Edgar Filing: ALLMERICA SECURITIES TRUST

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



	FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number			811-02338
Allmerica Securities Trust
(Name of Registrant)
440 Lincoln Street Worcester, Massachusetts				01653
(Address of Principal Executive Offices)				(Zip code)
Sheila B. St. Hilaire, Trust Secretary Allmerica Financial 440 Lincoln Street Worcester, MA 01653
(Name and Address of Agent for Service)

Registrant's telephone number, including area code:			(508) 855-1000

Date of fiscal year end:	December 31

Date of reporting period:		September 30, 2005

Item 1. Schedule of Investments.

ALLMERICA SECURITIES TRUST

PORTFOLIO OF INVESTMENTS - September 30, 2005 (Unaudited)

Par Value			Moody’s Ratings	Value
U.S. GOVERNMENT AGENCY MORTGAGE-BACKED OBLIGATIONS (g) - 0.2%

		Freddie Mac - 0.2%
$	48,747	5.00%, 05/15/21	NR	$	48,827
107,070		6.00%, 10/15/07	NR	108,110
				156,937

		Total U.S. Government Agency Mortgage-Backed Obligations
		(Cost $162,925)		156,937

Par Value			Moody’s Ratings	Value
U.S. GOVERNMENT OBLIGATIONS - 2.9%

		U.S. Treasury Bond - 2.9%
$	1,145,000	5.38%, 02/15/31 (a)	NR	$	1,282,757
270,000		6.25%, 08/15/23	NR	322,850
705,000		8.00%, 11/15/21	NR	975,930
				2,581,537

		Total U.S. Government Obligations
		(Cost $2,599,197)		2,581,537

Par Value			Moody’s Ratings	Value
CORPORATE NOTES AND BONDS - 76.7%

		Auto Manufacturers - 1.8%
$	500,000	DaimlerChrysler North America Holding Corp.
		7.30%, 01/15/12	A3	$	542,989
500,000		DaimlerChrysler North America Holding Corp.
		8.50%, 01/18/31	A3	605,351
500,000		General Motors Acceptance Corp.
		7.00%, 02/01/12	Ba1	451,539
				1,599,879

		Banks - 8.5%
880,000		Bank of America Corp.
		4.88%, 09/15/12	Aa2	879,780
500,000		Bank of America Corp.
		5.25%, 12/01/15	Aa3	508,022
200,000		Bank of New York Co., Inc.
		3.75%, 02/15/08	Aa3	196,249
1,000,000		Bank of New York Co., Inc.
		6.38%, 04/01/12	A1	1,081,121
655,000		Fifth Third Bank
		4.50%, 06/01/18	Aa3	613,525
500,000		Firstar Bank
		7.13%, 12/01/09	Aa2	546,425
450,000		HSBC Bank USA, Inc.
		4.63%, 04/01/14	Aa3	436,769
450,000		Marshall & Ilsley Corp.
		4.38%, 08/01/09	A1	444,898
420,000		National City Bank of Indiana
		4.88%, 07/20/07	Aa3	422,572

$	350,000	PNC Funding Corp.
		6.13%, 02/15/09	A3	$	364,877
125,000		Suntrust Banks, Inc.
		7.75%, 05/01/10	A1	140,039
500,000		U.S. Bancorp, MTN
		5.10%, 07/15/07	Aa2	504,355
475,000		Wachovia Bank N.A.
		4.85%, 07/30/07	Aa2	477,020
450,000		Wells Fargo & Co.
		5.13%, 09/01/12	Aa2	454,806
440,000		Zions Bancorporation
		5.65%, 05/15/14	Baa1	453,236
				7,523,694

		Beverages - 1.1%
450,000		Anheuser-Busch Cos., Inc.
		4.63%, 02/01/15	A1	441,789
500,000		Bottling Group LLC
		4.63%, 11/15/12	Aa3	494,273
				936,062

		Chemicals - 0.8%
200,000		Du Pont (E.I.) De Nemours and Co.
		8.25%, 09/15/06	Aa3	205,998
500,000		Praxair, Inc.
		6.63%, 10/15/07	A3	519,233
				725,231

