HKHC insider buying and SEC filings, explained
Horizon Kinetics Holding Corp · CIK 88000
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$112K
Insiders who bought
2
Sold (not marked 10b5-1)
$0
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Sep 18, 2026 | Purchase (code P) | Allison Nagelberg (Director) bought 190 shares at $26.27 ($5K), reported as a purchase (code P). Holdings up 48% to 590 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 22, 2026 |
| Sep 2, 2026 | Purchase (code P) | Alice C Brennan (Director) bought 200 shares at $25.92 ($5K), reported as a purchase (code P). Holdings up 11% to 2,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 3, 2026 |
| Aug 28, 2026 | Purchase (code P) | Alice C Brennan (Director) bought 200 shares at $26.20 ($5K), reported as a purchase (code P). Holdings up 13% to 1,800 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 31, 2026 |
| Aug 27, 2026 | Purchase (code P) | Alice C Brennan (Director) bought 200 shares at $26.00 ($5K), reported as a purchase (code P). Holdings up 14% to 1,600 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 28, 2026 |
| Aug 26, 2026 | Purchase (code P) | Daniel J Roller (Director and Affiliate) bought 500 shares at $26.50 ($13K), reported as a purchase (code P). Holdings up 5% to 10,000 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 3 other reporting owners. | SEC filing Filed Aug 27, 2026 |
| Aug 25, 2026 | Purchase (code P) | Alice C Brennan (Director) bought 200 shares at $26.75 ($5K), reported as a purchase (code P). Holdings up 17% to 1,400 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 26, 2026 |
| Aug 24, 2026 | Purchase (code P) | Alice C Brennan (Director) bought 200 shares at $26.87 ($5K), reported as a purchase (code P). Holdings up 20% to 1,200 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 25, 2026 |
| Aug 24, 2026 | Purchase (code P) | Brent D Rosenthal (Director) bought 2,000 shares at $27.00 ($54K), reported as a purchase (code P). Holdings up 82% to 4,450 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 25, 2026 |
| Aug 19–20, 2026 | Purchase (code P) | Mark Herndon (CFO) bought 250 shares between Aug 19 and Aug 20 at about $26.70 ($7K), reported as a purchase (code P). Holdings up 83% to 550 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 20, 2026 |
| May 20, 2026 | Purchase (code P) | Mark Herndon (CFO) bought 100 shares at $27.85 ($3K), reported as a purchase (code P). Holdings up 50% to 300 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 21, 2026 |
| May 20, 2026 | Purchase (code P) | Brent D Rosenthal (Director) bought 700 shares at $27.85 ($19K), reported as a purchase (code P). Holdings up 40% to 2,450 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 21, 2026 |
| Mar 20, 2026 | Purchase (code P) Amended filing | Murray Stahl (CEO and Director) bought 53 shares directly and indirectly (by entity) at $34.60 ($2K), reported as a purchase (code P). Direct holdings up <1% to 249,204 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. This amends a filing from Mar 24. | SEC filing Filed Mar 24, 2026 |
| Mar 20, 2026 | Purchase (code P) | Allison Nagelberg (Director) bought 150 shares at $33.96 ($5K), reported as a purchase (code P). Holdings up 60% to 400 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 23, 2026 |
| Mar 19, 2026 | Purchase (code P) | Murray Stahl (CEO and Director) bought 89 shares directly and indirectly (by entity) at $34.06 ($3K), reported as a purchase (code P). Direct holdings up <1% to 249,194 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Mar 20, 2026 |
| Mar 18, 2026 | Purchase (code P) | Murray Stahl (CEO and Director) bought 27 shares directly and indirectly (by entity) at $34.00 ($918), reported as a purchase (code P). Direct holdings up <1% to 249,148 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Mar 19, 2026 |
| Mar 18, 2026 | Purchase (code P) | Mark Herndon (CFO) bought 80 shares at $33.03 ($3K), reported as a purchase (code P). Holdings up 67% to 200 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 19, 2026 |
| Mar 18, 2026 | Purchase (code P) | Brent D Rosenthal (Director) bought 750 shares at $33.05 ($25K), reported as a purchase (code P). Holdings up 75% to 1,750 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 19, 2026 |
| Dec 10, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 22 shares directly and indirectly (by entity) at $27.00 ($594), reported as a purchase (code P). Direct holdings up <1% to 249,138 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Dec 11, 2025 |
