Figures computed from official regulatory filings — .
Ownershipinsiders 1.76% · institutions 0%
In USD · as of Oct 5, 2026
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South Dakota Soybean Processors, LLC owns and operates a soybean processing plant and a soybean oil refinery in the United States and Canada. It markets and sells soybean meal primarily to resellers, feed mills, and livestock producers as livestock feed; crude and soybean oil to the food, biodiesel, and chemical industries; and soybean hulls. In addition, the company provides contracting services for the construction and management of oilseed processing plants. The company was founded in 1993 and is based in Volga, South Dakota.
Market information source · Oct 5, 2026
Periods recorded in the consulted sources. These do not certify the legal dates of name changes.
SEC company identity · Oct 5, 2026
Open-market timeline · full history
123 buys17 sells— close pricebar = usd volume, √ scaleclick a period to filter the table
| Insider | Type | Value · USD | Signals | Details |
|---|---|---|---|---|
| CALAMOS JOHN P SRtrack record | Buy | $30K | conv 75 |
| SEC |
| CALAMOS JOHN P SRtrack record | Sell | $6.5K | SEC |
| CALAMOS JOHN P SRtrack record | Buy | $107.3K | conv 76Unusual size | SEC |
| CALAMOS JOHN P SRtrack record | Buy | $15K | conv 40 | SEC |
| CALAMOS JOHN P SRtrack record | Buy | $30K | conv 75First in 12mo | SEC |
| CALAMOS JOHN P SRtrack record | Buy | $125.8 | conv 29 | SEC |
| CALAMOS JOHN P SRtrack record | Buy | $94.1K | conv 83Unusual size | SEC |
| CALAMOS JOHN P SRtrack record | Buy | $30K | conv 75First in 12mo | SEC |
| Skinner Nedtrack record | Sell | $138.8K | Unusual size | SEC |
| Skinner Nedtrack record | Sell | $46.3K | SEC |
| Skinner Nedtrack record | Sell | $27.8K | SEC |
| Skinner Nedtrack record | Sell | $32.4K | SEC |
| Skinner Nedtrack record | Sell | $41.9K | SEC |
| Skinner Nedtrack record | Sell | $27.8K | SEC |
| Skinner Nedtrack record | Sell | $32.4K | SEC |
| Skinner Nedtrack record | Sell | $50.4K | SEC |
| Skinner Nedtrack record | Sell | $23.1K | SEC |
| Skinner Nedtrack record | Sell | $91.8K | SEC |
| Skinner Nedtrack record | Sell | $18.4K | SEC |
| Skinner Nedtrack record | Buy | $65.6K | conv 37Unusual size | SEC |
| NELSEN ROBERT E | Gift | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Skinner Nedtrack record | Buy | $3.9K | conv 16 | SEC |
| Reiner Michael | Buy | $15.5K | conv 47First in 12mo | SEC |
| Skinner Nedtrack record | Buy | $24.9K | conv 18 | SEC |
| KLEINJAN JONATHAN | Buy | $32.8K | conv 66ClusterFirst in 12mo | SEC |