May 2026: 0.93% (D+ grade)

Maine inventionINDEX May 2026: 0.93% (D+ grade)

The inventionINDEX measures innovation output by comparing GDP growth with patent production growth. 

Anything over C grade is positive sentiment; anything under C is negative outlook/sentiment. Using that sentiment, it is possible to observe trends over time, and also compare states/countries. In doing so, we can predict which states have the best chance to recover economically from the pandemic (or any other economic incident that may occur).

Maine inventionINDEX Scores – Last 12 months

The latest recording for the Maine inventionINDEX in May 2026 sits at 0.93%, receiving a D+ rating. This figure represents a notable recovery from the immediate preceding month of April 2026, where the index plummeted to 0.71% with a failing grade of F. While this short-term bounce offers a temporary reprieve, a broader look at the timeline reveals that the May 2026 score represents an exact alignment with the historical average of approximately 0.93% computed over the last 60 months. This stabilization follows a fluctuating trajectory observed in the first quarter of 2026, which started at a moderate 0.99% in January and peaked at 1.10% in February before experiencing consecutive declines.

Examining the extensive 60-month historical data reveals a cyclical and highly volatile environment for innovation metrics. Over this multi-year span, the index peaked spectacularly in March 2024 at 1.78%, earning an A+ rating, which followed another impressive performance of 1.50% in October 2023. Conversely, the baseline historical low stands at 0.65%, a trough reached in May 2021, November 2021, February 2023, and September 2023. A frequency analysis of the historical ratings demonstrates that a D+ rating is the most common outcome, occurring 20 times, while an F rating manifests 13 times. This indicates that while the index is capable of sharp, high-performing spikes, it spends the vast majority of its time fluctuating within the lower-tier scoring brackets.

Achieving a higher grade on the inventionINDEX yields substantial positive economic and structural outcomes for the region. High scores, such as the A and B ranges observed during mid-2025 and early 2024, signify robust intellectual property development, increased patent filings, and a thriving entrepreneurial ecosystem. When the index rises, it reflects a surge in research and development efficiency, which in turn acts as a magnet for venture capital, federal grants, and corporate investments. An elevated index score boosts regional competitiveness, fosters high-wage job creation in technological fields, and signals to the broader market that the area is a fertile ground for commercial innovation.

In contrast, lower grades carry severe negative implications for the long-term health of the innovation economy. When the index drops to levels like the 0.71% seen in April 2026 or the historical lows of 0.65%, it signals systemic stagnation, underfunded research initiatives, or a bottleneck in transferring ideas from the laboratory to the marketplace. Persistent low ratings can lead to a loss of competitive advantage, causing talented innovators and researchers to migrate to more supportive ecosystems. Furthermore, depressed scores discourage risk-tolerant capital from investing locally, creating a restrictive cycle where a lack of funding leads to fewer inventions, thereby cementing low scores and stalling broader economic growth. The stabilization in May 2026 to 0.93% halts the immediate downward spiral, but it emphasizes the critical need for strategic interventions to elevate the index toward its historical peaks.

Discussion:

In May, the Maine inventionINDEX scored a negative sentiment which was lower than the previous year’s average but outperformed the downward trend for the year. This is in contrast to the prior 12 months, which experienced a slight upward trend. 

As the economy continues to stabilize in the post-pandemic era, it remains uncertain whether any backlog of applications still exists or if the department has returned to normal processing timelines. The inventionINDEX could also be affected by lingering consequences from the pandemic, such as company closures, reduced workforces, and limited R&D capabilities, which may still be impacting current operations.

Learn More:

Are you thinking of patenting any of your bright ideas? Did you know your research work could be eligible for the R&D Tax Credit and you can receive up to 14% back on your expenses? To find out more, please check out our free online eligibility test.

Swanson Reed’s Maine office provides R&D tax credit consulting and advisory services to Portland, Lewiston, Bangor, South Portland and Auburn.

Feel free to book a quick teleconference with one of R&D tax specialists if you would like to learn more about R&D tax credit opportunities.

Who We Are:

Swanson Reed is the largest Specialist R&D tax credit advisory firm in the United States. With offices nationwide, we are one of the only firms globally to exclusively provide R&D tax credit consulting services to our clients. We have been exclusively providing R&D tax credit claim preparation and audit compliance solutions for over 30 years. 

Swanson Reed hosts daily free webinars and provides free IRS CE and CPE credits for CPAs.  For more information please visit us at www.swansonreed.com/free-webinars or contact your usual Swanson Reed representative.