On this page, we present all of the funds holding SNDX from our database of 13F filers, detailed in the table below. The first column indicates the name of each of the funds holding SNDX, with a link to that fund's top holdings. The next columns indicate the amount of SNDX stock held by each of the funds holding SNDX, followed by the SNDX position size held by the fund, and lastly the date of the quarterly filing period the data represents. In total, we count 179 funds holding SNDX within the last two filing periods in our coverage universe of 13F filers, with the largest position size having been reported by Wellington Management Group LLP. For more details on the positions held by Wellington Management Group LLP (or by any of the other funds holding SNDX), click the fund name in the "Holder" column of the funds-holding-SNDX table below.

Holder	Amount	Position Size ($ in 1000's)	As of
Wellington Management Group LLP	7,585,221	$163,917	12/31/2023
SNDX	7,585,221	$163,917	12/31/2023
BlackRock Inc.	7,015,548	$151,606	12/31/2023
SNDX	7,015,548	$151,606	12/31/2023
Kynam Capital Management LP	5,660,000	$122,313	12/31/2023
SNDX	5,660,000	$122,313	12/31/2023
State Street Corp	5,016,224	$108,401	12/31/2023
SNDX	5,016,224	$108,401	12/31/2023
Vanguard Group Inc.	4,335,353	$93,687	12/31/2023
SNDX	4,335,353	$93,687	12/31/2023
Avoro Capital Advisors LLC	4,222,222	$91,242	12/31/2023
SNDX	4,222,222	$91,242	12/31/2023
Avidity Partners Management LP	3,950,000	$85,360	12/31/2023
SNDX	3,950,000	$85,360	12/31/2023
Eversept Partners LP	3,383,244	$73,112	12/31/2023
SNDX	3,383,244	$73,112	12/31/2023
Point72 Asset Management L.P.	2,834,499	$61,254	12/31/2023
SNDX	2,834,499	$61,254	12/31/2023
T. Rowe Price Investment Management Inc.	2,711,253	$58,591	12/31/2023
SNDX	2,711,253	$58,591	12/31/2023
Marshall Wace LLP	2,101,911	$45,422	12/31/2023
SNDX	2,101,911	$45,422	12/31/2023
BVF Inc. IL	1,875,000	$40,519	12/31/2023
SNDX	1,875,000	$40,519	12/31/2023
Orbimed Advisors LLC	1,749,000	$37,796	12/31/2023
SNDX	1,749,000	$37,796	12/31/2023
Morgan Stanley	1,664,306	$35,966	12/31/2023
SNDX	1,664,306	$35,966	12/31/2023
Woodline Partners LP	1,544,216	$33,371	12/31/2023
SNDX	1,544,216	$33,371	12/31/2023
Geode Capital Management LLC	1,535,055	$33,177	12/31/2023
SNDX	1,535,055	$33,177	12/31/2023
Franklin Resources Inc.	1,352,905	$29,236	12/31/2023
SNDX	1,352,905	$29,236	12/31/2023
Goldman Sachs Group Inc.	1,250,948	$27,033	12/31/2023
SNDX	1,250,948	$27,033	12/31/2023
Cormorant Asset Management LP	1,175,000	$25,392	12/31/2023
SNDX	1,175,000	$25,392	12/31/2023
StemPoint Capital LP	1,094,494	$23,652	12/31/2023
