SAN FRANCISCO — Hopin, a digital occasions start-up in London, had seven staff and was valued at $38 million in the beginning of the 12 months. Johnny Boufarhat, the corporate’s chief government, wasn’t planning on elevating extra money.However because the pandemic unfold and extra individuals held digital occasions, Hopin’s enterprise took off. Unsolicited presents from buyers began pouring in. “It’s like a drumbeat,” Mr. Boufarhat mentioned. “That’s develop into the brand new means for buyers to tempt founders.”In June, Hopin raised a recent $40 million from enterprise capital companies resembling Accel and IVP. Final month, with out even constructing a proper presentation, the corporate garnered an extra $125 million, valuing it at $2.1 billion — a 77-fold enhance from a 12 months in the past.And nonetheless, Mr. Boufarhat mentioned, “Traders are reaching out nearly each day.”On the onset of the pandemic, warnings of start-up doom abounded. These largely pale after the preliminary shock of the coronavirus wore off. Now, as the brand new actuality of distant work, college, purchasing and socializing supercharges the adoption of tech services and products, sentiment has flipped even additional — to a frenzy of deal making.Begin-ups like Discord and Robinhood are elevating extra money at sky-high valuations, after which getting inundated with new funding presents. Enterprise capitalists are combating to get into offers. And because the supply service DoorDash and the house rental start-up Airbnb put together to go public this week, the bonanza of preliminary public choices is more likely to enrich and gasoline Silicon Valley’s start-up growth much more.“Virtually each scorching firm proper now’s being pursued like mad,” mentioned Matt Murphy, an investor on the enterprise capital agency Menlo Ventures. “Greater than ever, there may be this flight to being within the property at any worth.”The growth is not only being pushed by increased demand for digital services and products. Low rates of interest are pushing buyers to hunt returns in ever-riskier property. Enterprise companies have raised file ranges of capital. A hovering inventory market has enabled extra I.P.O.s. Huge tech corporations are making daring acquisitions. Even Bitcoin has reached a brand new excessive.That helped start-ups amass $36.5 billion in funding within the third quarter, up 30 p.c from a 12 months earlier, based on CB Insights, which tracks personal financing. Begin-ups have raised 223 “mega-rounds” of $100 million or increased to this point this 12 months, on tempo to surpass final 12 months’s complete, based on Pitchbook.The typical valuations for extra mature start-ups additionally spiked to a excessive of $584 million, based on Pitchbook. And 81 I.P.O.s raised $28.5 billion within the third quarter, the busiest interval for listings since 2000, based on Renaissance Capital.“I haven’t seen something like this in over 20 years,” mentioned Eric Paley, an investor on the enterprise agency Founder Collective. “The occasion is as loud and the drinks are flowing as freely because the dot-com growth, regardless of that we’re all consuming at residence and alone.”Whereas some start-ups have retrenched within the pandemic, much more have discovered themselves on the suitable aspect of the economic system’s “feast or famine” cut up. With the coronavirus compressing years of tech adoption into just a few months, lesser-known software program corporations centered on areas like cloud computing, monetary know-how and collaboration instruments have thrived. Wall Road lately provided heat welcomes to public listings from fast-growing software program start-ups resembling Snowflake, Asana, JFrog, Sumo Logic and Unity.The world underestimated simply how huge the already-huge tech trade might develop into, mentioned Roseanne Wincek, an investor at Renegade Companions. “Increasingly persons are waking as much as that,” she mentioned.On Wednesday, DoorDash plans to checklist its shares and go public at a valuation as excessive as $35.Three billion, greater than double its final personal valuation. The corporate elevated its proposed worth vary to $90 to $95 a share on Friday, up from $75 to $85. The itemizing might assist redeem SoftBank, the swashbuckling mega-fund that was humbled final 12 months by a spate of dangerous investments in start-ups resembling actual property firm WeWork.Airbnb, which was crippled by the journey shutdowns within the spring, then plans to go public the following day. The corporate plans to boost the proposed worth vary on its itemizing, mentioned an individual with data of the scenario, boosting its valuation to as excessive as $42 billion, or 32 p.c above the place it was earlier than the pandemic.Non-public start-ups usually elevate funding each 12 to 18 months, however with buyers furiously competing to