		Cosmetics & Personal Care - 2.2%
500,000		Kimberly-Clark Corp.
		7.10%, 08/01/07	Aa2	522,100
300,000		Procter & Gamble Co.
		4.75%, 06/15/07	Aa3	301,277
1,000,000		Procter & Gamble Co.
		8.50%, 08/10/09	Aa3	1,138,844
				1,962,221

		Diversified Financial Services - 14.7%
500,000		American Express Co.
		3.75%, 11/20/07	A1	492,019
580,000		Bear Stearns Cos., Inc.
		4.00%, 01/31/08	A1	571,976
725,000		Capital One Bank
		4.88%, 05/15/08	Baa2	725,573
900,000		CIT Group, Inc., MTN
		5.13%, 09/30/14	A2	896,480
500,000		Citifinancial
		6.75%, 07/01/07	Aa1	517,468
460,000		Ford Motor Credit Co.
		6.50%, 01/25/07	Baa3	460,535
400,000		Ford Motor Credit Co.
		6.88%, 02/01/06	Baa3	401,637
825,000		Ford Motor Credit Co.
		7.25%, 10/25/11	Baa3	783,077

$	500,000	General Electric Capital Corp.
		8.75%, 05/21/07	Aaa	$	532,943
350,000		Goldman Sachs Group, Inc.
		3.88%, 01/15/09	Aa3	341,286
450,000		Goldman Sachs Group, Inc.
		5.70%, 09/01/12	Aa3	466,732
500,000		Household Finance Corp.
		8.00%, 07/15/10	A1	564,190
425,000		J. Paul Getty Trust
		5.88%, 10/01/33	Aaa	442,648
110,870		Jones (Edward D.) & Co., LP (b) (c)
		7.95%, 04/15/06	NR	112,757
900,000		JPMorgan Chase & Co.
		5.25%, 05/01/15	A1	905,628
500,000		Lehman Brothers Holdings, Inc.
		4.00%, 01/22/08	A1	493,252
605,000		MBNA Corp., MTN
		4.63%, 08/03/09	Baa1	603,743
350,000		MBNA Corp., MTN
		6.25%, 01/17/07	Baa2	356,574
85,000		MBNA Corp., MTN
		7.50%, 03/15/12	Baa2	96,640
1,630,000		Morgan Stanley
		4.75%, 04/01/14	A1	1,572,567
495,000		Morgan Stanley
		6.60%, 04/01/12	Aa3	536,270
550,000		Pitney Bowes Credit Corp.
		8.55%, 09/15/09	Aa3	623,842
500,000		Toyota Motor Credit Corp.
		5.50%, 12/15/08	Aaa	514,559
				13,012,396

		Electric - 5.6%
550,000		AmerenEnergy Generating
		7.75%, 11/01/05	A3	551,514
505,000		Centerpoint Energy, Inc.
		5.88%, 06/01/08	Ba1	515,458
375,000		Consolidated Edison Co. of New York
		4.70%, 06/15/09	A1	375,681
425,000		Detroit Edison Co.
		6.13%, 10/01/10	A3	449,063
563,466		East Coast Power LLC
		7.07%, 03/31/12	Baa3	588,800
250,000		Entergy Gulf States, Inc.
		3.60%, 06/01/08	Baa3	240,048
450,000		FirstEnergy Corp.
		6.45%, 11/15/11	Baa3	479,144
500,000		FirstEnergy Corp.
		7.38%, 11/15/31	Baa3	586,434
225,000		Florida Power & Light
		6.88%, 12/01/05	Aa3	226,042
450,000		Pacific Gas & Electric Co.
		6.05%, 03/01/34	Baa1	468,176
450,000		TXU Energy Co.
		7.00%, 03/15/13	Baa2	488,531
				4,968,891

		Environmental Control - 1.1%
$	450,000	Allied Waste North America (a)
		6.50%, 11/15/10	B2	$	437,063
500,000		Allied Waste North America
		8.50%, 12/01/08	B2	521,250
				958,313

