Free Trial

Compare Stocks

Compare stocks with our powerful stock comparison tool. Analyze fundamentals, price performance, and key financial indicators to make informed investment decisions. Our tool lets you compare up to ten stocks side by side based on Performance Charts, Price & Volume, MarketRank™, Analyst Ratings, Sales & Book Value, Profitability & Earnings, Dividends, Debt, Ownership, Headlines, and more. Simply enter up to ten stock symbols (e.g., BAC, JPM, WFC, C, GS) to get started and uncover top investment opportunities.

CompanyCurrent Price50-Day Moving Average52-Week RangeMarket CapBetaAvg. VolumeToday's Volume
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
$4.08
-0.7%
$3.96
$2.84
$5.38
$722.49M1.39485,568 shs474,407 shs
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
$6.71
+3.4%
$5.81
$4.25
$15.56
$746.90M0.093.41 million shs1.58 million shs
Sparton Co. stock logo
SPA
Sparton
$18.51
$18.51
$11.95
$19.77
$181.95M0.53121,970 shs26,459 shs
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
$0.01
$0.00
$2.88
$65K0.471.13 million shs100 shs
Analysts Agree—These Gold Picks Outshine the Rest Cover

Unlock the timeless value of gold with our exclusive 2025 Gold Forecasting Report. Explore why gold remains the ultimate investment for safeguarding wealth against inflation, economic shifts, and global uncertainties. Whether you're planning for future generations or seeking a reliable asset in turbulent times, this report is your essential guide to making informed decisions.

Get This Free Report

Compare Price Performance

Company1-Day Performance7-Day Performance30-Day Performance90-Day Performance1-Year Performance
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
0.00%+2.77%+13.33%+16.57%+19.65%
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
0.00%+9.64%+32.09%+44.61%-37.00%
Sparton Co. stock logo
SPA
Sparton
0.00%0.00%0.00%0.00%0.00%
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
0.00%-37.50%+400.00%-75.00%-26.47%
CompanyOverall ScoreAnalyst's OpinionShort Interest ScoreDividend StrengthESG ScoreNews and Social Media SentimentCompany OwnershipEarnings & Valuation
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
4.3224 of 5 stars
3.52.00.03.62.91.71.9
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
3.1073 of 5 stars
3.53.00.00.02.63.30.6
Sparton Co. stock logo
SPA
Sparton
N/AN/AN/AN/AN/AN/AN/AN/A
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
N/AN/AN/AN/AN/AN/AN/AN/A
CompanyConsensus Rating ScoreConsensus RatingConsensus Price Target% Upside from Current Price
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
3.00
Buy$6.0047.06% Upside
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
3.00
Buy$12.0078.84% Upside
Sparton Co. stock logo
SPA
Sparton
0.00
N/AN/AN/A
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
0.00
N/AN/AN/A

Current Analyst Ratings Breakdown

Latest SPA, TMPO, RBBN, and SGML Analyst Ratings

DateCompanyBrokerageActionRatingPrice TargetDetails
8/26/2025
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
Bank of America
Subscribe to MarketBeat All Access for the recommendation accuracy rating
Initiated CoverageBuy$12.00
8/21/2025
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
Cormark
Subscribe to MarketBeat All Access for the recommendation accuracy rating
UpgradeModerate Buy
7/24/2025
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
Rosenblatt Securities
Subscribe to MarketBeat All Access for the recommendation accuracy rating
Boost Price TargetBuy ➝ Buy$5.50 ➝ $6.00
(Data available from 9/1/2022 forward. View 10+ years of historical ratings with our analyst ratings screener.)
CompanyAnnual RevenuePrice/SalesCashflowPrice/CashBook ValuePrice/Book
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
$833.88M0.87$0.53 per share7.73$2.31 per share1.77
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
$152.36M4.90N/AN/A$0.87 per share7.71
Sparton Co. stock logo
SPA
Sparton
$374.99M0.49$2.90 per share6.38$7.67 per share2.41
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
$10.93M0.00N/AN/A($0.99) per share0.00
CompanyNet IncomeEPSTrailing P/E RatioForward P/E RatioP/E GrowthNet MarginsReturn on Equity (ROE)Return on Assets (ROA)Next Earnings Date
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
-$54.24M-$0.25N/A17.00N/A-5.14%7.08%2.41%10/22/2025 (Estimated)
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
-$51.07M-$0.44N/A6.85N/A-35.69%-47.19%-13.66%11/13/2025 (Estimated)
Sparton Co. stock logo
SPA
Sparton
-$8.25MN/A14.76N/A0.63%16.80%5.41%N/A
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
-$144.85MN/A0.00N/AN/AN/AN/A-428.46%N/A

Latest SPA, TMPO, RBBN, and SGML Earnings

DateQuarterCompanyConsensus EstimateReported EPSBeat/MissGap EPSRevenue EstimateActual RevenueDetails
8/14/2025Q2 2025
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
-$0.03-$0.17-$0.14-$0.17$50.44 million$16.89 million
7/23/2025Q2 2025
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
$0.05$0.05N/A-$0.06$213.31 million$220.58 million
CompanyAnnual PayoutDividend Yield3-Year Dividend GrowthPayout RatioYears of Consecutive Growth
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
N/AN/AN/AN/AN/A
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
N/AN/AN/AN/AN/A
Sparton Co. stock logo
SPA
Sparton
N/AN/AN/AN/AN/A
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
N/AN/AN/AN/AN/A
CompanyDebt-to-Equity RatioCurrent RatioQuick Ratio
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
0.88
1.38
1.13
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
1.26
0.60
0.39
Sparton Co. stock logo
SPA
Sparton
N/A
0.99
0.39
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
N/A
0.18
0.12

