Companies · Biotechnology

Spear Bio Inc.

Woburn · Biotechnology

Diligence memoA one-page analyst read on Spear Bio Inc. — recommendation, valuation, rhythm, risks.
$50.1M
Total raised · real
4
Rounds
18.8×
Latest step-up
Top 19%
Sector rank · raised
Series C
Latest stage · inferred · Tue Jul 23 2024 00:00:00 GMT+0000 (Coordinated Universal Time)

Spear Bio Inc. looks fair against its niche peers and is quiet on financing cadence.

Synthesized from the figures below est. — every claim rests on a number shown on this page. Valuation uses the biotech sector profile.

Analyst read est. — computed against this company's niche peers in the same era. Inputs shown; not a quoted figure.

Fair
  • Modeled value is 0.79× the median modeled value of Series C Biotechnology companies in 2022–2024 (111 peers) — value vs value, same stage and era.
  • Within the normal band (79% of peer median) for its niche.
Quiet
  • Last raise 23 mo ago; this sector typically re-raises about every 14 months.
  • Slightly overdue versus sector cadence.
Leadership

No named principal in this company's public records yet — see all operators below.

Explore how these operators interlock with other companies in the operator network.

Where it sits in Biotechnology

Spear Bio Inc. is one of 4291 Biotechnology companies tracked from Woburn. By capital raised it ranks in the upper tier (ahead of 82% of sector peers), and in the upper tier by modeled valuation est..

Ranking is computed against this company's own sector cohort — reported capital is fact; valuation tiers are modeled.

As reported in public records reported — not modeled.

US
Jurisdiction
Rule 506(b)
Reg D exemption
8
Investors (latest)
2021
Year incorporated
2024-07-23
First sale
Amount raised vs valuation, by round

Solid bars are reported offering amounts reported; hatched bars are the modeled post-money valuation est. — both on one shared scale so you can read raise-vs-worth at each round directly. Use the toggles to overlay data labels and the niche-peer / market average value lines.

Amount raised · realModeled valuation · estCumulative funded · real
$0$125M$250M$375M$500MSeed · 2021-03-15 Raised $1.1M (real) Modeled valuation $33M (est)$1.1M$33MSeed2021Seed · 2021-09-30 Raised $1.6M (real) Modeled valuation $35M (est)$1.6M$35MSeed2021Seed · 2022-10-11 Raised $2.4M (real) Modeled valuation $30M (est)$2.4M$30MSeed2022Series C · 2024-07-23 Raised $45M (real) Modeled valuation $392M (est)$45M$392MSeries C2024+$1.6M+$2.4M+$45MCumulative $50M

The line shows cumulative reported funding over the period; + labels show new capital added between points when there is room. Toggle on-bar figures, plus the niche-peer and market averages, to read this company against its cohort. Benchmarks are modeled medians.

Financing ladder & sequence gaps
Seed$1.1M · 2021
Seed extension$1.6M · 2021
Seed extension$2.4M · 2022
Series C$45.0M · 2024no Series A / Series B on file

Stages are modeled from round size (public records carry no series label). No record for: Pre-Seed, Series A, Series B — the company may have raised it under a different exemption, merged it into an adjacent record, or skipped it. Sequence completeness: 40%.

Modeled valuation trajectory
$391.9M
Base estimate est.
$139.2M
Conservative case
$590.5M
Upside case
$300.0M
Modeled post-money

Round size and date are reported; the stage label is inferred from round size (latest is Series Ca $40M–$100M round). Valuation is modeled from stage benchmarks scaled by the biotech sector profile. Directional, not a quoted figure.

Seed · modeled $33.1M · 2021-03-152021Seed · modeled $34.9M · 2021-09-30Seed · modeled $30.0M · 2022-10-11Series C · modeled $391.9M · 2024-07-232024
Model inputs · modeled:benchmark-stage-stepup-v1
15%
Dilution assumption
Implied ownership sold in the financing.
62%
Survival probability
46% low · 72% high
1.46×/yr
Annual markup
1.68×/yr upside case
1.9 yr
Elapsed time used
1.9 yr actual, capped for stale marks
biotech
Sector profile
Adjusts growth and survival by industry.
Financing rhythm
13 mo
Avg between rounds
$14.9M/yr
Capital velocity
5.3 yr
On record since
2021
First round
4
Rounds on file
How it compares to the market

Benchmarked against 4291 companies in Biotechnology. Each bar is a median (the middle company, not an average — outliers don't skew it). Two yardsticks: real money raised (reported on Form D) and modeled value (our estimate est.). These are whole-sector medians across all stages, except the per-stage row.

