94E 机构投资人持股和股东祖拉生物有限公司 (DB) 股票

基本统计

机构股东	133 total, 133 long only, 0 short only, 0 long/short - change of -12.50% MRQ
平均投资组合配置	0.0293 % - change of -53.12% MRQ
已发行股票	shares (source: Capital IQ)

法人股（长期）	35,928,851 - 55.26% (ex 13D/G) - change of -12.28MM shares -25.47% MRQ
制度价值（长期）	$ 37,672 USD ($1000)

机构投资人持股和股东

Zura Bio Limited (DE:94E) 有 133 已向美国证券交易委员会（SEC）提交13D/G或13F表格的机构股东和股东。这些机构共持有 35,928,851 股股票。最大股东包括 Suvretta Capital Management, Llc, Jpmorgan Chase & Co, VR Adviser, LLC, Great Point Partners Llc, Pfizer Inc, Braidwell Lp, Point72 Asset Management, L.P., Deep Track Capital, LP, Armistice Capital, Llc, and ADAR1 Capital Management, LLC .

Zura Bio Limited (DB:94E)机构投资人持股结构显示了机构和基金在公司中的当前头寸，以及头寸规模的最新变化。主要股东可以包括个人投资者、共同基金、对冲基金或机构。附表13D表明投资者持有（或之前持有）公司5%以上的股份，并打算（或打算）积极寻求改变业务战略。附表13G表示消极投资超过5%。

DE:94E / Zura Bio Limited Institutional Ownership

基金情绪分数

基金情绪分数（fka 持股累积分数）找到基金买入最多的股票。它是复杂的多因素量化模型的结果，该模型确定了具有最高机构积累水平的公司。分数模型结合使用已披露持有人的总增长、这些持有人的投资组合配置变化以及其他指标。该数字的范围从 0 到 100，数字越大表示对等方的积累水平越高，50 是平均值。

更新频率：每日

请参阅“持股资源管理器”，它提供了排名最高的公司的列表。

查看排名最高的股票

13F和NPORT备案

关于13F备案的详细信息是免费的。NP备案的详细信息需要高级会员资格。绿色行表示新头寸。红色行表示平仓。点击链接图标查看完整的交易历史记录。

更新解锁高级数据并导出到Excel Premium Registration Required .

