ARKG jumps 7.8% as genomics leads a narrow rebound
Thursday, September 17, 2026: The ARK Genomic Revolution ETF rose 7.8%. The S&P 500 gained 1.1% to 7,637. Generac climbed 18% on an Amazon generator agreement.
Key takeaways
A day after the Federal Reserve raised its federal-funds target a quarter point to 3.75%–4.00% on a 12–0 vote, ARK Genomic Revolution ETF ARKG jumped 7.8%, as Tempus AI rose 15% and Schrödinger 26%.
The S&P 500 rose 1.1%. Equal-weight S&P 500 fund RSP gained 0.5%. The financials sector fund XLF slipped 0.1%. The Russell 2000 added 0.6%.
The 10-year Treasury yield ended at 4.94%, down 6 basis points. iShares 20+ Year Treasury Bond ETF TLT rose 1.1%. The CBOE Volatility Index fell 13% to 15.44.
ARKG gained 7.8%, more than four times QQQ
Tempus, Schrödinger, and ARKG's 7.8%
The genomics fund closed at $51.59 after tagging a 52-week high of $52.09. About 8.6 million shares changed hands, more than twice recent daily volume. It is up 19% over one month and 78% year to date. This was a continuation, not a turn.
Tempus AI, an 8.5% weight, contributed 1.3 percentage points, the most of any holding, after CEO Eric Lefkofsky on Tuesday told Morgan Stanley's healthcare conference that reimbursement and test-pricing changes would lift revenue. Twist Bioscience added 0.8 points following Wednesday's agreement to supply antibody data to Eli Lilly's TuneLab platform. Schrödinger, a drug-discovery software name, contributed 0.7 points and printed a 52-week high of $30.41, a move that arrived without an operational update from the company. Absci rose 15%. Those four names accounted for 3.4 percentage points of the fund's gain.
Generac's Amazon contract
Generac Holdings rose 18% to $207.23, after trading as high as $233.18. A Wednesday 8-K said Amazon will take backup generators for its data centers, with initial deliveries expected to total $2.4 billion in 2027 and 2028. Warrant shares vest against qualifying payments of up to $8 billion. Amazon gained 2.1%.
SOXX gains 3.4% as yields and oil fall
Semiconductors rose with large-cap technology as Treasury yields and crude fell, a partial repair of Monday's 5.6% drop in iShares Semiconductor ETF SOXX. West Texas Intermediate futures last traded at $101.29, down 1.1%. Super Micro Computer climbed 9.5%. Arm Holdings gained 8.6%, Intel 7.7%. Advanced Micro Devices added 6.4% and Micron 5.5%. The semiconductor fund gained 3.4%. Roundhill Memory ETF DRAM rose 4.4%. YieldMax's Super Micro option-income fund SMCY returned 6.2%, including a $0.0669 weekly distribution.
The Nasdaq Composite closed 1.7% higher at 26,418. Invesco QQQ Trust QQQ gained 1.7%. Technology sector fund XLK rose 2.2%.
The chip fund is still 2.2% lower over one month and 21% below its 52-week high. Thursday took back a piece of Monday. It did not take back the month.
ETFs in this story
Frequently asked questions
Why did ARKG jump so much?
Four holdings, Tempus AI, Twist Bioscience, Schrödinger and Absci, accounted for 3.4 percentage points of the fund's gain.
Was this a turn for genomics?
No: the fund was already up 19% over one month and 78% year to date, so the move was a continuation.
What drove Generac's 18% gain?
An 8-K disclosed that Amazon will take backup generators for its data centers, with initial deliveries expected to total $2.4 billion in 2027 and 2028.
Did semiconductors recover from Monday's drop?
Only partly: the chip fund gained 3.4% but remains 2.2% lower over one month and 21% below its 52-week high.
