PROS : Amended Statement of Ownership

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 2)*

PROS HOLDINGS, INC.

(Name of Issuer)

Common Stock, $0.01 Par Value

(Title of Class of Securities)

74346Y103

(CUSIP Number)

December 31, 2020

(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

• 1. Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d)
• The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see Instructions).

CUSIP No.: 74346Y103

1 NAME OF REPORTING PERSON Conestoga Capital Advisors, LLC

I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) 23-3072906

1. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
2. 1. [ ]
   2. [ ]
3. SEC USE ONLY
4. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

	5	SOLE VOTING POWER
NUMBER OF		2,394,991
6	SHARED VOTING POWER
SHARES
	0
BENEFICIALLY
OWNED BY EACH	7	SOLE DISPOSITIVE POWER
REPORTING
	2,526,766
PERSON WITH
	8	SHARED DISPOSITIVE POWER
		0

9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,526,766

10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ]

11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.82%

12 TYPE OF REPORTING PERSON IA

CUSIP No.: 74346Y103

ITEM 1(a). NAME OF ISSUER:

PROS HOLDINGS, INC.

ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

3100 Main Street, Suite 900 Houston, TX 77002

ITEM 2(a). NAME OF PERSON FILING:

Conestoga Capital Advisors, LLC

ITEM 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

550 E. Swedesford Rd. Suite 120

Wayne, PA 19087

ITEM 2(c). CITIZENSHIP:

Delaware

ITEM 2(d). TITLE OF CLASS OF SECURITIES:

Common Stock, $0.01 Par Value

ITEM 2(e). CUSIP NUMBER:

74346Y103

ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO SECTION 240.13d-1(b), or 13d-2(b) or (c) CHECK WHETHER THE PERSON FILING IS A:

(a)	[ ]	Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78c);
(b)	[ ]	Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	[ ]	Insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	[ ]	Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-
		8);

1. [X] An investment adviser in accordance with 240.13d-1(b)(1)(ii)(E);

(f)	[ ]	An employee benefit plan or endowment fund in accordance with 240.13d-1(b)(1)(ii)(F);
(g)	[ ]	A parent holding company or control person in accordance with 240.13d-1(b)(1)(ii)(G);
(h)	[ ]	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	[ ]	A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of
		the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	[ ]	A non-U.S. institution in accordance with 240.13d-1(b)(1)(ii)(J);
(k)	[ ]	Group, in accordance with 240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with
		240.13d1(b)(1)(ii)(J), please specify the type of institution:

ITEM 4. OWNERSHIP

(a) Amount beneficially owned:

As of December 31, 2020, the Reporting Person indirectly beneficially owned 2,526,766 shares 5.82% of the Issuers Common Stock. Such shares of the Issuers Common Stock were directly beneficially owned by the Accounts.

(b) Percent of class:

As of December 31, 2020, the Reporting Person indirectly beneficially owned 5.82% of the Issuers issued and outstanding Common Stock (based on 43,434,985 shares of the Issuers Common Stock outstanding as of October 22, 2020, as reported by the Issuer in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on October 29, 2020). Such shares of the Issuers Common Stock were directly beneficially owned by the Accounts, none of which beneficially owned more than 5%.

1. Number of shares as to which the person has:
2. 1. sole power to vote or to direct the vote:

2,394,991

1. shared power to vote or to direct the vote:
   0
2. sole power to dispose or direct the disposition of: 2,526,766
3. shared power to dispose or to direct the disposition of:
   0

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ ].

ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:

ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY:

ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

ITEM 9. NOTICE OF DISSOLUTION OF GROUP:

ITEM 10. CERTIFICATION:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.