XOOMAR

SELLAS Life Sciences Group (SLS)

SELLAS Life Sciences Group on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as pharmaceutical preparations.

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53.8M

Short interest

settlement 2026-10-15

11.9

Days to cover

+2.5 days vs prior

49.1%

Short share of volume

2026-11-02

9,606

Fails to deliver

settlement 2026-10-14

Wed 11 Nov

Next earnings

estimated date

$0

Insider flow, 90 days

0 buys, 0 sells

As of 2026-11-02.

Short interest

FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSON

As of 15 October 2026, short interest in SLS is 53,759,252 shares, down 5,309,378 shares over the last month. Over the last 48 readings it ranged from 7,455,282 shares (13 December 2024) to 63,360,925 shares (15 June 2026). At the reported average volume of 4.5M shares a day that is 11.9 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-10-1553,759,252-2.5%4,498,88111.95
2026-09-3055,128,974-6.7%5,836,4309.45
2026-09-1559,068,630+2.0%6,865,0488.60
2026-08-3157,926,912+2.8%8,420,3986.88
2026-08-1456,371,865+2.5%5,401,98410.44
2026-07-3154,975,815-0.6%6,970,6027.89
2026-07-1555,280,869-12.7%9,327,0345.93
2026-06-3063,307,462-0.1%13,331,7204.75
2026-06-1563,360,925+3.9%6,852,5819.25
2026-05-2961,000,107+6.9%13,792,6994.42
2026-05-1557,070,692-0.1%7,994,7007.14
2026-04-3057,147,188+0.9%4,893,93511.68
2026-04-1556,642,215+5.8%4,155,54013.63
2026-03-3153,525,042+16.9%8,987,3895.96
2026-03-1345,790,317-6.8%7,332,1946.25
2026-02-2749,129,452+6.7%6,310,5037.79
2026-02-1346,050,545+11.4%4,601,43910.01
2026-01-3041,330,037-1.7%6,599,5106.26
2026-01-1542,044,430-14.9%16,240,8842.59
2025-12-3149,429,420+22.1%11,457,7744.31
2025-12-1540,466,622+21.7%5,725,5997.07
2025-11-2833,260,681+4.6%3,246,92810.24
2025-11-1431,792,641+9.8%3,572,4038.90
2025-10-3128,964,581+15.4%6,123,0284.73
2025-10-1525,093,376+8.9%3,490,0447.19
2025-09-3023,051,006+10.3%2,403,1909.59
2025-09-1520,889,586-28.8%1,895,79411.02
2025-08-2929,341,205+0.7%2,165,44113.55
2025-08-1529,152,537+10.4%1,505,48619.36
2025-07-3126,412,853-4.8%2,143,00512.33
2025-07-1527,735,843+13.9%3,552,8347.81
2025-06-3024,359,258+28.9%4,377,8295.56
2025-06-1318,897,977+54.6%2,350,5008.04
2025-05-3012,221,572+39.6%3,374,1993.62
2025-05-158,756,643+13.6%2,618,9933.34
2025-04-307,709,569-0.8%1,876,8324.11
2025-04-157,774,815-4.9%1,148,8516.77
2025-03-318,176,648+4.2%884,9569.24
2025-03-147,845,644+0.5%895,1588.76
2025-02-287,806,570-9.8%1,242,2746.28
2025-02-148,652,314-11.8%2,504,7463.45
2025-01-319,805,787+8.9%7,813,8711.25
2025-01-158,999,899+12.9%1,499,3316.00
2024-12-317,973,831+7.0%1,108,0517.20
2024-12-137,455,282-17.6%2,122,9833.51
2024-11-299,048,267+3.2%1,024,4268.83
2024-11-158,765,519+1.8%784,88111.17
2024-10-318,610,940+41.5%655,46013.14

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 2 November 2026, the short share of SLS volume is 49.1%, down 10.1 points over the last five sessions. Over the last 30 readings it ranged from 46.2% (27 October 2026) to 73.9% (28 October 2026). The latest reading is 10.9 points below the 30-session average of 60.0%, on 6.7M shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-11-023.3M6.7M49.1%362,368
2026-10-301.8M3.0M59.6%20,813
2026-10-292.4M4.1M59.4%439,890
2026-10-288.8M11.9M73.9%1,145,415
2026-10-271.4M3.0M46.2%19,098
2026-10-26886K1.5M59.2%13,730
2026-10-231.0M1.7M60.8%445
2026-10-222.2M3.5M61.2%20,134
2026-10-211.8M3.1M57.6%17,221
2026-10-202.6M5.0M51.0%23,113
2026-10-191.6M2.7M60.6%241,821
2026-10-165.1M7.5M67.1%633,100
2026-10-151.5M2.6M57.2%5,706
2026-10-141.2M2.1M57.5%23,889
2026-10-132.1M3.1M66.6%26,436
2026-10-121.2M2.0M61.3%2,410
2026-10-091.1M1.9M57.2%8,798
2026-10-081.3M2.2M60.0%4,682
2026-10-07830K1.4M57.7%11
2026-10-061.3M1.9M64.9%1,749
2026-10-051.3M2.6M50.0%7,451
2026-10-021.1M1.8M60.0%24
2026-10-012.2M3.0M72.0%261
2026-09-302.5M4.1M61.3%14,881
2026-09-29835K1.4M61.6%0
2026-09-28925K1.7M53.8%0
2026-09-251.3M2.2M61.2%8,959
2026-09-241.4M2.3M62.1%14,908
2026-09-231.3M1.9M69.2%15,338
2026-09-221.8M3.0M60.4%6,548

