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  • For 25 years, I’ve had Type 1 diabetes. Like the tens of millions of Americans with diabetes, one of the most important things I have to do to stay healthy is make sure my blood sugar is in normal range.

Continuous glucose monitors (CGMs) allow diabetics to track their blood sugar 24/7. They’re incredibly useful, providing insight on how your blood sugar reacts to insulin, food, exercise and whatever else affects it.

Abbott Laboratories and Dexcom are the leaders in the CGM market, which hit $5.1 billion in revenue in 2021 and is expected to reach $13.2 billion by 2028, according to Vantage Market Research. Abbott’s CGM systems, called FreeStyle Libre, generated $3.7 billion in revenue last year, with 4 million users globally.

Abbott has just released its newest CGM, the FreeStyle Libre 3. It comes with an important upgrade. Whereas the previous systems were “flash” CGMs, which means you had to hold your reader or phone close to the sensor to get a reading, the new version sends data straight to your phone.

I tried it out for over a month. Here are my takeaways:

How it works

The insertion device comes in a small box and is rather compact. The Libre 3 is only approved by the Food and Drug Administration to go into the arm. The insertion was painless, and the sensor itself is tiny compared to others I’ve used.

CNBC’s Erin Black tests new CGM Abbott Freestyle Libre 3

CNBC | Erin Black

The app requires a scan of the sensor, and then it takes 60 minutes to warm up. During the first 12 hours, a blood drop icon will appear.

Abbott Freestyle Libre 3 iPhone app

CNBC | Andrew Evers

Abbott says the sensor is acclimating. It also advises using a blood glucose meter to ensure the sensor is accurate. I found that it was accurate immediately, even while it was warming up.

Abbott Freestyle Libre 3

CNBC | Erin Black

The sensor stays on for 14 days. It gives a new reading every minute, compared to a reading every five minutes from the Dexcom G6. The adhesive worked well and showed no sign of falling off after two weeks. It still doesn’t require finger sticks or calibration.

Abbott Freestyle Libre 3 sensor

CNBC | Andrew Evers

The trend arrows tell you if your glucose is steady, rising or falling. The alarms are customizable. If you want to silence low and high alerts, you can use the app’s “do not disturb” function. The urgent low alarm can’t be silenced, as required by the FDA.

The app has some useful features for tracking average glucose and time in range and gives you the option to share the data with loved ones. It also has a reports feature that gives you insights into patterns so you can make dosage adjustments. 

The Libre 3 is small and accurate

I love how small it is, so small in fact that I kept forgetting I was wearing it. I put my Dexcom G6 nearby to compare. There’s a big difference.

Abbott Freestyle Libre 3 size vs Dexcom G6

CNBC | Erin Black

It was accurate most of the time. But I found that during times of rapid change, such as when I forgot to take my insulin after a meal, it became inaccurate and had a hard time keeping up.

I did have two compression lows with the first sensor. A compression low is when the sensor gives an incorrect low reading. One occurred while I was sleeping on my side, and the other was while I was sitting on the couch and leaning on the sensor. I readjusted, and the device quickly corrected itself. I made sure to choose a better placement for the second sensor.

The app can be improved

In the app, you can’t customize the graph size. It shows a range of 50 mg/dL to 350 mg/dl. I’d like the ability to adjust that so it’s a little tighter, because my blood sugar rarely goes above 250 mg/dl, so there’s a lot of wasted space.

There’s also no ability to zoom into past readings. Sometimes when I’m low I like to be able to zoom in and see how quickly the number is changing. And while it does send notifications to my iWatch, Abbott doesn’t yet have an app compatible to use with it, so seeing your blood sugar on your watch isn’t possible. Abbott says it’s something they’re working on for the future. 

Abbott Freestyle Libre 3 Apple iWatch notification

CNBC | Erin Black

Prescription required, price varies

The Libre 3 requires a prescription, so the cost will be different for everyone. Abbott said users with insurance can expect to pay $0-$25 per sensor and $70 per sensor without insurance. You’ll need to buy two a month.

