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The 13-F is the quarterly SEC filing that forces large institutional managers to disclose their equity positions as of a specific date.
There is a lag between when those holdings are recorded and when the filing becomes public, and every number in the document reflects that gap.
Friday's filing from Berkshire Hathaway showed the conglomerate held approximately 106 million shares of Alphabet, the parent company of Google, valued at $37.9 billion at the end of June.
By that measure, Alphabet now ranks among Berkshire's three largest equity holdings. A top-three position in a portfolio of Berkshire's scale represents a meaningful concentration.
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