---
title: "S1 CORP /DE/ — Ownership Dossier"
canonical: https://whiteintel.dev/entity/d3dae5e4-1703-5276-a4dd-8039efe882fa
json: https://whiteintel.dev/api/public/dossier/d3dae5e4-1703-5276-a4dd-8039efe882fa
identifier: sec:0001063254
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# S1 CORP /DE/

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001063254`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/d3dae5e4-1703-5276-a4dd-8039efe882fa  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/d3dae5e4-1703-5276-a4dd-8039efe882fa  

## Ownership & control

### Owners / controllers

- **DREYER JOHANN** (officer) — https://whiteintel.dev/entity/b8fe16df-908e-5b73-8c19-1021eba3358e
- **STONE JOHN A** (officer) — https://whiteintel.dev/entity/34cc01c8-61f2-53eb-b5d5-f7b79c685022
- **SPIEGEL JOHN W** (director) — https://whiteintel.dev/entity/a66c38d6-8735-5cc7-9d85-ca558737f71f
- **IVESTER M DOUGLAS** (director) — https://whiteintel.dev/entity/adc521e8-c718-5735-893b-39edfec30e64
- **VAN SCHOOR FRANCOIS** (officer) — https://whiteintel.dev/entity/e3e7cbd2-2b9e-5367-87c8-1c2df60f7341
- **JOHNSON THOMAS P JR** (director) — https://whiteintel.dev/entity/7254bd6d-1655-5f28-a24f-e64efe0915bb
- **DREYER JOHANN** (director) — https://whiteintel.dev/entity/b8fe16df-908e-5b73-8c19-1021eba3358e
- **GUPTA RAM** (director) — https://whiteintel.dev/entity/dc8736e9-b230-5257-b7d0-e41395e8b36d
- **PARRISH PAUL** (officer) — https://whiteintel.dev/entity/eef869c8-3706-5375-964a-d43df111af06
- **TERINO EDWARD** (director) — https://whiteintel.dev/entity/2e734928-9cae-560a-be4a-1bedc862dbc4
- **Naude Pierre** (officer) — https://whiteintel.dev/entity/186b1c76-4010-5f0f-a0b7-2c56c8897220
- **KRUGER JAN** (officer) — https://whiteintel.dev/entity/2aa37ad4-7099-539a-a416-08c7b3e71347
- **OWENS GREGORY J** (director) — https://whiteintel.dev/entity/eeacf037-3cfa-5e7b-8e6b-c690fc76f772
- **Orenstein Gregory** (officer) — https://whiteintel.dev/entity/0164fac1-0eb2-5613-a76b-f3b65d9b8235
- **PUTNAM MEIGAN** (officer) — https://whiteintel.dev/entity/b1057212-c7a3-59c6-94b6-0648cfe300c3
- **DEXTER STEPHEN M** (officer) — https://whiteintel.dev/entity/88f3e84e-b369-52eb-b409-44fbab1debbd
- **UNDERWOOD NEIL LAWRENCE** (officer) — https://whiteintel.dev/entity/8784e07f-0bda-5960-be63-dfc213a8c120
- **STARK MORGAN B** (tenpercentowner) — https://whiteintel.dev/entity/79b5cc43-0361-5f38-bcd6-6c8b6a2354a6
- **PARCHE, LLC** (tenpercentowner) — https://whiteintel.dev/entity/7d082259-76a6-5a24-b40b-dda01f967f55
- **COHEN PETER A** (tenpercentowner) — https://whiteintel.dev/entity/dafba410-2bd1-5372-9bb1-b036a18fef57
- **RAMIUS FUND III LTD** (tenpercentowner) — https://whiteintel.dev/entity/d1afd445-c3cd-5a66-8611-8187c4b06a1d
- **RAMIUS ADVISORS LLC** (tenpercentowner) — https://whiteintel.dev/entity/1acd3717-c56c-5b12-bc84-d99b17c8b1f7
- **RAMIUS LEVERAGED MULTI-STRATEGY MASTER FUND LTD** (tenpercentowner) — https://whiteintel.dev/entity/2a260287-0e1d-5884-9e94-f8f6d53371a7
- **RAMIUS ENTERPRISE MASTER FUND LTD** (tenpercentowner) — https://whiteintel.dev/entity/cfed4ad4-8d7f-5af1-b2d9-29d80ebe9c6a
- **RAMIUS VALUE & OPPORTUNITY MASTER FUND LTD** (tenpercentowner) — https://whiteintel.dev/entity/8efa8909-0711-598c-a3e7-736e8badb854
- **RAMIUS MERGER ARBITRAGE MASTER FUND LTD** (tenpercentowner) — https://whiteintel.dev/entity/1a01d7ca-3714-5728-9382-b1bc60c64529
- **RAMIUS MASTER FUND LTD** (tenpercentowner) — https://whiteintel.dev/entity/b8315ac2-538d-5cef-8c4d-3c9c95d7530b
- **STRAUSS THOMAS W** (tenpercentowner) — https://whiteintel.dev/entity/c08de495-16a0-5257-b8d9-8f150af1a178
- **C4S & CO LLC** (tenpercentowner) — https://whiteintel.dev/entity/68553497-6c58-5194-a4b1-1b42bbabef5d
- **ADMIRAL ADVISORS, LLC** (tenpercentowner) — https://whiteintel.dev/entity/418a85b3-5e7d-5407-931a-556494dcca90
- **RAMIUS CAPITAL GROUP LLC** (tenpercentowner) — https://whiteintel.dev/entity/e665d3bd-e5bf-5da9-9a77-e0caf0bed304
- **SOLOMON JEFFREY M** (tenpercentowner) — https://whiteintel.dev/entity/df387172-666a-5782-8705-2a8293f33d16
- **Smith Jeffrey C** (director) — https://whiteintel.dev/entity/42d7d981-7412-50e3-8c2c-2d4fe7a80f4a
- **STARBOARD VALUE & OPPORTUNITY FUND, LLC** (tenpercentowner) — https://whiteintel.dev/entity/71537b62-037f-502e-9dd0-68eb92089b86

### UBO chain (walk to the ultimate owner)

A **34-step** ownership/control chain to the ultimate beneficial owner is resolved for this entity. The full cited chain unlocks with a paid API key or a one-off dossier — https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **S1 CORP /DE/**. Human view: https://whiteintel.dev/entity/d3dae5e4-1703-5276-a4dd-8039efe882fa · Structured JSON: https://whiteintel.dev/api/public/dossier/d3dae5e4-1703-5276-a4dd-8039efe882fa._

_Risk levels are heuristic investigative leads, not legal determinations of beneficial ownership. Every claim carries a source; an absent edge means "not yet observed in current sources", not "does not exist"._