Stocks › Specialty Industrial Machinery › EROC

ERock EROC

US equityMarket cap rank #3593Specialty Industrial Machinery Top Gainers Yesterday

$13.08 −$0.56 (-4.11%)

Pre-market · Oct 8, 9:00 am ET · After hours $13.20 +0.92%

Open$13.30

Prev close$13.64

Day range$12.89 – $13.68

Volume2.31M

Market cap$630.12M

P/E (TTM)–

Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership114.5%+1.79 pts vs. prior quarter

Institutions holding92-2 vs. prior quarter

Insider trades (recent)6 buys / 10 sellsNet selling

Short interest19.20% of floatDays to cover 3.8 · as of 15 Sep 2026

Short-sale volume share20.6%5-day average of daily volume

Short-sale volume as % of daily volume

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$1.86M (7 inflow days, 13 outflow days).

Net flow by order size, last 20 sessions

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 78.5% of shares outstanding.

Largest holders

Energy Impact Partners LP40.39%
John Carrington13.65%
Paul Froutan12.87%
Corey Amthor6.58%
R. Ian Blakely5.05%
T. Rowe Price Group, Inc.4.72%
Balyasny Asset Management L.P.4.36%
Cinctive Capital Management LP4.04%

By investor type

VC/PE Fund40.49%
Individual/Insider40.09%
Hedge Fund34.44%
Mutual Fund34.10%
Private Company3.20%
Public Company0.89%
Family Office/Trust0.78%
Government Pension Fund0.55%

Reported short interest has risen from 13.19% to 19.20% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

Holder	Type	Period	Share change	New stake
T. Rowe Price Group, Inc.	Mutual Fund	2026/Q3	+2,275,983	4.7%
Balyasny Asset Management L.P.	Hedge Fund	2026/Q3	+2,099,619	4.4%
Cinctive Capital Management LP	Hedge Fund	2026/Q3	+1,947,261	4.0%
Encompass Capital Advisors LLC	Hedge Fund	2026/Q3	+1,900,000	3.9%
Zimmer Partners, LP	Hedge Fund	2026/Q3	+1,891,745	3.9%
Columbia Management Investment Advisers, LLC	Mutual Fund	2026/Q3	+1,825,179	3.8%
MFS Investment Management	Mutual Fund	2026/Q3	+1,776,265	3.7%
AllianceBernstein	Mutual Fund	2026/Q3	+1,702,121	3.5%
Citadel Advisors LLC	Hedge Fund	2026/Q3	+1,505,997	3.1%
Value Aligned Research Advisors, LLC	Mutual Fund	2026/Q3	+1,345,920	2.8%
Alyeska Investment Group, L.P.	Hedge Fund	2026/Q3	+1,276,391	2.6%
Vanguard Portfolio Management, LLC	Mutual Fund	2026/Q3	+1,116,375	2.3%
Vanguard Capital Management, LLC	Mutual Fund	2026/Q3	+1,096,443	2.3%
Pictet Asset Management Limited	Mutual Fund	2026/Q3	+1,056,681	2.2%
CIBC World Markets Corp.	Private Company	2026/Q3	+1,000,000	2.1%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
10 Jun 2026	Livingston Satterthwaite	Former Independent Director	Other Acquisition	+13,024	–	13,024
10 Jun 2026	Charles Boynton	Former Independent Director	Other Acquisition	+13,024	–	13,024
10 Jun 2026	R. Ian Blakely	Chief Financial Officer	Sale to Issuer	-449,233	–	4,487,528
10 Jun 2026	Dan Brouillette	Former Independent Director	Other Acquisition	+13,024	–	13,024
10 Jun 2026	Mark Patterson	Former Independent Director	Other Acquisition	+13,024	–	13,024
10 Jun 2026	Thomas McAndrew	Founder	Other Disposition	-93,023	–	22,536,568
10 Jun 2026	Thomas McAndrew	Founder	Private Disposition	-93,023	–	16,540,099
10 Jun 2026	Energy Impact Partners LP		Other Acquisition	+19,350,897	–	19,350,897
10 Jun 2026	Energy Impact Partners LP		Other Disposition	-6,041,206	–	83,355,210
10 Jun 2026	Energy Impact Partners LP		Private Disposition	-6,041,206	–	83,355,210
10 Jun 2026	Corey Amthor	President	Sale to Issuer	-617,442	–	5,623,308
10 Jun 2026	Walter Mcandrew		Other Acquisition	+50,550	–	–
10 Jun 2026	Walter Mcandrew		Other Disposition	-372,093	–	–
10 Jun 2026	Walter Mcandrew		Private Disposition	-372,093	–	5,996,469
8 Jun 2026	R. Ian Blakely	Chief Financial Officer	Initial Statement of Beneficial	+0	–	3,675,515
8 Jun 2026	Dan Brouillette	Former Independent Director	Initial Statement of Beneficial	+0	–	580,107
8 Jun 2026	John Carrington	Chief Executive Officer	Initial Statement of Beneficial	+0	–	12,510,537
8 Jun 2026	Mark Patterson	Former Independent Director	Initial Statement of Beneficial	+0	–	580,107
8 Jun 2026	Thomas McAndrew	Founder	Initial Statement of Beneficial	+0	–	16,633,122
8 Jun 2026	Energy Impact Partners LP		Initial Statement of Beneficial	+0	–	107,739

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report date	Shares short	% of float	Days to cover
15 Sep 2026	9,251,575	19.2%	3.8
31 Aug 2026	8,037,588	16.7%	3.0
14 Aug 2026	6,249,733	13.0%	1.8
31 Jul 2026	5,691,058	11.8%	3.5
15 Jul 2026	5,065,157	10.5%	3.7
30 Jun 2026	6,355,764	13.2%	3.0

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