Would I recommend this to other diabetics? Yes, but it depends on the user. For diabetics like me who use insulin pumps, the Libre 3 isn’t compatible yet. Abbott said it’s working on pump integration with Tandem Diabetes and Insulet. The company is also working with Bigfoot Biomedical on integration with its insulin delivery system.

For diabetics who rely on manual insulin injections or who diet to manage their diabetes, this is a great way to monitor blood sugar. 

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CNBC Daily Open: U.S. stocks retreat from highs as Broadcom leads tech sell-off

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CNBC Daily Open: U.S. stocks retreat from highs as Broadcom leads tech sell-off

Signage at the Broadcom Inc. headquarters in San Jose, California, U.S., on Monday, June 2, 2025.

David Paul Morris | Bloomberg | Getty Images

The sell-off in artificial intelligence stocks continued unabated Friday stateside. Broadcom shares tumbled more than 11% as investors grew concerned over lower margins and uncertain deals. Names such as Nvidia, Advanced Micro Devices and Oracle fell in sympathy, which caused major U.S. indexes to close lower.

It was a motif patterning the week. Even though the Dow Jones Industrial Average rose 1.1% week on week on the back of outperformance by financial stocks, tech names dragged down the S&P 500 and the Nasdaq Composite, which fell 0.6% and 1.6% respectively for the week.

That said, investors could have just been jittery amid the narrative of an apparent AI bubble, and were spooked by any sign of bad news. After all, Broadcom’s earnings — as well as its guidance for the current quarter — breezed past expectations.

“Frankly we aren’t sure what else one could desire as the company’s AI story continues to not only overdeliver but is doing it at an accelerating rate,” Bernstein analyst Stacy Rasgon, who has a “buy” rating on Broadcom, wrote in a Friday note.

Future prospects also look rosy, according to UBS. “We expect high profitability and the accelerating impact of the AI, power and resources, and longevity themes to drive 2026 performance,” said strategist Sagar Khandelwal.

But in the near term, investors may still be flighty, unless something concretely reassuring, such as Oracle achieving positive cash flow, reassures them the snapping sound is just a twig in the forest.

What you need to know today

U.S. stocks dragged down by AI names. Major indexes fell Friday, a day after they hit record highs. Asia-Pacific markets traded lower Monday. South Korea’s Kospi retreated roughly 1.5% as of 2:45 p.m. Singapore time (1:45 a.m. ET), leading losses in the region.

China’s economic slowdown deepens. Even though the country’s retail sales and industrial production grew year on year in November, their increase missed forecasts and slowed from the previous month. Investment in fixed assets in the January-to-November period contracted from a year earlier.

The end of the ‘Berkshire way’? Several aspects of Berkshire Hathaway’s leadership transition are signaling that the conglomerate is drifting away from the famously decentralized “Berkshire way,” CNBC’s Alex Crippen writes.

Hong Kong court finds Jimmy Lai guilty. The 78-year-old pro-democracy activist and media baron was ruled guilty of sedition and collusion with foreign countries by a Hong Kong court on Monday. The results might unsettle foreign investors, analysts say.

[PRO] China’s food security strategy. The spat between Beijing and Washington over soybean purchases has highlighted the evolution of China’s domestic agriculture industry. Goldman Sachs thinks this is the best way to play the sector.

And finally…

Copper prices have soared this year, hitting multiple record highs, fueled by supply disruptions and fears over U.S. tariffs.

Imagebroker/sunny Celeste | Imagebroker | Getty Images

Copper could hit ‘stratospheric new highs’ as hoarding of the metal in U.S. continues

Copper prices have hit multiple record highs this year, fueled by supply disruptions and as fears over U.S. tariffs have led to a surge in demand. The rally is set to continue into 2026.