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 14 October 2026, the fails-to-deliver balance in SLS is 9,606 shares, down 26,431 shares over the last settlement date. Over the last 30 readings it ranged from 855 shares (11 September 2026) to 403,160 shares (1 September 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-10-149,606$12.41$119K
2026-10-1336,037$11.93$430K
2026-10-093,723$11.26$42K
2026-10-0860,660$11.31$686K
2026-10-0781,143$11.34$920K
2026-10-064,923$11.63$57K
2026-10-05139,017$11.74$1.6M
2026-10-02145,120$11.33$1.6M
2026-10-01135,200$12.31$1.7M
2026-09-302,545$11.51$29K
2026-09-291,024$11.59$12K
2026-09-2517,303$11.98$207K
2026-09-2440,679$11.52$469K
2026-09-239,737$12.02$117K
2026-09-2234,249$11.37$389K
2026-09-21140,822$11.49$1.6M
2026-09-18108,639$11.53$1.3M
2026-09-175,310$11.66$62K
2026-09-166,990$11.29$79K
2026-09-15121,577$11.73$1.4M
2026-09-14990$11.55$11K
2026-09-11855$13.49$12K
2026-09-1011,559$13.95$161K
2026-09-0966,656$13.96$931K
2026-09-0895,897$13.86$1.3M
2026-09-0474,952$13.70$1.0M
2026-09-03159,411$14.16$2.3M
2026-09-02180,239$13.22$2.4M
2026-09-01403,160$13.34$5.4M
2026-08-31369,763$13.21$4.9M