		Food - 4.7%
1,500,000		Delhaize America, Inc.
		8.13%, 04/15/11	Ba1	1,625,718
296,000		General Mills, Inc.
		6.00%, 02/15/12	Baa2	313,506
470,000		Kroger Co.
		5.50%, 02/01/13	Baa2	471,729
350,000		Kroger Co.
		6.38%, 03/01/08	Baa2	361,147
450,000		Safeway, Inc.
		6.50%, 03/01/11	Baa2	469,399
830,000		Unilever Capital Corp.
		5.90%, 11/15/32	A1	875,352
				4,116,851

		Forest Products & Paper - 1.7%
1,000,000		Georgia-Pacific Group
		7.25%, 06/01/28	Ba2	1,028,750
500,000		International Paper Co.
		5.50%, 01/15/14	Baa2	497,985
				1,526,735

		Health Care-Products - 0.2%
120,000		Johnson & Johnson
		6.73%, 11/15/23	Aaa	143,415

		Home Builders - 1.7%
920,000		D.R. Horton, Inc.
		5.00%, 01/15/09	Ba1	907,811
500,000		Pulte Homes, Inc.
		8.13%, 03/01/11	Baa3	558,849
				1,466,660

		Lodging - 2.0%
900,000		Harrah’s Operating Co., Inc. (d)
		5.75%, 10/01/17	Baa3	880,939
500,000		Harrah’s Operating Co., Inc.
		7.13%, 06/01/07	Baa3	517,843
350,000		Park Place Entertainment Corp.
		8.13%, 05/15/11	Ba1	389,813
				1,788,595

		Media - 5.4%
400,000		AOL Time Warner, Inc.
		6.15%, 05/01/07	Baa1	408,826
550,000		AOL Time Warner, Inc.
		6.88%, 05/01/12	Baa1	601,087

$	270,000	Belo Corp.
		8.00%, 11/01/08	Baa3	$	289,817
420,000		Comcast Corp.
		5.30%, 01/15/14	Baa2	418,907
450,000		Continental Cablevision, Inc.
		8.30%, 05/15/06	Baa2	460,315
505,000		Cox Communications, Inc.
		7.13%, 10/01/12	Baa3	549,332
700,000		Echostar DBS Corp.
		5.75%, 10/01/08	Ba3	690,375
500,000		News America Holdings, Inc.
		7.38%, 10/17/08	Baa3	533,689
300,000		Time Warner Cos., Inc.
		7.57%, 02/01/24	Baa1	342,483
450,000		Time Warner Entertainment Co.
		7.25%, 09/01/08	Baa1	478,050
				4,772,881

		Metal Fabricate & Hardware - 1.2%
1,000,000		Precision Castparts Corp.
		5.60%, 12/15/13	Baa3	1,018,315

		Office & Business Equipment - 0.8%
750,000		Pitney Bowes, Inc.
		4.75%, 05/15/18	Aa3	723,735

		Oil & Gas - 5.4%
900,000		Atmos Energy Corp.
		4.00%, 10/15/09	Baa3	868,028
1,000,000		Caithness Coso Funding Corp. (d)
		5.49%, 06/15/19	Baa3	1,000,500
450,000		Devon Financing Corp.
		6.88%, 09/30/11	Baa2	494,648
450,000		Devon Financing Corp.
		7.88%, 09/30/31	Baa2	566,676
500,000		Enterprise Products Operating, LP
		5.00%, 03/01/15	Baa3	474,413
600,000		Texaco Capital, Inc.
		8.25%, 10/01/06	Aa3	616,787
330,000		Valero Energy Corp.
		4.75%, 06/15/13	Baa3	320,703
400,000		XTO Energy, Inc.
		7.50%, 04/15/12	Baa3	450,564
				4,792,319

		Packaging & Containers - 3.0%
1,750,000		Packaging Corp. of America
		5.75%, 08/01/13	Ba1	1,692,997
970,000		Sealed Air Corp. (d)
		5.63%, 07/15/13	Baa3	972,665
				2,665,662

