Michael L Speiser - Net Worth and Insider Trading

Michael L Speiser Net Worth

The estimated net worth of Michael L Speiser is at least $1.3 Billion dollars as of 2026-09-21. Michael L Speiser is the Director of Snowflake Inc and owns about 1,691,527 shares of Snowflake Inc (SNOW) stock worth over $562 Million. Michael L Speiser is the 10% Owner of Corcept Therapeutics Inc and owns about 3,871,617 shares of Corcept Therapeutics Inc (CORT) stock worth over $428 Million. Michael L Speiser is also the 10% Owner of Forty Seven Inc and owns about 3,030,299 shares of Forty Seven Inc (FTSV) stock worth over $289 Million. Besides these, Michael L Speiser also holds Everpure Inc (P) , Mattersight Corp (MATR) , Molecular Templates Inc (MTEMQ) . Details can be seen in Michael L Speiser's Latest Holdings Summary section.

Disclaimer: The insider information is derived from SEC filings. The estimated net worth is based on the final shares held after open market or private purchases and sales of common stock with a transaction code of "P" or "S" on Form 4, assuming that Michael L Speiser has not made any transactions after 2026-09-04 and currently still holds the listed stock(s). Please note that this estimate may not reflect the actual net worth.

Transaction Summary of Michael L Speiser

Are these stocks worth buying? — GuruFocus analysis for each holding

- GF

SNOW Snowflake Inc

43% of holdings · $559.9M

CORT Corcept Therapeutics Inc

34% of holdings · $432.9M

22% of holdings · $289.4M

1% of holdings · $6.5M

MTEMQ Molecular Templates Inc

MATR Mattersight Corp

0% of holdings · $3.3M

Michael L Speiser Insider Ownership Reports

Based on ownership reports from SEC filings, as the reporting owner, Michael L Speiser owns 12 companies in total, including Snowflake Inc (SNOW) , Everpure Inc (P) , and Forty Seven Inc (FTSV) among others .

Click here to see the complete history of Michael L Speiser’s form 4 insider trades.

Insider Ownership Summary of Michael L Speiser

Ticker	Company	Transaction Date	Type of Owner
SNOW	Snowflake Inc	2026-09-04	director & 10 percent owner
P	Everpure Inc	2018-07-09	director & 10 percent owner
FTSV	Forty Seven Inc	2018-07-02	10 percent owner
		2017-04-12	10 percent owner
		2017-10-11	10 percent owner
		2017-06-01	10 percent owner
		2014-10-01	10 percent owner
		2013-03-20	10 percent owner
		2009-10-16	10 percent owner
		2010-02-10	10 percent owner
		2024-03-19	10 percent owner
		2024-06-18	director

Michael L Speiser Latest Holdings Summary

Michael L Speiser currently owns a total of 6 stocks. Among these stocks, Michael L Speiser owns 1,691,527 shares of Snowflake Inc (SNOW) as of September 4, 2026, with a value of $562 Million and a weighting of 43.6%. Michael L Speiser owns 3,871,617 shares of Corcept Therapeutics Inc (CORT) as of May 12, 2008, with a value of $428 Million and a weighting of 33.17%. Michael L Speiser also owns 3,030,299 shares of Forty Seven Inc (FTSV) as of July 2, 2018, with a value of $289 Million and a weighting of 22.44%. The other 3 stocks Everpure Inc (P) , Mattersight Corp (MATR) , Molecular Templates Inc (MTEMQ) have a combined weighting of 0.79% among all his current holdings.

Latest Holdings of Michael L Speiser

Ticker	Company	Latest Transaction Date	Shares Owned	Current Price ($)	Current Value ($)
SNOW	Snowflake Inc	2026-09-04	1,691,527	332.43	562,314,321
CORT	Corcept Therapeutics Inc	2008-05-12	3,871,617	110.48	427,736,246
FTSV	Forty Seven Inc	2018-07-02	3,030,299	95.51	289,423,857
P	Everpure Inc	2018-07-09	66,362	104.14	6,910,939
MATR	Mattersight Corp	2017-06-01	1,218,709	2.68	3,260,047
MTEMQ	Molecular Templates Inc	2014-10-01	28,650	0.00	3

Holding Weightings of Michael L Speiser

Michael L Speiser Form 4 Trading Tracker

According to the SEC Form 4 filings, Michael L Speiser has made a total of 24 transactions in Snowflake Inc (SNOW) over the past 5 years, including 1 buys and 23 sells. The most-recent trade in Snowflake Inc is the sale of 50,741 shares on September 4, 2026, which brought Michael L Speiser around $18 Million.

