SunDensity Inc

Boston, MA · Founded 2016 · Energy · Private

Multi-layered nano-optical coatings using photonic crystals and plasmonic resonance structures to improve light conversion efficiency in solar cells and opto-electronic devices

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Updated Oct 23, 2026 · sundensity.net

Sector: Energy
Headquarters: Boston, MA
Founded: 2016
Latest Form D: $165K, Jan 2022
Total capital: $14M

Federal grants: $1.2M; 2 awards · 2020–2021; Rank in peer group#37 of 53
Private capital raised: $12.8M; 3 Form D · last Jan 2022; 57 months since last filing
Federal contracts: None on recordNo federal contract awards found.
Granted patents: 3; 4 pending · first 2021; Rank in peer group#10 of 53

Capital timeline

Latest events

Jan 2022Private capital raisedForm D · SEC · 3rd filing$165K
Oct 2021Private capital raisedForm D · SEC · 2nd filing$10.6M
Sep 2021Federal grantNSF · Phase II · SBIR Phase II: Advanced Manufacturing of Smart Coatings for Utility-Scale Photovoltaic Applications and Solar Cells$999K
Jul 2020Private capital raisedForm D · SEC · 1st filing$1.9M
May 2020Federal grantNSF · Phase I · SBIR Phase I: Advanced Manufacturing of Photonic Smart Coatings for Utility-Scale PV Applications$225K

Node area is scaled to amount. Form D reports securities sold, which can differ from an announced round; filings are numbered in the order they were made.

Federal first

2months

from SunDensity Inc’s first federal award to its first private round.

First federal award · May 2020: NSF · $225K
First Form D · Jul 2020: $1.9M · 1st Form D
Awards before first raise: 1 award

An association in public records, not a cause or a prediction.

Standing among 53 peers

Line = median

Energy · Material

Federal grantsBelow median
Granted patents#10 · top 19%

Cumulative measures favor older companies. Rankings describe position today, not outcome. Below the median, ranks show as a band rather than a number.

Founders and team

Researcher links verified by same-company patents and grants

NISHIKANT SONWALKARResearcherExecutive Officer, Director, PromoterLinked by 3 patents · $1.2M in grants as PI
KEDAR TEMPLE WITHERS GUPTADirectorNamed in SEC Form D filings
SHEFALI TEMPLE WITHERS PATELExecutive Officer, DirectorNamed in SEC Form D filings
SUJATHA TEMPLE WITHERS RAMANUJANDirectorNamed in SEC Form D filings
THURMAN J. RODGERSDirectorNamed in SEC Form D filings
William Temple Withers Fennell, Jr.DirectorNamed in SEC Form D filings

What it has protected

USPTO · 3 granted of 7

Mar 14, 2024PendingSystem And Method For Plasmonic Spectral Conversion Using Nano-holes And Nano-disksUSPTOApplication 18463452
Dec 26, 2023GrantedMetal Nanoparticle Fabrication On Tco For Plasmonic Interaction Of PhotonsUSPTOUS 11,851,743
Sep 5, 2023GrantedMethod And Apparatus For Increased Solar Energy ConversionUSPTOUS 11,750,150

Show all 7 patent records

System And Method For Plasmonic Spectral Conversion Using Nano-holes And Nano-disksMar 14, 2024 · Application 18463452Pending
Metal Nanoparticle Fabrication On Tco For Plasmonic Interaction Of PhotonsDec 26, 2023 · US 11,851,743Granted
Method And Apparatus For Increased Solar Energy ConversionSep 5, 2023 · US 11,750,150Granted
Optical Coating For Spectral ConversionMar 2, 2021 · US 10,935,707Granted
Method And Apparatus For Increased Solar Energy ConversionApplication PCTUS2020054596Pending
Metal Nanoparticle Fabrication On Tco For Plasmonic Interaction Of PhotonsApplication PCTUS2023030119Pending
Optical Coating For Spectral ConversionApplication PCTUS2020054586Pending

MICROSILICON INCSimilar federal contract value in Energy · null in contracts
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NU PLANET PHARMACEUTICAL RADIOISOTOPES, INC.Similar federal contract value in Energy · null in contracts
Elektroda, LLCSimilar federal contract value in Energy · null in contracts
UNDERGROUND SYSTEMS INCSimilar federal contract value in Energy · null in contracts

Regulatory activity · Energy

Sector-level, not company-level

09 Jul 2026Air Plan Approval; Michigan; Redesignation and Maintenance Plan for the Partial St. Clair 2010 1-Hour Sulfur Dioxide (SO2) NAAQS Nonattainment AreaEnvironmental Protection Agency
02 Jul 2026Air Plan Approval; Delaware; 2006 24-Hour Fine Particulate Matter Limited Maintenance Plan for the Philadelphia Nonattainment AreaEnvironmental Protection Agency
02 Jul 2026Air Plan Approval; Oklahoma; Updates to the State Implementation Plan for New Source Review Permitting and General SIP ProvisionsEnvironmental Protection Agency
01 Jul 2026List of Approved Spent Fuel Storage Casks: NAC International, Inc., MAGNASTOR® Storage System, Certificate of Compliance No. 1031, Amendment Nos. 16 and 17 and Revisions to Amendment Nos. 0 Through 16Nuclear Regulatory Commission
30 Jun 2026Epyrifenacil; Pesticide TolerancesEnvironmental Protection Agency
30 Jun 2026Fluoxapiprolin; Pesticide TolerancesEnvironmental Protection Agency

Rules are matched to sector, not to company. Recent activity in a sector is context rather than a signal about this business — until rules are matched to what a company actually builds, the section is shown as context and nothing more.

Sources

Federal grants from SBIR/STTR, NIH, NSF and DoD records. Federal contracts from USAspending.gov. Private capital from SEC Form D. Patents from USPTO. Publications from OpenAlex. Regulatory activity from the Federal Register. Press matched on company name.

How to read this page

Figures show associations in public records, not causes or predictions. Nothing here is investment advice. An em-dash means no record was found under this company's name, not that none exists.

Data freshness

SEC Form D filings through Oct 23, 2026. SBIR and STTR awards through Oct 21, 2026.