Geron Corp. planned insider sales

In the last twelve months insiders at Geron Corp. filed 1 Form 144 notice of planned sales, 20,000 shares worth $27,400 at the time of filing, from 1 seller. The latest, filed 15 December 2025: James Ziegler (officer), 20,000 shares worth $27,400, planned for around 15 December 2025 through Morgan Stanley Smith Barney LLC Executive Financial Services.

Filed	Seller	Relationship	Shares	Value	Planned sale	Sold, per Form 4	Broker	How acquired	Filing
15 December 2025	James Ziegler	Officer	20,000	$27,400	15 December 2025	No matching Form 4 sale	Morgan Stanley Smith Barney LLC Executive Financial Services	Open Market Purchase	Form 144

A Form 144 is the notice an insider files with the SEC before selling restricted or control shares over the Rule 144 thresholds; it says what may be sold, not what was.

Value is the filer's own aggregate market value. Sold, per Form 4: the same seller's open-market sales on Form 4 from the notice's date to 90 days after, added up, as they appear on the insiders page; a holder who files no Form 4, such as some large holders, never shows one. What is a Form 144?