Matthew Tappin Biography and Net Worth

Insider of Stem

Matt Tappin serves as the President of Stem’s Software Division. In this role, Matt oversees all of Stem’s software and solar efforts, focusing on asset management, economic optimization and edge devices for energy storage and solar assets. Matt joined Stem as it became a public company in 2021 to lead corporate development, overseeing the company’s inorganic growth strategy, including mergers and acquisitions (M&A), investments, joint ventures, and related matters. Prior to joining Stem, he held senior corporate development positions at Royal Dutch Shell, where he focused on investments in the electricity sector, and Centrica, where he led corporate development for the distributed energy business globally. Earlier in his career, he was an investment banker in Lazard’s Power, Energy & Infrastructure Group and a corporate attorney at Simpson Thacher & Bartlett. Matt earned his J.D. from Duke University School of Law and B.A. from Washington University in St. Louis.

What is Matthew Tappin's net worth?: The estimated net worth of Matthew Tappin is at least $41.84 thousand as of July 2nd, 2026. Tappin owns 9,577 shares of Stem stock worth more than $41,842 as of September 25th. This net worth estimate does not reflect any other investments that Tappin may own. Learn More about Matthew Tappin's net worth.
How do I contact Matthew Tappin?: The corporate mailing address for Tappin and other Stem executives is 1400 Post Oak Boulevard, Suite 560, Houston, TX, 77056. Stem can also be reached via phone at 1-877-374-7836 and via email at [email protected]. Learn More on Matthew Tappin's contact information.
Has Matthew Tappin been buying or selling shares of Stem?: Within the last three months, Matthew Tappin has sold $7,818.60 in shares of Stem stock. Most recently, Matthew Tappin sold 996 shares of the business's stock in a transaction on Thursday, July 2nd. The shares were sold at an average price of $7.85, for a transaction totalling $7,818.60. Following the completion of the sale, the insider now directly owns 9,577 shares of the company's stock, valued at $75,179.45. Learn More on Matthew Tappin's trading history.
Who are Stem's active insiders?: Stem's insider roster includes William Bush (CFO), Michael Carlson (Insider), John Carrington (CEO), Adam Daley (Director), Larsh Johnson (CTO), Saul Laureles (Insider), Brian Musfeldt (CFO), Arun Narayanan (CEO), Prakesh Patel (Insider), Alan Russo (CRO), Matthew Tappin (Insider), and Mark Triplett (COO). Learn More on Stem's active insiders.
Are insiders buying or selling shares of Stem?: During the last twelve months, insiders at the sold shares 15 times. They sold a total of 20,050 shares worth more than $219,191.22. The most recent insider tranaction occured on July, 20th when CFO Brian Musfeldt sold 996 shares worth more than $6,085.56. Insiders at Stem own 5.1% of the company. Learn More about insider trades at Stem.
Information on this page was last updated on 7/20/2026.

Matthew Tappin Insider Trading History at Stem

Transaction Date	Buy/Sell	Number of Shares	Average Share Price	Total Transaction	Shares Held After Transaction
7/2/2026	Sell	996	$7.85	$7,818.60	9,577
3/11/2026	Sell	402	$10.83	$4,353.66	2,823
3/10/2026	Sell	655	$11.12	$7,283.60	3,225
3/4/2026	Sell	185	$10.00	$1,850.00	2,422
3/3/2026	Sell	300	$9.67	$2,901.00	2,607
2/20/2026	Sell	366	$11.40	$4,172.40	2,237
6/16/2025	Sell	1,041	$9.00	$9,369.00	1,872
5/30/2025	Sell	58	$9.00	$522.00	2,914
2/20/2025	Sell	406	$12.60	$5,115.60	1,641
5/28/2024	Sell	69	$26.40	$1,821.60	831
3/5/2024	Sell	191	$48.20	$9,206.20	3,339
2/20/2024	Sell	342	$61.00	$20,862.00	570
2/14/2024	Sell	227	$63.00	$14,301.00	227
1/3/2024	Sell	260	$71.20	$18,512.00	455

Matthew Tappin Buying and Selling Activity at Stem

Stem Company Overview

Stem, Inc. operates as a digitally connected, intelligent, and renewable energy storage network provider worldwide. The company offers energy storage hardware sourced from original equipment manufacturers (OEMs); edge hardware to aid in the collection of site data and real-time operation and control of the site and other optional equipment; and Athena, a software platform, which offers battery hardware and software-enabled services to operate the energy storage systems. It serves commercial and industrial enterprises, independent power producers, renewable project developers, and utilities and grid operators. The company was incorporated in 2009 and is headquartered in San Francisco, California.

Today's Range

Now: $4.35

$4.25

$4.59

50 Day Range

MA: $5.43

$3.81

$6.37

2 Week Range

Now: $4.35

$3.70

$32.23

Volume

421,267 shs

Average Volume

164,413 shs

Market Capitalization

$41.86 million

P/E Ratio

N/A

Dividend Yield

N/A

Beta

1.52