According to the SEC Form 4 filings, Michael L Speiser has made a total of 0 transactions in Corcept Therapeutics Inc (CORT) over the past 5 years. The most-recent trade in Corcept Therapeutics Inc is the sale of 0 shares on May 12, 2008, which brought Michael L Speiser around $0.

According to the SEC Form 4 filings, Michael L Speiser has made a total of 0 transactions in Forty Seven Inc (FTSV) over the past 5 years. The most-recent trade in Forty Seven Inc is the acquisition of 140,480 shares on July 2, 2018, which cost Michael L Speiser around $2 Million.

More details on Michael L Speiser's insider transactions can be found in the Insider Trading History of Michael L Speiser table.

Insider Trading History of Michael L Speiser

* The information on this page (including Insider Trading Shares, Share Changes, Cost, etc.) is sourced exclusively from Form 4 filings and does not incorporate any data from 13F or 13D/G filings. As a result, it may differ from the values shown on the Guru page.

No transactions are available. GuruFocus only tracks and displays the purchase and sale of non-derivative security in open market or private transactions from SEC filings with the transaction code of P or S.

Total 0

Only the transactions in Open Market or Private Sale at the market prices are included. Other transactions such as conversion of derivative security or exercise of options are not included. Insiders are limited to only officers and/or directors of the company.

Michael L Speiser Trading Performance

GuruFocus tracks the stock performance after each of Michael L Speiser's buying transactions within different timeframes. To be detailed, the average return of stocks after 3 months bought by Michael L Speiser is -3.38%. GuruFocus also compares Michael L Speiser's trading performance to market benchmark return within the same time period. The performance of stocks bought by Michael L Speiser within 3 months outperforms 2 times out of 8 transactions in total compared to the return of S&P 500 within the same period.

You can select different timeframes to see how Michael L Speiser's insider trading performs compared to the benchmark.

Please note GuruFocus will not track the insiders’ transaction performance if he/she does not have buying transactions.

Performance of Michael L Speiser

Average Return

Average return per transaction

Outperforming Transactions

3 out of 8 outperforming transactions.

Each transaction is measured over a period and compared to .

	1 Month	3 Months	6 Months	1 Year	2 Years	3 Years
Return(%)	8.21
Relative Return to S&P 500(%)	5.35

Get the full picture on these stocks

See GF Score, valuation, financials, and warning signs for every stock Michael L Speiser owns.

- SNOW - CORT - FTSV - P - MATR - MTEMQ

View SNOW Analysis

Michael L Speiser Ownership Network

Ownership Network List of Michael L Speiser

No Data

Ownership Network Relation of Michael L Speiser

Michael L Speiser Owned Company Details

What does Snowflake Inc do?

Who are the key executives at Snowflake Inc?

Michael L Speiser is the director & 10 percent owner of Snowflake Inc. Other key executives at Snowflake Inc include Chief Revenue Officer Jonathan Mead Beaulier , Chief Accounting Officer Emily Ho , and EVP & Product Management Christian Kleinerman .

Snowflake Inc (SNOW) Insider Trades Summary

Over the past 18 months, Michael L Speiser made 21 insider transaction in Snowflake Inc (SNOW) with a net sale of 913,338. Other recent insider transactions involving Snowflake Inc (SNOW) include a net sale of 298,451 shares made by Christian Kleinerman , a net sale of 820,269 shares made by Benoit Dageville , and a net sale of 5,754,536 shares made by Frank Slootman .

In summary, during the past 3 months, insiders sold 1,488,406 shares of Snowflake Inc (SNOW) in total and bought 0 shares, with a net sale of 1,488,406 shares. During the past 18 months, 8,819,471 shares of Snowflake Inc (SNOW) were sold and 0 shares were bought by its insiders, resulting in a net sale of 8,819,471 shares.

