided to compile it myself and post it on BTT.

NB: check this list before you participate in IEO - https://www.blockchaintransparency.org/trading-advisory-list.

List of platforms and last project's profit margin (actual at 16.04):
1. Binance Launchpad (https://launchpad.binance.com/). Ended: Celer (x2.58). Upcoming: Matic.
2. Bittrex (https://international.bittrex.com/). Ended: Veriblock (x0.64).
3. Idax (https://www.idax.pro/#/foundation/index). Ended: GobPLatform (not listed). Ongoing: Pko, AliensCoin.
4. Exmarkets (https://exmarkets.com/launchpad). Ended: Decimated (x1.55), CoinAnalyst (not listed). Ongoing: AgroExchange, Menapay, Venusenergy, Terragreen.
5. Probit (https://www.probit.com/en-us/ieo). Ended: Wegen (x0.4), Verasity (x0.08), Linix Coic Redi and much more (not listed). Ongoing: Nuvo, Membrana.
6. Latoken (https://latoken.com/). Ended: can't find in the website (x0.01 i guess). Ongoing: more than 30.
7. Coineal (https://www.coineal.com/ieo.html#en_US). Ended: Zerobank (x0.63), Levolution (x0.03), KGT TOOL IPWT and more not listed). Ongoing: HINT, XCON, GTEX.
8. Below you will see the list of platforms, on which MenaPay, one of the projects I’ve translated (https://bitcointalk.org/index.php?topic=5055912.new#new), is holding it’s IEO. I don’t know anything about these platforms so please reply here if you have anything to share about them. Also I’m not quite sure that these platforms are fully IEO platforms, not just a place for selling tokens:
- https://sistemkoin.com
- https://chainex.io/
- https://www.icrypex.com/
- https://www.coinegg.com/
- https://www.finexbox.com/
- https://www.klascoin.com/
- https://abcc.com
- https://www.dcoin.com/
- https://60.com
9. One of BTT users offers his services in organizing IEO and he points to a rather large list of exchanges conducting IEO (https://bitcointalk.org/index.php?topic=5120875.0;all): I couldn’t find any confirmations regarding these exchanges.
10. EOSex (https://eosex.com/).
11. ZB, ZBG (https://www.zbg.com/launchpadList). Ended: GTS (x5.3), VSYS (it was not a real IEO). Upcoming: BITW.
12. BW (https://www.bw.com/TLP). Grabity Link Blockbuster (not listed). Ongoing: Pantheon X.
13. EXMO (https://exmo.com/ru/articles/ieo). Ended: Paytomat (x0.8).
14. CoinBene - IEO was cancelled (https://ambcrypto.com/coineal-chosen-as-coinbenes-replacement-for-facilitating-ieo-amidst-reports-of-suspicious-activity/).
15. Cobinhood (https://cobinhood.com/token-offering). Ended: Dexon (not listed), simplyBrand (x0.67). Ongoing: Gemstra.
16. BGOGO (https://bgogohelp.zendesk.com/hc/en-us/articles/360026697851-Bgogo-Apollo-Launchpad-Announcement-on-upcoming-projects). Ended: ARM. (x0.64) Upcoming: Facepower.
17. KuCoin Spotlight (https://www.kucoin.com/news/en-introducing-kucoin-spotlight). Ended: MultiVAC (x1.6).
18. Huobi Prime (https://huobiglobal.zendesk.com/hc/en-us/articles/360000225182-Prime-Trading-Guide). Ended: TOP (x6.5). Upcoming: Newton.
19. Okex (https://cryptonews.com/news/okex-announced-its-first-token-sale-via-ieo-3647.htm). Ended: Blockcloud (x8.0).
20. Hotbit Polaris (https://help.hotbit.io/hc/en-us/articles/360021169193-The-Purchase-Application-of-Lichang-LC-Will-Be-Opened-by-April-7th-2019-on-Hotbit-Polaris). Ended: Lichang (x2.5).
21. LBank (https://medium.com/oathprotocol/oath-protocol-announces-token-sale-first-ieo-on-lbank-exchange-cff42eb4d055). Ended: Oath (x2.7).
22. TRXMarket (https://support.trx.market/hc/en-us/articles/360026340172-TRXMarket-Will-Launch-First-Project-TRONAce-through-LaunchBase-). Ongoing: TRONAce.
23. BitMart (https://support.bitmart.com/hc/en-us/articles/360021198394-BitMart-Will-Start-the-Private-Sale-of-Bicoin-Token-BCT-). Ended: Bicoin token (not listed).
24. Saturn (https://blog.saturn.network/steps-to-launch-your-decentralized-initial-exchange-offering-ieo/).
25. Coinsuper (https://support.coinsuper.com/hc/en-gb/articles/360021643393-CS-Hub-will-Launch-Atlas-on-April-22-2019).


Upcoming platforms:
1. Ataix (https://ataix.com/ieo).
2. gate.io - https://cryptor.net/news/birzhi-kriptovalyut-gateio-i-bibox-zayavili-plany-na-otkrytie-servisov-ieo-3433
3. Bibox - https://bibox.zendesk.com/hc/en-us/articles/360021316973--Announcement-On-The-Rules-of-The-First-Phase-of-Bibox-Orbit-Comments-Collection
4. Drive - https://bitcoinexchangeguide.com/drive-market-crypto-exchange-plans-for-ieo-native-token-sale-and-listing-as-a-service-launch/

The list will be updated. Waiting for your corrections, comments and additions.
Updated 16.04.2019.