Why Synopsys, Inc. (SNPS) Stock Rose 12.8% on Oct 1, 2026
The clearest new catalyst: September 30 Investor Day — above-consensus FY27 guidance and long-term targets.
Why did SNPS stock rise?
Synopsys rose 12.78% to $490.54 on Thursday, October 1, 2026 (from $434.94), as the market digested its September 30 Investor Day. Synopsys guided fiscal 2027 revenue to $11.10-$11.20 billion (above the ~$10.8 billion consensus, up from a ~$9.7 billion FY2026 base), targeted a mid-20%s non-GAAP EPS CAGR and ~50% non-GAAP operating margin by FY2030, planned ~$1 billion of buybacks over the coming months, and announced a multi-year OpenAI 'GPT-Synopsys' partnership and a $1 billion-plus Amazon/AWS custom-silicon agreement. Bank of America ($600) and KeyBanc ($605) raised targets on October 1.
- September 30 Investor Day — above-consensus FY27 guidance and long-term targets: Held Wednesday, September 30 (not October 1), the Investor Day was the core catalyst for Thursday's move. Synopsys guided fiscal 2027 revenue to $11.10-$11.20 billion (midpoint $11.15 billion), above the ~$10.81 billion LSEG consensus and up from a ~$9.715 billion FY2026 midpoint, and set long-term targets of a mid-20%s (~25%) non-GAAP EPS CAGR through FY2030 and a ~50% non-GAAP operating margin. It also outlined an intention to repurchase roughly $1 billion of stock over the coming months, subject to market conditions.
- OpenAI and Amazon AI deals (announced Sep 30): Also disclosed September 30: a multi-year OpenAI partnership with a shared-revenue framework to build 'GPT-Synopsys' for automated chip design, and a multi-year Amazon/AWS agreement worth more than $1 billion for custom-silicon IP plus broader AWS collaboration. Both deals are real but were prior-day (September 30) announcements, not October 1 news — they underpinned Thursday's rally rather than breaking that day.
- October 1 analyst target hikes: The freshest October 1 items were analyst reactions: Bank of America raised its price target to $600 from $500, and KeyBanc to $605 from $600, citing the stronger growth outlook. These followed, and reinforced, Thursday's digestion of the Investor Day.
How the story developed
- September 30, 2026Synopsys holds its 2026 Investor Day: above-consensus FY27 guidance, long-term targets, a ~$1B buyback plan, and OpenAI ('GPT-Synopsys') and Amazon/AWS ($1B+) agreements.
- October 1, 2026SNPS rises 12.78% to $490.54 as investors digest the Investor Day; BofA raises its target to $600 and KeyBanc to $605.
What it could mean for SNPS investors
The constructive case
- Above-consensus FY27 guidance plus mid-20%s EPS-CAGR and ~50% margin targets point to durable, AI-driven growth in chip-design software.
- The OpenAI and Amazon/AWS agreements tie Synopsys directly into leading AI-compute roadmaps.
- A ~$1 billion buyback signals management confidence and supports EPS.
The cautious case & what could invalidate it
- At ~58x FY27 GAAP earnings (~26x non-GAAP), the stock prices in a lot of the growth, leaving little room for disappointment.
- The OpenAI and Amazon deals need to convert into disclosed, material revenue to justify the re-rating.
- A one-day jump of this size makes the shares sensitive to any shift in AI-spending sentiment.
Initial detection
BestStocks first flagged SNPS intraday on Oct 1, 2026; this analysis was finalized after the close using the confirmed +12.8% session move and additional catalyst research.
Show the initial intraday note
Synopsys, Inc. (SNPS) rose 12.78% to close at $490.54 on Thursday, October 1, 2026 (from $434.94), as investors digested the chip-design software maker's 2026 Investor Day, held the prior day (Wednesday, September 30). At that event Synopsys guided fiscal 2027 revenue to $11.10-$11.20 billion (above the ~$10.8 billion consensus), targeted a mid-20%s non-GAAP EPS CAGR and ~50% non-GAAP operating margin by fiscal 2030, outlined a plan to buy back roughly $1 billion of stock over the coming months, and unveiled a multi-year OpenAI 'GPT-Synopsys' partnership and a $1 billion-plus Amazon/AWS custom-silicon deal. On Thursday, Bank of America raised its target to $600 (from $500) and KeyBanc to $605 (from $600).
What to watch next: The rally reflects a credible long-term AI/chip-design growth story, but the stock is richly valued — about 58x fiscal 2027 GAAP EPS (though only ~26x on a non-GAAP basis) — so execution against the Investor Day targets matters. Watch whether the OpenAI and Amazon engagements convert into disclosed revenue, the pace of the ~$1 billion buyback, and FY2027 guidance confirmation at the next earnings report. After a one-day jump this size, the shares are sensitive to any wobble in AI-spending sentiment.
Other developments that session
Synopsys announces new partnerships with OpenAI and Amazon to capitalize on AI demand.
Frequently asked questions
Why did Synopsys, Inc. (SNPS) stock rise on Oct 1, 2026?
Synopsys rose 12.78% to $490.54 on Thursday, October 1, 2026 (from $434.94), as the market digested its September 30 Investor Day. Synopsys guided fiscal 2027 revenue to $11.10-$11.20 billion (above the ~$10.8 billion consensus, up from a ~$9.7 billion FY2026 base), targeted a mid-20%s non-GAAP EPS CAGR and ~50% non-GAAP operating margin by FY2030, planned ~$1 billion of buybacks over the coming months, and announced a multi-year OpenAI 'GPT-Synopsys' partnership and a $1 billion-plus Amazon/AWS custom-silicon agreement. Bank of America ($600) and KeyBanc ($605) raised targets on October 1.
How much did SNPS stock rise on Oct 1, 2026?
SNPS rose 12.8% during the Oct 1, 2026 trading session.
What were the main drivers behind SNPS's move?
September 30 Investor Day — above-consensus FY27 guidance and long-term targets; OpenAI and Amazon AI deals (announced Sep 30); October 1 analyst target hikes.