Miami International Holdings, Inc. (MIAX) Insider Trading

Last 12 months

Insiders bought $723k and sold $76.6M on the open market.

97% of the selling was scheduled in advance under 10b5-1 plans. Director Murray Stahl sold $2.19M on Mar 2 outside a plan.

Net open-market

−$75.8M

3 buys · 58 sales

Under a 10b5-1 plan

97%

of the value sold

Insiders who bought / sold

1 / 11

executives and directors

Last open-market buy

Mar 2026

Mar 5, 2026

Get an email when MIAX's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Oct 2	Douglas M. Schafer Jr EVP and CIO	Sold10b5-1 plan	40,000	$33.34	$1.33M	9.4%	Form 4
Sep 16	Shelly Brown EVP, Chief Strategy Officer	Sold10b5-1 plan	21,217	$38.61	$819k	6.3%	Form 4
Sep 3	Edward Deitzel EVP, CRO, CCO MIAX Exchanges	Sold10b5-1 plan	11,000	$42.21	$464k	8.4%	Form 4
Sep 3	Thomas P. Gallagher Chairman & CEO	Sold10b5-1 plan	47,000	$42.43	$1.99M	2.1%	Form 4
Sep 2	Barbara J. Comly EVP, GC & Corporate Secretary	Sold10b5-1 plan	44,445	$40.49	$1.8M	5.0%	Form 4
Sep 2	Douglas M. Schafer Jr EVP and CIO	Sold10b5-1 plan	48,000	$40.48	$1.94M	11%	Form 4
Sep 2	Judson Gray Teekell Director	Sold10b5-1 plan 2 parts	8,545	$41.34 average	$353k	5.4%	Form 4
Aug 19	Thomas P. Gallagher Chairman & CEO	Sold10b5-1 plan	149,700	$41.13	$6.16M	9.5%	Form 4
Aug 17	Cynthia Schwarzkopf Director	Sold10b5-1 plan	5,000	$42.85	$214k	5.3%	Form 4
Aug 17	Lance Emmons EVP and CFO	Sold10b5-1 plan	35,000	$42.83	$1.5M	29%	Form 4
Aug 4	Barbara J. Comly EVP, GC & Corporate Secretary	Sold10b5-1 plan	44,445	$45.69	$2.03M	4.8%	Form 4
Aug 4	Kurt M. Eckert Director	Sold10b5-1 plan	1,063	$45.80	$49k	0.7%	Form 4
Aug 4	Edward Deitzel EVP, CRO, CCO MIAX Exchanges	Sold10b5-1 plan	11,000	$45.78	$504k	8.4%	Form 4
Aug 4	Harish Jayabalan EVP, CISO and CRO	Sold10b5-1 plan	20,000	$45.90	$918k	20%	Form 4
Aug 4	Thomas P. Gallagher Chairman & CEO	Sold10b5-1 plan	48,334	$45.69	$2.21M	2.7%	Form 4
Aug 4	Douglas M. Schafer Jr EVP and CIO	Sold10b5-1 plan	48,000	$45.71	$2.19M	11%	Form 4
Aug 4	Judson Gray Teekell Director	Sold10b5-1 plan	3,000	$45.79	$137k	4.0%	Form 4