| Dec 9, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 22 shares directly and indirectly (by entity) at $27.00 ($594), reported as a purchase (code P). Direct holdings up <1% to 249,126 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Dec 10, 2025 |
| Dec 8, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 22 shares directly and indirectly (by entity) at $26.73 ($588), reported as a purchase (code P). Direct holdings up <1% to 249,114 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Dec 9, 2025 |
| Dec 5, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 22 shares directly and indirectly (by entity) at $27.75 ($611), reported as a purchase (code P). Direct holdings up <1% to 249,102 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Dec 8, 2025 |
| Dec 4, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 22 shares directly and indirectly (by entity) at $27.75 ($611), reported as a purchase (code P). Direct holdings up <1% to 249,090 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Dec 5, 2025 |
| Dec 3, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 22 shares directly and indirectly (by entity) at $27.00 ($594), reported as a purchase (code P). Direct holdings up <1% to 249,078 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Dec 4, 2025 |
| Dec 2, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 22 shares directly and indirectly (by entity) at $27.23 ($599), reported as a purchase (code P). Direct holdings up <1% to 249,066 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Dec 3, 2025 |
| Dec 1, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 22 shares directly and indirectly (by entity) at $27.00 ($594), reported as a purchase (code P). Direct holdings up <1% to 249,054 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Dec 2, 2025 |
| Nov 28, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 22 shares directly and indirectly (by entity) at $27.23 ($599), reported as a purchase (code P). Direct holdings up <1% to 249,042 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Dec 1, 2025 |
| Nov 26, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 24 shares directly and indirectly (by entity) at $27.23 ($654), reported as a purchase (code P). Direct holdings up <1% to 249,030 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Nov 28, 2025 |
| Nov 25, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 24 shares directly and indirectly (by entity) at $27.00 ($648), reported as a purchase (code P). Direct holdings up <1% to 249,018 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Nov 26, 2025 |
| Nov 25, 2025 | Purchase (code P) | Brent D Rosenthal (Director) bought 300 shares at $27.28 ($8K), reported as a purchase (code P). Holdings up 43% to 1,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 26, 2025 |
| Nov 24, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 24 shares directly and indirectly (by entity) at $28.00 ($672), reported as a purchase (code P). Direct holdings up <1% to 249,006 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Nov 25, 2025 |
| Nov 21, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 25 shares directly and indirectly (by entity) at $28.25 ($706), reported as a purchase (code P). Direct holdings up <1% to 248,994 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Nov 24, 2025 |
| Nov 20, 2025 | Purchase (code P) | Murray Stahl (CEO and Director) bought 24 shares directly and indirectly (by entity) at $27.50 ($660), reported as a purchase (code P). Direct holdings up <1% to 248,982 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Nov 21, 2025 |
| Nov 20, 2025 | Purchase (code P) | Mark Herndon (CFO) bought 100 shares at $29.00 ($3K), reported as a purchase (code P). Holdings up 500% to 120 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 21, 2025 |
1 routine transaction (such as a grant, option exercise or tax withholding) is not listed.
Cluster buys
2 insiders bought in 30 days
$67K in purchases since Aug 24, 2026 · Purchases traded Aug 24, 2026 to Aug 26, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Brent D Rosenthal (Director) | $54K | Aug 24, 2026 | SEC filing |
| Daniel J Roller (Director) | $13K | Aug 26, 2026 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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