Kaleido Biosciences, Inc.

KLDOOTCHealthcare● Active

$0.00

+$0.00(+0.00%)

Market Cap$4262

P/E Ratio—

52W High$0.19

52W Low$0.00001

Avg Volume2K

Open$0.00

Beta-1.17

Insider Trades Ownership Employees

Kaleido Biosciences, Inc. (KLDO) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · KLDO · as of Jun 9, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

0.00

Buy/Sell (by trades)

Overall sentiment

NEUTRAL

↑ Buy 0%Active transactions only · RSU vesting excluded100% Sell ↓

Kaleido Biosciences, Inc. insiders have shown mixed buying and selling activity over the past 12 Months.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 9, 2026

KLDO insider buying and selling by quarter

KLDO insider selling · KLDO insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

2.5M1.2M0

2020 Q1

2020 Q2

2020 Q4

2021 Q1

2021 Q2

2021 Q3

2021 Q4

2022 Q1

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 9, 2026

Recent insider transactions

KLDO executive sell shares · KLDO board member insider trading · KLDO insider trading SEC filing

Showing 23 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
Feb 8, 2021	Menichella Daniel L CEO · Director	Purchase	20,000	$11.50	$230K	20,000	Form 4
Feb 8, 2021	Flagship Ventures Fund IV General Partner LLC 10 percent owner	Purchase	71,667	$11.50	$824K	2,982,639	Form 4
Feb 8, 2021	Flagship Ventures Fund IV General Partner LLC 10 percent owner	Purchase	71,666	$11.50	$824K	1,685,444	Form 4
Feb 8, 2021	Flagship Ventures Fund IV General Partner LLC 10 percent owner	Purchase	71,667	$11.50	$824K	738,333	Form 4
Jun 4, 2020	Flagship Ventures Fund IV General Partner LLC 10 percent owner	Purchase	666,667	$7.50	$5.00M⚡	2,910,972	Form 4
Jun 4, 2020	Flagship Ventures Fund IV General Partner LLC 10 percent owner	Purchase	666,667	$7.50	$5.00M⚡	1,613,778	Form 4
Jun 4, 2020	Flagship Ventures Fund IV General Partner LLC 10 percent owner	Purchase	666,666	$7.50	$5.00M⚡	666,666	Form 4
Jun 4, 2020	MELAS KYRIAZI THEO Director	Purchase	33,333	$7.50	$250K	33,333	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Purchase	333,333	$15.00	$5.00M⚡	6,560,523	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Other	625,625	—	—	6,227,190	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Other	964,010	—	—	5,601,565	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Other	4,637,555	$0.00	$5K	4,637,555	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Purchase	266,667	$15.00	$4.00M⚡	2,560,096	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Other	321,337	—	—	2,293,429	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Purchase	333,333	$15.00	$5.00M⚡	2,244,305	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Other	426,240	—	—	1,972,092	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Other	625,625	—	—	1,910,972	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Other	1,545,852	$0.00	$2K	1,545,852	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Other	1,285,347	—	—	1,285,347	Form 4
Mar 4, 2019	Flagship Ventures Fund V General Partner LLC Director	Other	639,360	—	—	639,360	Form 4
Mar 4, 2019	Flagship Ventures Fund IV General Partner LLC Director	Other	281,203	—	—	947,111	Form 4
Mar 4, 2019	Flagship Ventures Fund IV General Partner LLC Director	Other	665,908	$0.00	$666	665,908	Form 4
Mar 4, 2019	Flagship Ventures Fund IV General Partner LLC Director	Other	173,586	—	—	216,451	Form 4

Menichella Daniel L

CEO · Director

Purchase

Date

Feb 8

20,000

Price

$11.50

Value

$230K

View Form 4 on SEC.gov

Flagship Ventures Fund IV General Partner LLC

10 percent owner

Purchase

Date

Feb 8

71,667

Price

$11.50

Value

$824K

View Form 4 on SEC.gov

Flagship Ventures Fund IV General Partner LLC

10 percent owner

Purchase

Date

Feb 8

71,666

Price

$11.50

Value

$824K

View Form 4 on SEC.gov

Flagship Ventures Fund IV General Partner LLC

10 percent owner

Purchase

Date

Feb 8

71,667

Price

$11.50

Value

$824K

View Form 4 on SEC.gov

Flagship Ventures Fund IV General Partner LLC

10 percent owner

Purchase

Date

Jun 4

666,667

Price

$7.50

Value

$5.00M ⚡

View Form 4 on SEC.gov

Flagship Ventures Fund IV General Partner LLC

10 percent owner

Purchase

Date

Jun 4

666,667

Price

$7.50

Value

$5.00M ⚡

View Form 4 on SEC.gov

Flagship Ventures Fund IV General Partner LLC

10 percent owner

Purchase

Date

Jun 4

666,666

Price

$7.50

Value

$5.00M ⚡

View Form 4 on SEC.gov

MELAS KYRIAZI THEO

Director

Purchase

Date

Jun 4

33,333

Price

$7.50

Value

$250K

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Purchase

Date

Mar 4

333,333

Price

$15.00

Value

$5.00M ⚡

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Other

Date

Mar 4

625,625

Price

—

Value

—

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Other

Date

Mar 4

964,010

Price

—

Value

—

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Other

Date

Mar 4

4,637,555

Price

$0.00

Value

$5K

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Purchase

Date

Mar 4

266,667

Price

$15.00

Value

$4.00M ⚡

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Other

Date

Mar 4

321,337

Price

—

Value

—

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Purchase

Date

Mar 4

333,333

Price

$15.00

Value

$5.00M ⚡

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Other

Date

Mar 4

426,240

Price

—

Value

—

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Other

Date

Mar 4

625,625

Price

—

Value

—

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Other

Date

Mar 4

1,545,852

Price

$0.00

Value

$2K

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Other

Date

Mar 4

1,285,347

Price

—

Value

—

View Form 4 on SEC.gov

Flagship Ventures Fund V General Partner LLC

Director

Other

Date

Mar 4

639,360

Price

—

Value

—

View Form 4 on SEC.gov

Flagship Ventures Fund IV General Partner LLC

Director

Other

Date

Mar 4

281,203

Price

—

Value

—

View Form 4 on SEC.gov

Flagship Ventures Fund IV General Partner LLC

Director

Other

Date

Mar 4

665,908

Price

$0.00

Value

$666

View Form 4 on SEC.gov

Flagship Ventures Fund IV General Partner LLC

Director

Other

Date

Mar 4

173,586

Price

—

Value

—

View Form 4 on SEC.gov

▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About KLDO insider trading

KLDO insider trades

Kaleido Biosciences, Inc. (KLDO) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including KLDO. Over the past 12 months, 0 insiders have filed transactions with the SEC. KLDO insiders have been mixed buying and selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For Kaleido Biosciences, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

KLDO insider trading · 5 questions

The insiders of Kaleido Biosciences, Inc. (KLDO) include executives and directors such as KLDO, among others. Over the past 12 months, 0 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

KLDO board member insider tradingwho are KLDO insidersKLDO insider rosterKaleido Biosciences, Inc. executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 9, 2026