Insider trades

SEC Form 4, newest first. JSON

No open-market insider trades were reported for SLS in the last 90 days. The most recent filings are listed below. Latest filing: Stergiou Angelos M. (President and CEO) on 2026-06-16.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-06-16Stergiou Angelos M.President and CEOGrant1.1M$0.00$01.8M
2026-01-07Varian JohnDirectorGrant50K$0.00$073K
2026-01-07VAN NOSTRAND ROBERT LDirectorGrant50K$0.00$083K
2026-01-07Wasman JaneDirectorGrant50K$0.00$093K
2026-01-07SCHEINBERG DAVID ADirectorGrant50K$0.00$073K
2026-01-07Kalin Katherine BachDirectorGrant50K$0.00$0154K
2026-01-07CICIC DRAGANSVP, Chief Development OfficerGrant300K$0.00$0558K
2026-01-07Burns John ThomasCFOGrant300K$0.00$0554K
2025-12-03Stergiou Angelos M.President and CEOOther transaction187K$1.50$281K687K
2025-12-03CICIC DRAGANSVP, Chief Development OfficerOther transaction64K$1.50$96K258K
2025-12-03Burns John ThomasCFOOther transaction59K$1.50$88K254K
2025-11-19Kalin Katherine BachDirectorBuy63K$1.59$101K104K
2025-06-12VAN NOSTRAND ROBERT LDirectorBuy10K$1.48$15K20K
2025-05-30Wasman JaneDirectorBuy20K$1.69$34K30K
2025-05-22Kalin Katherine BachDirectorBuy20K$1.80$36K41K
2025-01-10CICIC DRAGANSVP, Chief Development OfficerGrant113K$0.00$0228K
2025-01-10CICIC DRAGANSVP, Chief Development OfficerGrant81K$0.00$0310K
2025-01-10Varian JohnDirectorGrant13K$0.00$023K
2025-01-10Kalin Katherine BachDirectorGrant13K$0.00$021K
2025-01-10VAN NOSTRAND ROBERT LDirectorGrant13K$0.00$023K
2025-01-10Wasman JaneDirectorGrant13K$0.00$023K
2025-01-10SCHEINBERG DAVID ADirectorGrant13K$0.00$023K
2025-01-10Stergiou Angelos M.President and CEOGrant257K$0.00$0615K
2025-01-10Stergiou Angelos M.President and CEOGrant244K$0.00$0859K
2025-01-10Burns John ThomasCFOGrant81K$0.00$0299K
2025-01-10Burns John ThomasCFOGrant113K$0.00$0218K
2024-12-04Burns John ThomasCFOOther transaction7K$1.13$8K105K
2024-12-04Stergiou Angelos M.President and CEOOther transaction28K$1.13$32K358K
2024-12-04CICIC DRAGANSVP, Chief Development OfficerOther transaction8K$1.13$9K115K
2024-01-22Burns John ThomasCFOGrant47K$0.00$0102K
2024-01-22VAN NOSTRAND ROBERT LDirectorGrant6K$0.00$010K
2024-01-22Varian JohnDirectorGrant6K$0.00$010K
2024-01-22Francomano RobertChief Commercial OfficerGrant20K$0.00$041K
2024-01-22Wasman JaneDirectorGrant6K$0.00$010K
2024-01-22Kalin Katherine BachDirectorGrant6K$0.00$09K
2024-01-22WOOD BARBARA AEVP, Gen. Counsel, Corp. Sec.Grant35K$0.00$0117K
2024-01-22SCHEINBERG DAVID ADirectorGrant6K$0.00$011K
2024-01-22Stergiou Angelos M.President and CEOGrant159K$0.00$0376K
2023-12-06Burns John ThomasCFOOther transaction3K$1.08$3K55K
2023-12-06Francomano RobertChief Commercial OfficerOther transaction1K$1.08$1K21K
2023-12-06Stergiou Angelos M.President and CEOOther transaction12K$1.08$13K217K
2023-12-06WOOD BARBARA AEVP, Gen. Counsel, Corp. Sec.Other transaction4K$1.08$4K82K
2023-02-02Kalin Katherine BachDirectorGrant3K$0.00$03K
2023-02-02SCHEINBERG DAVID ADirectorGrant3K$0.00$05K
2023-02-02VAN NOSTRAND ROBERT LDirectorGrant3K$0.00$04K
2023-02-02Wasman JaneDirectorGrant3K$0.00$04K
2023-02-02Varian JohnDirectorGrant3K$0.00$04K
2023-02-02Francomano RobertChief Commercial OfficerGrant12K$0.00$012K
2023-02-02Stergiou Angelos M.President and CEOGrant58K$0.00$0220K
2023-02-02Burns John ThomasCFOGrant20K$0.00$049K
2023-02-02WOOD BARBARA AEVP, Gen. Counsel, Corp. Sec.Grant20K$0.00$076K
2022-12-05WOOD BARBARA AEVP, Gen. Counsel, Corp. Sec.Sell2K$2.59$6K56K
2022-12-05Burns John ThomasSenior VP, Finance & CAOSell1K$2.59$3K29K
2022-12-05Stergiou Angelos M.President and CEOSell6K$2.61$17K162K
2022-01-31Burns John ThomasSenior VP, Finance & CAOGrant10K$0.00$027K
2022-01-31SCHEINBERG DAVID ADirectorGrant2K$0.00$02K
2022-01-31Stergiou Angelos M.President and CEOGrant44K$0.00$0165K
2022-01-31VAN NOSTRAND ROBERT LDirectorGrant2K$0.00$02K
2022-01-31Varian JohnDirectorGrant2K$0.00$02K
2022-01-31Wasman JaneDirectorGrant2K$0.00$02K
2022-01-31WOOD BARBARA AEVP, Gen. Counsel, Corp. Sec.Grant13K$0.00$055K
2021-12-02Burns John ThomasVP, Finance & Corp ControllerSell231$6.27$1K18K
2021-12-02WOOD BARBARA AEVP, Gen. Counsel, Corp. Sec.Sell847$6.25$5K42K
2021-12-02Stergiou Angelos M.President and CEOSell2K$6.25$13K121K
2021-03-04Stergiou Angelos M.President and CEOGrant20K$0.00$098K
2021-03-04Burns John ThomasVP, Finance & Corp ControllerGrant3K$0.00$013K
2021-03-04WOOD BARBARA AEVP, Gen. Counsel, Corp. Sec.Grant8K$0.00$033K
2020-03-12Burns John ThomasVP, Finance & Corp ControllerGrant15K$0.00$015K
2020-03-12Stergiou Angelos M.President and CEOGrant95K$0.00$095K
2020-03-12WOOD BARBARA AEVP, Gen. Counsel, Corp. Sec.Grant35K$0.00$035K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

3 holders report 5% or more of SLS in their latest filing, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 7.9% of the class (15,872,685 shares), filed 2026-10-27 for an event on 2026-09-30.

