Sera Prognostics (SERA)
Sera Prognostics on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as services-medical laboratories.
230K
Short interest
settlement 2026-09-30
13.4
Days to cover
+5.9 days vs prior
54.1%
Short share of volume
2026-10-09
3
Fails to deliver
settlement 2026-09-14
Thu 12 Nov
Next earnings
estimated date
-$63K
Insider flow, 90 days
0 buys, 5 sells
As of 2026-10-09.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in SERA is 229,723 shares, up 7,932 shares over the last month. Over the last 48 readings it ranged from 213,893 shares (15 September 2026) to 1,358,447 shares (15 July 2025). The latest reading sits at the bottom of that range. At the reported average volume of 17K shares a day that is 13.4 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/sera" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 229,723 | +7.4% | 17,119 | 13.42 |
| 2026-09-15 | 213,893 | -3.6% | 28,325 | 7.55 |
| 2026-08-31 | 221,791 | -1.5% | 21,234 | 10.45 |
| 2026-08-14 | 225,264 | -2.4% | 37,541 | 6.00 |
| 2026-07-31 | 230,875 | -4.1% | 35,921 | 6.43 |
| 2026-07-15 | 240,837 | -8.3% | 35,282 | 6.83 |
| 2026-06-30 | 262,549 | -1.0% | 40,703 | 6.45 |
| 2026-06-15 | 265,259 | -10.8% | 50,590 | 5.24 |
| 2026-05-29 | 297,212 | +5.8% | 94,780 | 3.14 |
| 2026-05-15 | 280,984 | -5.8% | 67,186 | 4.18 |
| 2026-04-30 | 298,294 | -14.2% | 15,128 | 19.72 |
| 2026-04-15 | 347,818 | -8.8% | 32,636 | 10.66 |
| 2026-03-31 | 381,493 | +54.2% | 82,680 | 4.61 |
| 2026-03-13 | 247,469 | -12.8% | 114,505 | 2.16 |
| 2026-02-27 | 283,783 | -1.6% | 27,358 | 10.37 |
| 2026-02-13 | 288,292 | -8.7% | 22,159 | 13.01 |
| 2026-01-30 | 315,664 | -6.5% | 55,355 | 5.70 |
| 2026-01-15 | 337,661 | +13.1% | 57,656 | 5.86 |
| 2025-12-31 | 298,455 | -14.8% | 57,653 | 5.18 |
| 2025-12-15 | 350,334 | -10.4% | 65,451 | 5.35 |
| 2025-11-28 | 391,069 | -9.6% | 30,897 | 12.66 |
| 2025-11-14 | 432,554 | -9.4% | 36,309 | 11.91 |
| 2025-10-31 | 477,655 | -10.3% | 49,182 | 9.71 |
| 2025-10-15 | 532,596 | -5.9% | 34,078 | 15.63 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 9 October 2026, the short share of SERA volume is 54.1%, up 24.7 points over the last five sessions. Over the last 30 readings it ranged from 2.1% (6 October 2026) to 83.2% (18 September 2026). The latest reading is 7.2 points above the 30-session average of 47.0%, on 5K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-09 | 3K | 5K | 54.1% | 0 |
| 2026-10-08 | 201 | 7K | 3.1% | 11 |
| 2026-10-07 | 103 | 175 | 58.9% | 0 |
| 2026-10-06 | 56 | 3K | 2.1% | 0 |
| 2026-10-05 | 3K | 8K | 41.4% | 0 |
| 2026-10-02 | 4K | 14K | 29.5% | 0 |
| 2026-10-01 | 507 | 984 | 51.5% | 0 |
| 2026-09-30 | 7K | 9K | 73.2% | 0 |
| 2026-09-29 | 714 | 3K | 21.2% | 0 |
| 2026-09-28 | 2K | 5K | 32.3% | 1,118 |
| 2026-09-25 | 1K | 8K | 15.5% | 0 |
| 2026-09-24 | 2K | 3K | 70.5% | 0 |
| 2026-09-23 | 4K | 9K | 44.2% | 0 |
| 2026-09-22 | 1K | 2K | 76.3% | 0 |
| 2026-09-21 | 4K | 6K | 71.7% | 5 |
| 2026-09-18 | 2K | 2K | 83.2% | 4 |
| 2026-09-17 | 591 | 4K | 15.7% | 0 |
| 2026-09-16 | 1K | 2K | 78.9% | 0 |
| 2026-09-15 | 8K | 18K | 42.9% | 0 |
| 2026-09-14 | 10K | 19K | 54.0% | 930 |
| 2026-09-11 | 2K | 16K | 11.7% | 0 |
| 2026-09-10 | 44K | 59K | 75.4% | 9,165 |
