ACS Actividades de Construccion y Servicios S A : Share buy-back, stabilisation and treasury stock programmes

ACS Actividades de Construcción y Servicios S.A. N.I.F A28004885

Avenida de Pío XII, 102 28036 Madrid

English translation for information purposes only. In the event of a discrepancy, the Spanish-language version prevails.

Madrid, 17 December 2020

Dear Sirs.:

Pursuant to article 227 of the Consolidated Text of the Spanish Securities Market Act (Texto Refundido de la Ley del Mercado de Valores), ACS Actividades de Construcción y Servicios S.A. (the "Company" or "ACS"), reports on the following:

OTHER RELEVANT INFORMATION

Reference is made to our notices to CNMV of other relevant information of 24 February 2020 (official registry number 218), 25 May 2020 (official registry number 2402), 23 June 2020 (official registry number 2953) and 14 August 2020 (official registry number 4065) relating to the buy-back programme of own shares approved by the Board of Directors of ACS on 24 February 2020, (the "Buy-backProgramme").

Pursuant to articles 2.2 and 2.3 of Commission Delegated Regulation (EU) 2016/1052, of 8 March 2016, supplementing Regulation (EU) No 596/2014, of the European Parliament and of the Council, with regard to regulatory technical standards for the conditions applicable to buy-back programmes and stabilization measures, we hereby inform you that during the days 10 and 14 December 2020, the Company has carried out the following transactions over its own shares under the Buy-back Programme:

Date	Security	Trading Venue	Number of Shares	Weighted Avarage	Intermediary
Price (€)
10/12/2020	ACS. MC	XMAD	117.844	26,605	SOCIETE GENERALE
10/12/2020	ACS. MC	BTE	11.595	26,617	SOCIETE GENERALE
10/12/2020	ACS. MC	CIX	21.823	26,616	SOCIETE GENERALE
10/12/2020	ACS. MC	AQU	9.866	26,624	SOCIETE GENERALE
10/12/2020	ACS. MC	TRQ	2.256	26,630	SOCIETE GENERALE
14/12/2020	ACS. MC	XMAD	69.251	26,582	SOCIETE GENERALE
14/12/2020	ACS. MC	AQU	8.000	26,587	SOCIETE GENERALE
14/12/2020	ACS. MC	TRQ	1.181	26,563	SOCIETE GENERALE

Detailed information of the transactions carried out within the referred period attached as annex.

Sincerely,

José Luis del Valle Pérez

Board member - Secretary General

ACS Actividades de Construcción y Servicios S.A. - N.I.F A28004885 Avenida de Pío XII, 102 - 28036 Madrid