文件日期	来源	投资者	类型	股份	Δ 股份 (%)	报告价值 ($1000)	Δ 价值 (%)
2025-06-26	NP	贝莱德基金 - iShares Russell 中小型股指数基金投资者 A This fund is a listed as child fund of BlackRock, Inc. and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		5,749	0.00	9	-20.00
2025-05-22	NP	VVICX - Voya VACS 指数系列 SC 投资组合		4,064	0.00	5	-50.00
2025-08-14	13F	加拿大皇家银行		277	-57.05	0	-100.00
2025-06-23	NP	PPNMX - 小型股成长基金 I R-3		5,065	-5.40	8	-30.00
2025-08-14	13F	Point72 资产管理有限合伙人		2,350,000	0.00	2,468	-18.61
2025-08-14	13F	水手有限责任公司		16,383		17
2025-05-15	13F	博克瑟资本管理有限公司		0	-100.00	0	-100.00
2025-05-28	NP	Profunds - Profunds 小型股副总裁		114	-6.56	0
2025-08-14	13F	弗默尔有限公司		569,139	21,296.20	598	19,800.00
2025-07-29	NP	VRTTX - Vanguard Russell 3000 指数基金机构股票 This fund is a listed as child fund of Vanguard Group Inc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		3,461	0.00	3	-25.00
2025-08-08	13F	艾伯塔省投资管理公司		133,200		140
2025-08-12	13F	摩根大通公司		4,659,951	78.73	4,893	45.47
2025-08-14	13F	Aqr资本管理有限公司		156,291	180.58	164	130.99
2025-05-29	NP	RYRRX - 罗素 2000 基金 A 类		69	0.00	0
2025-08-12	13F	嘉信理财投资管理公司		169,180	-41.38	178	-52.42
2025-05-27	NP	哥伦比亚基金可变系列信托 II - 可变投资组合 - 合作伙伴小型股成长基金 1 级		6,578	1.65	8	-50.00
2025-07-24	NP	FSMAX - 富达扩展市场指数基金 This fund is a listed as child fund of Fmr Llc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		194,054	0.73	196	-25.29
2025-05-15	13F	魁北克加丁储蓄银行联合会		0	-100.00	0	-100.00
2025-08-07	13F	ProShare 顾问有限责任公司		0	-100.00	0
2025-07-29	NP	VRTIX - Vanguard Russell 2000 指数基金机构股票 This fund is a listed as child fund of Vanguard Group Inc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		244,291	9.15	247	-19.08
2025-08-14	13F	CIBC 世界市场公司		15,000		16
2025-08-13	13F	文艺复兴科技有限公司		204,133	-51.65	214	-60.66
2025-05-29	NP	RYDEX 可变信托 - Russell 2000(R) 1.5x 策略基金可变年金		9	0.00	0
2025-08-26	NP	EQ ADVISORS TRUST - EQ/摩根士丹利小型股成长投资组合 IB 级		1,131	-81.09	1	-85.71
2025-05-15	13F	Adage 资本合伙人有限公司		0	-100.00	0	-100.00
2025-05-28	NP	SSTIX - 道富总回报 VIS 基金 1 类股票 This fund is a listed as child fund of State Street Corp and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		1,528	0.00	2	-66.67
2025-08-14	13F	停战资本有限公司		1,536,000	0.00	1,613	-18.63
2025-08-28	NP	IWC - iShares 微型股 ETF This fund is a listed as child fund of BlackRock Inc. and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		110,305	0.20	116	-19.01
2025-08-08	13F	SBI 证券股份有限公司		234	-70.45	0	-100.00
2025-07-24	13F	IFP 顾问公司		0	-100.00	0
2025-08-04	13F	俄亥俄州		0	-100.00	0
2025-08-14	13F	未来资产全球ETFS控股有限公司		0	-100.00	0
2025-07-31	13F	尼萨投资顾问有限公司		1,206	76.32	1
2025-08-07	13F	阿卡迪亚资产管理有限公司		44,862		0
2025-08-14	13F	苏维塔资本管理有限公司		4,860,939	0.00	5,104	-18.61
2025-08-14	13F	伟大的点合作伙伴有限责任公司		3,170,194	0.00	3,329	-18.61