| 2026-09-09 | 704 | 1K | 61.1% | 0 |
| 2026-09-08 | 43K | 54K | 80.3% | 30,843 |
| 2026-09-04 | 3K | 8K | 35.9% | 0 |
| 2026-09-03 | 3K | 4K | 72.8% | 0 |
| 2026-09-02 | 2K | 4K | 48.9% | 0 |
| 2026-09-01 | 7K | 9K | 79.3% | 0 |
| 2026-08-31 | 161 | 5K | 3.1% | 0 |
| 2026-08-28 | 4K | 18K | 20.7% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 14 September 2026, the fails-to-deliver balance in SERA is 3 shares, down 15 shares over the last settlement date. Over the last 30 readings it ranged from 3 shares (14 September 2026) to 25,563 shares (5 August 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-14 | 3 | $2.03 | $6 |
| 2026-09-08 | 18 | $2.02 | $36 |
| 2026-09-02 | 27 | $2.08 | $56 |
| 2026-08-31 | 4 | $2.07 | $8 |
| 2026-08-13 | 7,702 | $2.02 | $16K |
| 2026-08-12 | 8,568 | $1.99 | $17K |
| 2026-08-11 | 182 | $2.01 | $366 |
| 2026-08-07 | 21,102 | $2.00 | $42K |
| 2026-08-06 | 24,254 | $2.00 | $49K |
| 2026-08-05 | 25,563 | $1.93 | $49K |
| 2026-08-04 | 314 | $2.10 | $659 |
| 2026-07-17 | 10 | $2.20 | $22 |
| 2026-06-26 | 2,022 | $1.80 | $4K |
| 2026-06-25 | 1,552 | $1.80 | $3K |
| 2026-06-24 | 942 | $1.84 | $2K |
| 2026-06-22 | 3,084 | $1.75 | $5K |
| 2026-06-18 | 1,795 | $1.89 | $3K |
| 2026-06-11 | 2,403 | $2.00 | $5K |
| 2026-06-10 | 6,151 | $2.13 | $13K |
| 2026-06-09 | 686 | $2.10 | $1K |
| 2026-05-27 | 1,637 | $2.15 | $4K |
| 2026-05-19 | 490 | $1.75 | $858 |
| 2026-05-14 | 13,717 | $1.59 | $22K |
| 2026-05-13 | 9,164 | $1.69 | $15K |
| 2026-05-04 | 2,128 | $1.91 | $4K |
| 2026-04-24 | 217 | $2.12 | $460 |
| 2026-04-23 | 343 | $2.14 | $734 |
| 2026-04-21 | 28 | $2.29 | $64 |
| 2026-04-20 | 65 | $2.30 | $150 |
| 2026-04-09 | 1,651 | $2.22 | $4K |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONInsiders at SERA reported 5 open-market sells worth $63K in the last 90 days and no open-market buys. Latest filing: Lindgardt Zhenya (Chief Executive Officer) on 2026-09-10.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-10 | Lindgardt Zhenya | Chief Executive Officer | Sell | 7K | $2.00 | $14K | 838K |
| 2026-09-10 | Jackson Benjamin | General Counsel | Sell | 2K | $2.00 | $4K | 160K |
| 2026-09-10 | Inglis Tiffany Eul Davis | Chief Medical Officer | Sell | 486 | $2.00 | $972 | 92K |
| 2026-09-10 | Anderson Dyaarl Lee Jr. | Chief Commercial Officer | Sell | 2K | $2.00 | $4K | 76K |
| 2026-09-08 | Lindgardt Zhenya | Chief Executive Officer | Sell | 20K | $2.00 | $40K | 845K |
| 2026-08-31 | Gleason Scott | Chief Financial Officer | Grant | 118K | $0.00 | $0 | 118K |
| 2026-07-10 | Phillips Joshua | Director | Grant | 2K | $0.00 | $0 | 82K |
| 2026-07-10 | Phillips Joshua | Director | Grant | 22K | $0.00 | $0 | 79K |
| 2026-07-10 | Mirza Mansoor Raza | Director | Grant | 2K | $0.00 | $0 | 82K |
| 2026-07-10 | Mirza Mansoor Raza | Director | Grant | 22K | $0.00 | $0 | 80K |
| 2026-07-10 | Lawrence Sandra AJ | Director | Grant | 2K | $0.00 | $0 | 41K |
| 2026-07-10 | Lawrence Sandra AJ | Director | Grant | 22K | $0.00 | $0 | 39K |
| 2026-07-10 | Kamdar Kim P. | Director | Grant | 3K | $0.00 | $0 | 58K |
| 2026-07-10 | Kamdar Kim P. | Director | Grant | 22K | $0.00 | $0 | 55K |
| 2026-07-10 | Capone Mark Christopher | Director | Grant | 2K | $0.00 | $0 | 44K |