Value: ACS.MC

Intermediary: SOCIETE GENERALE

Date	Trading venue	Number of shares	Price € / share
10/12/2020	XMAD	65	26,600
10/12/2020	XMAD	37	26,600
10/12/2020	XMAD	3	26,600
10/12/2020	XMAD	150	26,600
10/12/2020	XMAD	68	26,600
10/12/2020	XMAD	82	26,600
10/12/2020	CIX	58	26,600
10/12/2020	CIX	13	26,610
10/12/2020	CIX	42	26,610
10/12/2020	XMAD	450	26,610
10/12/2020	XMAD	288	26,650
10/12/2020	XMAD	50	26,720
10/12/2020	XMAD	82	26,720
10/12/2020	XMAD	29	26,720
10/12/2020	XMAD	191	26,720
10/12/2020	XMAD	48	26,720
10/12/2020	CIX	73	26,730
10/12/2020	XMAD	187	26,730
10/12/2020	AQU	162	26,740
10/12/2020	XMAD	194	26,730
10/12/2020	XMAD	4	26,730
10/12/2020	XMAD	47	26,730
10/12/2020	XMAD	203	26,730
10/12/2020	AQU	55	26,730
10/12/2020	CIX	3	26,730
10/12/2020	CIX	100	26,730
10/12/2020	XMAD	11	26,730
10/12/2020	CIX	108	26,720
10/12/2020	BTE	68	26,720
10/12/2020	XMAD	150	26,720
10/12/2020	XMAD	5	26,720
10/12/2020	CIX	116	26,720
10/12/2020	XMAD	150	26,720
10/12/2020	XMAD	72	26,720
10/12/2020	XMAD	23	26,720
10/12/2020	XMAD	59	26,730
10/12/2020	XMAD	62	26,720
10/12/2020	XMAD	46	26,730
10/12/2020	XMAD	193	26,730
10/12/2020	XMAD	112	26,730
10/12/2020	XMAD	165	26,730
10/12/2020	XMAD	150	26,730
10/12/2020	XMAD	119	26,730
10/12/2020	XMAD	150	26,730
10/12/2020	XMAD	37	26,730
10/12/2020	XMAD	17	26,730
10/12/2020	XMAD	29	26,730
10/12/2020	XMAD	215	26,730
10/12/2020	XMAD	29	26,730
10/12/2020	XMAD	249	26,730
10/12/2020	XMAD	61	26,730
10/12/2020	XMAD	195	26,730
10/12/2020	AQU	50	26,730
10/12/2020	XMAD	51	26,730
10/12/2020	XMAD	1	26,730
10/12/2020	BTE	34	26,730
10/12/2020	AQU	70	26,730
10/12/2020	CIX	117	26,730
10/12/2020	CIX	2	26,730
10/12/2020	BTE	4	26,730
10/12/2020	BTE	30	26,730
10/12/2020	CIX	33	26,730
10/12/2020	BTE	7	26,730
10/12/2020	BTE	27	26,730
10/12/2020	XMAD	75	26,730
10/12/2020	XMAD	109	26,730
10/12/2020	XMAD	76	26,730
10/12/2020	XMAD	13	26,730
10/12/2020	XMAD	150	26,730
10/12/2020	XMAD	93	26,730
10/12/2020	XMAD	192	26,730
10/12/2020	TRQ	15	26,730
10/12/2020	XMAD	232	26,730
10/12/2020	BTE	21	26,730
10/12/2020	BTE	47	26,730
10/12/2020	CIX	11	26,730
10/12/2020	CIX	52	26,730
10/12/2020	XMAD	150	26,730
10/12/2020	XMAD	150	26,730
10/12/2020	XMAD	165	26,730

Date	Trading venue	Number of shares	Price € / share
10/12/2020	CIX	42	26,730
10/12/2020	CIX	80	26,720
10/12/2020	BTE	89	26,720
10/12/2020	CIX	98	26,720
10/12/2020	XMAD	174	26,720
10/12/2020	CIX	146	26,710
10/12/2020	AQU	62	26,710
10/12/2020	XMAD	230	26,710
10/12/2020	XMAD	66	26,710
10/12/2020	XMAD	55	26,710
10/12/2020	XMAD	220	26,710
10/12/2020	XMAD	21	26,710
10/12/2020	AQU	90	26,700
10/12/2020	XMAD	97	26,700
10/12/2020	XMAD	200	26,700
10/12/2020	XMAD	115	26,700
10/12/2020	XMAD	35	26,700
10/12/2020	XMAD	179	26,700
10/12/2020	XMAD	81	26,700
10/12/2020	TRQ	28	26,700
10/12/2020	BTE	10	26,710
10/12/2020	BTE	46	26,710
10/12/2020	AQU	48	26,690
10/12/2020	XMAD	44	26,700
10/12/2020	CIX	34	26,700
10/12/2020	CIX	20	26,700
10/12/2020	XMAD	142	26,710
10/12/2020	CIX	83	26,700
10/12/2020	XMAD	142	26,710
10/12/2020	AQU	60	26,690
10/12/2020	XMAD	200	26,690
10/12/2020	CIX	46	26,700
10/12/2020	BTE	58	26,720
10/12/2020	XMAD	149	26,730
10/12/2020	XMAD	4	26,730
10/12/2020	XMAD	146	26,730
10/12/2020	CIX	164	26,720
10/12/2020	XMAD	201	26,720
10/12/2020	CIX	57	26,720
10/12/2020	CIX	120	26,720
10/12/2020	XMAD	208	26,730
10/12/2020	XMAD	1	26,730
10/12/2020	XMAD	189	26,730
10/12/2020	XMAD	67	26,730
10/12/2020	XMAD	3	26,730
10/12/2020	CIX	136	26,730
10/12/2020	XMAD	4	26,730
10/12/2020	XMAD	75	26,730
10/12/2020	XMAD	147	26,730
10/12/2020	XMAD	17	26,730
10/12/2020	XMAD	130	26,730
10/12/2020	XMAD	76	26,730
10/12/2020	XMAD	244	26,730
10/12/2020	AQU	62	26,730
10/12/2020	BTE	48	26,720
10/12/2020	XMAD	190	26,720
10/12/2020	XMAD	16	26,720
10/12/2020	CIX	20	26,710
10/12/2020	CIX	35	26,710
10/12/2020	CIX	23	26,710
10/12/2020	CIX	22	26,710
10/12/2020	AQU	150	26,720
10/12/2020	XMAD	224	26,720
10/12/2020	XMAD	150	26,710
10/12/2020	XMAD	74	26,720
10/12/2020	XMAD	224	26,710
10/12/2020	XMAD	182	26,710
10/12/2020	XMAD	42	26,720
10/12/2020	XMAD	37	26,720
10/12/2020	XMAD	187	26,720
10/12/2020	XMAD	220	26,720
10/12/2020	XMAD	4	26,720
10/12/2020	BTE	4	26,720
10/12/2020	BTE	119	26,720
10/12/2020	XMAD	64	26,720
10/12/2020	XMAD	326	26,720
10/12/2020	XMAD	69	26,720
10/12/2020	XMAD	150	26,720
10/12/2020	XMAD	59	26,720
10/12/2020	XMAD	95	26,720