Jul 15	Cynthia Schwarzkopf Director	Sold10b5-1 plan	5,000	$42.00	$210k	5.3%	Form 4
Jul 13	Barbara J. Comly EVP, GC & Corporate Secretary	Sold10b5-1 plan	28,000	$41.98	$1.18M	3.1%	Form 4
Jul 13	Thomas P. Gallagher Chairman & CEO	Sold10b5-1 plan	70,000	$42.52	$2.98M	3.9%	Form 4
Jul 6 – 7	Thomas P. Gallagher Chairman & CEO	Sold10b5-1 plan 2 parts	70,000	$42.16 average	$2.95M	3.9%	Form 4
Jul 6	Harish Jayabalan EVP, CISO and CRO	Sold10b5-1 plan	20,000	$42.12	$842k	20%	Form 4
Jul 6	Edward Deitzel EVP, CRO, CCO MIAX Exchanges	Sold10b5-1 plan	11,000	$42.04	$462k	8.4%	Form 4
Jul 6	Shelly Brown EVP, Chief Strategy Officer	Sold10b5-1 plan	16,000	$42.13	$674k	4.3%	Form 4
Jul 2	Judson Gray Teekell Director	Sold10b5-1 plan	3,000	$40.00	$120k	3.8%	Form 4
Jul 2	Kurt M. Eckert Director	Sold10b5-1 plan	5,250	$39.35	$207k	3.4%	Form 4
Jul 2	Barbara J. Comly EVP, GC & Corporate Secretary	Sold10b5-1 plan	28,000	$41.22	$1.15M	3.1%	Form 4
Jul 2	Douglas M. Schafer Jr EVP and CIO	Sold10b5-1 plan	48,000	$41.22	$1.98M	11%	Form 4
Jun 15	Shelly Brown EVP, Chief Strategy Officer	Sold10b5-1 plan	4,714	$44.23	$209k	1.5%	Form 4
Jun 11	Cynthia Schwarzkopf Director	Sold10b5-1 plan	19,500	$41.73	$814k	19%	Form 4
Jun 8 – 9	Harish Jayabalan EVP, CISO and CRO	Sold10b5-1 plan 2 parts	20,000	$40.08 average	$802k	21%	Form 4
Jun 2	Barbara J. Comly EVP, GC & Corporate Secretary	Sold10b5-1 plan	28,000	$42.85	$1.2M	3.2%	Form 4
Jun 2	Kurt M. Eckert Director	Sold10b5-1 plan	5,250	$42.76	$224k	3.6%	Form 4
Jun 2	Edward Deitzel EVP, CRO, CCO MIAX Exchanges	Sold10b5-1 plan	11,000	$42.16	$464k	8.6%	Form 4
Jun 2	Shelly Brown EVP, Chief Strategy Officer	Sold10b5-1 plan	16,000	$42.12	$674k	4.7%	Form 4
Jun 2	Thomas P. Gallagher Chairman & CEO	Sold10b5-1 plan	70,000	$42.36	$2.97M	3.9%	Form 4
Jun 2	Douglas M. Schafer Jr EVP and CIO	Sold10b5-1 plan	48,000	$42.84	$2.06M	11%	Form 4
Jun 2	Judson Gray Teekell Director	Sold10b5-1 plan	3,000	$42.78	$128k	4.1%	Form 4
May 15	Lance Emmons EVP and CFO	Sold10b5-1 plan	35,000	$56.36	$1.97M	29%	Form 4
May 5	Thomas P. Gallagher Chairman & CEO	Sold10b5-1 plan	15,771	$47.92	$756k	0.9%	Form 4