| 2026-07-10 | Capone Mark Christopher | Director | Grant | 42K | $0.00 | $0 | 42K |
| 2026-07-10 | CRITCHFIELD GREGORY C | Director | Grant | 2K | $0.00 | $0 | 847K |
| 2026-07-10 | CRITCHFIELD GREGORY C | Director | Grant | 22K | $0.00 | $0 | 845K |
| 2026-07-10 | Barlow Jane F | Director | Grant | 2K | $0.00 | $0 | 47K |
| 2026-07-10 | Barlow Jane F | Director | Grant | 22K | $0.00 | $0 | 45K |
| 2026-06-11 | Jackson Benjamin | General Counsel | Sell | 2K | $2.01 | $4K | 162K |
| 2026-06-11 | Inglis Tiffany Eul Davis | Chief Medical Officer | Sell | 362 | $2.01 | $728 | 92K |
| 2026-06-11 | Lindgardt Zhenya | Chief Executive Officer | Sell | 7K | $2.01 | $14K | 865K |
| 2026-06-11 | Anderson Dyaarl Lee Jr. | Chief Commercial Officer | Sell | 5K | $2.01 | $10K | 78K |
| 2026-06-11 | Aerts Austin | Chief Financial Officer | Sell | 2K | $2.01 | $4K | 301K |
| 2026-06-09 | Lindgardt Zhenya | Chief Executive Officer | Sell | 21K | $2.08 | $43K | 872K |
| 2026-06-09 | Aerts Austin | Chief Financial Officer | Sell | 5K | $2.08 | $11K | 303K |
| 2026-06-08 | Lawrence Sandra AJ | Director | Sell | 2K | $2.15 | $3K | 16K |
| 2026-05-29 | Jackson Benjamin | General Counsel | Grant | 5K | $1.84 | $9K | 164K |
| 2026-05-29 | Anderson Dyaarl Lee Jr. | Chief Commercial Officer | Grant | 3K | $1.84 | $6K | 83K |
| 2026-03-12 | Lindgardt Zhenya | Chief Executive Officer | Grant | 154K | $0.00 | $0 | 893K |
| 2026-03-12 | Jackson Benjamin | General Counsel | Grant | 44K | $0.00 | $0 | 159K |
| 2026-03-12 | Inglis Tiffany Eul Davis | Chief Medical Officer | Grant | 17K | $0.00 | $0 | 92K |
| 2026-03-12 | Anderson Dyaarl Lee Jr. | Chief Commercial Officer | Grant | 12K | $0.00 | $0 | 80K |
| 2026-03-12 | Aerts Austin | Chief Financial Officer | Grant | 44K | $0.00 | $0 | 309K |
| 2026-03-11 | Lindgardt Zhenya | Chief Executive Officer | Sell | 3K | $2.04 | $6K | 738K |
| 2026-03-11 | Kearney Paul | Chief Data Officer | Sell | 1K | $2.04 | $3K | 164K |
| 2026-03-11 | Jackson Benjamin | General Counsel | Sell | 1K | $2.04 | $2K | 115K |
| 2026-03-11 | Harrison Robert Gardner | Chief Information Officer | Sell | 716 | $2.04 | $1K | 77K |
| 2026-03-11 | Boniface John J. | Chief Scientific Officer | Sell | 2K | $2.04 | $3K | 146K |
| 2026-03-11 | Aerts Austin | Chief Financial Officer | Sell | 1K | $2.04 | $2K | 264K |
| 2026-03-10 | Lindgardt Zhenya | Chief Executive Officer | Sell | 23K | $1.90 | $43K | 741K |
| 2026-03-10 | Aerts Austin | Chief Financial Officer | Sell | 6K | $1.90 | $12K | 265K |
| 2026-03-09 | Kearney Paul | Chief Data Officer | Sell | 2K | $1.96 | $4K | 165K |
| 2026-03-09 | Jackson Benjamin | General Counsel | Sell | 3K | $1.96 | $6K | 116K |
| 2026-03-09 | Harrison Robert Gardner | Chief Information Officer | Sell | 3K | $1.96 | $7K | 77K |
| 2026-03-09 | Boniface John J. | Chief Scientific Officer | Sell | 3K | $1.96 | $6K | 147K |
| 2026-03-09 | Aerts Austin | Chief Financial Officer | Sell | 674 | $1.96 | $1K | 272K |
| 2026-03-06 | Lawrence Sandra AJ | Director | Sell | 2K | $1.95 | $3K | 18K |
| 2026-02-24 | Harrison Robert Gardner | Chief Information Officer | Sell | 2K | $2.34 | $5K | 81K |
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.