ACS Actividades de Construcción y Servicios S.A. - N.I.F A28004885 Avenida de Pío XII, 102 - 28036 Madrid

Value: ACS.MC

Intermediary: SOCIETE GENERALE

Date	Trading venue	Number of shares	Price € / share
10/12/2020	CIX	60	26,720
10/12/2020	CIX	25	26,720
10/12/2020	CIX	9	26,720
10/12/2020	TRQ	131	26,710
10/12/2020	CIX	98	26,710
10/12/2020	XMAD	66	26,710
10/12/2020	BTE	100	26,720
10/12/2020	BTE	4	26,720
10/12/2020	BTE	22	26,720
10/12/2020	BTE	99	26,720
10/12/2020	BTE	23	26,720
10/12/2020	BTE	55	26,700
10/12/2020	BTE	93	26,700
10/12/2020	CIX	117	26,700
10/12/2020	BTE	7	26,700
10/12/2020	XMAD	75	26,660
10/12/2020	CIX	8	26,660
10/12/2020	CIX	60	26,660
10/12/2020	XMAD	23	26,650
10/12/2020	XMAD	42	26,660
10/12/2020	AQU	57	26,660
10/12/2020	XMAD	119	26,650
10/12/2020	XMAD	42	26,650
10/12/2020	XMAD	97	26,650
10/12/2020	BTE	76	26,670
10/12/2020	CIX	113	26,660
10/12/2020	XMAD	166	26,660
10/12/2020	XMAD	26	26,660
10/12/2020	CIX	80	26,660
10/12/2020	XMAD	200	26,660
10/12/2020	XMAD	168	26,660
10/12/2020	XMAD	39	26,660
10/12/2020	AQU	45	26,660
10/12/2020	XMAD	267	26,650
10/12/2020	XMAD	150	26,650
10/12/2020	XMAD	77	26,640
10/12/2020	AQU	43	26,640
10/12/2020	XMAD	149	26,630
10/12/2020	XMAD	79	26,600
10/12/2020	XMAD	18	26,580
10/12/2020	CIX	152	26,580
10/12/2020	XMAD	161	26,580
10/12/2020	XMAD	32	26,560
10/12/2020	CIX	75	26,560
10/12/2020	XMAD	216	26,560
10/12/2020	XMAD	146	26,550
10/12/2020	AQU	50	26,550
10/12/2020	BTE	4	26,560
10/12/2020	BTE	74	26,560
10/12/2020	TRQ	10	26,550
10/12/2020	TRQ	52	26,550
10/12/2020	XMAD	199	26,550
10/12/2020	AQU	60	26,550
10/12/2020	XMAD	173	26,550
10/12/2020	XMAD	14	26,580
10/12/2020	XMAD	132	26,580
10/12/2020	XMAD	68	26,580
10/12/2020	XMAD	35	26,580
10/12/2020	XMAD	75	26,560
10/12/2020	CIX	33	26,560
10/12/2020	CIX	38	26,560
10/12/2020	CIX	42	26,560
10/12/2020	XMAD	78	26,540
10/12/2020	AQU	47	26,550
10/12/2020	CIX	71	26,540
10/12/2020	BTE	106	26,540
10/12/2020	XMAD	199	26,540
10/12/2020	XMAD	150	26,540
10/12/2020	XMAD	4	26,540
10/12/2020	BTE	52	26,530
10/12/2020	XMAD	133	26,530
10/12/2020	BTE	15	26,530
10/12/2020	BTE	15	26,530
10/12/2020	BTE	37	26,530
10/12/2020	XMAD	103	26,530
10/12/2020	AQU	58	26,540
10/12/2020	TRQ	4	26,550
10/12/2020	XMAD	75	26,530
10/12/2020	CIX	125	26,530
10/12/2020	XMAD	166	26,520

