some insider is buying one share of TPL every single day for a month. anyone know what this is?

been messing with SEC insider filings data and found something i cant explain. Texas Pacific Land (TPL, the oil royalties company) has Horizon Kinetics, a big holder, buying literally one share of the stock on the open market almost every trading day for the last month. not 100 shares, not 1000. one. total capital deployed maybe $8000 over the month, at prices between $351 and $435. my best guess is its a 10b5-1 plan (the pre-committed insider trading plans) set to buy 1 share per day. horizon a