2025-08-14	13F	美国银行 /de/		9,948	-65.45	10	-72.97
2025-07-28	NP	HDG - ProShares 对冲复制 ETF		66	13.79	0
2025-08-27	NP	JNL 系列信托 - JNL/DFA 美国小型股基金 (A)		7,193	0.00	8	-22.22
2025-05-27	NP	FECGX - 富达小盘成长指数基金 This fund is a listed as child fund of Fmr Llc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		31,411	4.48	41	-46.67
2025-07-28	NP	ITWO - ProShares Russell 2000 高收益 ETF		857	-0.46	1	-100.00
2025-04-18	NP	AVSC - Avantis 美国小盘股 ETF This fund is a listed as child fund of American Century Companies Inc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		12,636	714.70	17	325.00
2025-08-26	NP	QUANTITATIVE MASTER SERIES LLC - Master 小盘股指数系列		8,353	-90.07	9	-92.59
2025-08-08	13F	哈特兰有限公司		239		0
2025-05-15	13F	字幕管理有限责任公司	Call	0	-100.00	0
2025-08-14	13F	Point72（迪拜国际金融中心）有限公司		601		1
2025-08-27	NP	BBGSX - Bridge Builder 中小型股成长基金		1,247	-89.72	1	-93.33
2025-05-15	13F	字幕管理有限责任公司		0	-100.00	0
2025-08-13	13F	北方信托公司		94,161	-74.51	99	-79.41
2025-08-14	13F	Citadel 顾问有限公司	Call	0	-100.00	0
2025-05-22	NP	PENN SERIES FUNDS INC - 小盘股指数基金		300	0.00	0
2025-08-14	13F	雷蒙德詹姆斯金融公司		114,191	-21.08	120	-36.02
2025-08-28	NP	BlackRock Variable Series Funds, Inc. - BlackRock Small Cap Index VI 基金 I 类 This fund is a listed as child fund of BlackRock, Inc. and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		570	-89.72	1	-100.00
2025-08-14	13F	瑞银集团		31,211	-46.97	33	-57.33
2025-05-14	13F	跳跃金融有限责任公司		0	-100.00	0
2025-05-27	NP	NSIDX - 北方小盘股指数基金		28,010	42.15	36	-26.53
2025-08-14	13F	高盛集团公司		302,691	146.14	318	100.63
2025-08-14	13F	富国银行/百万		385	-98.40	0	-100.00
2025-06-18	NP	GMRAX - 全国小盘指数基金 A 类		4,107	0.00	6	-14.29
2025-08-08	13F	新泽西州警察和消防员退休系统		0	-100.00	0
2025-05-22	NP	IRSIX - Voya Russell™ 小盘股指数投资组合 ADV 级		11,375	0.00	15	-50.00
2025-05-28	NP	Profunds - Profund 超小型股副总裁		182	-4.21	0
2025-06-18	13F/A	沃亚投资管理有限公司		15,439	0.00	20	-50.00
2025-06-24	NP	SWSSX - 嘉信小盘指数基金 This fund is a listed as child fund of Charles Schwab Investment Management Inc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		120,080	0.00	185	-18.22
2025-08-12	13F	普利股权公司		0		0
2025-08-14	13F	ADAR1 资本管理有限责任公司		997,547	-64.39	1,047	-71.02
2025-08-14	13F	Ra 资本管理有限公司		0	-100.00	0
2025-08-14	13F	普莱斯 T Rowe Associates Inc /md/		0	-100.00	0
2025-05-15	13F	Citadel 顾问有限公司		0	-100.00	0	-100.00
2025-08-14	13F/A	最前沿分析有限责任公司		63,985	-40.92	67	-51.80
2025-08-14	13F	萨斯奎哈纳国际集团有限责任公司		118,228	81.77	124	49.40
2025-08-05	13F	纽约梅隆银行		0	-100.00	0
2025-06-27	NP	SUNAMERICA SERIES TRUST - SA 小型股指数投资组合 1 级		5,731	4.83	9	-20.00
2025-05-14	13F	萨斯奎哈纳国际集团有限责任公司	Put	0	-100.00	0	-100.00
2025-08-13	13F	正交资本有限公司		15,158		16
2025-08-14	13F	简街集团有限责任公司		107,712		113
2025-08-12	13F	MAI资本管理		4,000	0.00	4	-20.00
2025-08-14	13F	立体派系统策略有限责任公司		21,504		23
