- Notification that Quarterly Report will be submitted late (NT 10-Q)

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 12b-25

Commission File Number 000-25594

NOTIFICATION OF LATE FILING

|_| Form 10-K |_| Form 11-K |_| Form 20-F |X| Form 10-Q
|_| Form N-SAR

For Period Ended: March 31, 2009

|_| Transition Report on Form 10-K |_| Transition Report on Form 10-Q
|_| Transition Report on Form 20-F |_| Transition Report on Form N-SAR

For the Transition Period Ended: _______________________________________

Nothing in this form shall be construed to imply that the Commission has
verified any information contained herein.

If the notification relates to a portion of the filing checked above, identify the item(s) to which the notification relates: ______________________

PART I
REGISTRANT INFORMATION

Full name of registrant ProtoSource Corporation Former name if applicable Address of principal executive office One Bethlehem Plaza, 4th Floor City, state and zip code Bethlehem, Pennsylvania 18018

PART II
RULE 12b-25 (b) AND (c)

If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule 12b-25 (b), the following should be completed. (Check box if appropriate.)

| (a) The reasons described in reasonable detail in Part III of | this form could not be eliminated without unreasonable | effort or expense; | (b) The subject annual report, semi-annual report, transition | report on Form 10-K, 20-F, 11-K or Form 10-Q, or portion | thereof will be filed on or before the 15th calendar day |X| | following the prescribed due date; or the subject quarterly | report or transition report on Form 10-Q, or portion | thereof will be filed on or before the fifth calendar day | following the prescribed due date; and | (c) The accountant's statement or other exhibit required by | Rule 12b-25(c) has been attached if applicable.

---

PART III NARRATIVE

State below in reasonable detail the reasons why Form 10-K, 11-K, 20-F, 10-Q, N-SAR or the transition report portion thereof could not be filed within the prescribed time period.

The registrant is in the process of preparing and reviewing the financial information of the Company on a consolidated basis. The process of compiling and disseminating the information required to be included in the Form 10-Q, could not be completed without incurring undue hardship and expense.

PART IV
OTHER INFORMATION

(1) Name and telephone number of person to contact in regard to this notification

Peter Wardle [phone]
(Name) (Area Code) (Telephone Number)

(2) Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant was required to file such report(s) been filed? If the answer is no, identify report(s).

|X| Yes |_| No

(3) Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof?

|_| Yes |X| No

If so: attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made.

---

ProtoSource Corporation
Name of Registrant as Specified in Charter.

Has caused this notification to be signed on its behalf by the undersigned thereunto duly authorized.

Date: May 13, 2009 By: /s/ PETER WARDLE ---------------- Peter Wardle, Chief Executive Officer