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Institutional ownership intelligence
Schedule 13G/A

FSM Schedule 13G/A filing by Dimensional Fund Advisors

Dimensional Fund Advisors reported beneficial ownership of 18.4M shares, representing 6.2% of FORTUNA MINING CORP. in this filing.

FiledOct 8, 2026
Ownership dateSep 30, 2026
Reported shares18.4M
Reported ownership6.2%
Ownership details

Voting and dispositive power reported in the filing

These figures describe the reporting filer’s disclosed voting and investment authority. They should be read together with the reported share count and percentage.

Sole voting power 18.4M
Shared voting power 0
Sole dispositive power 18.4M
Shared dispositive power 0
Compared with the prior filing

How the reported position changed

This compares the current filing with the previous tracked Schedule 13 filing from the same reporting CIK for FSM. A change between filings does not by itself establish when shares were bought or sold.

Previous filingJan 23, 2025
Reported share change+2,551,258
Ownership percentage change+1 pts
Previous filingThis filing
Reported shares15.9M18.4M
Reported ownership5.2%6.2%
Price context

Price dates alongside the ownership filing

Price data provides market context around the disclosure. It does not identify the filer’s actual transaction price.

Close near filing date$10.61as of Oct 8, 2026
Latest stored close$10.92as of Oct 9, 2026View live quote ↗
Source

Original filing and accession

Use the SEC filing as the primary source when you need the complete disclosure, footnotes, exhibits, or reporting-person details.

Reporting filer
Dimensional Fund Advisors
CIK
CIK0000354204
Accession
0000354204-26-001025
Form
Schedule 13G/A
Read the filing in context

Understand what a Schedule 13 filing does—and does not—tell you.