2025-07-24	NP	FCFMX - 富达系列总市场指数基金 This fund is a listed as child fund of Fmr Llc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		49,659	5.40	50	-21.87
2025-05-15	13F	字幕管理有限责任公司	Put	0	-100.00	0
2025-08-26	NP	EQ ADVISORS TRUST - EQ/富兰克林小型股价值管理波动性投资组合 IB 类		286	-84.46	0	-100.00
2025-08-14	13F	Allostery 投资公司		0	-100.00	0
2025-05-29	NP	JAFEX - 总股票市场指数信托资产净值		1,163	12.37	2	-50.00
2025-08-08	13F	英泰投资管理有限公司		0	-100.00	0
2025-08-14	13F	深轨资本有限合伙人		1,727,562	-47.39	1,814	-57.20
2025-07-22	NP	DSMFX - 目的地中小型股票基金 I 类		1,239	0.00	1	0.00
2025-05-23	NP	EQ ADVISORS TRUST - EQ/AB 小型股成长投资组合 IB 类		9,510	0.00	12	-47.83
2025-08-12	13F	恒线顾问公司		0	-100.00	0
2025-07-28	NP	MSSM - 摩根士丹利 Pathway 中小型股 ETF		2,264	0.00	2	-33.33
2025-07-29	NP	VRTGX - Vanguard Russell 2000 增长指数基金机构股票 This fund is a listed as child fund of Vanguard Group Inc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		44,589	-1.56	45	-26.23
2025-08-14	13F	法国巴黎银行套利公司		15,560	68.38	16	45.45
2025-08-14	13F	VR 顾问有限责任公司		4,631,216	-7.80	4,863	-24.96
2025-08-11	13F	先锋集团公司		517,144	-38.59	543	-50.00
2025-08-14	13F	Point72 亚洲（新加坡）私人有限公司有限公司		30,553		32
2025-07-28	NP	URTY - ProShares UltraPro Russell2000		3,687	-26.86	4	-50.00
2025-07-23	13F	阿贝尔霍尔有限责任公司		13,343		14
2025-08-04	13F	联合银行		0	-100.00	0
2025-08-14	13F	布雷德韦尔有限合伙人		2,472,806	0.00	2,596	-18.60
2025-05-23	NP	EQ ADVISORS TRUST - EQ/小型公司指数投资组合 IB 类		11,200	0.00	14	-50.00
2025-08-15	13F	塔尔研究资本有限责任公司（TRC）		22,029	180.70	23	130.00
2025-06-26	NP	TISBX - TIAA-CREF 小型股混合指数基金机构类别		58,961	0.00	91	-18.18
2025-05-15	13F	超弦资本管理有限公司		0	-100.00	0
2025-07-31	13F	R平方有限公司		10,201		11
2025-08-26	NP	EQ ADVISORS TRUST - ATM 小盘波动率管理投资组合 K 级		1,099	-94.16	1	-95.83
2025-08-18	NP	太平洋精选基金 - 小盘股指数投资组合 I 类		1,292	-89.72	1	-93.75
2025-08-14	13F	加州教师退休制度		0	-100.00	0
2025-07-25	NP	SCHA - 嘉信美国小型股 ETF This fund is a listed as child fund of Charles Schwab Investment Management Inc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		169,841	-2.26	172	-27.54
2025-06-26	NP	FSSNX - 富达小型股指数基金 This fund is a listed as child fund of Fmr Llc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		509,474	7.56	785	-11.91
2025-08-06	13F	斯特林资本管理有限公司		0	-100.00	0
2025-08-26	NP	EQ ADVISORS TRUST - EQ/2000 管理波动性投资组合 IB 级		4,717	-90.31	5	-93.55
2025-08-27	NP	VEXMX - 先锋扩展市场指数基金投资者股票 This fund is a listed as child fund of Vanguard Group Inc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		500,323	0.00	525	-18.60
2025-05-15	13F	制造商人寿保险公司		0	-100.00	0
2025-08-13	13F	安大略省医疗保健养老金计划信托基金		0	-100.00	0
2025-08-14	13F	两西格码投资有限合伙人		244,925	160.41	257	112.40
2025-05-14	13F	阿里斯蒂德斯资本有限责任公司		0	-100.00	0	-100.00
2025-08-11	13F	花旗集团		9,179	-74.48	10	-80.43