Date	Trading venue	Number of shares	Price € / share
10/12/2020	XMAD	126	26,520
10/12/2020	XMAD	78	26,510
10/12/2020	CIX	102	26,540
10/12/2020	XMAD	111	26,540
10/12/2020	XMAD	48	26,540
10/12/2020	XMAD	96	26,540
10/12/2020	XMAD	111	26,540
10/12/2020	XMAD	116	26,560
10/12/2020	XMAD	92	26,560
10/12/2020	AQU	44	26,540
10/12/2020	XMAD	388	26,520
10/12/2020	XMAD	79	26,520
10/12/2020	CIX	84	26,520
10/12/2020	XMAD	81	26,520
10/12/2020	XMAD	30	26,520
10/12/2020	XMAD	139	26,520
10/12/2020	XMAD	29	26,520
10/12/2020	AQU	54	26,520
10/12/2020	TRQ	75	26,500
10/12/2020	CIX	123	26,490
10/12/2020	BTE	71	26,450
10/12/2020	BTE	24	26,450
10/12/2020	BTE	8	26,450
10/12/2020	BTE	35	26,450
10/12/2020	AQU	86	26,450
10/12/2020	XMAD	58	26,440
10/12/2020	XMAD	14	26,440
10/12/2020	BTE	83	26,480
10/12/2020	AQU	56	26,500
10/12/2020	XMAD	47	26,500
10/12/2020	XMAD	195	26,500
10/12/2020	XMAD	82	26,520
10/12/2020	XMAD	68	26,520
10/12/2020	XMAD	34	26,520
10/12/2020	XMAD	64	26,520
10/12/2020	XMAD	63	26,520
10/12/2020	XMAD	146	26,520
10/12/2020	XMAD	46	26,520
10/12/2020	XMAD	17	26,520
10/12/2020	XMAD	68	26,520
10/12/2020	XMAD	173	26,520
10/12/2020	XMAD	225	26,520
10/12/2020	BTE	117	26,500
10/12/2020	XMAD	127	26,500
10/12/2020	XMAD	235	26,500
10/12/2020	XMAD	232	26,500
10/12/2020	BTE	36	26,500
10/12/2020	BTE	48	26,500
10/12/2020	BTE	84	26,500
10/12/2020	XMAD	77	26,500
10/12/2020	XMAD	35	26,500
10/12/2020	XMAD	215	26,500
10/12/2020	XMAD	35	26,500
10/12/2020	AQU	56	26,500
10/12/2020	AQU	49	26,490
10/12/2020	XMAD	150	26,480
10/12/2020	BTE	51	26,480
10/12/2020	CIX	52	26,490
10/12/2020	CIX	90	26,490
10/12/2020	CIX	15	26,480
10/12/2020	XMAD	129	26,480
10/12/2020	XMAD	36	26,470
10/12/2020	XMAD	236	26,470
10/12/2020	TRQ	4	26,480
10/12/2020	AQU	59	26,480
10/12/2020	CIX	105	26,480
10/12/2020	XMAD	76	26,480
10/12/2020	XMAD	255	26,460
10/12/2020	CIX	30	26,480
10/12/2020	CIX	67	26,480
10/12/2020	XMAD	144	26,480
10/12/2020	CIX	67	26,480
10/12/2020	CIX	30	26,480
10/12/2020	CIX	97	26,480
10/12/2020	AQU	86	26,470
10/12/2020	BTE	92	26,460
10/12/2020	XMAD	245	26,460
10/12/2020	XMAD	306	26,460
10/12/2020	XMAD	105	26,460
10/12/2020	XMAD	395	26,460