Oct 210b5-1 plan
Douglas M. Schafer Jr
EVP and CIO · sold 40,000 at $33.34
$1.33M
9.4% of stake
Sep 1610b5-1 plan
Shelly Brown
EVP, Chief Strategy Officer · sold 21,217 at $38.61
$819k
6.3% of stake
Sep 310b5-1 plan
Edward Deitzel
EVP, CRO, CCO MIAX Exchanges · sold 11,000 at $42.21
$464k
8.4% of stake
Sep 310b5-1 plan
Thomas P. Gallagher
Chairman & CEO · sold 47,000 at $42.43
$1.99M
2.1% of stake
Sep 210b5-1 plan
Barbara J. Comly
EVP, GC & Corporate Secretary · sold 44,445 at $40.49
$1.8M
5.0% of stake
Sep 210b5-1 plan
Douglas M. Schafer Jr
EVP and CIO · sold 48,000 at $40.48
$1.94M
11% of stake
Sep 210b5-1 plan
Judson Gray Teekell
Director · sold 8,545 at avg $41.34
$353k
5.4% of stake
Aug 1910b5-1 plan
Thomas P. Gallagher
Chairman & CEO · sold 149,700 at $41.13
$6.16M
9.5% of stake
Aug 1710b5-1 plan
Cynthia Schwarzkopf
Director · sold 5,000 at $42.85
$214k
5.3% of stake
Aug 1710b5-1 plan
Lance Emmons
EVP and CFO · sold 35,000 at $42.83
$1.5M
29% of stake
Aug 410b5-1 plan
Barbara J. Comly
EVP, GC & Corporate Secretary · sold 44,445 at $45.69
$2.03M
4.8% of stake
Aug 410b5-1 plan
Kurt M. Eckert
Director · sold 1,063 at $45.80
$49k
0.7% of stake
Aug 410b5-1 plan
Edward Deitzel
EVP, CRO, CCO MIAX Exchanges · sold 11,000 at $45.78
$504k
8.4% of stake
Aug 410b5-1 plan
Harish Jayabalan
EVP, CISO and CRO · sold 20,000 at $45.90
$918k
20% of stake
Aug 410b5-1 plan
Thomas P. Gallagher
Chairman & CEO · sold 48,334 at $45.69
$2.21M
2.7% of stake
Aug 410b5-1 plan
Douglas M. Schafer Jr
EVP and CIO · sold 48,000 at $45.71
$2.19M
11% of stake
Aug 410b5-1 plan
Judson Gray Teekell
Director · sold 3,000 at $45.79
$137k
4.0% of stake
Jul 1510b5-1 plan
Cynthia Schwarzkopf
Director · sold 5,000 at $42.00
$210k
5.3% of stake
Jul 1310b5-1 plan
Barbara J. Comly
EVP, GC & Corporate Secretary · sold 28,000 at $41.98
$1.18M
3.1% of stake
Jul 1310b5-1 plan
Thomas P. Gallagher
Chairman & CEO · sold 70,000 at $42.52
$2.98M
3.9% of stake
Jul 6 – 710b5-1 plan
Thomas P. Gallagher
Chairman & CEO · sold 70,000 at avg $42.16
$2.95M
3.9% of stake
Jul 610b5-1 plan
Harish Jayabalan
EVP, CISO and CRO · sold 20,000 at $42.12
$842k
20% of stake
Jul 610b5-1 plan
Edward Deitzel
EVP, CRO, CCO MIAX Exchanges · sold 11,000 at $42.04
$462k
8.4% of stake
Jul 610b5-1 plan
Shelly Brown
EVP, Chief Strategy Officer · sold 16,000 at $42.13
$674k
4.3% of stake
Jul 210b5-1 plan
Judson Gray Teekell
Director · sold 3,000 at $40.00
$120k
3.8% of stake
Jul 210b5-1 plan
Kurt M. Eckert
Director · sold 5,250 at $39.35
$207k
3.4% of stake
Jul 210b5-1 plan
Barbara J. Comly
EVP, GC & Corporate Secretary · sold 28,000 at $41.22
$1.15M
3.1% of stake
Jul 210b5-1 plan
Douglas M. Schafer Jr
EVP and CIO · sold 48,000 at $41.22
$1.98M
11% of stake
Jun 1510b5-1 plan
Shelly Brown
EVP, Chief Strategy Officer · sold 4,714 at $44.23
$209k
1.5% of stake
Jun 1110b5-1 plan
Cynthia Schwarzkopf
Director · sold 19,500 at $41.73
$814k
19% of stake
Jun 8 – 910b5-1 plan
Harish Jayabalan
EVP, CISO and CRO · sold 20,000 at avg $40.08
$802k
21% of stake
Jun 210b5-1 plan
Barbara J. Comly
EVP, GC & Corporate Secretary · sold 28,000 at $42.85
$1.2M
3.2% of stake
Jun 210b5-1 plan
Kurt M. Eckert
Director · sold 5,250 at $42.76
$224k
3.6% of stake
Jun 210b5-1 plan
Edward Deitzel
EVP, CRO, CCO MIAX Exchanges · sold 11,000 at $42.16
$464k
8.6% of stake
Jun 210b5-1 plan
Shelly Brown
EVP, Chief Strategy Officer · sold 16,000 at $42.12
$674k
4.7% of stake
Jun 210b5-1 plan
Thomas P. Gallagher
Chairman & CEO · sold 70,000 at $42.36
$2.97M
3.9% of stake
Jun 210b5-1 plan
Douglas M. Schafer Jr
EVP and CIO · sold 48,000 at $42.84
$2.06M
11% of stake
Jun 210b5-1 plan
Judson Gray Teekell
Director · sold 3,000 at $42.78
$128k
4.1% of stake
May 1510b5-1 plan
Lance Emmons
EVP and CFO · sold 35,000 at $56.36
$1.97M
29% of stake
May 510b5-1 plan
Thomas P. Gallagher
Chairman & CEO · sold 15,771 at $47.92
$756k
0.9% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch MIAX, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in MIAX's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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