Snowflake Inc (SNOW)'s detailed insider trading history can be found in Insider Trading Tracker table.

Snowflake Inc Insider Transactions

No Available Data

What does Everpure Inc do?

Who are the key executives at Everpure Inc?

Michael L Speiser is the director & 10 percent owner of Everpure Inc. Other key executives at Everpure Inc include director & CEO Charles H Giancarlo , director & Chief Technology Officer John Colgrove , and Chief Product Officer Ajay Singh .

Everpure Inc (P) Insider Trades Summary

Over the past 18 months, Michael L Speiser made no insider transaction in Everpure Inc (P). Other recent insider transactions involving Everpure Inc (P) include a net sale of 2,534,265 shares made by John Colgrove , a net sale of 860,000 shares made by Charles H Giancarlo , and a net sale of 64,860 shares made by Ajay Singh .

In summary, during the past 3 months, insiders sold 1,197,520 shares of Everpure Inc (P) in total and bought 0 shares, with a net sale of 1,197,520 shares. During the past 18 months, 3,560,263 shares of Everpure Inc (P) were sold and 0 shares were bought by its insiders, resulting in a net sale of 3,560,263 shares.

Everpure Inc (P)'s detailed insider trading history can be found in Insider Trading Tracker table.

Everpure Inc Insider Transactions

No Available Data

What does Forty Seven Inc do?

Who are the key executives at Forty Seven Inc?

Michael L Speiser is the 10 percent owner of Forty Seven Inc. Other key executives at Forty Seven Inc include Chief Financial Officer Ann D Rhoads , 10 percent owner Lightspeed General Partner X, L.p. , and 10 percent owner Lightspeed Ultimate General Partner X, Ltd. .

Forty Seven Inc (FTSV) Insider Trades Summary

In summary, during the past 3 months, insiders sold 0 shares of Forty Seven Inc (FTSV) in total and bought 0 shares, with a net sale of 0 shares. During the past 18 months, 0 shares of Forty Seven Inc (FTSV) were sold and 0 shares were bought by its insiders, resulting in a net sale of 0 shares.

Forty Seven Inc (FTSV)'s detailed insider trading history can be found in Insider Trading Tracker table.

Forty Seven Inc Insider Transactions

No Available Data

What does Yext Inc do?

Who are the key executives at Yext Inc?

Michael L Speiser is the 10 percent owner of Yext Inc. Other key executives at Yext Inc include General Counsel Ho Shin , director & 10 percent owner Cynthia Paul , and 10 percent owner Lynrock Lake Lp .

Yext Inc (YEXT) Insider Trades Summary

Over the past 18 months, Michael L Speiser made no insider transaction in Yext Inc (YEXT). Other recent insider transactions involving Yext Inc (YEXT) include a net sale of 60,000 shares made by Ho Shin , a net sale of 4,948,782 shares made by Lead Edge Capital Management, Llc , and a net purchase of 133,000 shares made by Seth H. Waugh .

In summary, during the past 3 months, insiders sold 30,000 shares of Yext Inc (YEXT) in total and bought 76,190 shares, with a net purchase of 46,190 shares. During the past 18 months, 5,029,782 shares of Yext Inc (YEXT) were sold and 209,190 shares were bought by its insiders, resulting in a net sale of 4,820,592 shares.

Yext Inc (YEXT)'s detailed insider trading history can be found in Insider Trading Tracker table.

Yext Inc Insider Transactions

No Available Data

What does Venus Concept Inc do?

Who are the key executives at Venus Concept Inc?

Michael L Speiser is the 10 percent owner of Venus Concept Inc. Other key executives at Venus Concept Inc include 10 percent owner Madryn Asset Management, Lp , 10 percent owner Michael Willingham Masters , and President Global Sales Ross Portaro .

Venus Concept Inc (VERO) Insider Trades Summary

Over the past 18 months, Michael L Speiser made no insider transaction in Venus Concept Inc (VERO). Other recent insider transactions involving Venus Concept Inc (VERO) include a net purchase of 37,537,187 shares made by Madryn Asset Management, Lp ,

In summary, during the past 3 months, insiders sold 0 shares of Venus Concept Inc (VERO) in total and bought 0 shares, with a net sale of 0 shares. During the past 18 months, 0 shares of Venus Concept Inc (VERO) were sold and 37,537,187 shares were bought by its insiders, resulting in a net purchase of 37,537,187 shares.

