Education
About Us
Working with TipRanks
Follow Us
Brian Richard Ostroff Insider Profile
4 Followers
Brian Richard Ostroff, Head of Strategy at Arianne Phosphate, holds 5.37M shares in Arianne Phosphate (Ticker: DRRSF), holds 4.33M shares in Madoro Metals Corp (Ticker: TSE:MDM). Most recently, Brian Richard Ostroff Bought ― shares of Arianne Phosphate on Dec 12, 2025 for an estimated value of $70.47K.
Brian Richard Ostroff Arianne Phosphate (DRRSF)Head of Strategy
Arianne Phosphate (DRRSF)
Head of Strategy
Ranked #74,403 out of 105,077 Corporate Insiders
Profitable Transactions
6 out of 11 Profitable Transactions
Average Return
-8.20%
Average return per transaction
Time Frame
Compare to
Insider Holdings
Insider Roles
Roles that Brian Richard Ostroff holds in companies
Most Profitable Insider Trade
The most profitable trade made by Brian Richard Ostroff
Brian Richard Ostroff's Trading History
Arianne Phosphate
Dec 12, 2025
Head of Strategy
Informative Buy
70.47K
$848.95K
Madoro Metals Corp
Jun 11, 2022
Director
Uninformative Buy
―
C$129.81K
List of latest transactions for each holding click on a transaction to see Brian Richard Ostroff's performance on stock
You May Also Like
Brian Richard Ostroff insider profile FAQ
What is the percentage of profitable transactions made by Brian Richard Ostroff?
The percentage of profitable transactions made by Brian Richard Ostroff is 55%.
What is the average return per transaction made by Brian Richard Ostroff?
The average return per transaction made by Brian Richard Ostroff is -8.20%.
What stocks does Brian Richard Ostroff hold?
Brian Richard Ostroff holds: DRRSF, TSE:MDM stocks.
What was Brian Richard Ostroff’s latest transaction?
Brian Richard Ostroff latest transaction was an Informative Buy of $70.47K.
What was Brian Richard Ostroff's most profitable transaction?
Brian Richard Ostroff’s most profitable transaction was an Informative Buy of DRRSF stock on December 11, 2014. The return on the trade was 32.80%.
What is Brian Richard Ostroff's role in Arianne Phosphate?
Brian Richard Ostroff's role in Arianne Phosphate is Head of Strategy.
How can I follow the stock ratings of top corporate insiders?
Head over to our Expert Center to see a list of the Top 100 corporate insiders and follow the corporate insiders of your choice. Visit their profiles for more details about their stock transactions and see how they perform on a stock-by-stock basis.