Planned sales (Form 144)
Newest first. JSON50 Form 144 notices on file for SERA worth $725K at the prices reported; 7 in the last 90 days worth $94K. Latest: Lindgardt Zhenya filed on 2026-09-11 to sell 7,022 shares ($14K) from 2026-09-10.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-11 | Lindgardt ZhenyaOfficer, Director | 7K | $14K | 0.018% | 2026-09-10 | Morgan Stanley Smith Barney LLC |
| 2026-09-11 | Jackson BenjaminOfficer | 2K | $4K | 0.006% | 2026-09-10 | Morgan Stanley Smith Barney LLC |
| 2026-09-11 | Inglis Tiffany Eul DavisOfficer | 486 | $972 | 0.001% | 2026-09-10 | Morgan Stanley Smith Barney LLC |
| 2026-09-11 | Anderson Dyaarl Lee Jr.Officer | 2K | $4K | 0.005% | 2026-09-10 | Morgan Stanley Smith Barney LLC |
| 2026-09-11 | Aerts AustinOfficer | 2K | $3K | 0.004% | 2026-09-10 | Morgan Stanley Smith Barney LLC |
| 2026-09-09 | Lindgardt ZhenyaOfficer, Director | 20K | $40K | 0.051% | 2026-09-08 | Morgan Stanley Smith Barney LLC |
| 2026-09-09 | Aerts AustinOfficer | 14K | $27K | 0.034% | 2026-09-08 | Morgan Stanley Smith Barney LLC |
| 2026-06-15 | Lindgardt ZhenyaOfficer, Director | 7K | $14K | 0.018% | 2026-06-11 | Morgan Stanley Smith Barney LLC |
| 2026-06-15 | Jackson BenjaminOfficer | 2K | $4K | 0.006% | 2026-06-11 | Morgan Stanley Smith Barney LLC |
| 2026-06-15 | Inglis Tiffany Eul DavisOfficer | 362 | $726 | 0.001% | 2026-06-11 | Morgan Stanley Smith Barney LLC |
| 2026-06-15 | Anderson Dyaarl Lee Jr.Officer | 5K | $10K | 0.012% | 2026-06-11 | Morgan Stanley Smith Barney LLC |
| 2026-06-15 | Aerts AustinOfficer | 2K | $4K | 0.005% | 2026-06-11 | Morgan Stanley Smith Barney LLC |
| 2026-06-10 | Lindgardt ZhenyaOfficer, Director | 21K | $43K | 0.053% | 2026-06-09 | Morgan Stanley Smith Barney LLC |
| 2026-06-10 | Aerts AustinOfficer | 5K | $11K | 0.014% | 2026-06-09 | Morgan Stanley Smith Barney LLC |
| 2026-06-08 | SANDRA AJ LAWRENCEDirector | 2K | $4K | 0.004% | 2026-06-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-12 | PAUL KEARNEYOfficer | 7K | $12K | 0.018% | 2026-05-12 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-21 | ROBERT HARRISONOfficer | 2K | $5K | 0.005% | 2026-04-21 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-03-24 | ROBERT HARRISONOfficer | 2K | $4K | 0.005% | 2026-03-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-03-12 | Lindgardt ZhenyaOfficer, Director | 3K | $6K | 0.008% | 2026-03-11 | Morgan Stanley Smith Barney LLC |
| 2026-03-12 | Lindgardt ZhenyaOfficer, Director | 23K | $43K | 0.059% | 2026-03-10 | Morgan Stanley Smith Barney LLC |
| 2026-03-12 | Kearney PaulOfficer | 1K | $3K | 0.004% | 2026-03-11 | Morgan Stanley Smith Barney LLC |
| 2026-03-12 | Jackson BenjaminOfficer | 1K | $2K | 0.003% | 2026-03-11 | Morgan Stanley Smith Barney LLC |
| 2026-03-12 | Harrison Robert GardnerOfficer | 716 | $1K | 0.002% | 2026-03-11 | Morgan Stanley Smith Barney LLC |
| 2026-03-12 | Boniface John J.Officer | 2K | $3K | 0.004% | 2026-03-11 | Morgan Stanley Smith Barney LLC |
| 2026-03-12 | Aerts AustinOfficer | 1K | $2K | 0.003% | 2026-03-11 | Morgan Stanley Smith Barney LLC |
| 2026-03-12 | Aerts AustinOfficer | 6K | $12K | 0.016% | 2026-03-10 | Morgan Stanley Smith Barney LLC |
| 2026-03-10 | Kearney PaulOfficer | 2K | $4K | 0.005% | 2026-03-09 | Morgan Stanley Smith Barney LLC |