		Pharmaceuticals - 4.1%
$	500,000	AmerisourceBergen Corp. (d)
		5.88%, 09/15/15	Ba2	$	493,750
750,000		Lilly (Eli) & Co.
		7.13%, 06/01/25	Aa3	915,820
710,000		Medco Health Solutions, Inc.
		7.25%, 08/15/13	Ba1	782,484
1,000,000		Mylan Laboratories, Inc. (d)
		5.75%, 08/15/10	Ba1	1,001,250
330,000		Zeneca Wilmington
		7.00%, 11/15/23	Aa2	400,439
				3,593,743

		Pipelines - 0.6%
500,000		Magellan Midstream Partners
		5.65%, 10/15/16	Ba1	506,130

		Retail - 3.1%
595,000		Home Depot, Inc.
		3.75%, 09/15/09	Aa3	576,707
500,000		J.C. Penney Co., Inc.
		7.38%, 08/15/08	Ba1	528,750
900,000		J.C. Penney Co., Inc.
		7.95%, 04/01/17	Ba1	1,044,000
450,000		Wal-Mart Stores, Inc.
		7.55%, 02/15/30	Aa2	572,125
				2,721,582

		Savings & Loans - 1.0%
455,000		Washington Mutual Bank FA
		5.50%, 01/15/13	A3	464,672
450,000		Washington Mutual, Inc.
		4.38%, 01/15/08	A3	446,983
				911,655

		Telecommunications - 3.1%
500,000		BellSouth Corp.
		6.88%, 10/15/31	A2	557,322
500,000		Nextel Communications, Inc.
		5.95%, 03/15/14	Baa2	511,834
400,000		SBC Communications, Inc.
		5.10%, 09/15/14	A2	396,366
680,000		Sprint Capital Corp.
		6.13%, 11/15/08	Baa2	706,128
120,000		Sprint Capital Corp.
		6.88%, 11/15/28	Baa2	132,561
450,000		Verizon Florida, Inc.
		6.13%, 01/15/13	A1	467,237
				2,771,448

		Transportation - 2.9%
900,000		CSX Transportation, Inc.
		6.30%, 03/15/12	Baa2	964,352
189,000		CSX Transportation, Inc.
		9.75%, 06/15/20	Baa2	264,248
261,000		Norfolk Southern Corp.
		9.75%, 06/15/20	Baa1	372,172

$	255,000	Union Pacific Corp.
		5.38%, 06/01/33	Baa2	$	244,882
380,000		Union Pacific Corp.
		6.50%, 04/15/12	Baa2	410,020
250,000		Union Pacific Corp.
		6.63%, 02/01/08	Baa2	260,376
				2,516,050

		Total Corporate Notes and Bonds
		(Cost $67,028,634)		67,722,463

Par Value			Moody’s Ratings	Value
ASSET-BACKED AND MORTGAGE-BACKED SECURITIES (g) - 4.7%

$	1,000,000	American Airlines, Inc., Pass-Through Trust, Series 1991 - C2
		9.73%, 09/29/14	Caa2	$	651,800
780,000		Bear Stearns Commercial Mortgage Securities, Inc., Series 2002-PBW1, Class A2, CMO
		4.72%, 11/11/35	Aaa	769,678
250,000		Bear Stearns Mortgage Securities, Inc., Series 1999-WF2, Class A2, CMO
		7.08%, 07/15/31	Aaa	267,585
150,000		Capital One Auto Finance Trust, Series 2003-A, Class A4A
		2.47%, 01/15/10	Aaa	147,263
300,000		Citibank Credit Card Issuance Trust, Series 2000-A3
		6.88%, 11/16/09	Aaa	314,259
710,000		General Electric Capital Commercial Mortgage Corp., Series 2002-1A, Class A3, CMO
		6.27%, 12/10/35	Aaa	759,719
500,000		GS Mortgage Securities Corp. II, Series 1997-GL, Class A2D, CMO
		6.94%, 07/13/30	Aaa	514,793
750,000		Morgan Stanley Dean Witter Capital I, Series 2003-T0P9, Class A2, CMO (e)
		4.74%, 11/13/36	AAA	740,043
		Total Asset-Backed and Mortgage-Backed Securities
		(Cost $4,593,993)		4,165,140

