Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Sep 16, 2026.
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Counts cover the 28 most recent Form 4 filings Tradune holds for EOSE (filed Jul 7 – Sep 16, 2026); the score below covers only the trailing 90 days (2 buys, 6 sells). No completed check of EOSE's Form 4 list on SEC EDGAR is on record yet; the latest EOSE filing Tradune holds was filed Sep 16, 2026. This is not guaranteed to be the complete record — see EOSE's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 24 filings Tradune holds for EOSE filed Jul 27 – Sep 16, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
Open-market purchases and sales by insider
Insider
Buys
Sells
Shares bought
Shares sold
Value
Sumeet PuriChief Accounting Officer
0
3
—
107,084
−$410,611
Joe MastrangeloChief Executive Officer
0
2
—
409,154
−$1,554,546
Haiyan SongDirector
2
0
15,000
—
+$58,700
Nathan KroekerChief Commercial Officer
0
1
—
110,417
−$371,001
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Insider-activity score
39/ 100
Net insider sales
1 distinct buyer2 buy · 6 sell txofficer buying
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying.
“Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at EOSE
Insiders reported 2 open-market purchases of EOSE between Jul 7, 2026 and Sep 16, 2026, across 1 distinct buyer.
The most recent purchase was reported by Haiyan Song (Director) on Sep 14, 2026.
Grants, option exercises, and tax-withholding transactions are excluded from these counts.
Option exercisePerformance-Based Restricted Stock Units
87,500
—
—
—
Sep 14, 2026
Option exercise
87,500
—
323,945
+37%
Sep 14, 2026
† change in this filer’s own reported holding line (Form 4 Table I, col. 5), not of total company ownership; small prior holdings produce large percentages, so under 100 shares the prior holding is shown instead.
“10b5-1 box checked” = the filer checked the Form 4 box stating that a transaction on the filing was made under a plan intended to satisfy Rule 10b5-1(c); “10b5-1 box not checked” = the box was left blank, which does not prove that no plan exists. The box applies to Form 4s filed from April 1, 2023; older filings, and boxes we could not read, carry no tag. What the 10b5-1 box means.
Listing the 25 most recent of 28 Form 4 filings held for EOSE; the 3 older filings (filed Jul 7 – Jul 15, 2026) are counted above but not listed here — see EOSE's full Form 4 filing history on SEC EDGAR.
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to EOSE's (Sep 16, 2026).
How many insiders bought EOSE stock in these Form 4 filings?
1 distinct insider at Eos Energy Enterprises Inc reported 2 open-market purchases (Form 4 code P) of EOSE shares between Jul 7, 2026 and Sep 16, 2026, the most recent filed by Haiyan Song (Director) on Sep 14, 2026. Grants, option exercises, and tax-withholding transactions are excluded from these counts.
Who filed the most recent Form 4 for EOSE?
The most recent Form 4 on this page was filed by Joe Mastrangelo (Chief Executive Officer) on Sep 16, 2026, reporting 3 transactions. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market EOSE insider sale shown?
The largest open-market sale among the filings shown was 250,000 EOSE shares at $3.92 (about $980,000) by Joe Mastrangelo (Chief Executive Officer) on Sep 16, 2026. Value is shares × the price reported on the Form 4; that Form 4 has the Rule 10b5-1 box checked.
Do the recent EOSE insider purchases have the Form 4 10b5-1 box checked?
No. All 2 EOSE open-market purchases shown were reported with the Rule 10b5-1 box not checked. A blank box records what the filer disclosed; it does not prove that no plan exists. Latest: Haiyan Song (Director) on Sep 14, 2026, 5,000 shares.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.