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Schallenberger Mark A.

Disclosed activity across 1 company

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22198
SEC CIK
0001960742

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
Xtant Medical Holdings, Inc.XTNT · Entity 7196Chief Operating OfficerAugust 15, 2026August 18, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

Xtant Medical Holdings, Inc.

Report date August 15, 2026 · Filed August 18, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect1,106,087 Last balance in matching sequence After 2026-08-15 transaction · row 2 Source-order balances reconcile. Account continuity and personal attribution are not independently verified.
2 source rows

Row 1 · 2026-08-15 · Grant · Acquired 450,000 · Balance 1,113,157

F1: These shares will vest with respect to 112,500 shares on each of August 15, 2027, August 15, 2028, August 15, 2029, and August 15, 2030 pursuant to a deferred stock unit (DSU) award granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan, conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting date. The settlement of the vested shares underlying the DSU award has been deferred and will occur at a later date pursuant to the terms of the DSU award agreement. Each DSU represents a contingent right to receive one share of the Issuer's common stock.

F2: Includes an aggregate of 944,758 shares issuable upon vesting and settlement of restricted stock unit (RSU) awards or DSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan and 22,250 shares issuable upon vesting and settlement of RSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2018 Equity Incentive Plan, in each case conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting dates.

Row 2 · 2026-08-15 · Tax withholding · Disposed 7,070 · Balance 1,106,087

F3: These shares were withheld by the Issuer to pay tax withholding obligations upon vesting and settlement of restricted stock unit awards.

F2: Includes an aggregate of 944,758 shares issuable upon vesting and settlement of restricted stock unit (RSU) awards or DSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan and 22,250 shares issuable upon vesting and settlement of RSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2018 Equity Incentive Plan, in each case conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting dates.

Filing footnotes · ownership attribution and instrument terms

F1: These shares will vest with respect to 112,500 shares on each of August 15, 2027, August 15, 2028, August 15, 2029, and August 15, 2030 pursuant to a deferred stock unit (DSU) award granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan, conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting date. The settlement of the vested shares underlying the DSU award has been deferred and will occur at a later date pursuant to the terms of the DSU award agreement. Each DSU represents a contingent right to receive one share of the Issuer's common stock.

F2: Includes an aggregate of 944,758 shares issuable upon vesting and settlement of restricted stock unit (RSU) awards or DSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan and 22,250 shares issuable upon vesting and settlement of RSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2018 Equity Incentive Plan, in each case conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting dates.

F3: These shares were withheld by the Issuer to pay tax withholding obligations upon vesting and settlement of restricted stock unit awards.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

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Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
August 15, 2026 Filed Aug 18, 2026 22:02 UTC Xtant Medical Holdings, Inc. XTNT · Entity 7196 Tax withholdingCommon Stock 7,070 $0.31 $2,191.70
Disclosure

SEC source: 0001960742-26-000002 · primary_doc.xml · nonDerivative · entry 2

Schallenberger Mark A. · CIK 0001960742 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,106,087

F3 · kind: These shares were withheld by the Issuer to pay tax withholding obligations upon vesting and settlement of restricted stock unit awards.

F3 · shares: These shares were withheld by the Issuer to pay tax withholding obligations upon vesting and settlement of restricted stock unit awards.

F2 · balance_after: Includes an aggregate of 944,758 shares issuable upon vesting and settlement of restricted stock unit (RSU) awards or DSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan and 22,250 shares issuable upon vesting and settlement of RSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2018 Equity Incentive Plan, in each case conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting dates.

Read SEC document
August 15, 2026 Filed Aug 18, 2026 22:02 UTC Xtant Medical Holdings, Inc. XTNT · Entity 7196 GrantCommon Stock 450,000 $0.00 $0.00
Disclosure

SEC source: 0001960742-26-000002 · primary_doc.xml · nonDerivative · entry 1

Schallenberger Mark A. · CIK 0001960742 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,113,157

F1 · shares: These shares will vest with respect to 112,500 shares on each of August 15, 2027, August 15, 2028, August 15, 2029, and August 15, 2030 pursuant to a deferred stock unit (DSU) award granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan, conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting date. The settlement of the vested shares underlying the DSU award has been deferred and will occur at a later date pursuant to the terms of the DSU award agreement. Each DSU represents a contingent right to receive one share of the Issuer's common stock.

F2 · balance_after: Includes an aggregate of 944,758 shares issuable upon vesting and settlement of restricted stock unit (RSU) awards or DSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan and 22,250 shares issuable upon vesting and settlement of RSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2018 Equity Incentive Plan, in each case conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting dates.

Read SEC document
February 15, 2026 Filed Feb 18, 2026 21:36 UTC Xtant Medical Holdings, Inc. XTNT · Entity 7196 Tax withholdingCommon Stock 7,709 $0.58 $4,471.22
Disclosure

SEC source: 0001960742-26-000001 · primary_doc.xml · nonDerivative · entry 1

Schallenberger Mark A. · CIK 0001960742 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 663,157

F1 · kind: These shares were withheld by the Issuer to pay tax withholding obligations upon vesting and settlement of restricted stock unit awards.