SNDX	1,094,494	$23,652	12/31/2023
Sofinnova Investments Inc.	1,075,786	$23,248	12/31/2023
SNDX	1,075,786	$23,248	12/31/2023
Aisling Capital Management LP	1,025,000	$22,150	12/31/2023
SNDX	1,025,000	$22,150	12/31/2023
Candriam Luxembourg S.C.A.	1,021,032	$22,066	12/31/2023
SNDX	1,021,032	$22,066	12/31/2023
Millennium Management LLC	942,642	$20,370	12/31/2023
SNDX	942,642	$20,370	12/31/2023
Adage Capital Partners GP L.L.C.	900,000	$19,449	12/31/2023
SNDX	900,000	$19,449	12/31/2023
Foresite Capital Management IV LLC	875,000	$18,909	12/31/2023
SNDX	875,000	$18,909	12/31/2023
Bank of America Corp DE		$18,158	12/31/2023
SNDX	984,258	$21,270	12/31/2023
Put	144,000	$3,112	12/31/2023
JPMorgan Chase & Co.	780,930	$16,876	12/31/2023
SNDX	780,930	$16,876	12/31/2023
Healthcare of Ontario Pension Plan Trust Fund	780,000	$16,856	12/31/2023
SNDX	780,000	$16,856	12/31/2023
Sphera Funds Management LTD.	772,964	$16,704	12/31/2023
SNDX	772,964	$16,704	12/31/2023
Kingdon Capital Management L.L.C.	746,293	$16,127	12/31/2023
SNDX	746,293	$16,127	12/31/2023
DAFNA Capital Management LLC	742,574	$16,047	12/31/2023
SNDX	742,574	$16,047	12/31/2023
Parkman Healthcare Partners LLC	738,589	$15,961	12/31/2023
SNDX	738,589	$15,961	12/31/2023
Northern Trust Corp	678,105	$14,654	12/31/2023
SNDX	678,105	$14,654	12/31/2023
Nuveen Asset Management LLC	624,010	$13,485	12/31/2023
SNDX	624,010	$13,485	12/31/2023
PFM Health Sciences LP	595,523	$12,869	12/31/2023
SNDX	595,523	$12,869	12/31/2023
Charles Schwab Investment Management Inc.	577,022	$12,469	12/31/2023
SNDX	577,022	$12,469	12/31/2023
Nantahala Capital Management LLC		$12,215	12/31/2023
SNDX	365,259	$7,893	12/31/2023
Call	200,000	$4,322	12/31/2023
Two Sigma Investments LP	535,938	$11,582	12/31/2023
SNDX	535,938	$11,582	12/31/2023
Algert Global LLC	528,157	$11,413	12/31/2023
SNDX	528,157	$11,413	12/31/2023
Saturn V Capital Management LLC	518,799	$11,211	12/31/2023
SNDX	518,799	$11,211	12/31/2023
Ensign Peak Advisors Inc	514,852	$11,126	12/31/2023
SNDX	514,852	$11,126	12/31/2023
Soleus Capital Management L.P.	514,000	$11,108	12/31/2023
SNDX	514,000	$11,108	12/31/2023
Ameriprise Financial Inc.	506,009	$10,935	12/31/2023
SNDX	506,009	$10,935	12/31/2023
Palo Alto Investors LP	472,600	$10,213	12/31/2023
SNDX	472,600	$10,213	12/31/2023
Schonfeld Strategic Advisors LLC	471,475	$10,189	12/31/2023
SNDX	471,475	$10,189	12/31/2023
Rafferty Asset Management LLC	403,381	$8,717	12/31/2023
SNDX	403,381	$8,717	12/31/2023
ExodusPoint Capital Management LP	353,252	$7,634	12/31/2023
SNDX	353,252	$7,634	12/31/2023
Granahan Investment Management Inc. MA	320,911	$6,935	12/31/2023
SNDX	320,911	$6,935	12/31/2023
