ELSE: Merger arbitrage gap narrows as acquisition closes in

Electro-Sensors heads into its May 8 earnings date with a deal on the table — and a stock price that hasn't quite caught up to the offer.

The story driving everything this week is the acquisition. German industrial automation firm steute Technologies signed a definitive merger agreement on April 21 to acquire Electro-Sensors for $7.75 per share in cash, valuing the company at roughly $26.9 million. With the stock closing at $7.64 on April 29, the spread between the current price and the deal price is just 11 cents — about 1.4%. That narrow gap reflects reasonable market confidence in the deal closing, but leaves almost nothing on the table for new buyers.

The short interest picture is genuinely unusual against this backdrop. Short interest collapsed nearly 59% week-on-week to just 2,158 shares — a tiny fraction of the float, barely 0.06% of free float. That is not a short story at all. What makes the history interesting is the spike on April 22: short interest briefly hit roughly 57,000 shares, coinciding with the day the deal became widely known. The ORTEX short score hit 62 that same day — well above its current 31.9 — before unwinding sharply. That one-day jump looks like speculative positioning around the announcement, not a sustained bear thesis.

Borrow costs have eased alongside the short interest retreat. The cost to borrow has dropped to 12.7%, down about 13% over the past week and well below its February peak above 24%. Availability is essentially unconstrained — the ORTEX figure shows 9,999% availability relative to short interest, meaning the lending pool is nowhere near stressed. None of this points to squeeze dynamics; the borrow market is calm.

Ownership is dominated by the Peterson family, who collectively hold more than half the company across five members. That concentrated ownership makes the deal structurally straightforward — there is no activist bloc to manage, and Caldwell Sutter Capital holds another 7%. Renaissance Technologies trimmed 4,500 shares at year-end 2025, a modest reduction. A Schedule 13D filed by Jesse Feldman on April 27 is worth watching: a 13D signals an activist or strategic holder crossing a 5% threshold, which could add a wrinkle to the merger vote timeline.

The next event on the calendar is the May 8 Q1 earnings release. Recent earnings reactions have been muted in both directions — a 1-day move of roughly -1.8% in April 2026, +3.0% in March, and -3.2% in November 2025. With a deal signed and a tight arb spread, the report itself matters less than merger-related disclosures: shareholder vote timing, any regulatory update, and whether that new 13D filer has anything to say about the $7.75 offer. The gap between $7.64 and $7.75 is the only trade left; what closes it — or widens it — will come from the deal process, not the income statement.