F1 · shares: These shares were withheld by the Issuer to pay tax withholding obligations upon vesting and settlement of restricted stock unit awards.

F2 · balance_after: Includes an aggregate of 523,794 shares issuable upon vesting and settlement of restricted stock unit (RSU) awards or DSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan and 22,250 shares issuable upon vesting and settlement of RSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2018 Equity Incentive Plan, in each case conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting dates.

Read SEC document
November 15, 2025 Filed Nov 18, 2025 21:55 UTC Xtant Medical Holdings, Inc. XTNT · Entity 7196 GrantPerformance Stock Units (PSUs) · Derivative 584,506 $0.00 $0.00
Disclosure

SEC source: 0001960742-25-000003 · primary_doc.xml · derivative · entry 2

Schallenberger Mark A. · CIK 0001960742 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 584,506

Underlying: Common Stock · 584,506 shares

Expires 2028-11-15

F3 · derivative.exercise_price: Each PSU represents a contingent right to receive one share of the Issuer's common stock. The PSUs will vest and become earned in one-third increments based on the achievement of specified stock price performance goals during a three-year performance period and subject to additional service-based vesting conditions.

F4 · shares: Represents the maximum number of shares that may be issued pursuant to the PSUs, which is 200% of the target number of shares (292,253).

F3 · derivative.exercise_date: Each PSU represents a contingent right to receive one share of the Issuer's common stock. The PSUs will vest and become earned in one-third increments based on the achievement of specified stock price performance goals during a three-year performance period and subject to additional service-based vesting conditions.

F4 · derivative.underlying_shares: Represents the maximum number of shares that may be issued pursuant to the PSUs, which is 200% of the target number of shares (292,253).

F4 · balance_after: Represents the maximum number of shares that may be issued pursuant to the PSUs, which is 200% of the target number of shares (292,253).

Read SEC document
November 15, 2025 Filed Nov 18, 2025 21:55 UTC Xtant Medical Holdings, Inc. XTNT · Entity 7196 GrantCommon Stock 292,253 $0.00 $0.00
Disclosure

SEC source: 0001960742-25-000003 · primary_doc.xml · nonDerivative · entry 1

Schallenberger Mark A. · CIK 0001960742 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 670,866

F1 · shares: These shares will vest with respect to 73,063 shares on each of November 15, 2026, November 15, 2027, and November 15, 2028, and with respect to 73,064 shares on November 5, 2029 pursuant to a deferred stock unit (DSU) award granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan, conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting date. The settlement of the vested shares underlying the DSU award has been deferred and will occur at a later date pursuant to the terms of the DSU award agreement. Each DSU represents a contingent right to receive one share of the Issuer's common stock.

F2 · balance_after: Includes an aggregate of 523,794 shares issuable upon vesting and settlement of restricted stock unit (RSU) awards or DSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2023 Equity Incentive Plan and 44,500 shares issuable upon vesting and settlement of RSU awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2018 Equity Incentive Plan, in each case conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting dates.

Read SEC document
April 03, 2024 Filed Apr 5, 2024 20:23 UTC Xtant Medical Holdings, Inc. XTNT · Entity 7196 GrantCommon Stock 177,551 $0.00 $0.00
Disclosure

SEC source: 0001235802-24-000028 · primary_doc.xml · nonDerivative · entry 1

Schallenberger Mark A. · CIK 0001960742 · Chief Operations Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 382,695

F1 · shares: These shares will vest and be issued with respect to 44,388 shares on each of April 3, 2025, April 3, 2026, and April 3, 2027 and with respect to 44,387 shares on April 3, 2028 pursuant to a restricted stock unit award granted under the Xtant Medical Holdings, Inc. 2023 Equity Incentive Plan, conditioned upon the Reporting Person remaining an employee of Xtant through the vesting date.

F2 · balance_after: Includes an aggregate of 293,695 shares issuable upon vesting and settlement of restricted stock unit awards or deferred stock unit awards granted under the Xtant Medical Holdings, Inc. 2023 Equity Incentive Plan and 66,750 shares issuable upon vesting and settlement of restricted stock unit awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2018 Equity Incentive Plan, in each case conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting dates.

Read SEC document
April 03, 2024 Filed Jan 17, 2025 21:29 UTC Amendment Xtant Medical Holdings, Inc. XTNT · Entity 7196 GrantCommon Stock 173,469 $0.00 $0.00
Disclosure

SEC source: 0001235802-25-000007 · primary_doc.xml · nonDerivative · entry 1

Schallenberger Mark A. · CIK 0001960742 · Chief Operations Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 378,613

F1 · shares: The purpose of this Form 4 amendment (this "Form 4/A") is to adjust the number of shares issuable upon vesting and settlement of a deferred stock unit award granted on April 3, 2024. In addition, the adjustment has been made to the reporting person's vesting schedule in footnote (2) and the outstanding equity awards, including the number of deferred stock units as reflected on this Form 4/A and described in footnote (3) to this Form 4/A.

