Brief Modeling Question - Stub Periods

Trying to practice building basic operating models/DCFs in preparation for interviews. If you have a few years of historical financial information, along with a stub period for the current year, how would you structure the timing of your projections?

For example, if I had full year data for 2018, 2019, 2020, and then data for the first quarter of 2021, should my first projection be for the last 9 months of 2021, and then begin yearly projections with 2022? What would be the best way to incorporate the available stub period into the stub projection?

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Disagree w/ the above post since you don't actually have monthly data for 1Q21, so allocating WC and cash on a monthly basis is inherently going to be inaccurate since it's just a straight up guess (GDP not a proxy to break out cash and WC timing) and more importantly, there's no reason to do it.  Additionally, if you're an M&A guy, you'll never be asked to model on a monthly basis (even in RX, we only do that on an LE when we have monthly data from the company) and probably not even on a quarterly basis. 

Hypothetically, if this is a public company w/ research coverage, you would plug in Q1 actuals into a 3/31 LTM column, then have a 9 months ended column that is annual consensus Revenue / EBITDA, less 1Q actuals (can build individual line items based on historical margin, etc.).  

Ideally, you would like to be able to pull 1Q20 information so that you can have a 3/31 LTM column.  This is best way to incorporate the stub period.  Your thinking is correct on projections beginning w/ 9 months ended period, then next projection period being annual 2022. 

So historicals are the annuals that you have data for & 3/31 LTM.  Projections are 9 months ended 12/31/21 (annual consensus, less 1q21), FY 2021, 2022-end of projection period on an annual basis.   

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