| 2026-03-10 | Jackson BenjaminOfficer | 3K | $6K | 0.008% | 2026-03-09 | Morgan Stanley Smith Barney LLC |
| 2026-03-10 | Harrison Robert GardnerOfficer | 3K | $7K | 0.009% | 2026-03-09 | Morgan Stanley Smith Barney LLC |
| 2026-03-10 | Boniface John J.Officer | 3K | $6K | 0.008% | 2026-03-09 | Morgan Stanley Smith Barney LLC |
| 2026-03-10 | Aerts AustinOfficer | 674 | $1K | 0.002% | 2026-03-09 | Morgan Stanley Smith Barney LLC |
| 2026-03-06 | SANDRA AJ LAWRENCEDirector | 2K | $3K | 0.004% | 2026-03-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-24 | ROBERT HARRISONOfficer | 2K | $5K | 0.005% | 2026-02-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-27 | ROBERT HARRISONOfficer | 2K | $6K | 0.005% | 2026-01-27 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-30 | ROBERT GARDNER HARRISONOfficer | 2K | $7K | 0.005% | 2025-12-30 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-11 | Lindgardt ZhenyaOfficer, Director | 4K | $14K | 0.011% | 2025-12-10 | Morgan Stanley Smith Barney LLC |
| 2025-12-11 | Kearney PaulOfficer | 1K | $4K | 0.003% | 2025-12-10 | Morgan Stanley Smith Barney LLC |
| 2025-12-11 | Jackson BenjaminOfficer | 892 | $3K | 0.002% | 2025-12-10 | Morgan Stanley Smith Barney LLC |
| 2025-12-11 | Harrison Robert GardnerOfficer | 616 | $2K | 0.002% | 2025-12-10 | Morgan Stanley Smith Barney LLC |
| 2025-12-11 | Boniface John J.Officer | 1K | $4K | 0.003% | 2025-12-10 | Morgan Stanley Smith Barney LLC |
| 2025-12-11 | Aerts AustinOfficer | 873 | $3K | 0.002% | 2025-12-10 | Morgan Stanley Smith Barney LLC |
| 2025-12-10 | Lindgardt ZhenyaOfficer, Director | 28K | $86K | 0.073% | 2025-12-09 | Morgan Stanley Smith Barney LLC |
| 2025-12-10 | Aerts AustinOfficer | 5K | $16K | 0.014% | 2025-12-09 | Morgan Stanley Smith Barney LLC |
| 2025-12-08 | SANDRA AJ LAWRENCEDirector | 2K | $5K | 0.004% | 2025-12-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-05 | Mirza Mansoor RazaDirector | 292 | $892 | 0.001% | 2025-12-05 | Morgan Stanley Smith Barney LLC |
| 2025-12-02 | PAUL KEARNEYOfficer | 32K | $95K | 0.086% | 2025-12-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-02 | ROBERT GARDNER HARRISONOfficer | 2K | $6K | 0.005% | 2025-12-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-26 | PAUL KEARNEYOfficer | 34K | $116K | 0.091% | 2025-11-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-12 | Lindgardt ZhenyaOfficer, Director | 12K | $30K | 0.030% | 2025-11-10 | Morgan Stanley Smith Barney LLC |
| 2025-11-12 | Kearney PaulOfficer | 7K | $19K | 0.019% | 2025-11-10 | Morgan Stanley Smith Barney LLC |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON4 holders report 5% or more of SERA in their latest filing, all on Schedule 13G (passive). The largest reported stake is Whetstone Capital Advisors, LLC at 8.6% of the class (3,306,889 shares), filed 2026-05-01 for an event on 2026-03-31.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-07-15 | 13G/Ano. 1 | Aberdeen Group plcparent holding company | 2.8M | 7.2% | 2026-06-30 |
| 2026-07-15 | 13G/Ano. 1 | abrdn Inc.corporation, investment adviser | 2.8M | 7.2% | 2026-06-30 |
| 2026-05-01 | 13G/Ano. 2 | Whetstone Capital Advisors, LLCother entity, investment adviser | 3.3M | 8.6% | 2026-03-31 |
