Mainstream Capital Management’s Riot Platforms RIOT Stock Holding History

Mainstream Capital Management’s Portfolio RIOT Stock Details RIOT Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q3	$336K	Hold	16,666	–	–	0.2%	75
2026 Q2	$456K	Hold	16,666	–	–	0.27%	65
2026 Q1	$206K	Hold	16,666	–	–	0.14%	85
2025 Q4	$211K	Sell	16,666 -1,866	-10%	-$31.9K	0.14%	88
2025 Q3	$353K	Hold	18,532	–	–	0.23%	74
2025 Q2	$209K	Hold	18,532	–	–	0.15%	83
2025 Q1	$132K	Buy	+18,532	New	+$192K	0.1%	86

Other funds holding RIOT

Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return

Principal Financial Group Des Moines, Iowa $195B AUM 21.17% 1-Year Est. Return

IMC Chicago Chicago, Illinois $483B AUM 41.26% 1-Year Est. Return

BPIA

Broad Peak Investment Advisers Singapore $465M AUM 74.31% 1-Year Est. Return

Bank of New York Mellon New York $608B AUM 32.77% 1-Year Est. Return

BI Asset Management Fondsmaeglerselskab Kobenhavn, Denmark $13.1B AUM 35.37% 1-Year Est. Return

Axxion S.A. Grevenmacher, Luxembourg $1.52B AUM

Allspring Global Investments Charlotte, North Carolina $64.1B AUM 28.9% 1-Year Est. Return

Citigroup New York $308B AUM 40.94% 1-Year Est. Return

Assenagon Asset Management Senningerberg, Luxembourg $103B AUM 40.17% 1-Year Est. Return

Mainstream Capital Management's RIOT Position: Q3 2026 in Review

Mainstream Capital Management held its Riot Platforms (RIOT) position steady in Q3 2026 at 16,666 shares worth $336K. The position accounts for 0.2% of the portfolio, ranked #75.

Mainstream Capital Management first reported a position in RIOT in Q1 2025 and has held it in 7 quarters since. The position peaked at $456K in Q2 2026. 143 funds tracked by Wall St. Rank hold RIOT as of Q3 2026.

Mainstream Capital Management held 16,666 shares of Riot Platforms worth $336K as of Q3 2026.
Mainstream Capital Management left its Riot Platforms share count unchanged in Q3 2026.
Riot Platforms made up 0.2% of Mainstream Capital Management's portfolio in Q3 2026, its #75 holding.
Mainstream Capital Management first reported a position in Riot Platforms in Q1 2025 and has held it in 7 quarters since.
Mainstream Capital Management's Riot Platforms position peaked at $456K in Q2 2026.
143 funds tracked by Wall St. Rank held Riot Platforms as of Q3 2026.

Based on Mainstream Capital Management's 13F filing for Q3 2026, filed 23 Oct 2026.