Eos Energy Enterprises Inc. Insider Trading

EOSE

Last 12 months

Insiders bought 752K and sold $18.1M on the open market.

23% of the selling was scheduled in advance under 10b5-1 plans. Director Russell Monoki Stidolph sold $11.5M on Dec 8, 2025, 24% of their stake, outside a plan.

Net open-market

−$17.4M

5 buys · 20 sales

Under a 10b5-1 plan

23%

of the value sold

Insiders who bought / sold

4 / 8

executives and directors

Last open-market buy

Sep 2026

Sep 14, 2026

Get an email when EOSE's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Oct 29	Michelle Buczkowski Chief Commercial Officer	Sold10b5-1 plan	50,000	$2.00	100K	31%	Form 4
Sep 16	Sumeet Puri Chief Accounting Officer	Sold10b5-1 plan	43,750	$3.92	172K	14%	Form 4
Sep 16	Joe Mastrangelo Chief Executive Officer	Sold10b5-1 plan	250,000	$3.92	980K	9.8%	Form 4
Sep 11 – 14	Haiyan Song Director	Bought 2 parts	15,000	$3.91 average	59K	New	Form 4
Sep 9	Sumeet Puri Chief Accounting Officer	Sold10b5-1 plan	34,167	$4.13	141K	13%	Form 4
Jul 28	Sumeet Puri Chief Accounting Officer	Sold10b5-1 plan	29,167	$3.36	98K	13%	Form 4
Jul 28	Nathan Kroeker Chief Commercial Officer	Sold10b5-1 plan	110,417	$3.36	371K	11%	Form 4
Jul 27	Joe Mastrangelo Chief Executive Officer	SoldNo plan	159,154	$3.61	575K	7.6%	Form 4
Jul 7	Nathan Kroeker CCO and Interim CFO	Sold10b5-1 plan	79,309	$4.68	371K	9.3%	Form 4
Jun 30	Sumeet Puri Chief Accounting Officer	Sold10b5-1 plan	8,823	$5.86	52K	4.8%	Form 4
Jun 30	Michelle Buczkowski Chief Administration Officer	Sold10b5-1 plan	11,469	$5.87	67K	16%	Form 4
Jun 30	Michael W Silberman Chief Legal Officer	Sold10b5-1 plan	14,998	$5.87	88K	4.8%	Form 4
Jun 30	Nathan Kroeker CCO and Interim CFO	Sold10b5-1 plan	35,289	$5.86	207K	4.8%	Form 4
May 28	Marian Walters Director	SoldNo plan	30,000	$9.18	275K	16%	Form 4
May 20	Marian Walters Director	SoldNo plan	22,319	$7.20	161K	12%	Form 4
May 19	Marian Walters Director	SoldNo plan	7,681	$7.07	54K	4.5%	Form 4
Mar 9	David Urban Director	Bought	16,250	$6.16	100K	35%	Form 4
Mar 4	Joe Mastrangelo Chief Executive Officer	Bought	23,900	$6.58	157K	1.6%	Form 4
Mar 2	Alexander Dimitrief Director	Bought	15,000	$6.04	91K	6.5%	Form 4
Mar 2	Joe Mastrangelo Chief Executive Officer	Bought	60,000	$5.75	345K	4.3%	Form 4
Jan 26	Nathan Kroeker CCO and Interim CFO	Sold10b5-1 plan	50,000	$16.04	802K	7.0%	Form 4
Jan 23	Michael W Silberman Chief Legal Officer	Sold10b5-1 plan	41,667	$17.74	739K	13%	Form 4
Dec 5, 2025 – Dec 8, 2025	Russell Monoki Stidolph Director	SoldNo plan 4 parts	766,134	$14.97 average	$11.5M	24%	Form 4
Dec 4, 2025 – Dec 5, 2025	Jeffrey S Bornstein Director	SoldNo plan 2 parts	40,328	$15.19 average	613K	26%	Form 4
Dec 4, 2025	Marian Walters Director	SoldNo plan	50,000	$15.81	791K	26%	Form 4
Sep 8, 2025	Sumeet Puri Chief Accounting Officer	Sold10b5-1 plan 2 parts	40,501	$7.11 average	288K	20%	Form 4
Sep 3, 2025	Marian Walters Director	SoldNo plan	50,000	$7.90	395K	26%	Form 4
Aug 4, 2025	Alexander Dimitrief Director	SoldNo plan	45,000	$6.00	270K	16%	Form 4
Jul 29, 2025	Joe Mastrangelo Chief Executive Officer	Sold10b5-1 plan	166,667	$5.94	990K	11%	Form 4
Jul 29, 2025	Nathan Kroeker CCO and Interim CFO	Sold10b5-1 plan	99,375	$5.94	590K	14%	Form 4
Jul 29, 2025	Michael W Silberman General Counsel	Sold10b5-1 plan	65,625	$5.94	390K	21%	Form 4
Jul 29, 2025	Sumeet Puri Chief Accounting Officer	Sold10b5-1 plan	17,500	$5.94	104K	11%	Form 4
Jul 7, 2025 – Jul 8, 2025	Nathan Kroeker CCO and Interim CFO	Sold10b5-1 plan 2 parts	71,378	$5.02 average	358K	13%	Form 4
Jul 8, 2025	Joe Mastrangelo Chief Executive Officer	Sold10b5-1 plan	127,152	$4.92	626K	9.3%	Form 4
May 16, 2025	Joe Mastrangelo Chief Executive Officer	SoldNo plan	270,384	$6.86	$1.85M	20%	Form 4
May 16, 2025	Nathan Kroeker Chief Commercial Officer	SoldNo plan	152,856	$6.86	$1.05M	27%	Form 4
May 16, 2025	Michael W Silberman General Counsel	SoldNo plan	100,943	$6.86	692K	38%	Form 4
May 16, 2025	Sumeet Puri Chief Accounting Officer	SoldNo plan	36,173	$6.86	248K	27%	Form 4