Venus Concept Inc (VERO)'s detailed insider trading history can be found in Insider Trading Tracker table.

Venus Concept Inc Insider Transactions

No Available Data

What does Mattersight Corp do?

Who are the key executives at Mattersight Corp?

Michael L Speiser is the 10 percent owner of Mattersight Corp. Other key executives at Mattersight Corp include director & 10 percent owner Tench Coxe , director & CFO David B Mullen , and 10 percent owner Jeffrey W Bird .

Mattersight Corp (MATR) Insider Trades Summary

In summary, during the past 3 months, insiders sold 0 shares of Mattersight Corp (MATR) in total and bought 0 shares, with a net sale of 0 shares. During the past 18 months, 0 shares of Mattersight Corp (MATR) were sold and 0 shares were bought by its insiders, resulting in a net sale of 0 shares.

Mattersight Corp (MATR)'s detailed insider trading history can be found in Insider Trading Tracker table.

Mattersight Corp Insider Transactions

No Available Data

What does Molecular Templates Inc do?

Who are the key executives at Molecular Templates Inc?

Michael L Speiser is the 10 percent owner of Molecular Templates Inc. Other key executives at Molecular Templates Inc include 10 percent owner Biotech Target N V , Chief Medical Officer Maurizio Voi , and CFO & Treasurer Sean Mclennan .

Molecular Templates Inc (MTEMQ) Insider Trades Summary

In summary, during the past 3 months, insiders sold 0 shares of Molecular Templates Inc (MTEMQ) in total and bought 0 shares, with a net sale of 0 shares. During the past 18 months, 0 shares of Molecular Templates Inc (MTEMQ) were sold and 0 shares were bought by its insiders, resulting in a net sale of 0 shares.

Molecular Templates Inc (MTEMQ)'s detailed insider trading history can be found in Insider Trading Tracker table.

Molecular Templates Inc Insider Transactions

No Available Data

What does Dex Liquidating Co do?

Who are the key executives at Dex Liquidating Co?

Michael L Speiser is the 10 percent owner of Dex Liquidating Co. Other key executives at Dex Liquidating Co include other: Former Director Younger William H Jr , V.P. & Finance & CFO & Secretary Newell Robert Y Iv , and VP,Worldwide Sales & Marketing Liam Burns .

Dex Liquidating Co (DXTRQ) Insider Trades Summary

In summary, during the past 3 months, insiders sold 0 shares of Dex Liquidating Co (DXTRQ) in total and bought 0 shares, with a net sale of 0 shares. During the past 18 months, 0 shares of Dex Liquidating Co (DXTRQ) were sold and 0 shares were bought by its insiders, resulting in a net sale of 0 shares.

Dex Liquidating Co (DXTRQ)'s detailed insider trading history can be found in Insider Trading Tracker table.

Dex Liquidating Co Insider Transactions

No Available Data

What does Corcept Therapeutics Inc do?

Who are the key executives at Corcept Therapeutics Inc?

Michael L Speiser is the 10 percent owner of Corcept Therapeutics Inc. Other key executives at Corcept Therapeutics Inc include President & Oncology Roberto Wandenkolk Vieira , Chief Accounting Officer Joseph Douglas Lyon , and See Remarks Sean Maduck .

Corcept Therapeutics Inc (CORT) Insider Trades Summary

Over the past 18 months, Michael L Speiser made no insider transaction in Corcept Therapeutics Inc (CORT). Other recent insider transactions involving Corcept Therapeutics Inc (CORT) include a net sale of 349,000 shares made by William Guyer , a net sale of 487,652 shares made by Sean Maduck , and a net sale of 261,961 shares made by Joseph Douglas Lyon .

In summary, during the past 3 months, insiders sold 506,415 shares of Corcept Therapeutics Inc (CORT) in total and bought 0 shares, with a net sale of 506,415 shares. During the past 18 months, 2,005,151 shares of Corcept Therapeutics Inc (CORT) were sold and 100,000 shares were bought by its insiders, resulting in a net sale of 1,905,151 shares.

