The 401(k) plan administrator must always issue a Form 1099-R reporting the distribution from the plan that is rolled over (as long as the amount in question is $10 or more). Contact the plan administrator to obtain the missing Form 1099-R.
(The answers suggesting that a Form 1099-R might not be required apply only to IRA-to-IRA trustee-to-trustee transfers, not to rollovers from a 401(k).)
If it was a direct transfer you might not get a 1099-R. Check with your financial institution.
if you made a direct transfer from one plan to the other, you might not get a 1099R. And in that case, you have nothing to report to the IRS so don’t worry about it.
In most cases, a direct transfer does not create a taxable event and does not have to be reported. A direct transfer would only be a taxable event if you went from a pretax plan to a Roth IRA, which would be considered a Roth IRA conversion.
The 401(k) plan administrator must always issue a Form 1099-R reporting the distribution from the plan that is rolled over (as long as the amount in question is $10 or more). Contact the plan administrator to obtain the missing Form 1099-R.
(The answers suggesting that a Form 1099-R might not be required apply only to IRA-to-IRA trustee-to-trustee transfers, not to rollovers from a 401(k).)
It's possible for one 401(k) to be moved to another, say, when one company acquires another and combines the plans into one, an this is done by nonreportable transfer. Such a transfer is not a rollover. Movement of funds between plans of unrelated companies would be a reportable rollover.