ACS Actividades de Construcción y Servicios S.A. - N.I.F A28004885 Avenida de Pío XII, 102 - 28036 Madrid

Value: ACS.MC

Intermediary: SOCIETE GENERALE

Date	Trading venue	Number of shares	Price € / share
10/12/2020	XMAD	80	26,460
10/12/2020	XMAD	498	26,460
10/12/2020	XMAD	2	26,460
10/12/2020	CIX	112	26,440
10/12/2020	CIX	14	26,440
10/12/2020	CIX	55	26,440
10/12/2020	CIX	10	26,440
10/12/2020	XMAD	192	26,420
10/12/2020	XMAD	508	26,420
10/12/2020	XMAD	215	26,420
10/12/2020	XMAD	87	26,420
10/12/2020	XMAD	498	26,420
10/12/2020	AQU	94	26,420
10/12/2020	TRQ	68	26,430
10/12/2020	BTE	42	26,410
10/12/2020	BTE	33	26,410
10/12/2020	CIX	52	26,410
10/12/2020	CIX	14	26,410
10/12/2020	CIX	87	26,410
10/12/2020	CIX	135	26,400
10/12/2020	BTE	23	26,400
10/12/2020	BTE	113	26,400
10/12/2020	AQU	94	26,410
10/12/2020	BTE	53	26,400
10/12/2020	AQU	2	26,410
10/12/2020	CIX	75	26,400
10/12/2020	CIX	76	26,420
10/12/2020	CIX	92	26,420
10/12/2020	XMAD	500	26,420
10/12/2020	XMAD	74	26,420
10/12/2020	XMAD	8	26,420
10/12/2020	XMAD	88	26,420
10/12/2020	XMAD	112	26,420
10/12/2020	XMAD	42	26,420
10/12/2020	XMAD	130	26,420
10/12/2020	XMAD	149	26,420
10/12/2020	XMAD	216	26,420
10/12/2020	XMAD	160	26,420
10/12/2020	XMAD	191	26,420
10/12/2020	XMAD	160	26,420
10/12/2020	XMAD	191	26,420
10/12/2020	AQU	75	26,430
10/12/2020	XMAD	18	26,420
10/12/2020	XMAD	108	26,420
10/12/2020	BTE	7	26,420
10/12/2020	XMAD	23	26,420
10/12/2020	CIX	81	26,400
10/12/2020	AQU	9	26,400
10/12/2020	AQU	96	26,400
10/12/2020	CIX	75	26,390
10/12/2020	TRQ	66	26,400
10/12/2020	AQU	45	26,390
10/12/2020	CIX	27	26,400
10/12/2020	CIX	108	26,400
10/12/2020	XMAD	150	26,390
10/12/2020	XMAD	85	26,390
10/12/2020	XMAD	765	26,390
10/12/2020	XMAD	109	26,380
10/12/2020	XMAD	151	26,380
10/12/2020	XMAD	17	26,380
10/12/2020	AQU	77	26,390
10/12/2020	CIX	100	26,380
10/12/2020	XMAD	300	26,380
10/12/2020	XMAD	150	26,380
10/12/2020	XMAD	273	26,380
10/12/2020	CIX	69	26,370
10/12/2020	BTE	1	26,380
10/12/2020	XMAD	69	26,370
10/12/2020	XMAD	147	26,370
10/12/2020	XMAD	102	26,370
10/12/2020	BTE	4	26,380
10/12/2020	BTE	100	26,380
10/12/2020	BTE	100	26,380
10/12/2020	AQU	87	26,380
10/12/2020	CIX	84	26,370
10/12/2020	XMAD	182	26,370
10/12/2020	XMAD	2	26,370
10/12/2020	XMAD	50	26,370
10/12/2020	XMAD	448	26,370
10/12/2020	XMAD	380	26,370

