Magenta Therapeutics Inc (MGTA)

Healthcare Pharmaceuticals & Medical Research Biotechnology & Medical Research

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Ticker: MGTA Exchange: NMS

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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale

Past 90 days

Value bought

Value sold

Net insiders buying

Trades (buy and sell)

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PS: Planned sale, O: Option / Other

Notification date	Transaction date	B/S Transaction type	Insider and/or position	Nb. shares Price Value	Number of shares	Price	Total value
2023-10-03	2023-09-29	B Purchase	Fairmount Funds Management LLC Non-Executive Director Large shareholder	24,670 +1.3% 13.63 336,252 USD	24,670 +1.3%	13.63	336,252 USD
2023-09-28	2023-09-26	B Purchase	Fairmount Funds Management LLC Non-Executive Director Large shareholder	30,000 +1.6% 13.15 394,500 USD	30,000 +1.6%	13.15	394,500 USD
2023-09-25	2023-09-22	B Purchase	Randhawa Simrat Chief Medical Officer Officer	2,000 +100.0% 13.20 26,400 USD	2,000 +100.0%	13.20	26,400 USD
2023-09-25	2023-09-21	B Purchase	Randhawa Simrat Chief Medical Officer Officer	2,000 +inf% 13.20 26,400 USD	2,000 +inf%	13.20	26,400 USD
2023-09-21	2023-09-19	B Purchase	Fairmount Funds Management LLC Non-Executive Director Large shareholder	30,000 +1.6% 13.20 396,000 USD	30,000 +1.6%	13.20	396,000 USD
2023-09-13	2023-09-13	B Purchase	Fairmount Funds Management LLC Non-Executive Director Large shareholder	9,367 +0.5% 11.76 110,156 USD	9,367 +0.5%	11.76	110,156 USD
2023-09-13	2023-09-12	B Purchase	Fairmount Funds Management LLC Non-Executive Director Large shareholder	14,887 +0.8% 10.85 161,524 USD	14,887 +0.8%	10.85	161,524 USD
2023-02-09	2023-02-08	S Sale	Third Rock Ventures IV, L.P. Large shareholder	1,500,000 -32.9% 0.82 1,230,000 USD	1,500,000 -32.9%	0.82	1,230,000 USD
2023-02-09	2023-02-07	S Sale	Third Rock Ventures IV, L.P. Large shareholder	2,200,000 -32.6% 0.83 1,826,000 USD	2,200,000 -32.6%	0.83	1,826,000 USD
2020-07-01	2020-06-29	B Purchase	Booth Bruce Non-Executive Director	1,250,000 +inf% 8.00 10,000,000 USD	1,250,000 +inf%	8.00	10,000,000 USD
2020-01-10	2020-01-10	PS Planned sale	GARDNER JASON See Remarks	11,200 -4.3% 15.25 170,800 USD	11,200 -4.3%	15.25	170,800 USD
2020-01-03	2020-01-02	PS Planned sale	GARDNER JASON See Remarks	2,800 -1.1% 15.10 42,280 USD	2,800 -1.1%	15.10	42,280 USD
2020-01-03	2020-01-02	PS Planned sale	DAVIS JOHN C. JR Chief Medical Officer	11,294 -57.6% 15.04 169,817 USD	11,294 -57.6%	15.04	169,817 USD
2019-12-26	2019-12-24	PS Planned sale	ISACSON CHRISTINA K. Chief Business Officer	4,463 -5.1% 16.01 71,453 USD	4,463 -5.1%	16.01	71,453 USD
2019-12-26	2019-12-24	PS Planned sale	ZDRAVESKI ZORAN See Remarks	7,902 -5.8% 16.00 126,432 USD	7,902 -5.8%	16.00	126,432 USD
2019-12-26	2019-12-23	PS Planned sale	ZDRAVESKI ZORAN See Remarks	4,181 -3.0% 16.03 67,021 USD	4,181 -3.0%	16.03	67,021 USD
2019-12-26	2019-12-23	PS Planned sale	ISACSON CHRISTINA K. Chief Business Officer	9,867 -10.1% 16.03 158,168 USD	9,867 -10.1%	16.03	158,168 USD
2019-12-23	2019-12-23	PS Planned sale	GARDNER JASON See Remarks	2,897 -1.1% 15.10 43,755 USD	2,897 -1.1%	15.10	43,755 USD
2019-12-20	2019-12-20	PS Planned sale	GARDNER JASON See Remarks	76,711 -22.2% 15.16 1,162,617 USD	76,711 -22.2%	15.16	1,162,617 USD