Total raised — vs sector median (real $, all stages) 7.0× above median
This company$50.1M
Sector median$7.2M
Latest round — vs other Series C rounds in sector (real $, this stage) 1.0× of median
This company$45.0M
Sector median$46.5M
Modeled value — vs sector median (estimate, all stages) 6.1× above median
This company$391.9M
Sector median$64.2M

Raised more than 82% of sector peers (real $). Modeled value above 80% of peers (estimate).

Niche peers — same stage & era

A tighter cohort than the sector chart above — only companies at the same stage (Series C) that last raised in the same ~3-year era, ranked by modeled value est. (not money raised). This is the exact set the analyst read compares against, so a like-for-like cohort is what makes "over/under-valued" meaningful. This company ranks #70 of 111.

This companyCohort peer
$100.0M$1.0B$10.0B$10.0M$100.0M$1.0BCapital raised (log)Dianthus Therapeutics, Inc. · Series C Raised $121.5M · modeled $2.1B (est)Satellite Biosciences, Inc. · Series C Raised $101.5M · modeled $1.8B (est)Deepcell, Inc. · Series C Raised $96.9M · modeled $1.7B (est)Ventus Therapeutics U.S., Inc. · Series C Raised $186.8M · modeled $1.6B (est)Morphic Holding, Inc. · Series C Raised $200.6M · modeled $1.5B (est)Genleap Ai Inc. · Series C Raised $100.0M · modeled $1.5B (est)Dren Bio, Inc. · Series C Raised $93.1M · modeled $1.3B (est)Lenz Therapeutics, Inc. · Series C Raised $136.2M · modeled $1.2B (est)eyeBrain Medical, Inc. · Series C Raised $126.3M · modeled $1.2B (est)A2 Biotherapeutics, Inc. · Series C Raised $143.1M · modeled $1.2B (est)Invetx, Inc. · Series C Raised $70.7M · modeled $1.2B (est)Hexagon Bio Inc. · Series C Raised $148.6M · modeled $1.2B (est)Spear Bio Inc. (this company) Raised $50.1M · modeled $391.9M (est)Spear Bio Inc.
CompanyStageRaised · realValue · estvs peer med.
Dianthus Therapeutics, Inc.Series C$121.5M$2.1B4.22×
Satellite Biosciences, Inc.Series C$101.5M$1.8B3.63×
Deepcell, Inc.Series C$96.9M$1.7B3.38×
Ventus Therapeutics U.S., Inc.Series C$186.8M$1.6B3.14×
Morphic Holding, Inc.Series C$200.6M$1.5B3.04×
Genleap Ai Inc.Series C$100.0M$1.5B3.00×
Dren Bio, Inc.Series C$93.1M$1.3B2.70×
Lenz Therapeutics, Inc.Series C$136.2M$1.2B2.49×
eyeBrain Medical, Inc.Series C$126.3M$1.2B2.45×
A2 Biotherapeutics, Inc.Series C$143.1M$1.2B2.42×
Invetx, Inc.Series C$70.7M$1.2B2.36×
Hexagon Bio Inc.Series C$148.6M$1.2B2.36×
Spear Bio Inc. this companySeries C$50.1M$391.9M0.79×
Full financing history

Stage is inferred from round size est., not reported on the filing — a round's dollar size maps to a bucket: Pre-Seed <$1.0M · Seed $1.0M–$4.0M · Series A $4.0M–$15M · Series B $15M–$40M · Series C $40M–$100M · Series D+ $100M–$400M · Growth/Late >$400M.

StageAmount · realAnnouncedPost-money · estValue · estConf.
Seed$1.1M2021-03-15$5.5M$33.1M90%
Seed$1.6M2021-09-30$7.9M$34.9M90%
Seed$2.4M2022-10-11$12.0M$30.0M90%
Series C$45.0M2024-07-23$300.0M$391.9M90%
What happened at each round

Step-up, pace versus the sector's normal cadence, and revenue/exemption moves — read straight from the reported round facts reported.

