Lump Sum Investing vs. Dollar Cost Averaging (as a Long Term Investor)
I think you're not applying the right time scale here. ESPP (Employee Stock Purchase Plan) is usually vesting every 6 months. So every half a year you receive a chunk of stocks based on your salary deduction, with the 15% discount. Every half a year you have a chunk of money from the sale of these stocks that you're going to put into your long term investment portfolio. That is dollar cost averaging. You're investing periodically (every 6 months in this case), same (based on your salary deferral) amount of money, regardless of the stock market behavior. That is precisely what dollar cost averaging is.
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Lump Sum Investing vs. Dollar Cost Averaging (as a Long Term Investor)

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I think you're not applying the right time scale here. ESPP (Employee Stock Purchase Plan) is usually vesting every 6 months. So every half a year you receive a chunk of stocks based on your salary deduction, with the 15% discount. Every half a year you have a chunk of money from the sale of these stocks that you're going to put into your long term investment portfolio. That is dollar cost averaging. You're investing periodically (every 6 months in this case), same (based on your salary deferral) amount of money, regardless of the stock market behavior. That is precisely what dollar cost averaging is.