Potomac Affinity Proteins, LLC
Potomac Affinity Proteins, LLC is a small business in North Potomac, MD registered on SAM.gov to bid on federal contracts. It has won about $109,998 in federal prime contracts since fiscal year 2024, according to USAspending.gov's award records for its UEI.
- UEI
- MD3PXLK9TCM6
- CAGE code
- 4GM56
- SAM.gov registration
- Active
SBIR and STTR awards
Potomac Affinity Proteins, LLC has won 4 small business R&D awards worth $2.4 million through the SBIR and STTR programs since 2016, 2 of them Phase II. Funded by NIH.
| Awarded | Agency | Project | Amount |
|---|---|---|---|
| May 1, 2021 | NIH | SBIR Phase I Selection system for identifying protein-specific folding tags that enable purification of native… | $224,806 |
| Jul 1, 2019 | NIH | SBIR Phase II Fast, flexible, and economical system for affinity-tag protein purification and tag removal | $1.5 million |
| Apr 5, 2018 | NIH | SBIR Phase I Fast, flexible, and economical system for affinity-tag protein purification and tag removal | $224,994 |
| Jul 1, 2016 | NIH | SBIR Phase II Protease chain reactions for molecular analysis of cancer markers | $494,911 |
Award data from SBIR.gov. SBIR and STTR awards are grants or contracts for R&D, so some don't appear in its federal contract history.
Federal contract history
| Fiscal year | Obligated, prime contracts |
|---|---|
| FY2025 | $109,998 |
These are every prime contract USAspending.gov records under UEI MD3PXLK9TCM6, from its award search. For a company that is part of a parent company, USAspending's recipient page can show a different figure for a year, because it counts the company's own record and its parent's record separately.
Its biggest federal customers since fiscal year 2024: Defense Health Agency ($109,998).
Recent contract awards
New contracts, by the date each was first signed. Orders and changes to older contracts count in the yearly totals above but aren't listed here, and Defense awards appear 90 days after signing.
| Awarded | Agency | What it's for | Obligated |
|---|---|---|---|
| Jul 9, 2025 | Defense Health Agency | Research and development services | $109,998 |
Figures are prime contract obligations reported to USAspending.gov. Work done as a subcontractor isn't included.
Registration details
Show registration details
From SAM.gov's monthly public file dated Nov 1, 2026. If the business has updated its registration since, SAM.gov shows the newer details.
| Legal business name | Potomac Affinity Proteins, LLC |
|---|---|
| Unique Entity ID (UEI) | MD3PXLK9TCM6 |
| CAGE code | 4GM56 |
| Location | North Potomac, MD |
| SAM.gov registration | Active through May 2, 2027 |
| Business started | 2005 |
| Primary NAICS code | 541714: Research and Development in Biotechnology (except Nanobiotechnology) |
| Website | www.potomac-affinity-proteins.com |
| How to contact | Through its website above. No phone or email in SAM.gov's public file. Search UEI MD3PXLK9TCM6 in SBA's Small Business Search for a contact the business added. |
Certifications and business types
No SBA certification (8(a), HUBZone or WOSB) in SAM.gov's public file (Nov 1, 2026).
SBA certifications let a business compete for set-aside contracts (set-asides explained). Check the current record on its SAM.gov entry.
How to check or correct this record
The file sometimes leaves a certification out, and a newer one won't be in it yet.
Check or correct this record at the source: open its SAM.gov entry, or search UEI MD3PXLK9TCM6 () in SAM.gov's entity search (free sign-in) and in SBA's Small Business Search (formerly DSBS), which shows SBA certifications. The business can update its details in its SAM.gov registration and its certifications at certifications.sba.gov.
NAICS codes Potomac Affinity Proteins, LLC is small under
On its SAM.gov registration, Potomac Affinity Proteins, LLC meets the SBA size standard for these industries, so it can bid on small business set-asides that use them.
