Characteristics and Risks of Standardized Options or as it is commonly known as the ODD is sent to every account. You might want to keep it handy. You can also get a PDF from the OCC website. It was slotted for an update Q4 of 21. It is a good resource for info like this and is rarely read. One caveat - it's been a long time since I read it - so include myself in the rarely read. https://www.theocc.com/getmedia/a151a9ae-d784-4a15-bdeb-23a029f50b70/riskstoc.pdf;
Sorry, I mistyped. It of course should be: "But since in the Covered Put case the writer has Short Put plus Short Stock then I wonder what transactions are done at assignment, ie. when the Put writer loses." Edit/Update: it looks like you already described this case in your this posting https://www.elitetrader.com/et/threads/naked-put-definition-wrong-at-wikipedia.362439/#post-5479482 I'm still studying it; thx a lot. Sometimes confusing this options stuff
Summary of the definitions: Covered Call (risk is fully covered in advance): Write Call AND Long Stock Covered Put (risk is fully covered in advance): Write Put AND Short Stock Cash Covered Put (risk is fully covered in advance): Write Put AND Enough cash for Strike required Naked Call (risk is not covered in advance, must be paid extra if option loses at end): Write Call (a Long Stock additionally is not required as it then would be Covered Call) Naked Put (risk is not covered in advance, must be paid extra if option loses at end): Write Put (a Short Stock additionally is not required as it then would be Covered Put) PS: "Write" with options means of course "Shorting", ie. ShortSelling .