Notice of Proposed Sale · 144

Soluna Holdings, Inc.

SLNHNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Sep 3, 2026Accepted Sep 3, 2026, 11:54 AM EDTFiling CIK 64463Accession 0001959173-26-006693

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Structured filing — 144

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer: Soluna Holdings, Inc
Issuer CIK: 0000064463
SEC file number: 001-40261
Phone: 518-218-2500
Person for whose account securities are to be sold: Phelan William P
Relationships to issuer: Director
Street: 325 WASHINGTON AVENUE EXTENSION
City: ALBANY
State / country code: NY
Postal code: 12205

Securities proposed for sale

Securities proposed for sale · 1 reported row
Security	Proposed units	Aggregate market value	Units outstanding	Approximate sale date	Exchange	Broker / market maker
Common	12,037	12,686.94	244,590,575	09/03/2026	NASDAQ	Fidelity Brokerge Services LLC

Broker / market maker — proposed row 1, entry 1

Name: Fidelity Brokerge Services LLC
Street: 245 Summer Street
City: Boston
State / country code: MA
Postal code: 02110

Acquisition of securities to be sold

Acquisition of securities to be sold · 10 reported rows
Security	Acquired	Nature of acquisition	Acquired from	Amount acquired	Gift transaction	Payment date	Nature of payment
Common	08/10/2016	Open Market Purchase	Issuer	400	N	08/10/2016	Cash/Check
Common	08/24/2016	Open Market Purchase	Issuer	306	N	08/24/2016	Cash/Check
Common	10/31/2016	Open Market Purchase	Issuer	2,821	N	10/31/2016	Cash/Check
Common	11/01/2016	Open Market Purchase	Issuer	1,180	N	11/01/2016	Cash/Check
Common	01/14/2020	Stock Award	Issuer	700	N	01/14/2020	Compensation
Common	02/02/2021	Stock Award	Issuer	3,090	N	02/02/2021	Compensation
Common	03/25/2021	Stock Award	Issuer	300	N	03/25/2021	Compensation
Common	02/01/2023	Stock Award	Issuer	303	N	02/01/2023	Compensation
Common	02/01/2024	Stock Award	Issuer	799	N	02/01/2024	Compensation
Common	03/01/2025	Stock Award	Issuer	2,138	N	03/01/2025	Compensation

Sales reported in the preceding three months

Sales reported in the preceding three months · 12 reported rows
Seller	Security	Sale date	Amount sold	Gross proceeds
William Phelan	Preferred	06/17/2026	10,113	108,661.79
William Phelan	Preferred	06/18/2026	4,813	52,916.41
William Phelan	Preferred	06/22/2026	3,074	33,791.90
William Phelan	Preferred	08/19/2026	5,000	63,028.77
William Phelan	Preferred	08/20/2026	1,157	14,356.73
William Phelan	Preferred	08/21/2026	8,843	108,667.54
William Phelan	Preferred	08/24/2026	5,000	58,261.55
William Phelan	Preferred	08/25/2026	5,000	59,973.00
William Phelan	Preferred	08/26/2026	1,862	22,479.65
William Phelan	Preferred	08/27/2026	8,099	97,795.14
William Phelan	Preferred	08/28/2026	5,039	61,668.27
William Phelan	Preferred	08/31/2026	3,188	38,492.84

Seller — prior-sale row 1, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 2, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 3, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 4, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 5, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 6, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 7, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 8, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 9, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 10, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 11, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Seller — prior-sale row 12, entry 1

Name: William Phelan
Street: 325 Washington Ave
City: Albany
State / country code: NY
Postal code: 12205

Prior-sale reporting

Nothing to report for the preceding three months: N

Remarks

Shares to be sold out of the following accounts: -CHATHAM CAPITAL MANAGEMENT FBO WILLIAM P PHELAN 2,000 shares -WILLIAM P PHELAN 7,330 shares -FMT CO CUST IRA ROLLOVER FBO WILLIAM P PHELAN 2,707 shares

Notice signature

Notice date: 09/03/2026
Signed: /s/ Christian Nasser as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for William Phelan

Company context

We are currently developing new infrastructure projects intended to support AI and HPC workloads. These efforts include engagement with potential joint venture partners, conducting site and feasibility studies, securing access to power and land, and performing other early-stage development activities.

Current securities

SLNHNASDAQ · EQUITY · Current SLNHPNASDAQ · PREFERRED · Current

Historical securities (1)

MKTYOTC · EQUITY · Historical · closed Mar 23, 2021

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