Vault-13

ETON PHARMACEUTICALS INC ETON

COM · Common Stock · CUSIP 29772L108

88 institutional holders +1 vs Q1 2025
17,071,85117.1m shares reported held*
63.7% of all shares outstanding*
$243.3mreported value*
26 new 35 added 19 reduced 25 sold out net bought ≈ $35.1m (+2.5m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($87.5k this quarter). Holder counts are more reliable. Shares outstanding: 26.8m as of 2025-08-05, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $14.25. Options: 5 managers hold calls ($4.5m notional), 3 hold puts ($169.6k).

Trends to Q2 2025

Institutional holders

Managers reporting a position, each quarter

050100Q3 22: 33Q4 22: 32Q1 23: 36Q2 23: 34Q3 23: 51Q4 23: 57Q1 24: 45Q2 24: 46Q3 24: 49Q4 24: 72Q1 25: 87Q2 25: 8888Q3 22Q2 23Q1 24Q4 24Q2 25
Numbers
QuarterHolders
Q3 202233
Q4 202232
Q1 202336
Q2 202334
Q3 202351
Q4 202357
Q1 202445
Q2 202446
Q3 202449
Q4 202472
Q1 202587
Q2 202588

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
1000100Q3 23: 31 bought or addedQ3 23: 10 cut or sold outQ4 23: 32 bought or addedQ4 23: 17 cut or sold outQ4 23Q1 24: 15 bought or addedQ1 24: 26 cut or sold outQ2 24: 13 bought or addedQ2 24: 22 cut or sold outQ2 24Q3 24: 22 bought or addedQ3 24: 18 cut or sold outQ4 24: 51 bought or addedQ4 24: 14 cut or sold outQ4 24Q1 25: 54 bought or addedQ1 25: 33 cut or sold outQ2 25: 61 bought or addedQ2 25: 44 cut or sold outQ2 25
Numbers
QuarterBought or addedCut or sold out
Q3 20233110
Q4 20233217
Q1 20241526
Q2 20241322
Q3 20242218
Q4 20245114
Q1 20255433
Q2 20256144

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$2m$4m$6mQ3 24 calls: $1.6mQ3 24 puts: $9.0kQ3 24P/C 0.01Q4 24 calls: $3.9mQ4 24 puts: $69.3kQ4 24P/C 0.02Q1 25 calls: $891.4kQ1 25 puts: $475.6kQ1 25P/C 0.53Q2 25 calls: $4.5mQ2 25 puts: $169.6kQ2 25P/C 0.04
Numbers
QuarterCallsPutsP/C
Q3 2024$1.6m$9.0k0.01
Q4 2024$3.9m$69.3k0.02
Q1 2025$891.4k$475.6k0.53
Q2 2025$4.5m$169.6k0.04

Biggest buyers

BlackRock, Inc. Added +1,186,351+1.2m
Divisadero Street Capital Management, LP New +497,716+497.7k
MORGAN STANLEY Added +362,236+362.2k
GEODE CAPITAL MANAGEMENT, LLC Added +294,617+294.6k
Soleus Capital Management, L.P. New +285,000+285.0k
VANGUARD GROUP INC Added +211,210+211.2k
STATE STREET CORP Added +208,958+209.0k
THOMPSON SIEGEL & WALMSLEY LLC Added +191,402+191.4k
NORTHERN TRUST CORP Added +177,761+177.8k
TWO SIGMA INVESTMENTS, LP Added +132,197+132.2k

Biggest sellers

SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced -418,206-418.2k
MILLENNIUM MANAGEMENT LLC Sold out -355,929-355.9k
CANNELL CAPITAL LLC Reduced -303,192-303.2k
STIFEL FINANCIAL CORP Reduced -211,822-211.8k
Mink Brook Asset Management LLC Reduced -126,349-126.3k
PRELUDE CAPITAL MANAGEMENT, LLC Reduced -125,836-125.8k
Cubist Systematic Strategies, LLC Sold out -103,200-103.2k
JANE STREET GROUP, LLC Sold out -95,919-95.9k
Informed Momentum Co LLC Sold out -77,833-77.8k
Aristides Capital LLC Reduced -74,000-74.0k

