U.S. President Donald Trump has been on a multimillion-dollar bond-buying spree since taking office in January, investing in debt issued by local authorities, gas districts and major American corporations.

Across 33 pages of filings with the U.S. Office of Government Ethics, or OGE, dated Aug. 12, the president outlined 690 transactions that have taken place since he took office. The documents were made public on Tuesday.

According to CNBC calculations, the purchases had a total value of at least $100 million, assuming the lower value end listed for each disclosed transaction.

By law, the U.S. president, vice president and other select officials must periodically declare "reportable transactions" to the OGE. The precise value of these dealings does not have to be reported.

The extens

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