Dow rises 110 pts as Treasury buybacks lower yields and Moderna stock surges

• Treasury buyback program targeting longer-term debt reversed recent yield increases, with the 30-year yield falling from a 19-year high of 5.33%, supporting rate-sensitive stocks like Lowe's (+3%) and Home Depot (+2%)
• Moderna's positive cancer vaccine trial results drove massive gains and lifted other healthcare names including Novavax and BioNTech, making healthcare the S&P 500's biggest sector contributor
• Tech stocks showed mixed performance as Broadcom and AMD fell 4% following disappointing OpenAI revenue results, while Marvell gained 9% on an expanded Google partnership involving custom AI chips worth up to $12.2 billion

Market Summary: Dow Rises on Treasury Buyback Program, Moderna Surges

Market Performance:

US equities closed higher on Wednesday, with the Dow Jones gaining 119.71 points (+0.22%), while the S&P 500 and Nasdaq advanced 0.22% and 0.16%, respectively. Gains moderated from session highs, where the Dow had climbed over 300 points earlier in the day.

Treasury Buyback Impact:

The US Treasury announced it would at least double its debt buyback operations targeting 10-30 year maturities, including 20-year bonds. This drove yields sharply lower, with the 30-year Treasury yield falling 9 basis points to 5.195% (from a 19-year high of 5.33%) and the 10-year yield declining 5+ basis points to 4.653%. Rate-sensitive stocks benefited, with Lowe's gaining 3% and Home Depot rising over 2%.

Moderna's Breakthrough:

Moderna surged 176% after announcing positive late-stage trial results for its personalized mRNA cancer treatment developed with Merck. The treatment successfully reduced melanoma recurrence and prevented cancer spread. The rally lifted related healthcare stocks including Novavax and BioNTech, pushing the S&P 500 healthcare sector to a record high.

Technology Sector Mixed:

Marvell Technology jumped 9% on an expanded partnership with Google involving custom AI chips and a $12.2 billion warrant issuance to Alphabet. However, Broadcom and AMD fell approximately 4% following disappointing Q2 results from OpenAI, where revenue increased 18% quarter-over-quarter but losses widened.

Market Outlook:

Despite the positive close, investor caution persists. Fed minutes revealed several policymakers favored rate increases at the July meeting, maintaining rates at 3.5-3.75%. The retreat from session highs signals ongoing concerns about the longer-term interest rate trajectory and inflation risks.