Biggest calls

SUSQUEHANNA INTERNATIONAL GROUP, LLP New $2.8m198.5k shares
CITADEL ADVISORS LLC Added $615.6k43.2k shares
SIMPLEX TRADING, LLC Added $558.0k39.2k shares
GROUP ONE TRADING LLC Added $542.9k38.1k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares

Biggest puts

SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced $168.2k11.8k shares
GROUP ONE TRADING LLC New $1.4k100 shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
EcoR1 Capital, LLC 13G · institution filed 2025-02-14 7.7% 2.0m≈ $71.7m 2025-02-14
BlackRock, Inc. 13G · institution +1.2 pts · filed 2026-07-28 6.9% +1.2 pts 1.9m≈ $68.1m 2026-07-28

Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-26)

Insider purchases and sales in Q2 2025

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
202Q3 23: 0 buyingQ3 23: 0 sellingQ4 23: 0 buyingQ4 23: 0 sellingQ4 23Q1 24: 0 buyingQ1 24: 0 sellingQ2 24: 0 buyingQ2 24: 0 sellingQ2 24Q3 24: 0 buyingQ3 24: 0 sellingQ4 24: 0 buyingQ4 24: 0 sellingQ4 24Q1 25: 0 buyingQ1 25: 0 sellingQ2 25: 0 buyingQ2 25: 2 sellingQ2 25
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q3 20230—0——
Q4 20230—0——
Q1 20240—0——
Q2 20240—0——
Q3 20240—0——
Q4 20240—0——
Q1 20250—0——
Q2 20250—2$4.1m—
DateInsiderTradeSharesPrice ValueTheir holding
2025-06-16 Krempa David Chief Business Officer Sold 10,223 $14.73 $150.6k10.2k shares -2%
2025-06-13 Krempa David Chief Business Officer Sold 6,800 $14.77 $100.4k6.8k shares -1%
2025-06-12 Krempa David Chief Business Officer Sold 16,977 $14.92 $253.3k17.0k shares -3%
2025-06-10 Opaleye Management Inc. 10% owner · By Opaleye, L.P. Bought 5,000 $15.82 $79.1k5.0k shares +<1%
2025-06-10 Opaleye Management Inc. 10% owner · Managed Account Bought 2,930 $15.82 $46.4k2.9k shares +4%
2025-06-05 BRYNJELSEN SEAN President & CEO, director Sold 70,000 $16.81 $1.2m70.0k shares -2%
2025-06-04 BRYNJELSEN SEAN President & CEO, director Sold 70,000 $17.00 $1.2m70.0k shares -2%
2025-06-03 BRYNJELSEN SEAN President & CEO, director Sold 70,000 $17.51 $1.2m70.0k shares -2%

Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).