Par Value			Moody’s Ratings	Value
FOREIGN GOVERNMENT OBLIGATIONS (h) - 2.3%

$	450,000	Province of British Columbia
		5.38%, 10/29/08	Aa1	$	461,419
550,000		Province of Manitoba
		4.25%, 11/20/06	Aa2	549,367
500,000		Province of Quebec
		6.13%, 01/22/11	A1	534,864
450,000		Province of Quebec
		7.00%, 01/30/07	A1	464,508
		Total Foreign Government Obligations
		(Cost $1,963,762)		2,010,158

Par Value			Moody’s Ratings	Value
FOREIGN BONDS (h) - 11.4%

$	500,000	Alberta Energy Co., Ltd.
		7.38%, 11/01/31	Baa2	$	613,824
700,000		British Sky Broadcasting Group, Plc
		7.30%, 10/15/06	Baa2	718,223
450,000		British Telecom, Plc (f)
		8.13%, 12/15/10	Baa1	521,034
375,000		Burlington Resources Finance Co.
		7.40%, 12/01/31	Baa1	465,861
355,000		Canadian Pacific Ltd.
		9.45%, 08/01/21	Baa2	508,096
450,000		Canadian Pacific Railroad
		5.75%, 03/15/33	Baa2	465,888
500,000		Conoco Funding Co.
		7.25%, 10/15/31	A3	630,963
450,000		Diageo Capital, Plc
		3.50%, 11/19/07	A2	439,972
890,000		Domtar, Inc.
		5.38%, 12/01/13	Ba2	743,513
450,000		Norske Skog Canada, Ltd.
		7.38%, 03/01/14	Ba3	427,500
790,000		Royal Bank of Scotland Group, Plc
		4.70%, 07/03/18	Aa3	756,275
435,000		Stora Enso Oyj
		7.38%, 05/15/11	Baa1	478,770
900,000		Telecom Italia Capital SA
		5.25%, 10/01/15	Baa2	884,367
500,000		Telus Corp.
		7.50%, 06/01/07	Baa2	522,126
460,000		Tembec Industries, Inc.
		8.50%, 02/01/11	B3	300,150
490,000		Tyco International Group S.A.
		6.38%, 10/15/11	Baa3	522,282
450,000		Tyco International Group S.A.
		6.88%, 01/15/29	Baa3	516,363
500,000		Vodafone Group, Plc
		6.25%, 11/30/32	A2	539,237
		Total Foreign Bonds
		(Cost $9,888,012)		10,054,444

Shares			Moody’s Ratings	Value
INVESTMENT COMPANY - 0.3%

311,865		Marshall Money Market Fund	NR	$	311,865
		Total Investment Company
		(Cost $311,865)		311,865

Par Value			Moody’s Ratings	Value
SHORT TERM INVESTMENTS (i) (j) - 2.5%

$	78,400	Bank of America
		3.77%, 10/18/05	NR	$	78,400
78,400		Bank Of Montreal
		3.79%, 11/01/05	NR	78,400

$	78,400	Bank Of Nova Scotia
		3.77%, 10/31/05	NR	$	78,400
31,360		Barclays
		3.70%, 01/17/06	NR	31,360
47,040		Barclays
		3.71%, 10/14/05	NR	47,040
78,400		BNP Paribas
		3.75%, 10/28/05	NR	78,400
39,200		Citigroup
		3.63%, 10/31/05	NR	39,200
302,160		Credit Suisse First Boston Corporation Repurchase Agreement dated September 30, 2005, at 3.98%, due October 3, 2005 with a maturity amount of $302,260, collateralized by various corporate obligations with aggregate market value of $313,603.	NR	302,160
78,400		Fairway Finance
		3.77%, 10/06/05	NR	78,400
78,400		Fortis Bank
		3.81%, 10/07/05	NR	78,400
40,064		Goldman Sachs Group Inc.
		3.94%, 12/28/05	NR	40,064
96,342		Goldman Sachs Group, Inc. Repurchase Agreement dated September 30, 2005, at 3.98%, due October 3, 2005 with a maturity amount of $96,374, collateralized by various corporate obligations with aggregate market value of $97,875.	NR	96,342
78,400		Grampian Funding LLC
		3.76%, 10/13/05	NR	78,400
85,806		Lehman Brothers, Inc. Triparty Repurchase Agreement dated September 30, 2005, at 3.98%, due October 3, 2005 with a maturity amount of $85,834, collateralized by various corporate obligations with aggregate market value of $94,526.	NR	85,806
103,425		Merrill Lynch & Co. Repurchase Agreement dated September 30, 2005, at 3.98%, due October 3, 2005 with a maturity amount of $103,459, collateralized by various corporate obligations with aggregate market value of $106,426.	NR	103,425
62,034		Morgan Stanley Repurchase Agreement dated September 30, 2005, at 4.04%, due October 3, 2005 with a maturity amount of $62,055, collateralized by various corporate obligations with aggregate market value of $63,599.	NR	62,033
78,400		Paradigm Funding LLC
		3.75%, 10/17/05	NR	78,400
78,400		Ranger Funding
		3.79%, 10/25/05	NR	78,400