FiledFormHolderSharesOf classEvent
2026-10-2713G/Ano. 2BlackRock, Inc.parent holding company15.9M7.9%2026-09-30
2026-08-0713GSTATE STREET CORPORATIONparent holding company13.0M7.0%2026-06-30
2026-07-3113GVanguard Capital Managementinvestment adviser9.7M5.2%2026-06-30
2026-03-2713G/Ano. 1The Vanguard Groupinvestment adviser00.0%2026-03-13
2026-02-1713G/Ano. 1Anson Funds Management LPinvestment adviser, partnership7.5M4.9%2025-12-31
2026-02-1713G/Ano. 1Anson Management GP LLCparent holding company, other entity7.5M4.9%2025-12-31
2026-02-1713G/Ano. 1Tony Mooreparent holding company, individual7.5M4.9%2025-12-31
2026-02-1713G/Ano. 1Anson Advisors Inc.non-US institution, corporation7.5M4.9%2025-12-31
2026-02-1713G/Ano. 1Amin Nathooparent holding company, individual7.5M4.9%2025-12-31
2026-02-1713G/Ano. 1Moez Kassamparent holding company, individual7.5M4.9%2025-12-31
2026-01-3013G/Ano. 2Highbridge Capital Management, LLCinvestment adviser, other entity6.5M3.7%2025-12-31

13F holders

Tracked managers holding SLS at their latest 13F. JSON

2 of the 30 tracked managers held SLS at their latest 13F, $5.4M in total at quarter-end prices. Renaissance Technologies is the largest at $4.6M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 0 cut.

FundQuarterSharesValueOf portfolioChange in shares
Renaissance Technologies2026-06-30310K$4.6M0.01%new
AQR Capital Management2026-06-3058K$858K0.00%+4K

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

Financials

SEC XBRL, as filed. JSON

In FY 2025 it generated -$28.4M of operating cash flow.

Cash
$138.3M
Equity
$137.7M
Total assets
$145.4M
Shares outstanding
201,945,709

Quarterly, last 8 quarters

QuarterPeriod endRevenueNet incomeMarginDiluted EPS
Q2 FY 20262026-06-30n/a-$9.6Mn/a-0.05
Q1 FY 20262026-03-31n/a-$8.4Mn/a-0.05
Q4 FY 2025derived2025-12-31n/a-$7.7Mn/an/a
Q3 FY 20252025-09-30n/a-$6.8Mn/a-0.06
Q2 FY 20252025-06-30n/a-$6.6Mn/a-0.07
Q1 FY 20252025-03-31n/a-$5.8Mn/a-0.07
Q4 FY 2024derived2024-12-31n/a-$6.7Mn/an/a
Q3 FY 20242024-09-30n/a-$7.1Mn/a-0.10

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20252025-12-31n/a-$26.9M-$28.4Mn/an/an/a
FY 20242024-12-31n/a-$30.9M-$35.4Mn/an/an/a
FY 20232023-12-31$0-$37.3M-$31.4Mn/an/an/a
FY 20222022-12-31$1.0M-$41.3M-$23.8Mn/an/an/a
FY 20212021-12-31$7.6M-$20.7M-$26.0Mn/an/an/a

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-08-10 from the cover page.

What this page is

SELLAS Life Sciences Group in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows SELLAS Life Sciences Group (SLS), SEC CIK 1390478, listed on Nasdaq, classified by the SEC as pharmaceutical preparations. The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Short interest
FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-10-15.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-14.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-10-27.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Financials
SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
Earnings dates
SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-11.JSON and CSV
Insider trades
SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-06-16.JSON and CSV
Company record
EDGAR filing index for CIK 1390478Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
10 requests a minute without a key, 30 with a free key from a free account.

How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Datasets

Frequently Asked Questions

How much of SLS is sold short?
53,759,252 shares were held short at the 2026-10-15 settlement, 11.9 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is SLS's daily short volume?
On 2026-11-02, 3,302,550 of the 6,727,446 SLS shares reported to FINRA were sold short, 49.1% of the day's reported volume. Short volume is a flow for one day, not a position.
Does SLS have fails to deliver?
The SEC's latest file shows 9,606 SLS shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.
Are SLS insiders buying or selling?
No open-market insider trades were reported for SLS in the last 90 days. The most recent filings are listed below. Latest filing: Stergiou Angelos M. (President and CEO) on 2026-06-16.
Who owns 5% or more of SLS?
3 holders report 5% or more of SLS in their latest filing, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 7.9% of the class (15,872,685 shares), filed 2026-10-27 for an event on 2026-09-30.
What did SLS report last quarter?
In FY 2025 it generated -$28.4M of operating cash flow.
Which tracked 13F managers own SLS?
2 of the 30 tracked 13F managers held SLS shares at their latest filing, $5.4M in all. The largest: Renaissance Technologies (310K shares, $4.6M), Cliff Asness's AQR Capital Management (58K shares, $858K).

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.