Key points

  • A Black Stone Minerals director put $686,290 into the partnership's common units in a single transaction. The buy covers 50,000 units and is dated November 9th, 2026.
  • Every unit went through at one price, $13.7258. The filing shows no range, which is consistent with a single block rather than a series of fills across a session.
  • The buyer is Carter Thomas L Jr, a director at the partnership. He is an individual filer, not an institution, and the activity arrives as one Form 4 rather than a run of staggered reports.
  • The units last traded at $13.98, above the purchase price. Black Stone Minerals carries a market capitalization of roughly $2.98 billion in the Crude Petroleum and Natural Gas sector.

Black Stone Minerals, L.P. drew an open-market purchase from one of its own directors on November 9th, 2026. Carter Thomas L Jr bought 50,000 common units at $13.7258 each, a total of $686,290. That is the entire insider footprint in this report: one filing, one price, one date.

The units last changed hands at $13.98, which sits above the level where the director transacted. The partnership's market capitalization stands at roughly $2.98 billion.

What the filing shows

The disclosure is unusually clean. The low and the high of the reported price range are identical at $13.7258, so the whole 50,000 unit position was established at a single execution price. Form 4s that report scattered fills typically carry a weighted average and a range; this one does not.

The dollars involved, $686,290, make this a sizable individual commitment rather than a token purchase or a routine equity award settlement. The filing reflects an acquisition of units by a director, reported in a single submission.

Who the buyer is

Carter Thomas L Jr is listed as a Director of Black Stone Minerals, L.P. Directors sit on the governance side of the business rather than running daily operations, but they see board materials, reserve discussions and distribution policy ahead of the market. That is the reason director purchases get read closely even when the dollar figures are modest next to a company's market value.

What the filing does not do is explain motive. Form 4 records the what, the when and the how much. Anything beyond that is inference, and this desk does not print inference as fact. The useful takeaway is narrow: a board member added 50,000 units with his own money on November 9th, 2026.

Where the price sits

The last price of $13.98 is above the $13.7258 paid in the transaction. For readers tracking whether insider buys land near lows or near recent strength, the chart below gives the twelve month context around that $13.7258 print.

Black Stone Minerals operates in Crude Petroleum and Natural Gas, a group where unit prices track commodity strips and distribution expectations more than quarter to quarter earnings surprises. A roughly $2.98 billion market capitalization places it well below the large integrated names and above the small end of the royalty and mineral group.

What that leaves

The case for paying attention is straightforward. A director spent $686,290 of personal capital on the open market at a fixed price, and the filing count is one, meaning this was not spread across weeks of small additions that might be attributed to a scheduled plan.

The case for restraint is equally straightforward. A single purchase from a single director is one data point. There is no cluster here, no participation from other board members or officers in this report, and $686,290 is small against a market capitalization near $2.98 billion. Mineral and royalty partnerships also carry distribution variability tied to commodity prices, and no insider transaction changes that.

Readers who follow Black Stone Minerals should treat the November 9th, 2026 buy as a dated fact about one director's position, then weigh it against the partnership's own disclosures on production, acreage and distributions. The filing establishes that a board member paid $13.7258 for 50,000 units. It establishes nothing more.

Sources: SEC Form 4 filings submitted via EDGAR and reviewed by InsiderBuying.com, covering transactions dated November 9th, 2026.

Informational only, not investment advice.