| 2026-05-01 | 13G/Ano. 2 | David Atterburyparent holding company, individual | 3.3M | 8.6% | 2026-03-31 |
13F holders
Tracked managers holding SERA at their latest 13F. JSON3 of the 30 tracked managers held SERA at their latest 13F, $240K in total at quarter-end prices. Millennium Management is the largest at $135K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 0 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Millennium Management | 2026-06-30 | 74K | $135K | 0.00% | -18K |
| Citadel Advisors | 2026-06-30 | 41K | $75K | 0.00% | -207K |
| Two Sigma Investments | 2026-06-30 | 16K | $30K | 0.00% | -6K |
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. JSONIn Q2 FY 2026 (quarter ended 2026-06-30) Sera Prognostics reported revenue of $30K, up 76.5% from the same quarter a year earlier, and net loss of $9.1M (-0.18 diluted EPS). In FY 2025 it generated -$25.6M of operating cash flow.
- Cash
- $4.4M
- Equity
- $59.4M
- Total assets
- $86.7M
- Shares outstanding
- 29,293,831
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q2 FY 2026 | 2026-06-30 | $30K | -$9.1M | -30463.3% | -0.18 |
| Q1 FY 2026 | 2026-03-31 | $14K | -$8.4M | -59992.9% | -0.17 |
| Q4 FY 2025derived | 2025-12-31 | $10K | -$7.9M | -78810.0% | n/a |
| Q3 FY 2025 | 2025-09-30 | $16K | -$7.8M | -48837.5% | -0.16 |
| Q2 FY 2025 | 2025-06-30 | $17K | -$8.0M | -47329.4% | -0.16 |
| Q1 FY 2025 | 2025-03-31 | $38K | -$8.2M | -21544.7% | -0.20 |
| Q4 FY 2024derived | 2024-12-31 | $24K | -$8.6M | -35745.8% | n/a |
| Q3 FY 2024 | 2024-09-30 | $29K | -$7.9M | -27306.9% | -0.24 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | $81K | -$31.9M | -$25.6M | $726K | n/a | n/a |
| FY 2024 | 2024-12-31 | $77K | -$32.9M | -$14.2M | $56K | n/a | n/a |
| FY 2023 | 2023-12-31 | $306K | -$36.2M | -$27.2M | $128K | n/a | n/a |
| FY 2022 | 2022-12-31 | $268K | -$44.2M | -$34.6M | $791K | n/a | n/a |
| FY 2021 | 2021-12-31 | $82K | -$35.0M | -$31.6M | $1.3M | n/a | n/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 2021-08-25 from the cover page.
What this page is
Sera Prognostics 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 Sera Prognostics (SERA), SEC CIK 1534969, listed on Nasdaq, classified by the SEC as services-medical laboratories. 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 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-09.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-14.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-09-11.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 2026-07-15.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 2026-08-12.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 2026-09-10.JSON and CSV
- Company record
- EDGAR filing index for CIK 1534969Ticker, 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.
Other companies the SEC classifies as services-medical laboratories
Other company pages
Datasets
Frequently Asked Questions
How much of SERA is sold short?
What is SERA's daily short volume?
Does SERA have fails to deliver?
Are SERA insiders buying or selling?
Have SERA insiders filed to sell?
Who owns 5% or more of SERA?
What did SERA report last quarter?
Which tracked 13F managers own SERA?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.