Holders, Q2 2025

#ManagerLocationShares Value% of their portfolioChangeShares change
1 Opaleye Management Inc. 8.25% of their portfolio BOSTON, MA 2,860,0002.9m $40.8m $40.8m 8.25% Added +7.9k +7,930
2 EcoR1 Capital, LLC 1.71% of their portfolio San Francisco, CA 2,030,5442.0m $28.9m $28.9m 1.71% Added +91.3k +91,256
3 BlackRock, Inc. 0.00% of their portfolio New York, NY 1,531,7111.5m $21.8m $21.8m 0.00% Added +1.2m +1,186,351
4 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 1,312,1731.3m $18.7m $18.7m 0.00% Added +211.2k +211,210
5 Nantahala Capital Management, LLC 1.19% of their portfolio NEW CANAAN, CT 1,175,9511.2m $16.8m $16.8m 1.19% Unchanged
6 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 592,865592.9k $8.5m $8.5m 0.00% Added +294.6k +294,617
7 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 509,568509.6k $7.3m $7.3m 0.00% Added +362.2k +362,236
8 Divisadero Street Capital Management, LP 0.47% of their portfolio MIAMI, FL 497,716497.7k $7.1m $7.1m 0.47% New
9 National Philanthropic Trust 0.09% of their portfolio Jenkintown, PA 492,112492.1k $7.0m $7.0m 0.09% Unchanged
10 Westside Investment Management, Inc. 1.25% of their portfolio SANTA MONICA, CA 472,790472.8k $6.7m $6.7m 1.25% Reduced -20.9k -20,860
11 RENAISSANCE TECHNOLOGIES LLC 0.01% of their portfolio NEW YORK, NY 405,900405.9k $5.8m $5.8m 0.01% Added +131.9k +131,900
12 ACADIAN ASSET MANAGEMENT LLC 0.01% of their portfolio Boston, MA 392,715392.7k $5.6m $5.6m 0.01% Reduced -9.7k -9,713
13 CANNELL CAPITAL LLC 1.73% of their portfolio ALTA, WY 388,175388.2k $5.5m $5.5m 1.73% Reduced -303.2k -303,192
14 THOMPSON SIEGEL & WALMSLEY LLC 0.09% of their portfolio RICHMOND, VA 381,265381.3k $5.4m $5.4m 0.09% Added +191.4k +191,402
15 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 323,194323.2k $4.6m $4.6m 0.00% Added +209.0k +208,958
16 Soleus Capital Management, L.P. 0.28% of their portfolio GREENWICH, CT 285,000285.0k $4.1m $4.1m 0.28% New
17 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 262,211262.2k $3.7m $3.7m 0.00% Added +177.8k +177,761
18 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 242,580242.6k $3.5m $3.5m 0.00% Added +129.5k +129,467
19 Connor, Clark & Lunn Investment Management Ltd. 0.01% of their portfolio VANCOUVER, A1 222,083222.1k $3.2m $3.2m 0.01% Reduced -10.4k -10,449
20 TWO SIGMA INVESTMENTS, LP 0.01% of their portfolio NEW YORK, NY 214,552214.6k $3.1m $3.1m 0.01% Added +132.2k +132,197
21 UBS Group AG 0.00% of their portfolio ZURICH, V8 212,484212.5k $3.0m $3.0m 0.00% Added +116.7k +116,736
22 Aristides Capital LLC 0.76% of their portfolio LOUISVILLE, KY 167,587167.6k $2.4m $2.4m 0.76% Reduced -74.0k -74,000
23 BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.05% of their portfolio HOUSTON, TX 135,270135.3k $1.9m $1.9m 0.05% Unchanged
24 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 127,344127.3k $1.8m $1.8m 0.00% Added +53.1k +53,098
25 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 109,379109.4k $1.6m $1.6m 0.00% Reduced -65.8k -65,841
26 STIFEL FINANCIAL CORP 0.00% of their portfolio ST. LOUIS, MO 108,168108.2k $1.5m $1.5m 0.00% Reduced -211.8k -211,822
27 Apis Capital Advisors, LLC 0.54% of their portfolio New York, NY 106,000106.0k $1.5m $1.5m 0.54% New
28 TWO SIGMA ADVISERS, LP 0.00% of their portfolio NEW YORK, NY 100,900100.9k $1.4m $1.4m 0.00% Added +47.8k +47,800