Oct 2910b5-1 plan
Michelle Buczkowski
Chief Commercial Officer · sold 50,000 at $2.00
100K
31% of stake
Sep 1610b5-1 plan
Sumeet Puri
Chief Accounting Officer · sold 43,750 at $3.92
172K
14% of stake
Sep 1610b5-1 plan
Joe Mastrangelo
Chief Executive Officer · sold 250,000 at $3.92
980K
9.8% of stake
Sep 11 – 14
Haiyan Song
Director · bought 15,000 at avg $3.91
59K
New position
Sep 910b5-1 plan
Sumeet Puri
Chief Accounting Officer · sold 34,167 at $4.13
141K
13% of stake
Jul 2810b5-1 plan
Sumeet Puri
Chief Accounting Officer · sold 29,167 at $3.36
98K
13% of stake
Jul 2810b5-1 plan
Nathan Kroeker
Chief Commercial Officer · sold 110,417 at $3.36
371K
11% of stake
Jul 27No plan
Joe Mastrangelo
Chief Executive Officer · sold 159,154 at $3.61
575K
7.6% of stake
Jul 710b5-1 plan
Nathan Kroeker
CCO and Interim CFO · sold 79,309 at $4.68
371K
9.3% of stake
Jun 3010b5-1 plan
Sumeet Puri
Chief Accounting Officer · sold 8,823 at $5.86
52K
4.8% of stake
Jun 3010b5-1 plan
Michelle Buczkowski
Chief Administration Officer · sold 11,469 at $5.87
67K
16% of stake
Jun 3010b5-1 plan
Michael W Silberman
Chief Legal Officer · sold 14,998 at $5.87
88K
4.8% of stake
Jun 3010b5-1 plan
Nathan Kroeker
CCO and Interim CFO · sold 35,289 at $5.86
207K
4.8% of stake
May 28No plan
Marian Walters
Director · sold 30,000 at $9.18
275K
16% of stake
May 20No plan
Marian Walters
Director · sold 22,319 at $7.20
161K
12% of stake
May 19No plan
Marian Walters
Director · sold 7,681 at $7.07
54K
4.5% of stake
Mar 9
David Urban
Director · bought 16,250 at $6.16
100K
35% of stake
Mar 4
Joe Mastrangelo
Chief Executive Officer · bought 23,900 at $6.58
157K
1.6% of stake
Mar 2
Alexander Dimitrief
Director · bought 15,000 at $6.04
91K
6.5% of stake
Mar 2
Joe Mastrangelo
Chief Executive Officer · bought 60,000 at $5.75
345K
4.3% of stake
Jan 2610b5-1 plan
Nathan Kroeker
CCO and Interim CFO · sold 50,000 at $16.04
802K
7.0% of stake
Jan 2310b5-1 plan
Michael W Silberman
Chief Legal Officer · sold 41,667 at $17.74
739K
13% of stake
Dec 5, 2025 – Dec 8, 2025No plan
Russell Monoki Stidolph
Director · sold 766,134 at avg $14.97
$11.5M
24% of stake
Dec 4, 2025 – Dec 5, 2025No plan
Jeffrey S Bornstein
Director · sold 40,328 at avg $15.19
613K
26% of stake
Dec 4, 2025No plan
Marian Walters
Director · sold 50,000 at $15.81
791K
26% of stake
Sep 8, 202510b5-1 plan
Sumeet Puri
Chief Accounting Officer · sold 40,501 at avg $7.11
288K
20% of stake
Sep 3, 2025No plan
Marian Walters
Director · sold 50,000 at $7.90
395K
26% of stake
Aug 4, 2025No plan
Alexander Dimitrief
Director · sold 45,000 at $6.00
270K
16% of stake
Jul 29, 202510b5-1 plan
Joe Mastrangelo
Chief Executive Officer · sold 166,667 at $5.94
990K
11% of stake
Jul 29, 202510b5-1 plan
Nathan Kroeker
CCO and Interim CFO · sold 99,375 at $5.94
590K
14% of stake
Jul 29, 202510b5-1 plan
Michael W Silberman
General Counsel · sold 65,625 at $5.94
390K
21% of stake
Jul 29, 202510b5-1 plan
Sumeet Puri
Chief Accounting Officer · sold 17,500 at $5.94
104K
11% of stake
Jul 7, 2025 – Jul 8, 202510b5-1 plan
Nathan Kroeker
CCO and Interim CFO · sold 71,378 at avg $5.02
358K
13% of stake
Jul 8, 202510b5-1 plan
Joe Mastrangelo
Chief Executive Officer · sold 127,152 at $4.92
626K
9.3% of stake
May 16, 2025No plan
Joe Mastrangelo
Chief Executive Officer · sold 270,384 at $6.86
$1.85M
20% of stake
May 16, 2025No plan
Nathan Kroeker
Chief Commercial Officer · sold 152,856 at $6.86
$1.05M
27% of stake
May 16, 2025No plan
Michael W Silberman
General Counsel · sold 100,943 at $6.86
692K
38% of stake
May 16, 2025No plan
Sumeet Puri
Chief Accounting Officer · sold 36,173 at $6.86
248K
27% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch EOSE, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Held by ETFs

EOSE is in 38 US ETFs. The largest of them, with EOSE's weight in each:

Spot a number that looks wrong? Check it in EOSE's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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