Michael L Richter

Insider

First SEC filing: March 10, 2021 · Latest: March 10, 2021

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 6 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

6 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
March 8, 2021	CBOE	S	1,236	$105.10	$129,904	22,171 Direct	-5.28%	Disposed	195.0% (price as of 2026-08-26)
May 12, 2020	CBOE	A	1,482	—	—	23,407 Direct	+6.76%	Acquired	(price as of 2026-08-26)
Aug. 15, 2019	CBOE	S	2,600	$120.50	$313,300	21,925 Direct	-10.60%	Disposed	157.3% (price as of 2026-08-26)
May 16, 2019	CBOE	A	1,236	—	—	24,525 Direct	+5.31%	Acquired	(price as of 2026-08-26)
May 17, 2018	CBOE	A	1,108	—	—	23,289 Direct	+5.00%	Acquired	(price as of 2026-08-26)
May 18, 2017	CBOE	A	1,185	—	—	22,181 Direct	+5.64%	Acquired	(price as of 2026-08-26)
Feb. 28, 2017	CBOE	A	20,727	—	—	20,727 Direct	—	Acquired	(price as of 2026-08-26)
Feb. 28, 2017	CBOE	A	270	—	—	20,997 Direct	+1.30%	Acquired	(price as of 2026-08-26)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.