Assenagon Asset Management S.A.	277,928	$6,615	03/31/2024
SNDX	277,928	$6,615	03/31/2024
UBS Group AG	290,801	$6,284	12/31/2023
SNDX	290,801	$6,284	12/31/2023
Zimmer Partners LP	275,100	$5,945	12/31/2023
SNDX	275,100	$5,945	12/31/2023
Bank of New York Mellon Corp	245,363	$5,840	03/31/2024
SNDX	245,363	$5,840	03/31/2024
Barclays PLC	255,877	$5,530	12/31/2023
SNDX	255,877	$5,530	12/31/2023
Macquarie Group Ltd.	244,090	$5,275	12/31/2023
SNDX	244,090	$5,275	12/31/2023
Jane Street Group LLC		$4,680	12/31/2023
Call	109,500	$2,366	12/31/2023
SNDX	107,066	$2,314	12/31/2023
Peregrine Capital Management LLC	196,079	$4,667	03/31/2024
SNDX	196,079	$4,667	03/31/2024
Panagora Asset Management Inc.	174,144	$3,763	12/31/2023
SNDX	174,144	$3,763	12/31/2023
Voya Investment Management LLC	166,033	$3,588	12/31/2023
SNDX	166,033	$3,588	12/31/2023
Balyasny Asset Management LLC	165,018	$3,566	12/31/2023
SNDX	165,018	$3,566	12/31/2023
BNP Paribas Arbitrage SA	162,905	$3,520	12/31/2023
SNDX	162,905	$3,520	12/31/2023
Citigroup Inc.	162,406	$3,510	12/31/2023
SNDX	162,406	$3,510	12/31/2023
State of New Jersey Common Pension Fund D	159,803	$3,453	12/31/2023
SNDX	159,803	$3,453	12/31/2023
Two Sigma Advisers LP	151,452	$3,273	12/31/2023
SNDX	151,452	$3,273	12/31/2023
Casdin Capital LLC	150,000	$3,242	12/31/2023
SNDX	150,000	$3,242	12/31/2023
Citadel Advisors LLC		$3,194	12/31/2023
SNDX	242,985	$5,251	12/31/2023
Put	133,800	$2,891	12/31/2023
Call	38,600	$834	12/31/2023
Trexquant Investment LP	143,514	$3,101	12/31/2023
SNDX	143,514	$3,101	12/31/2023
Verition Fund Management LLC	143,266	$3,096	12/31/2023
SNDX	143,266	$3,096	12/31/2023
Swiss National Bank	142,400	$3,077	12/31/2023
SNDX	142,400	$3,077	12/31/2023
Walleye Capital LLC		$2,714	12/31/2023
SNDX	127,932	$2,765	12/31/2023
Put	6,500	$140	12/31/2023
Call	4,100	$89	12/31/2023
Yelin Lapidot Holdings Management Ltd.	114,530	$2,475	12/31/2023
SNDX	114,530	$2,475	12/31/2023
UBS Oconnor LLC		$2,399	12/31/2023
SNDX	95,949	$2,073	12/31/2023
Call	75,000	$326	12/31/2023
Dimensional Fund Advisors LP	109,303	$2,362	12/31/2023
SNDX	109,303	$2,362	12/31/2023
Crestline Management LP	100,649	$2,175	12/31/2023
SNDX	100,649	$2,175	12/31/2023
Rhumbline Advisers	95,317	$2,060	12/31/2023
SNDX	95,317	$2,060	12/31/2023
UBS Asset Management Americas Inc.	93,067	$2,011	12/31/2023
SNDX	93,067	$2,011	12/31/2023
Sectoral Asset Management Inc	92,060	$1,989	12/31/2023
SNDX	92,060	$1,989	12/31/2023
Axiom International Investors LLC DE	86,175	$1,862	12/31/2023
SNDX	86,175	$1,862	12/31/2023
Twinbeech Capital LP	83,456	$1,803	12/31/2023
SNDX	83,456	$1,803	12/31/2023
