What are Rona Anhalt’s Certara (CERT) share holdings after these transactions?

Following the RSU conversion and tax withholding, Rona Anhalt directly holds 11,883 shares of Certara common stock. This reflects the net position after 9,764 RSUs vested and 3,062 shares were withheld to cover associated tax obligations on April 1, 2026.

Certara (CERT) HR chief nets 11,883 shares after RSU vesting and tax withholding

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Certara, Inc. Chief Human Resources Officer Rona Anhalt exercised restricted stock units and settled related taxes in shares. She converted 9,764 RSUs into 9,764 shares of common stock on April 1, 2026, as part of a grant made on May 20, 2025 under the 2020 Incentive Plan.

Of these vested shares, 3,062 were withheld to cover tax obligations linked to the RSU vesting, leaving 11,883 shares of common stock held directly after the transactions. One-third of the RSUs vested on April 1, 2026, with the remaining two-thirds scheduled to vest in equal parts on April 1, 2027 and April 1, 2028.

Insider Trade Summary

9,764 shares exercised/converted

Mixed 3 txns

Insider Anhalt Rona

Role Chief Human Resources Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	9,764	$0.00	--
Exercise	Common Stock	9,764	$0.00	--
Tax Withholding	Common Stock	3,062	$5.70	$17K

Holdings After Transaction: Restricted Stock Units — 19,528 shares (Direct); Common Stock — 14,945 shares (Direct)

Footnotes (1)

Each restricted stock unit ("RSU") was granted on May 20, 2025, under the Certara, Inc. ("Certara") 2020 Incentive Plan and represents a right to receive one share of common stock or the cash equivalent. One-third of the RSUs vested and were settled on April 1, 2026. The remaining two-thirds of the RSUs will vest and settle in equal parts on April 1, 2027 and April 1, 2028. Represents shares of Certara withheld to satisfy tax withholding obligations in connection with the vesting of RSUs exempt, under Rule 16b-3.

Key Figures

RSUs vested and exercised: 9,764 units Shares withheld for taxes: 3,062 shares at $5.70 Shares held after transactions: 11,883 shares +2 more

5 metrics

RSUs vested and exercised 9,764 units One-third of RSU grant vested and settled on April 1, 2026

Shares withheld for taxes 3,062 shares at $5.70 Withheld to satisfy tax obligations on RSU vesting

Shares held after transactions 11,883 shares Direct common stock holdings following April 1, 2026 events

RSU grant date May 20, 2025 Grant under Certara 2020 Incentive Plan

Future vesting dates April 1, 2027 and April 1, 2028 Remaining two-thirds of RSUs vest in equal parts

Key Terms

Restricted Stock Units, 2020 Incentive Plan, Rule 16b-3, tax withholding obligations

4 terms

Restricted Stock Units financial

"Each restricted stock unit ("RSU") was granted on May 20, 2025, under the Certara, Inc. 2020 Incentive Plan"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

2020 Incentive Plan financial

"granted on May 20, 2025, under the Certara, Inc. ("Certara") 2020 Incentive Plan"

Rule 16b-3 regulatory

"Represents shares of Certara withheld to satisfy tax withholding obligations in connection with the vesting of RSUs exempt, under Rule 16b-3."

Rule 16b-3 is a Securities and Exchange Commission regulation that exempts certain routine, pre-approved transactions by company insiders from automatic liability for short-term trading profits. It acts like a safe harbor: if an insider follows a formal plan or the board approves specific transactions in advance, profits from buying and selling company stock within six months are not automatically reclaimed. Investors care because the rule clarifies when insider trades are permissible and reduces uncertainty about potential clawbacks.

tax withholding obligations financial

"Represents shares of Certara withheld to satisfy tax withholding obligations in connection with the vesting of RSUs"

Form 4 Insider Transactions: What Each Field Means →

04/03/2026 - 04:04 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Anhalt Rona

(Last)

(First)

(Middle)

C/O CERRTARA, INC.

4 RADNOR CORPORATE CENTER, SUITE 350

(Street)

RADNOR

PENNSYLVANIA

19087

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Certara, Inc. [ CERT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Human Resources Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	04/01/2026		M		9,764	A	$0⁽¹⁾	14,945	D
Common Stock	04/01/2026		F		3,062⁽²⁾	D	$5.7	11,883	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	⁽¹⁾	04/01/2026		M			9,764	⁽¹⁾	04/01/2028	Common Stock	9,764	$0	19,528	D

Explanation of Responses:

1. Each restricted stock unit ("RSU") was granted on May 20, 2025, under the Certara, Inc. ("Certara") 2020 Incentive Plan and represents a right to receive one share of common stock or the cash equivalent. One-third of the RSUs vested and were settled on April 1, 2026. The remaining two-thirds of the RSUs will vest and settle in equal parts on April 1, 2027 and April 1, 2028.

2. Represents shares of Certara withheld to satisfy tax withholding obligations in connection with the vesting of RSUs exempt, under Rule 16b-3.

	/s/ Daniel Corcoran, as Attorney-in-Fact for Rona Anhalt	04/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What did Certara (CERT) executive Rona Anhalt report in this Form 4?

Rona Anhalt reported the exercise of 9,764 restricted stock units into common shares and a share withholding for taxes. These actions reflect routine settlement of equity compensation rather than open-market buying or selling activity in Certara stock.

How many Certara (CERT) RSUs vested for Rona Anhalt on April 1, 2026?

On April 1, 2026, 9,764 restricted stock units vested for Rona Anhalt and were settled into an equal number of Certara common shares. This vesting represents one-third of an RSU grant originally awarded on May 20, 2025 under the company’s 2020 Incentive Plan.

How many Certara (CERT) shares were withheld for taxes in this Form 4?

In connection with the RSU vesting, 3,062 Certara common shares were withheld to satisfy tax withholding obligations. This tax-related share withholding is coded as an “F” transaction and is not an open-market sale by the executive.

What is the vesting schedule for Rona Anhalt’s Certara (CERT) RSUs?

The RSU grant from May 20, 2025 vests in three equal installments. One-third vested and settled on April 1, 2026, and the remaining two-thirds are scheduled to vest and settle in equal parts on April 1, 2027 and April 1, 2028.

Was this Certara (CERT) Form 4 an open-market stock purchase or sale?

No, the Form 4 reflects RSU vesting and share withholding for taxes, not open-market trading. The transactions are coded as “M” for derivative exercise/conversion and “F” for tax withholding, indicating equity compensation settlement rather than discretionary market buys or sells.