Date	Trading venue	Number of shares	Price € / share
10/12/2020	XMAD	191	26,370
10/12/2020	XMAD	120	26,370
10/12/2020	XMAD	102	26,370
10/12/2020	XMAD	103	26,370
10/12/2020	XMAD	104	26,370
10/12/2020	XMAD	450	26,370
10/12/2020	XMAD	18	26,370
10/12/2020	XMAD	344	26,370
10/12/2020	XMAD	126	26,370
10/12/2020	XMAD	190	26,370
10/12/2020	XMAD	52	26,370
10/12/2020	XMAD	440	26,370
10/12/2020	XMAD	124	26,370
10/12/2020	XMAD	249	26,370
10/12/2020	XMAD	350	26,370
10/12/2020	XMAD	85	26,370
10/12/2020	XMAD	72	26,370
10/12/2020	XMAD	400	26,370
10/12/2020	XMAD	100	26,370
10/12/2020	CIX	86	26,360
10/12/2020	CIX	13	26,360
10/12/2020	CIX	86	26,360
10/12/2020	TRQ	6	26,360
10/12/2020	BTE	13	26,360
10/12/2020	BTE	34	26,350
10/12/2020	BTE	46	26,350
10/12/2020	BTE	92	26,340
10/12/2020	BTE	8	26,340
10/12/2020	BTE	68	26,340
10/12/2020	BTE	18	26,340
10/12/2020	AQU	64	26,310
10/12/2020	TRQ	60	26,310
10/12/2020	CIX	76	26,350
10/12/2020	XMAD	75	26,340
10/12/2020	BTE	72	26,330
10/12/2020	CIX	76	26,340
10/12/2020	XMAD	209	26,350
10/12/2020	XMAD	64	26,350
10/12/2020	CIX	70	26,340
10/12/2020	XMAD	92	26,340
10/12/2020	XMAD	150	26,340
10/12/2020	AQU	74	26,340
10/12/2020	XMAD	303	26,340
10/12/2020	AQU	34	26,380
10/12/2020	CIX	16	26,360
10/12/2020	CIX	78	26,360
10/12/2020	XMAD	77	26,370
10/12/2020	AQU	65	26,370
10/12/2020	BTE	7	26,370
10/12/2020	XMAD	54	26,370
10/12/2020	CIX	56	26,370
10/12/2020	BTE	22	26,370
10/12/2020	BTE	34	26,370
10/12/2020	CIX	76	26,380
10/12/2020	XMAD	152	26,380
10/12/2020	XMAD	27	26,380
10/12/2020	XMAD	87	26,380
10/12/2020	XMAD	150	26,380
10/12/2020	CIX	76	26,360
10/12/2020	XMAD	69	26,360
10/12/2020	BTE	74	26,350
10/12/2020	BTE	12	26,350
10/12/2020	XMAD	272	26,340
10/12/2020	XMAD	5	26,350
10/12/2020	XMAD	142	26,360
10/12/2020	XMAD	147	26,370
10/12/2020	XMAD	138	26,350
10/12/2020	XMAD	183	26,340
10/12/2020	TRQ	6	26,370
10/12/2020	BTE	129	26,400
10/12/2020	XMAD	237	26,400
10/12/2020	XMAD	116	26,400
10/12/2020	AQU	83	26,400
10/12/2020	AQU	82	26,400
10/12/2020	CIX	101	26,380
10/12/2020	XMAD	150	26,390
10/12/2020	XMAD	36	26,390
10/12/2020	XMAD	9	26,380
10/12/2020	TRQ	6	26,390
10/12/2020	XMAD	116	26,380