Institutional Ownership

CompanyInstitutional Ownership
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
70.92%
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
64.86%
Sparton Co. stock logo
SPA
Sparton
74.88%
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
35.04%

Insider Ownership

CompanyInsider Ownership
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
2.10%
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
48.60%
Sparton Co. stock logo
SPA
Sparton
3.37%
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
34.20%
CompanyEmployeesShares OutstandingFree FloatOptionable
Ribbon Communications Inc. stock logo
RBBN
Ribbon Communications
3,052177.08 million173.36 millionOptionable
Sigma Lithium Corporation stock logo
SGML
Sigma Lithium
250111.31 million57.21 millionOptionable
Sparton Co. stock logo
SPA
Sparton
1,5319.83 millionN/AOptionable
Tempo Automation Holdings, Inc. stock logo
TMPO
Tempo Automation
327.14 million17.86 millionOptionable

Recent News About These Companies

Understanding musical terms Tempo
Tempo Inti Media Tbk (TMPO)
Tempo Automation Holdings Inc - Ordinary Shares - Class A
14 Hot Penny Stocks On the Move
Tempo Automation Holdings Inc (TMPO)
Tempo Automation Reports 39% Revenue Drop
8-K: Tempo Automation Holdings, Inc.
Why Is Tempo Automation (TMPO) Stock Up 114% Today?

New MarketBeat Followers Over Time

Media Sentiment Over Time

Top Headlines

View All Headlines
Ribbon Communications stock logo

Ribbon Communications NASDAQ:RBBN

$4.08 -0.03 (-0.73%)
Closing price 08/29/2025 04:00 PM Eastern
Extended Trading
$4.09 +0.01 (+0.25%)
As of 08/29/2025 07:05 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more.

Ribbon Communications Inc. provides communications technology in the United States, Europe, the Middle East, Africa, the Asia Pacific, and internationally. It operates through two segments, Cloud and Edge, and IP Optical Networks. The Cloud and Edge segment provides software and hardware products, solutions, and services for voice over internet protocol communications, voice over long-term evolution, and voice over 5G communications, and unified communications and collaboration. It also offers session border controllers; and network transformation products, such as signaling products, call controllers, media gateways, and application servers. This segment serves private, public, or hybrid cloud infrastructures, as well as data centers, enterprise premises, and service provider networks. The IP Optical Networks segment provides hardware and software products and solutions for IP networking, switching, routing, and optical transport for technologies, such as 5G, distributed cloud computing, and corresponding applications. It also offers multiple solutions, including 5G-native solutions for mobile-backhaul, metro and edge aggregation, core networking, data center interconnect, multi-service access, and transport solutions for wholesale carriers. This segment serves utilities, government, defense, finance, transportation, and education and research industries, as well as service providers and enterprises. The company was formerly known as Sonus Networks, Inc. and changed its name to Ribbon Communications Inc. in November 2017. Ribbon Communications Inc. was founded in 1997 and is headquartered in Plano, Texas.

Sigma Lithium stock logo

Sigma Lithium NASDAQ:SGML

$6.71 +0.22 (+3.39%)
Closing price 08/29/2025 04:00 PM Eastern
Extended Trading
$6.71 0.00 (0.00%)
As of 08/29/2025 07:49 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more.

Sigma Lithium Corporation engages in the exploration and development of lithium deposits in Brazil. It holds a 100% interest in the Grota do Cirilo, Genipapo, Santa Clara, and São José properties comprising 29 mineral rights covering an area of approximately 185 square kilometers located in the Araçuaí and Itinga regions of the state of Minas Gerais, Brazil. It serves electric vehicle industries worldwide. The company was formerly known as Sigma Lithium Resources Corporation and changed its name to Sigma Lithium Corporation in July 2021. The company is headquartered in São Paulo, Brazil.

Sparton stock logo

Sparton NYSE:SPA

Sparton Corporation, together with its subsidiaries, provides design, development, and manufacturing services for electromechanical devices; and engineered products in electromechanical value stream worldwide. The company operates through two segments, Manufacturing & Design Services (MDS), and Engineered Components & Products (ECP). The MDS segment is involved in the contract design, manufacture, and aftermarket repair and refurbishment of printed circuit card assemblies, sub-assemblies, full product assemblies, and cable/wire harnesses, as well as development of embedded software and software quality assurance services in connection with medical devices and diagnostic equipment. This segment serves original equipment manufacturers and emerging technology customers serving the medical and biotechnology, military and aerospace, and industrial and commercial markets. The ECP segment designs, develops, and produces proprietary products for domestic and foreign defense, and commercial applications. It offers anti-submarine warfare devices for the U.S. Navy and foreign governments; rugged flat panel display systems for military panel PC workstations, air traffic control and industrial, and commercial marine applications; and high performance industrial grade computer systems and peripherals, as well as develops and markets commercial products for underwater acoustics and microelectromechanical based inertial measurement. This segment also performs an engineering development function for the United States military and prime defense contractors. Sparton Corporation was founded in 1900 and is headquartered in Schaumburg, Illinois.

Tempo Automation stock logo

Tempo Automation NASDAQ:TMPO

Tempo Automation Holdings, Inc. manufactures and sells electronic products. The company produces printed circuit board assemblies (PCBAs) for prototype and on-demand production markets; and turnkey PCBA services. It serves space, semiconductor, aviation and defense, and medical device, as well as industrials and e-commerce industries. Tempo Automation Holdings, Inc. was founded in 2013 and is headquartered in San Francisco, California. On December 8, 2023, Tempo Automation Holdings, Inc., along with its affiliate, filed a voluntary petition for liquidation under Chapter 7 in the U.S. Bankruptcy Court for the District of Delaware.