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Douglas M. JR Schafer

MIAX
EVP AND CIO · MIAMI INTERNATIONAL HOLDINGS, INC. · CIK 0002079445
FILING MIX · LIFETIME44%/56%
BUYS
14
SELLS
18
TOTAL VALUE
$15.61M
COMPANIES
1
ACTIVE SINCE
Aug 2025
HOLDINGS NOW
2,485
AVG SELL PX
$40.89
TRADE KIND
SHOWING 32 / 32
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
2 backtested trades · 8 horizons · 7 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Douglas M. JR Schafer, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d2+50.00%+4.71%+0.17%+4.54%+4.54%—
14d2+50.00%+6.48%+0.17%+6.31%+6.31%—
30d2+50.00%+6.23%+4.60%+8.03%+8.03%—
60d2+50.00%+15.55%+7.20%+8.36%+8.36%—
90d2(1 pending)+0.00%+8.71%+10.58%-1.86%-1.86%—
180d2(2 pending)——————
1y2(2 pending)——————
2y2(2 pending)——————
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
MIAX · 2,485 shares · as of Jun 16, 2026
0134,449268,898403,347537,7962026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2025
2025
2026
2026
FLOW · 14 buys / 18 sellsCOVERAGE · 4 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASEGRANT
Stock grant
21,481——21,481Jun 16, 2026Jun 18, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASEGRANT
Stock grant
23,298——387,414Jun 16, 2026Jun 18, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASEGRANT
Stock grant
2,485——2,485Jun 16, 2026Jun 18, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
32,565$40.79$1.33M364,116Jun 11, 2026Jun 12, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE10b5-1
10b5-1 plan
48,000$42.84$2.06M396,681Jun 2, 2026Jun 4, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
48,000$12.00$576.0K444,681Jun 2, 2026Jun 4, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
48,000——6,000Jun 2, 2026Jun 4, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
48,000$12.00$576.0K444,681May 4, 2026May 5, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE10b5-1
10b5-1 plan
48,000$47.25$2.27M396,681May 4, 2026May 5, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
48,000——54,000May 4, 2026May 5, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
48,000——102,000Mar 17, 2026Mar 18, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
48,000$12.00$576.0K444,681Mar 17, 2026Mar 18, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE10b5-1
10b5-1 plan
48,000$39.74$1.91M396,681Mar 17, 2026Mar 18, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
32,565$40.89$1.33M396,681Feb 18, 2026Feb 20, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
108,550$41.33$4.49M429,246Feb 10, 2026Feb 12, 2026 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
387,296——537,796Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
19,710——19,710Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
200,000——0Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
19,710——0Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
130,290——0Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
387,296——0Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
200,000——200,000Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
130,290——130,290Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
150,000——150,000Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
133,334——0Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
16,666——0Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
16,666——16,666Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
500——537,796Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
500——0Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
PURCHASE
EVP and CIO
133,334——133,334Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
150,000——0Aug 15, 2025Aug 19, 2025 ↗View →
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
SALE
EVP and CIO
21,710$23.00$499.3K387,296Aug 13, 2025Aug 15, 2025 ↗View →
Other insiders · MIAX
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About this filer
CIK 0002079445
ROLE
EVP and CIO
PRIMARY
MIAX
COMPANIES
1
ACTIVE SINCE
Aug 2025
MARKETPEEL · /INSIDER/0002079445DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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