Ownership blocker
Also called: beneficial ownership limitation, blocker, 4.99% blocker, 9.99% blocker, conversion cap
A clause that stops a holder from converting or exercising a security if doing so would push its beneficial ownership above a set limit, typically 4.99% or 9.99% of the common stock.
Last verified
How it works
Warrants, pre-funded warrants, convertible notes and convertible preferred stock often include a "beneficial ownership limitation". The holder cannot exercise or convert to the extent that, afterwards, it (with its affiliates) would beneficially own more than a stated percentage of the outstanding common stock. The limit is commonly 4.99%, sometimes 9.99%, and many agreements let the holder raise it (up to 9.99%) on 61 days' notice.
Why it exists
Crossing 5% beneficial ownership of a registered class triggers Schedule 13D or 13G filings; crossing 10% can make a holder an insider subject to Section 16 short-swing profit rules. Staying under these thresholds avoids those obligations. Some exchange rules on change of control are also relevant.
Why it matters
A blocker does not reduce the total number of shares a holder can eventually receive; it controls the pace. A holder at its limit typically sells some common stock, falls back under the cap, then converts or exercises again. In financings with large share counts, this can produce a steady cycle of conversion and selling rather than one large block.
Worked example
Hypothetical: Company X has 50,000,000 shares outstanding. A holder owns 1,000,000 shares and pre-funded warrants for 6,000,000 more, with a 4.99% blocker. Solving 1,000,000 + x = 4.99% × (50,000,000 + x), it can exercise about 1,573,500 warrants now, ending with roughly 2,573,500 of 51,573,500 shares. To exercise the rest, it must sell shares first.
How to spot it
Search the warrant or note exhibit for "Beneficial Ownership Limitation". In a 13G, holders often state that their reported percentage reflects a blocker and excludes unexercisable securities. See Ownership blockers.
Related terms
Guides that use this term
Dilution 101 · 6 min read
Warrant Overhang: Counting the Shares That Do Not Exist Yet
What warrant overhang is, how to total it from the warrant table in a 10-Q, and how cash, cashless and pre-funded exercises change the share count.
Dilution 101 · 6 min read
Equity Lines of Credit (ELOCs): Why Up to $50 Million Is Not $50 Million
How an equity line of credit works, and why share caps, volume limits, ownership blockers and price declines usually keep proceeds far below the headline.
Toxic financing · 6 min read
Ownership Blockers: Why 4.99% and 9.99% Caps Do Not Limit Total Dilution
How beneficial ownership blockers work, why they cap a holder's stake at any moment but not the total shares issued, and a worked convert-and-sell cycle.
Toxic financing · 6 min read
Prepaid Advances: Cash Up Front, Repaid in Discounted Shares
How prepaid advance agreements work, how the discount, lookback, floor and cash-payment triggers decide the share count, with a worked example.
Toxic financing · 6 min read
Concurrent Private Placement Warrants: The Second Half of a Registered Direct
Why registered direct offerings often come with unregistered warrants in a concurrent private placement, and how to count the shares they add later.
Toxic financing · 6 min read
Reading Counterparty Disclosures: Holders, Placement Agents and Selling Shareholders
How to read the sections of a prospectus and 8-K that name who is on the other side of a financing, what they are paid, and how many shares they can sell.
Ownership & insiders · 6 min read
Schedule 13D vs 13G: Activist and Passive 5% Stakes
The difference between Schedule 13D and 13G, who may use each, the 5% trigger, and the shorter filing deadlines in force since 2024.