TDK Corporation (TTDKY) Institutional Ownership

What the institutions did with TTDKY 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 June 30, 2026.

Managers compared

11

filed both this quarter and last

Managers holding

10

+2 on the quarter

Buyers

7

3 opened new

Sellers

2

1 sold out entirely

Buyer share

77.8%

of managers who traded it

Breadth

+55.6

net buyers, as a share of those trading

Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Largest holders

Manager	Shares	% of reported
Boston Common Asset Management, LLC	208.0K	71.0%
RHUMBLINE ADVISERS	56.0K	19.1%
GAMMA Investing LLC	13.6K	4.7%
Henry James International Management Inc.	11.0K	3.8%
Salomon & Ludwin, LLC	1.9K	0.7%
ATLAS CAPITAL ADVISORS INC.	1.2K	0.4%
PNC FINANCIAL SERVICES GROUP, INC.	380	0.1%
THURSTON, SPRINGER, MILLER, HERD & TITAK, INC.	377	0.1%
Gleason Group, Inc.	239	0.1%
RICHARDSON FINANCIAL SERVICES INC.	45	0.0%

Largest changes

Manager	Action	Previous	Current	Change
Henry James International Management Inc.	New	0	11.0K	+11.0K
Boston Common Asset Management, LLC	Increased	202.4K	208.0K	+5.6K
RHUMBLINE ADVISERS	Increased	53.2K	56.0K	+2.9K
GAMMA Investing LLC	Increased	11.8K	13.6K	+1.8K
ATLAS CAPITAL ADVISORS INC.	New	0	1.2K	+1.2K
Salomon & Ludwin, LLC	Reduced	2.3K	1.9K	-372
Gleason Group, Inc.	New	0	239	+239
Ascentis Independent Advisors	Sold Out	171	0	-171
PNC FINANCIAL SERVICES GROUP, INC.	Increased	362	380	+18

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.