Cross over Ownership

What researching both sides finds that one side cannot

Most ownership data is built from Form 13F, and a 13F only ever shows one thing: US listed, long, US custodied common stock, reported by investment managers. Read it alone and an entire class of ownership is invisible. A company can hold billions of dollars of another company in a form that no 13F will ever carry, and its own annual report can decline to name the investee at all, folding the stake into a single combined line with dozens of others.

Because every company here is researched in both directions, those stakes can be recovered from the other end. A company must disclose who owns large blocks of itself, by name, in its own filings. So the investee names the investor even when the investor never names the investee.

The worked example is NVIDIA and Lumentum.On 2 March 2026 NVIDIA paid $2.0 billion for roughly 2.9 million shares of Lumentum Series A Convertible Preferred Stock. Nothing in the conventional record shows it. It is preferred stock, not the listed common class, so it is not 13F-reportable and NVIDIA’s Form 13F carries no Lumentum line at all. NVIDIA’s own quarterly report, filed after the purchase, never mentions Lumentum: the money sits inside a combined non-marketable securities balance with $17,899 million of additions that quarter and no breakdown. The stake is named in exactly one place, and it is not the buyer’s paperwork. It is Lumentum’s own annual report, where the issuer identifies its holder.

That is why this site orders its sources with an issuer’s own filing above a 13D or 13G, above a Section 16 form, above a 13F. The counterparty is often the better witness. The same reasoning recovers warrants, convertible notes, private placements and stakes in companies that never listed, none of which a manager-reported dataset contains.