State of Wisconsin Investment Board	78,758	$1,702	12/31/2023
SNDX	78,758	$1,702	12/31/2023
Alliancebernstein L.P.	77,460	$1,674	12/31/2023
SNDX	77,460	$1,674	12/31/2023
California State Teachers Retirement System	75,407	$1,630	12/31/2023
SNDX	75,407	$1,630	12/31/2023
Credit Suisse AG	72,775	$1,573	12/31/2023
SNDX	72,775	$1,573	12/31/2023
Tudor Investment Corp Et Al	68,981	$1,491	12/31/2023
SNDX	68,981	$1,491	12/31/2023
Profund Advisors LLC	65,182	$1,409	12/31/2023
SNDX	65,182	$1,409	12/31/2023
Qube Research & Technologies Ltd	57,361	$1,240	12/31/2023
SNDX	57,361	$1,240	12/31/2023
Principal Financial Group Inc.	55,194	$1,193	12/31/2023
SNDX	55,194	$1,193	12/31/2023
Legal & General Group Plc	55,122	$1,191	12/31/2023
SNDX	55,122	$1,191	12/31/2023
Lighthouse Investment Partners LLC	52,199	$1,128	12/31/2023
SNDX	52,199	$1,128	12/31/2023
Squarepoint Ops LLC	52,035	$1,124	12/31/2023
SNDX	52,035	$1,124	12/31/2023
Jennison Associates LLC	50,780	$1,097	12/31/2023
SNDX	50,780	$1,097	12/31/2023
Hsbc Holdings PLC	48,718	$1,053	12/31/2023
SNDX	48,718	$1,053	12/31/2023
Deutsche Bank AG	48,458	$1,047	12/31/2023
SNDX	48,458	$1,047	12/31/2023
Alps Advisors Inc.	48,126	$1,040	12/31/2023
SNDX	48,126	$1,040	12/31/2023
Mirae Asset Global Investments Co. Ltd.	46,897	$1,013	12/31/2023
SNDX	46,897	$1,013	12/31/2023
D. E. Shaw & Co. Inc.	41,965	$907	12/31/2023
SNDX	41,965	$907	12/31/2023
Parallax Volatility Advisers L.P.	41,985	$907	12/31/2023
SNDX	41,985	$907	12/31/2023
Simplex Trading LLC		$904	03/31/2024
Call	42,800	$1,018	03/31/2024
Put	16,400	$390	03/31/2024
SNDX	11,629	$276	03/31/2024
FMR LLC	40,696	$879	12/31/2023
SNDX	40,696	$879	12/31/2023
Atika Capital Management LLC	40,000	$864	12/31/2023
SNDX	40,000	$864	12/31/2023
Sei Investments Co.	39,472	$853	12/31/2023
SNDX	39,472	$853	12/31/2023
AQR Capital Management LLC	35,902	$776	12/31/2023
SNDX	35,902	$776	12/31/2023
MetLife Investment Management LLC	34,755	$751	12/31/2023
SNDX	34,755	$751	12/31/2023
Lion Point Capital LP	34,500	$746	12/31/2023
SNDX	34,500	$746	12/31/2023
The Manufacturers Life Insurance Company	33,924	$733	12/31/2023
SNDX	33,924	$733	12/31/2023
American International Group Inc.	33,221	$718	12/31/2023
SNDX	33,221	$718	12/31/2023
Allianz Asset Management GmbH	31,000	$670	12/31/2023
SNDX	31,000	$670	12/31/2023
TD Asset Management Inc.	30,760	$665	12/31/2023
SNDX	30,760	$665	12/31/2023
Entropy Technologies LP	30,571	$661	12/31/2023
SNDX	30,571	$661	12/31/2023
DekaBank Deutsche Girozentrale	28,300	$636	03/31/2024
SNDX	28,300	$636	03/31/2024
Invesco Ltd.	29,320	$634	12/31/2023
SNDX	29,320	$634	12/31/2023
SG Americas Securities LLC	29,169	$630	12/31/2023