Corcept Therapeutics Inc (CORT)'s detailed insider trading history can be found in Insider Trading Tracker table.

Corcept Therapeutics Inc Insider Transactions

No Available Data

What does QuinStreet Inc do?

Who are the key executives at QuinStreet Inc?

Michael L Speiser is the 10 percent owner of QuinStreet Inc. Other key executives at QuinStreet Inc include CFO Gregory Wong , director & 10 percent owner & Chief Executive Officer Douglas Valenti , and Chief Technology Officer Nina Bhanap .

QuinStreet Inc (QNST) Insider Trades Summary

Over the past 18 months, Michael L Speiser made no insider transaction in QuinStreet Inc (QNST). Other recent insider transactions involving QuinStreet Inc (QNST) include a net sale of 70,395 shares made by Gregory Wong , a net sale of 40,000 shares made by Asmau Ahmed , and a net sale of 751,631 shares made by Douglas Valenti .

In summary, during the past 3 months, insiders sold 839,969 shares of QuinStreet Inc (QNST) in total and bought 0 shares, with a net sale of 839,969 shares. During the past 18 months, 862,026 shares of QuinStreet Inc (QNST) were sold and 0 shares were bought by its insiders, resulting in a net sale of 862,026 shares.

QuinStreet Inc (QNST)'s detailed insider trading history can be found in Insider Trading Tracker table.

QuinStreet Inc Insider Transactions

No Available Data

What does Astera Labs Inc do?

Who are the key executives at Astera Labs Inc?

Michael L Speiser is the 10 percent owner of Astera Labs Inc. Other key executives at Astera Labs Inc include director & Chief Executive Officer Jitendra Mohan , General Counsel and Secretary Philip Mazzara , and director & See Remarks Sanjay Gajendra .

Astera Labs Inc (ALAB) Insider Trades Summary

Over the past 18 months, Michael L Speiser made no insider transaction in Astera Labs Inc (ALAB). Other recent insider transactions involving Astera Labs Inc (ALAB) include a net sale of 2,279,282 shares made by Jitendra Mohan , a net sale of 2,454,282 shares made by Sanjay Gajendra , and a net sale of 1,143,000 shares made by Manuel Alba .

In summary, during the past 3 months, insiders sold 592,244 shares of Astera Labs Inc (ALAB) in total and bought 0 shares, with a net sale of 592,244 shares. During the past 18 months, 7,033,516 shares of Astera Labs Inc (ALAB) were sold and 0 shares were bought by its insiders, resulting in a net sale of 7,033,516 shares.

Astera Labs Inc (ALAB)'s detailed insider trading history can be found in Insider Trading Tracker table.

Astera Labs Inc Insider Transactions

No Available Data

What does Workday Inc do?

Who are the key executives at Workday Inc?

Michael L Speiser is the director of Workday Inc. Other key executives at Workday Inc include 10 percent owner David A Duffield , Chief Accounting Officer Mark S. Garfield , and President & Prod. and Tech. Gerrit S Kazmaier .

Workday Inc (WDAY) Insider Trades Summary

Over the past 18 months, Michael L Speiser made no insider transaction in Workday Inc (WDAY). Other recent insider transactions involving Workday Inc (WDAY) include a net sale of 3,850,908 shares made by David A Duffield , a net sale of 6,319 shares made by Mark S. Garfield , and a net sale of 30,000 shares made by Zane Rowe .

In summary, during the past 3 months, insiders sold 935,421 shares of Workday Inc (WDAY) in total and bought 0 shares, with a net sale of 935,421 shares. During the past 18 months, 3,983,087 shares of Workday Inc (WDAY) were sold and 0 shares were bought by its insiders, resulting in a net sale of 3,983,087 shares.

Workday Inc (WDAY)'s detailed insider trading history can be found in Insider Trading Tracker table.

Workday Inc Insider Transactions

No Available Data

Michael L Speiser Mailing Address

Above is the net worth, insider trading, and ownership report for Michael L Speiser. Based on the public information released on the U.S. Securities and Exchange Commission (SEC) website, Michael L Speiser's mailing address is: Palo Alto Ca 94304-1005.

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