- 541714 Research and Development in Biotechnology (except Nanobiotechnology)
Open contracts in Potomac Affinity Proteins, LLC's NAICS codes
30 open federal opportunities on SAM.gov use one of Potomac Affinity Proteins, LLC's NAICS codes and may be open to it: no set-aside, or, in the code it is registered small under, a small business set-aside. Here are a few, those in its primary code first, then those in Maryland, then the soonest due.
- Quantitative Analysis of Longitudinal MR Images
✦ Sources sought notice 75N98027R00005: the National Institutes of Health, for the National Institute on Aging (NIA), asks firms to show they can process and measure 300 new brain…
Due in 2 daysNov 9, 2026, 9:00 AM EST
- RFI Lupus Research Program (LRP) Public
✦ The Defense Health Agency, for the Congressionally Directed Medical Research Programs (CDMRP) Lupus Research Program, is asking the public for input on possible future lupus…
Due in 9 daysNov 16, 2026, 4:00 PM EST
- RFI Alzheimer’s Research Program (AZRP) Public
✦ The Defense Health Agency's Congressionally Directed Medical Research Programs (CDMRP) is asking for public feedback to shape the fiscal year 2027 (FY27) Alzheimer’s Research…
Due in 27 daysDec 4, 2026, 4:00 PM EST
- Traumatic Brain Injury and Psychological Health Research Program Public Request for Information
✦ The Defense Health Agency's Congressionally Directed Medical Research Programs (CDMRP) wants public feedback to shape the fiscal year 2027 (FY27) Traumatic Brain Injury and…
Due in 34 daysDec 11, 2026, 4:00 PM EST
- Service request for specimen embedding and sectioning.
Due in 2 daysNov 9, 2026, 1:00 PM CST
Similar small businesses
Other small businesses of a similar size with the same primary NAICS code (541714) that have won federal contracts in Maryland:
- Reprocell U.S.A., Inc., Beltsville, MD
- Integrated Biotherapeutics, LLC, Rockville, MD
- Arraystar Inc, Rockville, MD
- Intralytix Inc, Columbia, MD
- Biaera Technologies LLC, Hagerstown, MD
- Nelson Scientific Labs LLC, Potomac, MD
Is this your business? Get a reminder before the SAM.gov registration expires
Get a reminder before the SAM.gov registration expires. It's active through May 2, 2027. We'll email you 60, 30 and 7 days ahead, and if it lapses.
Frequently asked questions
What is Potomac Affinity Proteins, LLC's CAGE code?
Potomac Affinity Proteins, LLC's CAGE code is 4GM56. The Defense Logistics Agency assigns CAGE codes when a business registers on SAM.gov.
What is Potomac Affinity Proteins, LLC's UEI?
Potomac Affinity Proteins, LLC's Unique Entity ID (UEI) is MD3PXLK9TCM6. SAM.gov assigns the UEI, and it identifies the business across the federal government.
Is Potomac Affinity Proteins, LLC's SAM.gov registration active?
Yes, as of SAM.gov's public data from Nov 1, 2026, Potomac Affinity Proteins, LLC's registration is active through May 2, 2027. Registrations are renewed every year.
Is Potomac Affinity Proteins, LLC a small business?
Potomac Affinity Proteins, LLC is registered on SAM.gov as small under 1 NAICS code, including its primary code, 541714. Size is set per NAICS code, so a business can be small for some contracts and not others.
Keep going
- Look up another business's CAGE code or UEI
- Check a SAM.gov registration's status
- How to become a government subcontractor
- Hiring subcontractors? List small businesses by state, NAICS code and certification
Registration details come from SAM.gov's public entity extract and contract figures from USAspending.gov. Contact names and street addresses are left out. To change these details, update the registration on SAM.gov. To report a mistake on this page, or to ask us to remove it, email hello@fedready.us with the page address; we reply within 2 business days. For a removal, write from an address at the company.