index.js

const fs = require("fs");
var Web3 = require('web3');

//bee ABI copy and pasted from etherscan
var ABI = fs.readFileSync('./beeTokenAbi.json', 'utf8')
// use your infura token please
var web3 = new Web3(new Web3.providers.HttpProvider("https://mainnet.infura.io/YOURINFURALINK"))

//creates contract instance at address
let beeContract = new web3.eth.Contract(JSON.parse(ABI),"0x4D8fc1453a0F359e99c9675954e656D80d996FbF")

var ABI = fs.readFileSync('./beeABI.json')
let beeTokenOfferingContract = new web3.eth.Contract(JSON.parse(ABI), "0x62caf75a67252f7be236a7335fed1410c7434b7f")

var ICOTokenHolders = {}
var tokenHoldersList;

console.log("starting ICO TOKEN HOLDER SEARCH");

// get past events from token offering contract -> event = TokenPurchase
beeTokenOfferingContract.getPastEvents('TokenPurchase',
{fromBlock:5007452, toBlock:5019086}).then(function(events) {
  // store number of past events
  var eventsCount = events.length;

  // for loop through each event and put purchaser address in dictionary along with 0 value
  for (var i = 0; i < eventsCount; i++) {
    var purchaser = events[i].returnValues[0];
    ICOTokenHolders[purchaser] = 0;
  }

  console.log("finished FINDING ICO TOKEN HOLDERS")
  //return ICOTokenHolders;
  return ICOTokenHolders;
}).then(function(ICOTokenHolders) {
  console.log("starting TOKEN TRANSFERS SEARCH");

  // Get an array of token holder addresses for event filter and print
  tokenHoldersList = Object.keys(ICOTokenHolders);

  //get past events from BeeToken Contract -> event = Transfer
  beeContract.getPastEvents('Transfer', {fromBlock:5019086}).then(function (events) {
      // store number of past events
      var eventsCount = events.length;

      /* for loop through each event and
      * if seller is in tokenHoldersList -> subtract value in dictionary
      * if buyer is in tokenHoldersList -> add value in dictionary
      */
        for (var i = 0; i < eventsCount; i++) {
          var seller = events[i].returnValues[0];
          var buyer = events[i].returnValues[1]
          var tokenAmount = Number(events[i].returnValues[2])/1000000000000000000;
          var currTokens;
          if(seller in ICOTokenHolders) {
            currTokens = ICOTokenHolders[seller];
            ICOTokenHolders[seller] = currTokens - tokenAmount;
          }
          if(buyer in ICOTokenHolders) {
            currTokens = ICOTokenHolders[buyer];
            ICOTokenHolders[buyer] = currTokens + tokenAmount;
          }
        }
        console.log("finished FINDING TOKEN TRANSFERS")
        return ICOTokenHolders;
    }).then(function(ICOTokenHolders) {
      console.log("Printing TOKEN HOLDERS WHO BOUGHT MORE TOKENS POST ICO")
      for(key in ICOTokenHolders) {
        if(ICOTokenHolders[key] >0.001) {
          console.log("TokenHolder " + key + " bought " + ICOTokenHolders[key] + " BeeTokens after the ICO");
        }
      }

    });
});