  1. Seed$1.1M2021-03-15
    • First recorded raise — entered as Seed.
    • 4 investors on this round.
  2. Seed$1.6M2021-09-30
    • Came back fast: 7 mo vs the ~14 mo sector norm.
    • Round 1.4× larger than the prior — scaling up.
    • 3 investors on this round.
  3. Seed$2.4M2022-10-11
    • Raised 12 mo later, in step with the ~14 mo sector norm.
    • Round 1.5× larger than the prior — scaling up.
    • 5 investors on this round.
  4. Series C$45.0M2024-07-23
    • Raised again after 21 mo — slower than the ~14 mo sector norm.
    • Round 18.8× larger than the prior — scaling up.
    • 8 investors on this round.
Intelligence
2025 ~Q3
Modeled next raise · ~13mo cadence
$135.0M
Modeled next size est.range $87.7M$216.0M
18.8×
Last step-up
$14.9M/yr
Capital velocity

Predictive signals are modeled est. from this company's own cadence and step-up, plus sector benchmarks — directional, not advice. Peer set and a CSV export live in your analyst workspace.

Key people & operators

Officers, directors and promoters named in this company's public recordsreported — the people who run it (not its investors). "Also runs" counts come from name-matching across all records, so verify before acting.

PersonRoleAlso runsTied since
David Singer6 other2024-07
John Wu3 other2021-09
Michael Natan2 other2021-03
Peng Yin2 other2021-03
Vikram Bajaj2 other2024-07
Feng Xuan2021-09
Jerome Clavel2022-10
Wen Chan2024-07
Registry & provenance

Spear Bio Inc. is an official record sourced from the U.S. Securities and Exchange Commission (SEC). U.S. data is aggregated from SEC Form D filings.

United States
Country of record
US
Jurisdiction
1852708
SEC CIK
2021
Incorporated
Similar companies

Nearest neighbours across the whole database — matched on sector, stage and capital scale, and on shared operators (officers or directors named at both companies in public filings). A discovery shortlist, not a valuation cohort — verify before acting, the same way modeled figures are directional.

CompanySectorStageRaised · realValue · estWhy similar
Ultivue, Inc.BiotechnologySeries B$55.2M$23.4Mnetwork2 shared operators · same sector
AltheaDx, Inc.BiotechnologySeries B$51.8M$137.3Mnetwork1 shared operator · same sector
Navigator Medicines, Inc.BiotechnologySeries C$50.0M$421.6Msame sector · same stage
Latigo Biotherapeutics, Inc.BiotechnologySeries C$50.0M$357.5Msame sector · same stage
IntraBio IncBiotechnologySeries C$50.6M$459.5Msame sector · same stage
Arda Therapeutics, Inc.BiotechnologySeries C$50.8M$356.1Msame sector · same stage
Tasca Therapeutics CorpBiotechnologySeries C$48.1M$372.3Msame sector · same stage
SRT Therapeutics, Inc.BiotechnologySeries C$47.4M$316.4Msame sector · same stage
Semantically similar

Matched by meaning, not labels — a local language model reads each company's name, sector and description and ranks the closest in that learned space. This catches look-alikes that cross sector boundaries; the structured list above explains its matches, this one trusts the text. Directional, like every modeled signal here.

CompanySectorStageValue · estMatch
Pepper Bio, Inc.BiotechnologySeed$1.7M88%
Trident Labs, Inc.BiotechnologySeries A$506.1M88%
Keystone Bio, Inc.BiotechnologySeries A$180.8M87%
Dash Bio, Inc.BiotechnologySeries A$36.5M87%
Trevarx Biomedical, Inc.BiotechnologyPre-Seed$833K86%
TRex Holdings Inc.BiotechnologySeries C$329.3M86%
Flagship Biosciences, Inc.BiotechnologySeries B$39.2M86%
Trait Biosciences Inc.BiotechnologySeries A$28.5M86%
Frequently asked
How much funding has Spear Bio Inc. raised?
Spear Bio Inc. has raised approximately $50.1M in disclosed capital across 4 recorded financing rounds, aggregated from public filings.
What is Spear Bio Inc.'s estimated valuation?
Provath's modeled valuation for Spear Bio Inc. is approximately $391.9M (modeled range $139.2M–$590.5M). This is an algorithmic estimate derived from round sizes and same-niche peers — not a quoted or reported figure.
What funding stage is Spear Bio Inc. at?
Spear Bio Inc.'s latest modeled financing stage is Series C. Its most recent recorded round closed around Tue Jul 23.
What does Spear Bio Inc. do and where is it based?
Spear Bio Inc. operates in the Biotechnology sector, based in Woburn.
Explore related

See where Spear Bio Inc. sits in the wider market — its sector, location and stage cohorts, each with their own leaderboards and capital-flow timelines.

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