This sentence is grammatically correct, clear, and professionally written.
However, because 2021 is in the past, you may need to adjust the tense depending on when and how you are using this sentence:
- If you are writing about a past event (Current Day): “The company planned to double its headcount to 1,400 by the end of 2021.” (Or: “The company doubled its headcount to 1,400 by the end of 2021.”)
- If this is from an old document, a case study, or a historical quote: Your original sentence (“plans”) is perfectly fine.
Here are a few ways to rewrite the sentence depending on your desired tone:
More Formal / Corporate:
“The organization intends to expand its workforce to 1,400 employees, effectively doubling its current headcount, by the conclusion of 2021.”
More Concise:
“The company aims to double its workforce to 1,400 by late 2021.”
Press Release / PR Tone:
“Fueled by rapid growth, the company is set to double the size of its team, reaching 1,400 employees by the end of 2021.”
Logical Takeaway:
- Implied Math: By stating the goal is to double the headcount to 1,400, the sentence implies the company’s current headcount at the time of writing is/was 700.
If you need this translated, expanded into a full paragraph, or adjusted for a specific context, just let me know!