F2 · shares: These shares will vest and be issued with respect to 43,367 shares on each of April 3, 2025, April 3, 2026, and April 3, 2027 and with respect to 43,368 shares on April 3, 2028 pursuant to a deferred stock unit award granted under the Xtant Medical Holdings, Inc. 2023 Equity Incentive Plan, conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting date. The settlement of the vested shares, however, will occur at a later date pursuant to the terms of the award agreement.

F3 · balance_after: Includes an aggregate of 289,613 shares issuable upon vesting and settlement of restricted stock unit awards or deferred stock unit awards granted under the Xtant Medical Holdings, Inc. 2023 Equity Incentive Plan and 66,750 shares issuable upon vesting and settlement of restricted stock unit awards granted under the Xtant Medical Holdings, Inc. Amended and Restated 2018 Equity Incentive Plan, in each case conditioned upon the Reporting Person remaining an employee of Xtant through the applicable vesting dates.

Read SEC document
August 15, 2023 Filed Aug 17, 2023 21:20 UTC Xtant Medical Holdings, Inc. XTNT · Entity 7196 GrantStock Option (right to buy) · Derivative 135,501 $0.00 Strike: $1.20 $0.00
Disclosure

SEC source: 0001235802-23-000098 · primary_doc.xml · derivative · entry 2

Schallenberger Mark A. · CIK 0001960742 · Chief Operations Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 135,501

Underlying: Common Stock · 135,501 shares

Expires 2033-08-15

F3 · derivative.exercise_date: This option vests with respect to 33,875 shares on August 15, 2024 and with respect to the remaining 75% of such shares over the three-year period thereafter in 12 as nearly equal as possible quarterly installments, conditioned upon the Reporting Person remaining an employee of Xtant through the vesting date.

Read SEC document
August 15, 2023 Filed Aug 17, 2023 21:20 UTC Xtant Medical Holdings, Inc. XTNT · Entity 7196 GrantCommon Stock 116,144 $0.00 $0.00
Disclosure

SEC source: 0001235802-23-000098 · primary_doc.xml · nonDerivative · entry 1

Schallenberger Mark A. · CIK 0001960742 · Chief Operations Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 205,144

F1 · shares: These shares will vest and be issued with respect to 29,036 shares on each of August 15, 2024, August 15, 2025, August 15, 2026 and August 15, 2027 pursuant to a restricted stock unit granted under the Xtant Medical Holdings, Inc. 2023 Equity Incentive Plan, conditioned upon the Reporting Person remaining an employee of Xtant through the vesting date.

F2 · balance_after: Includes 116,144 shares to be issued upon vesting pursuant to a restricted stock unit award granted under the Xtant Medical Holdings, Inc. 2023 Equity Incentive Plan and 89,000 shares to be issued upon vesting pursuant to a restricted stock award granted under the Xtant Medical Holdings, Inc. Amended and Restated 2018 Equity Incentive Plan, all conditioned upon the Reporting Person remaining an employee of Xtant through the vesting dates.

Read SEC document
February 15, 2023 Filed Feb 17, 2023 21:42 UTC Xtant Medical Holdings, Inc. XTNT · Entity 7196 GrantStock Option (right to buy) · Derivative 105,000 $0.00 Strike: $0.77 $0.00
Disclosure

SEC source: 0001235802-23-000027 · primary_doc.xml · derivative · entry 2

Schallenberger Mark A. · CIK 0001960742 · Chief Operations Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 105,000

Underlying: Common Stock · 105,000 shares

Expires 2033-02-15

F2 · derivative.exercise_date: This option vests with respect to 26,250 shares on February 15, 2024 and with respect to the remaining 75% of such shares over the three-year period thereafter in 12 as nearly equal as possible quarterly installments, conditioned upon the Reporting Person remaining an employee of Xtant through the vesting date.

Read SEC document
February 15, 2023 Filed Feb 17, 2023 21:42 UTC Xtant Medical Holdings, Inc. XTNT · Entity 7196 GrantCommon Stock, $0.000001 par value 89,000 $0.00 $0.00
Disclosure

SEC source: 0001235802-23-000027 · primary_doc.xml · nonDerivative · entry 1

Schallenberger Mark A. · CIK 0001960742 · Chief Operations Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 89,000

F1 · shares: These shares will vest and be issued with respect to 22,250 shares on each of February 15, 2024, February 15, 2025, February 15, 2026 and February 15, 2027 pursuant to a restricted stock unit award granted under the Xtant Medical Holdings, Inc. Second Amended and Restated 2018 Equity Incentive Plan, conditioned upon the Reporting Person remaining an employee of Xtant through the vesting date.

F1 · balance_after: These shares will vest and be issued with respect to 22,250 shares on each of February 15, 2024, February 15, 2025, February 15, 2026 and February 15, 2027 pursuant to a restricted stock unit award granted under the Xtant Medical Holdings, Inc. Second Amended and Restated 2018 Equity Incentive Plan, conditioned upon the Reporting Person remaining an employee of Xtant through the vesting date.

Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.