29 Squarepoint Ops LLC 0.00% of their portfolio NEW YORK, NY 93,79693.8k $1.3m $1.3m 0.00% Added +29.0k +29,001
30 RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio ST. PETERSBURG, FL 90,41590.4k $1.3m $1.3m 0.00% Added +12.2k +12,202
31 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 87,69687.7k $1.2m $1.2m 0.00% Added +48.4k +48,379
32 ANCHOR CAPITAL ADVISORS LLC 0.04% of their portfolio Boston, MA 87,66187.7k $1.2m $1.2m 0.04% Added +27.5k +27,482
33 Diametric Capital, LP 0.65% of their portfolio BOSTON, MA 84,85884.9k $1.2m $1.2m 0.65% Added +65.3k +65,261
34 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio SAN FRANCISCO, CA 77,84877.8k $1.1m $1.1m 0.00% Added +64.6k +64,601
35 Nuveen, LLC 0.00% of their portfolio CHARLOTTE, NC 58,91758.9k $839.6k $839.6k 0.00% New
36 JACOBS LEVY EQUITY MANAGEMENT, INC 0.00% of their portfolio FLORHAM PARK, NJ 54,27554.3k $773.4k $773.4k 0.00% Unchanged
37 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 45,79045.8k $652.5k $652.5k 0.00% Added +1.1k +1,129
38 PRELUDE CAPITAL MANAGEMENT, LLC 0.06% of their portfolio NEW YORK, NY 43,60043.6k $621.3k $621.3k 0.06% Reduced -125.8k -125,836
39 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 36,92136.9k $526.1k $526.1k 0.00% Added +24.5k +24,481
40 RHUMBLINE ADVISERS 0.00% of their portfolio BOSTON, MA 36,59436.6k $521.5k $521.5k 0.00% New
41 Aquatic Capital Management LLC 0.01% of their portfolio CHICAGO, IL 35,85035.9k $510.9k $510.9k 0.01% New
42 Qube Research & Technologies Ltd 0.00% of their portfolio LONDON, X0 34,55734.6k $492.4k $492.4k 0.00% Reduced -52.3k -52,291
43 BLAIR WILLIAM & CO/IL 0.00% of their portfolio CHICAGO, IL 32,40032.4k $461.7k $461.7k 0.00% Reduced -2.5k -2,500
44 BRC Group Holdings, Inc. 0.52% of their portfolio LOS ANGELES, CA 31,50431.5k $448.9k $448.9k 0.52% New
45 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 30,59830.6k $436.0k $436.0k 0.00% Reduced -418.2k -418,206
46 WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio Boston, MA 29,21329.2k $416.3k $416.3k 0.00% Added +3.9k +3,930
47 Quantbot Technologies LP 0.01% of their portfolio NEW YORK, NY 25,23325.2k $359.6k $359.6k 0.01% Added +17.4k +17,439
48 Man Group plc 0.00% of their portfolio LONDON, X0 23,75423.8k $338.5k $338.5k 0.00% Added +1.4k +1,350
49 ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio Berwyn, PA 23,05023.1k $328.5k $328.5k 0.00% Added +5.7k +5,734
50 ESSEX INVESTMENT MANAGEMENT CO LLC 0.05% of their portfolio BOSTON, MA 20,18220.2k $287.6k $287.6k 0.05% Reduced -237 -237
51 Hillsdale Investment Management Inc. 0.01% of their portfolio Toronto, A6 18,90318.9k $269.4k $269.4k 0.01% Reduced -80 -80
52 Russell Investments Group, Ltd. 0.00% of their portfolio Seattle, WA 18,11218.1k $258.1k $258.1k 0.00% New
53 DEUTSCHE BANK AG\ 0.00% of their portfolio FRANKFURT AM MAIN, 2M 17,39917.4k $247.9k $247.9k 0.00% New
54 CHICAGO TRUST Co NA 0.03% of their portfolio GRAYSLAKE, IL 16,70016.7k $238.0k $238.0k 0.03% Unchanged
55 MetLife Investment Management, LLC 0.00% of their portfolio Whippany, NJ 15,53715.5k $221.4k $221.4k 0.00% New
56 Mink Brook Asset Management LLC 0.19% of their portfolio West Palm Beach, FL 15,13915.1k $215.7k $215.7k 0.19% Reduced -126.3k -126,349
57 PDT Partners, LLC 0.01% of their portfolio New York, NY 14,89114.9k $212.2k $212.2k 0.01% Reduced -10.9k -10,864