$	94,080	Royal Bank of Canada
		3.78%, 10/06/05	NR	$	94,080
78,400		Sheffiled Receivables Corp.
		3.76%, 10/06/05	NR	78,400
78,400		Societe Generale
		3.78%, 10/03/05	NR	78,400
110,878		Svenska Handlesbanken
		3.88%, 10/03/05	NR	110,878
78,400		The Bank of the West
		3.76%, 10/28/05	NR	78,400
39,200		Toronto Dominion Bank
		3.68%, 10/04/05	NR	39,200
78,400		UBS AG
		3.75%, 10/31/05	NR	78,400
78,400		Wachovia Bank NA
		3.76%, 10/25/05	NR	78,400
78,400		Wells Fargo
		3.77%, 10/19/05	NR	78,400
		Total Short Term Investments
		(Cost $2,227,588)		2,227,588

Total Investments - 101.0%
(Cost $88,775,976)				89,230,132
Net Other Assets and Liabilities - (1.0)%				(924,826		)
Total Net Assets - 100.0%				$	88,305,306

(a)		All or a poriton of this security is out on loan at September 30, 2005; the value of securities loaned amounted to $2,156,789.
(b)		Security is valued by management (Note 2).
(c)		Restricted Security - Represents ownership in a private placement investment which has not been registered with the Securities and Exchange Commission under the Securities Act of 1933. At September 30, 2005, these securities amounted to $112,757 or 0.1% of net assets.
(d)		Security exempt from registration under Rule 144A of the Securities Act of 1933. This security may be resold in transactions exempt from registration, to qualified institutional buyers. At September 30, 2005, these securities amounted to $4,349,104 or 4.9% of net assets.
(e)		Standard & Poor’s (S&P) credit ratings are used in the absence of a rating by Moody’s Investors, Inc.
(f)		Debt obligation initially issued in coupon form which converts to a higher coupon form at a specified date and rate. The rate shown is the rate at period end. The maturity date shown is the ultimate maturity.
(g)		Pass Through Certificates.
(h)		U.S. currency denominated.
(i)		Investments made with cash collateral received from securities on loan.
(j)		Effective yield at time of purchase, excluding repurchase agreements.

CMO		Collateralized Mortgage Obligation (Pay Through Certificate)
MTN		Medium Term Note
NR		Not Rated

Major Class Concentration of Investments

as a Percentage of Net Assets:

Corporate Notes And Bonds	76.7	%
Foreign Bonds	11.4
Asset-Backed And Mortgage-Backed Securities	4.7
U.S. Government Obligations	2.9
Short Term Investments	2.5
Foreign Government Obligations	2.3
Investment Companies	0.3
U.S. Government Agency Mortgage-Backed Obligation	0.2
Net Other Assets and Liabilities	(1.0	)
Total	100.0	%

FEDERAL INCOME TAX INFORMATION

At September 30, 2005, the aggregate cost of investment securities for tax purposes was $89,610,037. Net unrealized appreciation (depreciation) aggregated $(379,905), of which $1,147,001 related to appreciated investment securities and $(1,526,906) related to depreciated investment securities.