SNDX	29,169	$630	12/31/2023
New York State Common Retirement Fund	28,983	$626	12/31/2023
SNDX	28,983	$626	12/31/2023
Janus Henderson Group PLC	26,447	$572	12/31/2023
SNDX	26,447	$572	12/31/2023
Strs Ohio	26,400	$570	12/31/2023
SNDX	26,400	$570	12/31/2023
Price T Rowe Associates Inc. MD	26,267	$568	12/31/2023
SNDX	26,267	$568	12/31/2023
GSA Capital Partners LLP	24,659	$533	12/31/2023
SNDX	24,659	$533	12/31/2023
Wells Fargo & Company MN	22,893	$495	12/31/2023
SNDX	22,893	$495	12/31/2023
Public Employees Retirement Association of Colorado	21,911	$473	12/31/2023
SNDX	21,911	$473	12/31/2023
E Fund Management Co. Ltd.	21,580	$466	12/31/2023
SNDX	21,580	$466	12/31/2023
Zurcher Kantonalbank Zurich Cantonalbank	18,292	$435	03/31/2024
SNDX	18,292	$435	03/31/2024
Belvedere Trading LLC		$432	12/31/2023
Call	20,000	$432	12/31/2023
Royal Bank of Canada	19,362	$418	12/31/2023
SNDX	19,362	$418	12/31/2023
State Board of Administration of Florida Retirement System	18,968	$410	12/31/2023
SNDX	18,968	$410	12/31/2023
China Universal Asset Management Co. Ltd.	16,338	$389	03/31/2024
SNDX	16,338	$389	03/31/2024
CWM Advisors LLC	17,780	$384	12/31/2023
SNDX	17,780	$384	12/31/2023
PEAK6 Investments LLC	17,541	$379	12/31/2023
SNDX	17,541	$379	12/31/2023
Diversified Trust Co	15,523	$369	03/31/2024
SNDX	15,523	$369	03/31/2024
Russell Investments Group Ltd.	17,086	$369	12/31/2023
SNDX	17,086	$369	12/31/2023
Principle Wealth Partners LLC	15,000	$357	03/31/2024
SNDX	15,000	$357	03/31/2024
Arizona State Retirement System	16,511	$357	12/31/2023
SNDX	16,511	$357	12/31/2023
Engineers Gate Manager LP	16,240	$351	12/31/2023
SNDX	16,240	$351	12/31/2023
ProShare Advisors LLC	15,513	$335	12/31/2023
SNDX	15,513	$335	12/31/2023
Bayesian Capital Management LP	15,116	$327	12/31/2023
SNDX	15,116	$327	12/31/2023
Graham Capital Management L.P.	14,936	$323	12/31/2023
SNDX	14,936	$323	12/31/2023
Exchange Traded Concepts LLC	12,580	$299	03/31/2024
SNDX	12,580	$299	03/31/2024
Mesirow Financial Investment Management Inc.	12,318	$293	03/31/2024
SNDX	12,318	$293	03/31/2024
Teacher Retirement System of Texas	13,481	$291	12/31/2023
SNDX	13,481	$291	12/31/2023
Virtu Financial LLC	11,948	$258	12/31/2023
SNDX	11,948	$258	12/31/2023
Simplify Asset Management Inc.	11,801	$255	12/31/2023
SNDX	11,801	$255	12/31/2023
Creative Planning	11,329	$245	12/31/2023
SNDX	11,329	$245	12/31/2023
Capstone Investment Advisors LLC	10,895	$235	12/31/2023
SNDX	10,895	$235	12/31/2023
DNB Asset Management AS	9,368	$223	03/31/2024
SNDX	9,368	$223	03/31/2024
Farallon Capital Management LLC	10,000	$216	12/31/2023
SNDX	10,000	$216	12/31/2023
Wedbush Securities Inc.	10,000	$216	12/31/2023