present them cash, that timeline has now shrunk to 3 to 6 months, entrepreneurs and buyers mentioned. Some start-ups are even closing back-to-back rounds of funding at increased valuations.After Discord, a social media platform, raised cash in June valuing it at $3.5 billion, buyers instantly known as to present the corporate extra funding, mentioned one individual with data of the corporate. Now Discord is in talks to boost extra and to double its valuation to $7 billion, mentioned two individuals with data of the talks, who weren’t approved to talk publicly. Discord declined to remark. TechCrunch first reported on its new funding.Instacart, a grocery supply firm, additionally raised two blockbuster rounds of funding this 12 months, greater than doubling its valuation to $17.7 billion. Robinhood, the inventory buying and selling app, has pulled in $1.25 billion in 4 completely different funding rounds this 12 months, valuing it at $11.7 billion.In a pandemic, buyers have discovered it tough to impress entrepreneurs with posh dinners or celebrity-laden events. However they’ve gained an edge by transferring the quickest.Rahul Vohra, an entrepreneur who additionally backs younger start-ups, incessantly hears an organization’s pitch, conducts diligence, indicators a deal and wires the cash all in the identical day, he mentioned.“There’s no level in sitting on the deal,” Mr. Vohra mentioned. Ready per week means the deal might get dearer or develop into overcrowded with different buyers, costing him an opportunity to take a position, he mentioned.In late summer time, Addition, an funding fund, approached Snyk, a safety software program start-up, about taking extra money. Inside 48 hours of assembly, Snyk signed a funding settlement. The funding, raised simply eight months after Snyk’s final spherical, valued the corporate at $2.6 billion, or 80 instances its annual recurring income of roughly $30 million.“They used pace to their benefit,” mentioned Peter McKay, Snyk’s chief government. “Traders who’re ready for somebody to boost a spherical — that’s nearly too late.”Henrique Dubugras, chief government of Brex, a start-up that gives bank cards to different start-ups, mentioned he had additionally had extra unsolicited calls from buyers. Early within the pandemic, Brex laid off 62 staff and closed a restaurant it operated in San Francisco’s South Park. However in June, enterprise began rebounding, he mentioned. Calls from enterprise capitalists quickly adopted.“I’ve truthfully by no means seen it as aggressive as it’s proper now,” Mr. Dubugras mentioned. He mentioned Brex was not presently planning to boost extra funding.The froth has created a way of unease amongst some buyers. Mr. Paley mentioned a few of Founder Collective’s portfolio corporations had raised “breathtaking” financing rounds that felt dangerous.“When individuals congratulate us, we’re sheepish about whether or not these nosebleed valuations are good for us or the founders,” he mentioned.However there’s little level in declaring the sky is falling, different buyers mentioned. Who would hear? For greater than a decade, outstanding buyers have tried to warn in opposition to start-up spending, valuations and bubbles. In that point, the tech trade has solely gotten larger, richer and extra highly effective.Some buyers pointed to Sequoia Capital, one among Silicon Valley’s best-known enterprise companies, which despatched a dramatic “Black Swan” memo in March telling corporations to arrange for a tough 12 months. Six months later, Roelof Botha, a Sequoia companion, mentioned at a digital TechCrunch convention that he hadn’t anticipated how a lot this period would profit tech corporations. Sequoia declined to remark.That very same week, three Sequoia-backed start-ups held profitable I.P.O.s. The agency will most definitely see new windfalls this week due to its investments in DoorDash and Airbnb. Sequoia additionally owns shares in Zoom, the videoconferencing firm that has gone from a $1 billion valuation to $116 billion in lower than two years.Frank Rotman, a enterprise capitalist at QED Traders, tweeted in August that the sample of start-ups elevating back-to-back rounds of funding was “essentially the most disturbing pattern I’m seeing.” He wrote that “an organization can simply fly off the rails with an excessive amount of simple and low cost cash of their checking account.” A number of high enterprise capitalists wrote him to say they agreed, he mentioned.Final week, as QED accomplished a brand new funding, one other enterprise agency requested to place cash into the identical firm at a twofold to threefold valuation enhance. The agency needed to get an settlement signed the day that Mr. Rotman’s agency wired its cash, which was the earliest second it could be attainable to strike one other deal.“That is madness,” Mr. Rotman mentioned.