OTHER INFORMATION

The composition of ratings of both long-term and short-term debt holdings as a percentage of total value of investments in securities is as follows:

Moody’s Rating			S&P Ratings

Aaa	4.9	%	AAA	0.8	%
Aa	17.9	%
A	18.9	%
Baa	34.9	%
Ba	14.4	%
B	1.4	%
Caa	0.7	%
NR (Not Rated)	6.1	%

	99.2	%

NOTES TO PORTFOLIO OF INVESTMENTS

SECURITY VALUATION

Corporate debt securities and debt securities of the U.S. Government and its agencies (other than short-term investments) are valued using an independent pricing service approved by the Board of Trustees which utilizes market quotations and transactions, quotations from dealers and various relationships among securities in determining value. If not valued by a pricing service, such securities are valued at prices obtained from independent brokers. If prices are not readily available or do not accurately reflect fair value for a security, or if a security’s value has been materially affected by events occurring after the close of the exchange or market on which the security is principally traded, that security may be valued by another method that the Board of Trustees believes accurately reflects fair value. A security’s valuation may differ depending on the method used for determining value. Price movements in futures contracts, market and trading trends, the bid/ask quotes of brokers and off-exchange institutional trading may be reviewed in the course of making a good faith determination of a security’s fair value. Short-term investments that mature in 60 days or less are valued at amortized cost. This method involves valuing a portfolio security initially at its cost and thereafter assuming a constant amortization to maturity of any discount or premium. Investments in other investment companies are valued at net asset value.

At September 30, 2005, one security with a value of $112,757 or 0.1% of net assets was valued by management under the direction of the Board of Trustees.

SECURITIES LENDING

The Trust, using Investors Bank & Trust Company (“IBT”) as its lending agent, may loan securities to brokers and dealers in exchange for negotiated lenders’ fees. The Trust receives collateral against the loaned securities which must be maintained at not less than 102% of the market value of the loaned securities during the period of the loan. Collateral received is generally cash, and is invested in short-term investments. Lending portfolio securities involves possible delays in receiving additional collateral or in the recovery of the securities or possible loss of rights in the collateral should the counterparty (borrower) not meet its obligations under the terms of the loan. Information regarding the securities loaned and the collateral held at period end is included in a footnote at the end of the Trust’s portfolio of investments.

RESTRICTED SECURITIES

At September 30, 2005, the Trust owned the following restricted security constituting 0.1% of net assets, which may not be publicly sold without registration under the Securities Act of 1933. The Trust would bear the registration costs in connection with the disposition of restricted securities held in the portfolio. The Trust does not have the right to demand that such securities be registered. The disposal of restricted securities may involve time-consuming negotiations and expense; a prompt sale at an acceptable price may be difficult. The value of restricted securities is determined by valuations supplied by a pricing service or brokers or, if not available, in good faith by or at the direction of the Board of Trustees. Additional information on the restricted security is as follows:

Date of

Par

Cost at

Issuer

Acquisition

Amount

Acquisition

Value

Jones (Edward D.) & Co., LP

05/06/94

110,870

112,757

Item 2. Controls and Procedures.

(a) The registrant’s principal executive and principal financial officers have concluded that, based on their evaluation of the effectiveness of the registrant’s disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) as of a date within 90 days of the filing date of this report on Form N-Q, such disclosure controls and procedures provide reasonable assurances that material information relating to the registrant is made known to them by the appropriate persons.

(b) Changes to internal control over financial reporting: Not Applicable

Item 3. Exhibits.

Separate certifications by the registrant’s principal executive officer and principal financial officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 and as required by Rule 30a-2(a) under the Investment Company Act of 1940, are attached hereto as Exhibit 3.

Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Allmerica Securities Trust

By:	/s/ John P. Kavanaugh
	John P. Kavanaugh
	President and Chairman

Date:	November 17, 2005

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By:	/s/ John P. Kavanaugh
	John P. Kavanaugh
	President and Chairman
	(Principal Executive Officer)

Date:	November 17, 2005


By:	/s/ Paul S. Bellany
	Paul S. Bellany
	Assistant Vice President and Treasurer
	(Principal Financial Officer)

Date:	November 17, 2005