2025-05-19	NP	林肯可变保险产品信托 - LVIP SSGA 小盘指数基金标准类别		29,000	0.00	37	-48.61
2025-08-12	13F	美洲投资伙伴公司		0	-100.00	0
2025-08-08	13F	Geode资本管理有限公司		407,236	-58.99	428	-66.67
2025-05-13	13F	美国世纪公司		0	-100.00	0
2025-07-24	NP	FBIOX - 生物技术产品组合 This fund is a listed as child fund of Fmr Llc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		547,357		553
2025-05-15	13F	谢伊资本有限责任公司		0	-100.00	0
2025-05-22	NP	DEUTSCHE DWS INVESTMENTS VIT 基金 - DWS 小盘股指数 VIP A 级		7,852	0.00	10	-47.37
2025-05-30	NP	TRSYX - T. Rowe Price 小盘股指数基金 This fund is a listed as child fund of Price T Rowe Associates Inc /md/ and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		3,266	0.00	4	-50.00
2025-06-26	NP	FLXSX - 富达 Flex 小盘股指数基金 This fund is a listed as child fund of Fmr Llc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		12,390	54.43	19	26.67
2025-08-12	13F	科桥金融公司		0	-100.00	0
2025-05-14	13F	哈德逊湾资本管理有限公司		0	-100.00	0
2025-05-29	NP	RYMKX - 罗素 2000 1.5 倍策略基金 H 级		70	118.75	0
2025-06-23	NP	SLPIX - 小盘股深度投资者类别		49	-12.50	0
2025-08-15	13F	摩根士丹利		249,200	196.99	262	141.67
2025-08-26	NP	EQ ADVISORS TRUST - 1290 VT 微型资本投资组合 IB 级		9,695	0.00	10	-16.67
2025-08-14	13F	加拿大帝国商业银行世界市场公司		0	-100.00	0
2025-05-28	NP	Calvert Variable Products, Inc. - Calvert VP Russell 2000 小型股指数投资组合 - I 类		4,497	0.00	6	-54.55
2025-08-08	13F	SG美洲证券有限责任公司		0	-100.00	0
2025-08-12	13F	德意志银行\		0	-100.00	0
2025-08-13	13F	纽约州共同退休基金		0	-100.00	0
2025-05-29	NP	JAFVX - 战略股权配置信托系列资产净值		6,916	0.00	9	-52.94
2025-05-12	13F	Simplex 贸易有限公司		0	-100.00	0
2025-05-15	13F	Allostery 投资公司	Call	0	-100.00	0	-100.00
2025-07-31	13F	地面膨胀资本有限责任公司		13,308		14
2025-05-15	13F	前奏资本管理有限公司		0	-100.00	0	-100.00
2025-08-18	NP	太平洋精选基金 - PD 小盘成长指数投资组合 P 类		286	-85.45	0	-100.00
2025-07-28	NP	UWM - ProShares Ultra Russell2000		5,034	-16.82	5	-37.50
2025-03-26	NP	DFSCX - 美国微型资本投资组合 - 机构级 This fund is a listed as child fund of Dimensional Fund Advisors Lp and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		18,229	158.02	34	9.68
2025-08-14	13F	Ieq资本有限公司		13,841		15
2025-08-06	13F	萨凡特资本有限责任公司		32,409	190.40	34	142.86
2025-07-28	NP	VCSLX - 小盘股指数基金		11,217	-40.47	11	-56.00
2025-05-13	13F	维度基金顾问有限公司		0	-100.00	0	-100.00
2025-08-27	13F/A	Squarepoint Ops LLC		0	-100.00	0	-100.00
2025-07-22	13F	Gsa资本合伙公司		0	-100.00	0
2025-07-24	NP	FSKAX - 富达全市场指数基金 This fund is a listed as child fund of Fmr Llc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		66,248	0.00	67	-26.67
2025-08-14	13F	两个 Sigma 顾问，有限合伙人		100,100	15.19	105	-6.25
2025-08-14	13F	RBF 资本有限责任公司		120,000		126
2025-08-20	NP	全国可变保险信托 - NVIT 小盘指数基金 II 类		755	-89.72	1	-100.00
2025-08-13	13F	琼斯金融公司有限责任公司		1,369	0.00	1	0.00
2025-05-29	NP	RYRUX - Russell 2000 2x 策略基金 A 级股票		184	0.00	0