SNDX	10,000	$216	12/31/2023
US Bancorp DE	7,730	$167	12/31/2023
SNDX	7,730	$167	12/31/2023
Ameritas Investment Partners Inc.	6,546	$141	12/31/2023
SNDX	6,546	$141	12/31/2023
Great West Life Assurance Co. Can	5,595	$120	12/31/2023
SNDX	5,595	$120	12/31/2023
Susquehanna International Group LLP		$104	12/31/2023
Put	148,600	$3,211	12/31/2023
Call	129,000	$2,788	12/31/2023
SNDX	24,397	$527	12/31/2023
Virtus ETF Advisers LLC	4,657	$101	12/31/2023
SNDX	4,657	$101	12/31/2023
Metropolitan Life Insurance Co NY	3,807	$82	12/31/2023
SNDX	3,807	$82	12/31/2023
Signaturefd LLC	3,748	$81	12/31/2023
SNDX	3,748	$81	12/31/2023
Tower Research Capital LLC TRC	3,286	$71	12/31/2023
SNDX	3,286	$71	12/31/2023
Amalgamated Bank	2,660	$63	03/31/2024
SNDX	2,660	$63	03/31/2024
Quadrant Capital Group LLC	2,441	$53	12/31/2023
SNDX	2,441	$53	12/31/2023
CWM LLC	1,724	$41	03/31/2024
SNDX	1,724	$41	03/31/2024
MeadowBrook Investment Advisors LLC	1,700	$37	12/31/2023
SNDX	1,700	$37	12/31/2023
Advisor Group Holdings Inc.	1,714	$37	12/31/2023
SNDX	1,714	$37	12/31/2023
EntryPoint Capital LLC	1,471	$32	12/31/2023
SNDX	1,471	$32	12/31/2023
The PNC Financial Services Group Inc.	978	$21	12/31/2023
SNDX	978	$21	12/31/2023
Comerica Bank	986	$21	12/31/2023
SNDX	986	$21	12/31/2023
Lindbrook Capital LLC	802	$19	03/31/2024
SNDX	802	$19	03/31/2024
Quarry LP	750	$16	12/31/2023
SNDX	750	$16	12/31/2023
Allworth Financial LP	354	$8	03/31/2024
SNDX	354	$8	03/31/2024
Parallel Advisors LLC	361	$8	12/31/2023
SNDX	361	$8	12/31/2023
Global Retirement Partners LLC	315	$7	03/31/2024
SNDX	315	$7	03/31/2024
Daiwa Securities Group Inc.	242	$5	12/31/2023
SNDX	242	$5	12/31/2023
Steward Partners Investment Advisory LLC	231	$5	12/31/2023
SNDX	231	$5	12/31/2023
Truvestments Capital LLC	218	$5	12/31/2023
SNDX	218	$5	12/31/2023
GAMMA Investing LLC	69	$2	03/31/2024
SNDX	69	$2	03/31/2024
Glassman Wealth Services	99	$2	12/31/2023
SNDX	99	$2	12/31/2023
Massmutual Trust Co. FSB ADV	56	$1	03/31/2024
SNDX	56	$1	03/31/2024
Nisa Investment Advisors LLC	35	$1	12/31/2023
SNDX	35	$1	12/31/2023
Northwestern Mutual Wealth Management Co.	50	$1	12/31/2023
SNDX	50	$1	12/31/2023
Farther Finance Advisors LLC	60	$1	12/31/2023
SNDX	60	$1	12/31/2023
Proequities Inc.		$0	12/31/2023
Put	0	$0	12/31/2023
Call	0	$0	12/31/2023
SNDX	0	$0	12/31/2023
Assetmark Inc.	10	$0	12/31/2023
SNDX	10	$0	12/31/2023
Caption Management LLC		$0	12/31/2023
Put	39,900	$862	12/31/2023
Call	39,900	$862	12/31/2023
Covestor Ltd	5	$0	12/31/2023
SNDX	5	$0	12/31/2023
Group One Trading L.P.	25,400	$-332	12/31/2023
Put	66,600	$1,439	12/31/2023
SNDX	25,837	$558	12/31/2023
Call	25,400	$549	12/31/2023