TapewireFind a company

person · Reporting owner

Herndon Mark

Disclosed activity across 2 companies

Tapewire entity
21439
SEC CIK
0001754318

Export transaction history ↓

Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
Horizon Kinetics Holding CorpHKHC · Entity 1286Chief Financial OfficerAugust 19, 2026August 20, 2026
SAFEGUARD SCIENTIFICS INCSFE · Entity 9612SVP & Chief Financial OfficerJanuary 17, 2023January 19, 2023

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

Horizon Kinetics Holding Corp

Report date August 19, 2026 · Filed August 20, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect550 Ending reported balance After 2026-08-20 transaction · row 2
2 source rows · reconciled sequence

Row 1 · 2026-08-19 · Purchase · Acquired 50 · Balance 350

Row 2 · 2026-08-20 · Purchase · Acquired 200 · Balance 550

SAFEGUARD SCIENTIFICS INC

Report date January 17, 2023 · Filed January 19, 2023

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
common stockSEC Table I · non-derivativeDirect57,469 Ending reported balance After 2023-01-17 transaction · row 2
2 source rows · reconciled sequence

Row 1 · 2023-01-17 · Grant · Acquired 26,835 · Balance 70,625

Row 2 · 2023-01-17 · Tax withholding · Disposed 13,156 · Balance 57,469

Transaction history

JSON API
Reset

Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
August 20, 2026 Filed Aug 20, 2026 18:08 UTC Horizon Kinetics Holding Corp HKHC · Entity 1286 PurchaseCommon Stock 200 $26.75 $5,350.00
Disclosure

SEC source: 0001437749-26-028621 · rdgdoc.xml · nonDerivative · entry 2

Herndon Mark · CIK 0001754318 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 550

Read SEC document
August 19, 2026 Filed Aug 20, 2026 18:08 UTC Horizon Kinetics Holding Corp HKHC · Entity 1286 PurchaseCommon Stock 50 $26.50 $1,325.00
Disclosure

SEC source: 0001437749-26-028621 · rdgdoc.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 350

Read SEC document
May 20, 2026 Filed May 21, 2026 15:04 UTC Horizon Kinetics Holding Corp HKHC · Entity 1286 PurchaseCommon Stock 100 $27.85 $2,785.00
Disclosure

SEC source: 0001437749-26-018006 · rdgdoc.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 300

Read SEC document
March 18, 2026 Filed Mar 19, 2026 16:31 UTC Horizon Kinetics Holding Corp HKHC · Entity 1286 PurchaseCommon Stock 80 $33.03 $2,642.40
Disclosure

SEC source: 0001437749-26-008985 · rdgdoc.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 200

Read SEC document
November 20, 2025 Filed Nov 21, 2025 16:39 UTC Horizon Kinetics Holding Corp HKHC · Entity 1286 PurchaseCommon Stock 100 $29.00 $2,900.00
Disclosure

SEC source: 0001437749-25-035929 · rdgdoc.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120

Read SEC document
June 04, 2025 Filed Jun 5, 2025 16:03 UTC Horizon Kinetics Holding Corp HKHC · Entity 1286 PurchaseCommon Stock 20 $40.18 $803.60
Disclosure

SEC source: 0001437749-25-019487 · rdgdoc.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20

Read SEC document
January 17, 2023 Filed Jan 19, 2023 14:51 UTC SAFEGUARD SCIENTIFICS INC SFE · Entity 9612 Tax withholdingcommon stock 13,156 $3.13 $41,112.50
Disclosure

SEC source: 0001437749-23-001288 · rdgdoc.xml · nonDerivative · entry 2

Herndon Mark · CIK 0001754318 · SVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 57,469

Read SEC document
January 17, 2023 Filed Jan 19, 2023 14:51 UTC SAFEGUARD SCIENTIFICS INC SFE · Entity 9612 Grantcommon stock 26,835 $0.00 $0.00
Disclosure

SEC source: 0001437749-23-001288 · rdgdoc.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · SVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,625

Read SEC document
January 17, 2022 Filed Jan 18, 2022 21:21 UTC SAFEGUARD SCIENTIFICS INC SFE · Entity 9612 Tax withholdingCommon Stock 5,348 $7.10 $37,970.80
Disclosure

SEC source: 0001437749-22-001098 · rdgdoc.xml · nonDerivative · entry 2

Herndon Mark · CIK 0001754318 · SVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,790

Read SEC document
January 17, 2022 Filed Jan 18, 2022 21:21 UTC SAFEGUARD SCIENTIFICS INC SFE · Entity 9612 GrantCommon Stock 11,526 $0.00 $0.00
Disclosure

SEC source: 0001437749-22-001098 · rdgdoc.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · SVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,138

Read SEC document
January 20, 2021 Filed Jan 21, 2021 20:02 UTC SAFEGUARD SCIENTIFICS INC SFE · Entity 9612 Tax withholdingCommon Stock 3,711 $6.57 $24,399.08
Disclosure

SEC source: 0001437749-21-000997 · rdgdoc.xml · nonDerivative · entry 2

Herndon Mark · CIK 0001754318 · SVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,612

Read SEC document
January 20, 2021 Filed Jan 21, 2021 20:02 UTC SAFEGUARD SCIENTIFICS INC SFE · Entity 9612 GrantCommon Stock 11,323 $0.00 $0.00
Disclosure

SEC source: 0001437749-21-000997 · rdgdoc.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · SVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,323

Read SEC document
May 06, 2020 Filed May 7, 2020 14:19 UTC SAFEGUARD SCIENTIFICS INC SFE · Entity 9612 PurchaseCommon Stock 2,000 $6.25 $12,500.00
Disclosure

SEC source: 0001437749-20-009729 · rdgdoc.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · SVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,000

Read SEC document
December 07, 2018 Filed Dec 10, 2018 17:23 UTC SAFEGUARD SCIENTIFICS INC SFE · Entity 9612 PurchaseCommon Stock 10,000 $9.44 $94,400.00
Disclosure

SEC source: 0000086115-18-000089 · wf-form4_154446259143531.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · SVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,000

F1 · price: The purchase price reported is the average purchase price paid for the shares. The shares were purchased at prices ranging from $9.41 to $9.50. Reporting person will provide, upon the request of the SEC staff, the issuer or its shareowners, full information regarding the number of shares purchased or sold at each separate price.

Read SEC document
October 23, 2018 Filed Oct 25, 2018 18:24 UTC SAFEGUARD SCIENTIFICS INC SFE · Entity 9612 GrantCommon Stock 18,000 $0.00 $0.00
Disclosure

SEC source: 0000086115-18-000084 · wf-form4_154049183194528.xml · nonDerivative · entry 1

Herndon Mark · CIK 0001754318 · SVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,000

Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.