2025-05-08	13F	XTX Topco有限公司		0	-100.00	0
2025-06-26	NP	DFFVX - 美国目标价值投资组合 - 机构类别 This fund is a listed as child fund of Dimensional Fund Advisors Lp and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		0	-100.00	0	-100.00
2025-07-30	13F	FNY 投资顾问有限责任公司		0	-100.00	0
2025-08-14	13F	Sphera基金管理有限公司		0	-100.00	0
2025-08-14	13F	千禧管理有限公司		789,309	160.01	829	111.76
2025-08-28	NP	IWM - iShares Russell 2000 ETF This fund is a listed as child fund of BlackRock Inc. and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		108,719	-90.76	114	-92.49
2025-06-26	NP	DFSTX - 美国小型股投资组合 - 机构类别 This fund is a listed as child fund of Dimensional Fund Advisors Lp and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		0	-100.00	0	-100.00
2025-08-19	NP	GARTX - 高盛绝对回报跟踪基金 A 类		15,625	-25.16	16	-38.46
2025-06-26	NP	DFA INVESTMENT DIMENSIONS GROUP INC - 美国可持续发展核心 1 投资组合股票 This fund is a listed as child fund of Dimensional Fund Advisors Lp and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		0	-100.00	0	-100.00
2025-08-14	13F	耆那全球有限公司		48,750		51
2025-08-13	13F	亲和资产顾问有限责任公司		223,335	0.00	235	-18.75
2025-08-14	13F	伍德莱合伙公司		0	-100.00	0
2025-08-12	13F	贝莱德公司		578,127	-78.76	607	-82.71
2025-08-06	13F	真实财富设计有限责任公司		382	302.11	0
2025-08-13	13F	克利尔街有限责任公司		1,681	0.00	2	-50.00
2025-08-14	13F	Citadel 顾问有限公司	Put	0	-100.00	0
2025-08-14	13F/A	巴克莱银行		2	-100.00	0
2025-05-28	NP	SSMHX - 道富中小盘股指数投资组合 This fund is a listed as child fund of State Street Corp and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		17,500	0.00	23	-48.84
2025-05-13	13F	保德信金融公司		0	-100.00	0
2025-08-14	13F	兰奇利资本有限责任公司		21,000		22
2025-06-27	NP	RSSL - Global X Russell 2000 ETF		31,092	21.90	48	0.00
2025-07-25	13F	CWM有限公司		6,973	102.53	0
2025-08-12	13F	催化剂基金管理有限公司		23,300		24
2025-08-14	13F	HRT金融有限责任公司		32,195		0
2025-08-14	13F	道富银行		144,363	-72.36	152	-77.56
2025-06-23	NP	UAPIX - 超小盘深度投资者类别		515	-28.37	1	-100.00
2025-08-01	13F	Y-Intercept (香港) 有限公司		107,881		113
2025-08-12	13F	Nuveen有限责任公司		0	-100.00	0
2025-08-12	13F	Legal & General 集团有限公司		0	-100.00	0
2025-08-11	13F	辉瑞公司		2,970,022	0.00	3,119	-18.61
2025-08-28	NP	IWO - iShares Russell 2000 Growth ETF This fund is a listed as child fund of BlackRock Inc. and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		43,881	-90.50	46	-92.27
2025-08-14	13F	联伯恩斯坦有限责任公司		0	-100.00	0
2025-07-24	NP	FNCMX - 富达纳斯达克综合指数基金 This fund is a listed as child fund of Fmr Llc and if that institution has disclosed ownership in this security, then these positions will not be double counted when calculating total shares and total value		37,939	0.00	38	-25.49

94E 机构投资人持股和股东 祖拉生物有限公司 (DB) 股票

基本统计

机构投资人持股和股东

基金情绪分数

13F和NPORT备案

Other Listings

94E 机构投资人持股和股东祖拉生物有限公司 (DB) 股票