Citi analysts expect prices of the red metal to skyrocket on the back of stronger demand led by the energy transition and artificial intelligence sectors. Electrification, grid expansion and data-center build-outs require large amounts of the metal for wiring, power transmission and cooling infrastructure.

— Lee Ying Shan

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CNBC Daily Open: Investors sell off tech despite steady Broadcom numbers

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CNBC Daily Open: Investors sell off tech despite steady Broadcom numbers

Signage at the Broadcom Inc. headquarters in San Jose, California, U.S., on Monday, June 2, 2025.

David Paul Morris | Bloomberg | Getty Images

The sell-off in artificial intelligence stocks continued unabated Friday stateside. Broadcom shares tumbled more than 11% as investors grew concerned over lower margins and uncertain deals. Names such as Nvidia, Advanced Micro Devices and Oracle fell in sympathy, which caused major U.S. indexes to close lower.

It was a motif patterning the week. Even though the Dow Jones Industrial Average rose 1.1% week on week on the back of outperformance by financial stocks, tech names dragged down the S&P 500 and the Nasdaq Composite, which fell 0.6% and 1.6% respectively for the week.

That said, investors could have just been jittery amid the narrative of an apparent AI bubble, and were spooked by any sign of bad news. After all, Broadcom’s earnings — as well as its guidance for the current quarter — breezed past expectations.

“Frankly we aren’t sure what else one could desire as the company’s AI story continues to not only overdeliver but is doing it at an accelerating rate,” Bernstein analyst Stacy Rasgon, who has a “buy” rating on Broadcom, wrote in a Friday note.

Future prospects also look rosy, according to UBS. “We expect high profitability and the accelerating impact of the AI, power and resources, and longevity themes to drive 2026 performance,” said strategist Sagar Khandelwal.

But in the near term, investors may still be flighty, unless something concretely reassuring, such as Oracle achieving positive cash flow, reassures them the snapping sound is just a twig in the forest.

What you need to know today

U.S. stocks dragged down by AI names. Major indexes fell Friday, a day after they hit record highs. The pan-European Stoxx 600 retreated almost 0.5%. Separately, the U.K. economy unexpectedly shrank 0.1% in the three months to October.

Oracle will finish data centers on time. The company issued its response to a Bloomberg report, which cited unnamed people, that Oracle will complete data centers for OpenAI in 2028 rather than 2027. “There have been no delays,” Oracle said.

Coinbase to have an in-house prediction market. It will be powered be Kalshi, a source close to the matter told CNBC, and is a play to expand asset classes available on the cryptocurrency exchange.

The end of the ‘Berkshire way’? Several aspects of Berkshire Hathaway’s leadership transition are signaling that the conglomerate is drifting away from the famously decentralized “Berkshire way,” CNBC’s Alex Crippen writes.

[PRO] China’s food security strategy. The spate between Beijing and Washington over soybean purchases has highlighted the evolution of China’s domestic agriculture industry. Goldman Sachs thinks this is the best way to play the sector.

And finally…

A bear statue stands outside the Frankfurt Stock Exchange, operated by Deutsche Boerse AG, in Frankfurt, Germany, on Friday, March 13, 2020. Top European CEOs are fearing a euro zone recession as a confluence of economic shocks continues to threaten the outlook for the bloc.

Alex Kraus | Bloomberg | Getty Images

Global week ahead: Europe under fire

U.S. President Donald Trump’s verdict on Europe: a “decaying” group of nations led by “weak” people. His criticism in a recent Politico interview adds to a tough period for the bloc, with challenges on multiple fronts testing European leaders in the final weeks of the year.

This week looks set to be critical, with a high-stakes summit in Brussels and the European Central Bank’s final policy meeting of the year. Key topics for this week include defrosting frozen Russian assets for Ukraine aid; EU vs. U.S. in trade and tech, and updated economic figures at the ECB meeting.

Leonie Kidd

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Broadcom and Costco’s rich valuations leave little room for error as battleground stocks

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Broadcom and Costco's rich valuations leave little room for error as battleground stocks

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