UMC United Microelectronics Corporation

NYSE
$20.92

United Microelectronics Corporation (UMC) Institutional Ownership

What the institutions did with UMC last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended September 30, 2026.

Managers compared
3
filed both this quarter and last
Managers holding
3
+0 on the quarter
Buyers
1
0 opened new
Sellers
2
0 sold out entirely
Buyer share
33.3%
of managers who traded it
Breadth
-33.3
net buyers, as a share of those trading

Only 3 managers reported a position this quarter, so the percentages above describe a very small sample.

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Largest holders

Manager Shares % of reported
Ridgewood Investments LLC 31.3K 78.1%
EASTERN BANK 8.5K 21.2%
Versant Capital Management, Inc 305 0.8%

Largest changes

Manager Action Previous Current Change
Ridgewood Investments LLC Reduced 49.2K 31.3K -17.9K
EASTERN BANK Increased 7.7K 8.5K +763
Versant Capital Management, Inc Reduced 321 305 -16

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.