2019-12-20	2019-12-20	PS Planned sale	DAVIS JOHN C. JR Chief Medical Officer	919 -10.0% 15.00 13,785 USD	919 -10.0%	15.00	13,785 USD
2019-12-13	2019-12-10	PS Planned sale	GARDNER JASON See Remarks	4,392 -1.3% 15.10 66,319 USD	4,392 -1.3%	15.10	66,319 USD
2019-12-11	2019-12-10	PS Planned sale	DAVIS JOHN C. JR Chief Medical Officer	17,055 -67.3% 15.00 255,825 USD	17,055 -67.3%	15.00	255,825 USD
2019-12-11	2019-12-09	PS Planned sale	DAVIS JOHN C. JR Chief Medical Officer	4,614 -35.7% 15.00 69,210 USD	4,614 -35.7%	15.00	69,210 USD
2019-12-02	2019-12-02	S Sale	COOKE MICHAEL P. Chief Scientific Officer	2,500 -1.0% 13.21 33,036 USD	2,500 -1.0%	13.21	33,036 USD
2019-12-02	2019-12-02	S Sale	COOKE MICHAEL P. Chief Scientific Officer	1,373 -0.6% 13.31 18,279 USD	1,373 -0.6%	13.31	18,279 USD
2019-12-02	2019-12-02	S Sale	COOKE MICHAEL P. Chief Scientific Officer	3,627 -1.5% 12.74 46,205 USD	3,627 -1.5%	12.74	46,205 USD
2019-11-25	2019-11-20	S Sale	COOKE MICHAEL P. Chief Scientific Officer	5,000 -2.0% 12.00 60,000 USD	5,000 -2.0%	12.00	60,000 USD
2019-11-01	2019-11-01	S Sale	COOKE MICHAEL P. Chief Scientific Officer	5,000 -1.9% 10.67 53,334 USD	5,000 -1.9%	10.67	53,334 USD
2019-10-03	2019-10-01	S Sale	COOKE MICHAEL P. Chief Scientific Officer	5,000 -1.9% 10.01 50,064 USD	5,000 -1.9%	10.01	50,064 USD
2019-09-19	2019-09-19	PS Planned sale	COOKE MICHAEL P. Chief Scientific Officer	1,656 -0.6% 12.00 19,872 USD	1,656 -0.6%	12.00	19,872 USD
2019-09-16	2019-09-12	PS Planned sale	COOKE MICHAEL P. Chief Scientific Officer	844 -0.3% 12.00 10,128 USD	844 -0.3%	12.00	10,128 USD
2019-09-04	2019-09-03	PS Planned sale	COOKE MICHAEL P. Chief Scientific Officer	5,000 -1.8% 10.11 50,531 USD	5,000 -1.8%	10.11	50,531 USD
2019-08-01	2019-08-01	PS Planned sale	COOKE MICHAEL P. Chief Scientific Officer	2,500 -0.9% 13.41 33,523 USD	2,500 -0.9%	13.41	33,523 USD
2019-08-01	2019-08-01	PS Planned sale	COOKE MICHAEL P. Chief Scientific Officer	5,000 -1.8% 13.42 67,109 USD	5,000 -1.8%	13.42	67,109 USD
2019-07-02	2019-07-01	PS Planned sale	COOKE MICHAEL P. Chief Scientific Officer	2,500 -0.9% 14.42 36,051 USD	2,500 -0.9%	14.42	36,051 USD
2019-07-02	2019-07-01	PS Planned sale	COOKE MICHAEL P. Chief Scientific Officer	5,000 -1.8% 14.39 71,933 USD	5,000 -1.8%	14.39	71,933 USD
2019-06-24	2019-06-21	PS Planned sale	ISACSON CHRISTINA K. Chief Business Officer	5,415 -5.2% 16.07 87,019 USD	5,415 -5.2%	16.07	87,019 USD
2019-06-24	2019-06-21	PS Planned sale	GARDNER JASON See Remarks	12,331 -3.4% 15.11 186,321 USD	12,331 -3.4%	15.11	186,321 USD
2019-06-24	2019-06-20	PS Planned sale	GARDNER JASON See Remarks	1,669 -0.5% 15.10 25,202 USD	1,669 -0.5%	15.10	25,202 USD
2019-06-18	2019-06-17	PS Planned sale	COOKE MICHAEL P. Chief Scientific Officer	7,500 -2.6% 13.90 104,267 USD	7,500 -2.6%	13.90	104,267 USD
2019-03-22	2019-03-20	S Sale	Booth Bruce	14,245 -100.0% 17.86 254,416 USD	14,245 -100.0%	17.86	254,416 USD
2019-03-22	2019-03-20	S Sale	Atlas Venture Fund X, L.P. Large shareholder	14,245 -100.0% 17.86 254,416 USD	14,245 -100.0%	17.86	254,416 USD
2018-06-27	2018-06-25	B Purchase	GARDNER JASON See Remarks Executive Director	400 +0.1% 15.00 6,000 USD	400 +0.1%	15.00	6,000 USD
2018-06-27	2018-06-25	B Purchase	Scadden David Non-Executive Director	6,600 +3.0% 15.00 99,000 USD	6,600 +3.0%	15.00	99,000 USD