58 Steward Partners Investment Advisory, LLC 0.00% of their portfolio STAMFORD, CT 14,06414.1k $200.4k $200.4k 0.00% Added +6.6k +6,565
59 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio CAUSEWAY BAY, K3 14,03814.0k $200.0k $200.0k 0.00% New
60 Engineers Gate Manager LP 0.00% of their portfolio NEW YORK, NY 13,88913.9k $197.9k $197.9k 0.00% New
61 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 13,75013.8k $195.9k $195.9k 0.00% Added +13.0k +13,000
62 Magnetar Financial LLC 0.00% of their portfolio EVANSTON, IL 13,73113.7k $195.7k $195.7k 0.00% New
63 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 13,47813.5k $192.1k $192.1k 0.00% New
64 PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio BALTIMORE, MD 12,84012.8k $183.0k $183.0k 0.00% New
65 INTECH INVESTMENT MANAGEMENT LLC 0.00% of their portfolio WEST PALM BEACH, FL 12,06812.1k $172.0k $172.0k 0.00% New
66 State of Tennessee, Department of Treasury 0.00% of their portfolio NASHVILLE, TN 12,00012.0k $171.0k $171.0k 0.00% Reduced -1.9k -1,950
67 State of Wyoming 0.02% of their portfolio CHEYENNE, WY 11,50311.5k $163.9k $163.9k 0.02% Reduced -14.9k -14,940
68 Quantum Private Wealth, LLC 0.05% of their portfolio TAMPA, FL 11,50011.5k $163.9k $163.9k 0.05% Unchanged
69 Y-Intercept (Hong Kong) Ltd 0.00% of their portfolio HONG KONG, K3 10,99111.0k $156.6k $156.6k 0.00% Reduced -2.4k -2,409
70 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 10,13010.1k $144.0k $144.0k 0.00% Added +8.5k +8,501
71 NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO 0.00% of their portfolio MILWAUKEE, WI 10,00010.0k $142.5k $142.5k 0.00% New
72 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 9,1039.1k $129.7k $129.7k 0.00% Added +9.1k +9,102
73 NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio ALBANY, NY 8,1008.1k $115.4k $115.4k 0.00% New
74 Police & Firemen's Retirement System of New Jersey 0.00% of their portfolio TRENTON, NJ 6,1376.1k $87.5k $87.5k 0.00% New
75 AlphaQuest LLC 0.01% of their portfolio New York, NY 5,9485.9k $84.8k $84.8k 0.01% Added +1.8k +1,830
76 Legal & General Group Plc 0.00% of their portfolio London, X0 2,8522.9k $40.6k $40.6k 0.00% New
77 Ameritas Investment Partners, Inc. 0.00% of their portfolio LINCOLN, NE 2,6172.6k $37.3k $37.3k 0.00% New
78 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 2,5582.6k $36.5k $36.5k 0.00% Reduced -413 -413
79 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio WEST SACRAMENTO, CA 1,6001.6k $22.8k $22.8k 0.00% New
80 Truvestments Capital LLC 0.00% of their portfolio SARASOTA, FL 1,1831.2k $16.9k $16.9k 0.00% Unchanged
81 AMALGAMATED BANK 0.00% of their portfolio NEW YORK, NY 876876 $12.0k $12.0k 0.00% New
82 FMR LLC 0.00% of their portfolio BOSTON, MA 455455 $6.5k $6.5k 0.00% Added +445 +445
83 Caitong International Asset Management Co., Ltd 0.00% of their portfolio HONG KONG, K3 433433 $6.2k $6.2k 0.00% Added +356 +356
84 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 200200 $2.9k $2.9k 0.00% New
85 Vermillion & White Wealth Management Group, LLC 0.00% of their portfolio PHOENIXVILLE, PA 150150 $2.1k $2.1k 0.00% New
86 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 102102 $1.5k $1.5k 0.00% Added +2 +2
87 Sterling Capital Management LLC 0.00% of their portfolio CHARLOTTE, NC 6262 $884 $884 0.00% New
88 CONCOURSE FINANCIAL GROUP SECURITIES, INC. — of their portfolio BIRMINGHAM, AL 00 $0 $0 — Unchanged