Question 1

How many shares of MGNI does SIMPLEX TRADING, LLC own?

Accepted Answer

SIMPLEX TRADING, LLC previously held 0 shares of MGNI (MAGNITE INC) before exiting the position in 2026-Q2.

Question 2

What is SIMPLEX TRADING, LLC's MGNI position worth?

Accepted Answer

SIMPLEX TRADING, LLC's MGNI position was last reported at $0 in 2026-Q2 before the exit.

Question 3

Is SIMPLEX TRADING, LLC buying or selling MGNI?

Accepted Answer

In 2026-Q2, SIMPLEX TRADING, LLC exited their MGNI position entirely (-100.0% change in shares).

Question 4

When did SIMPLEX TRADING, LLC first buy MGNI?

Accepted Answer

Based on available 13F filings, SIMPLEX TRADING, LLC first reported a position in MGNI in 2024-Q3. They have held the position across 21 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Exited	0	-100.0%	$0	0.0%	$18.98	0
2026-Q1	Decreased	11,316	-95.7%	$134,434	0.0%	$13.77	0
2025-Q4	Increased	263,362	+125.0%	$4.3M	0.0%	$16.46	43
2025-Q3	Increased	117,045	+121.5%	$2.5M	0.0%	$22.28	42
2025-Q2	New	52,834	—	$1.3M	0.0%	$21.10	35
2025-Q1	Exited	0	-100.0%	$0	0.0%	$11.60	0
2024-Q4	Decreased	31,987	-63.7%	$509,000	0.0%	$16.41	0
2024-Q3	Increased	88,159	+1071.7%	$1.2M	0.0%	$13.72	41