MarketPeel
Insider Trading Intelligence
Pricing
…
DD

D. Mark Dewalch

BSM
DIRECTOR · BLACK STONE MINERALS, L.P. · CIK 0001638259
FILING MIX · LIFETIME100%/0%
BUYS
26
SELLS
0
TOTAL VALUE
$3.53M
COMPANIES
1
ACTIVE SINCE
Jan 2020
HOLDINGS NOW
432,837
AVG SELL PX
—
TRADE KIND
SHOWING 26 / 26
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
6 backtested trades · 8 horizons · 1 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by D. Mark Dewalch, 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
7d6+50.00%-3.01%-0.93%-2.08%-1.61%—
14d6+50.00%-1.88%+0.11%-1.98%-1.28%—
30d6+33.33%-1.91%+2.91%-4.81%-2.04%—
60d6+33.33%-1.66%+3.87%-5.53%-3.92%—
90d6+66.67%-2.05%+8.04%-10.10%-4.55%—
180d6+50.00%+0.65%+13.69%-13.04%-11.08%—
1y6+0.00%-8.12%+25.76%-33.88%-31.65%—
2y6(1 pending)+0.00%-12.28%+47.69%-59.97%-55.92%—
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
BSM · 432,837 shares · as of Jul 2, 2026
0157,812315,624473,436631,248202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
2026
FLOW · 26 buys / 0 sellsCOVERAGE · 27 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
1,342$13.97$18.7K432,837Jul 2, 2026Jul 2, 2026 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASE
36,363$13.62$495.3K631,248Jun 1, 2026Jun 2, 2026 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASE
36,363$13.48$490.0K594,885May 29, 2026Jun 2, 2026 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASE
37,650$13.21$497.3K431,495May 28, 2026May 28, 2026 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
1,240$15.12$18.7K393,845Apr 2, 2026Apr 6, 2026 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
14,255——392,605Jan 13, 2026Jan 15, 2026 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
1,410$13.29$18.7K378,350Jan 2, 2026Jan 6, 2026 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
1,426$13.14$18.7K376,940Oct 3, 2025Oct 7, 2025 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
1,433$13.08$18.7K375,514Jul 3, 2025Jul 3, 2025 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
1,227$15.27$18.7K374,081Apr 4, 2025Apr 7, 2025 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
13,324——372,854Jan 13, 2025Jan 15, 2025 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
1,284$14.60$18.7K359,530Jan 3, 2025Jan 7, 2025 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
1,241$15.10$18.7K358,246Oct 4, 2024Oct 8, 2024 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASE
34,200$14.62$500.0K357,005Aug 15, 2024Aug 15, 2024 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
1,196$15.67$18.7K322,805Jul 5, 2024Jul 8, 2024 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
1,173$15.98$18.7K321,609Apr 5, 2024Apr 9, 2024 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASE
3,250$15.47$50.3K320,436Feb 26, 2024Feb 27, 2024 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
12,307——317,186Jan 11, 2024Jan 16, 2024 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASE
22,297$17.49$390.0K304,879Nov 17, 2023Nov 17, 2023 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASE
21,703$17.14$372.0K282,582Nov 16, 2023Nov 17, 2023 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASE
3,100$15.85$49.1K13,417Mar 6, 2023Mar 7, 2023 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASE
31,150$15.85$493.7K260,879Mar 6, 2023Mar 7, 2023 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
12,539——229,729Jan 11, 2023Jan 13, 2023 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
14,115——217,190Jan 11, 2022Jan 11, 2022 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
15,414——203,075Jan 12, 2021Jan 13, 2021 ↗View →
BSM
BLACK STONE MINERALS, L.P.
PURCHASEGRANT
Stock grant
13,389——187,661Jan 13, 2020Jan 15, 2020 ↗View →
Other insiders · BSM
Loading peer insiders…
About this filer
CIK 0001638259
ROLE
Director
PRIMARY
BSM
COMPANIES
1
ACTIVE SINCE
Jan 2020
MARKETPEEL · /INSIDER/0001638259DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

The morning brief, before the bell.

One short email. Insider buys, congressional trades, and plain-English analysis.

Feedback