Certara (CERT)
Certara on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as services-prepackaged software.
25.7M
Short interest
settlement 2026-10-15
8.4
Days to cover
-0.5 days vs prior
60.0%
Short share of volume
2026-11-02
14,988
Fails to deliver
settlement 2026-10-06
Thu 5 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. JSONAs of 15 October 2026, short interest in CERT is 25,681,536 shares, down 3,132,589 shares over the last month. Over the last 48 readings it ranged from 4,189,929 shares (31 December 2024) to 29,729,468 shares (15 July 2026). At the reported average volume of 3.0M shares a day that is 8.4 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-10-15 | 25,681,536 | -7.3% | 3,038,212 | 8.45 |
| 2026-09-30 | 27,704,005 | -3.9% | 3,087,647 | 8.97 |
| 2026-09-15 | 28,814,125 | -0.6% | 1,916,610 | 15.03 |
| 2026-08-31 | 28,972,317 | +14.8% | 2,213,335 | 13.09 |
| 2026-08-14 | 25,229,619 | -12.5% | 4,091,688 | 6.17 |
| 2026-07-31 | 28,839,594 | -3.0% | 3,731,192 | 7.73 |
| 2026-07-15 | 29,729,468 | +1.2% | 3,804,201 | 7.81 |
| 2026-06-30 | 29,382,164 | +3.0% | 5,834,599 | 5.04 |
| 2026-06-15 | 28,531,301 | -0.8% | 3,934,896 | 7.25 |
| 2026-05-29 | 28,750,194 | +13.7% | 3,896,266 | 7.38 |
| 2026-05-15 | 25,279,253 | +4.8% | 3,836,787 | 6.59 |
| 2026-04-30 | 24,121,303 | +7.2% | 2,810,111 | 8.58 |
| 2026-04-15 | 22,502,892 | +0.9% | 4,067,444 | 5.53 |
| 2026-03-31 | 22,291,831 | -6.3% | 4,831,763 | 4.61 |
| 2026-03-13 | 23,791,072 | +5.9% | 3,616,206 | 6.58 |
| 2026-02-27 | 22,461,223 | +2.6% | 3,033,966 | 7.40 |
| 2026-02-13 | 21,897,562 | +5.2% | 3,361,388 | 6.51 |
| 2026-01-30 | 20,810,829 | -3.5% | 1,745,965 | 11.92 |
| 2026-01-15 | 21,557,206 | +5.0% | 2,098,605 | 10.27 |
| 2025-12-31 | 20,536,709 | +11.4% | 2,125,693 | 9.66 |
| 2025-12-15 | 18,428,670 | -8.5% | 1,996,946 | 9.23 |
| 2025-11-28 | 20,132,940 | +10.6% | 2,237,400 | 9.00 |
| 2025-11-14 | 18,196,578 | +2.1% | 3,343,749 | 5.44 |
| 2025-10-31 | 17,813,224 | +12.3% | 1,505,057 | 11.84 |
| 2025-10-15 | 15,860,243 | +2.6% | 1,924,708 | 8.24 |
| 2025-09-30 | 15,451,223 | +5.0% | 1,956,958 | 7.90 |
| 2025-09-15 | 14,721,916 | +9.5% | 1,742,627 | 8.45 |
| 2025-08-29 | 13,439,477 | +6.6% | 1,080,048 | 12.44 |
| 2025-08-15 | 12,602,848 | +12.6% | 1,528,957 | 8.24 |
| 2025-07-31 | 11,194,948 | +13.8% | 1,491,061 | 7.51 |
| 2025-07-15 | 9,833,263 | +3.8% | 1,632,631 | 6.02 |
| 2025-06-30 | 9,475,827 | +5.8% | 2,117,670 | 4.47 |
| 2025-06-13 | 8,959,674 | +7.6% | 1,877,859 | 4.77 |
| 2025-05-30 | 8,323,567 | -2.2% | 1,265,319 | 6.58 |
| 2025-05-15 | 8,512,217 | -9.6% | 2,213,132 | 3.85 |
| 2025-04-30 | 9,415,989 | +3.8% | 1,969,620 | 4.78 |
| 2025-04-15 | 9,069,315 | +46.8% | 3,485,818 | 2.60 |
| 2025-03-31 | 6,177,739 | +4.5% | 1,179,154 | 5.24 |
| 2025-03-14 | 5,913,263 | +10.1% | 1,413,553 | 4.18 |
| 2025-02-28 | 5,370,322 | -13.0% | 1,483,122 | 3.62 |
| 2025-02-14 | 6,172,531 | +17.3% | 1,284,789 | 4.80 |
| 2025-01-31 | 5,264,151 | +18.8% | 1,430,463 | 3.68 |
| 2025-01-15 | 4,430,263 | +5.7% | 968,113 | 4.58 |
| 2024-12-31 | 4,189,929 | -1.6% | 1,120,029 | 3.74 |
| 2024-12-13 | 4,259,075 | -14.0% | 1,658,443 | 2.57 |
| 2024-11-29 | 4,954,097 | -0.1% | 985,775 | 5.03 |
| 2024-11-15 | 4,958,388 | -7.5% | 1,114,611 | 4.45 |
| 2024-10-31 | 5,359,623 | +31.3% | 1,215,865 | 4.41 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 2 November 2026, the short share of CERT volume is 60.0%, up 3.9 points over the last five sessions. Over the last 30 readings it ranged from 26.9% (22 October 2026) to 78.8% (24 September 2026). The latest reading is 10.9 points above the 30-session average of 49.1%, on 753K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-11-02 | 452K | 753K | 60.0% | 0 |
| 2026-10-30 | 240K | 517K | 46.4% | 0 |
| 2026-10-29 | 403K | 1.1M | 36.0% | 400 |
| 2026-10-28 | 391K | 847K | 46.2% | 0 |
| 2026-10-27 | 430K | 789K | 54.4% | 0 |
| 2026-10-26 | 345K | 615K | 56.1% | 198 |
| 2026-10-23 | 273K | 539K | 50.6% | 208 |
| 2026-10-22 | 263K | 979K | 26.9% | 0 |
| 2026-10-21 | 345K | 695K | 49.6% | 0 |
| 2026-10-20 | 384K | 865K | 44.3% | 0 |
| 2026-10-19 | 229K | 506K | 45.3% | 100 |
| 2026-10-16 | 390K | 718K | 54.3% | 0 |
| 2026-10-15 | 258K | 627K | 41.1% | 430 |
| 2026-10-14 | 354K | 652K | 54.2% | 111 |
| 2026-10-13 | 514K | 1.0M | 51.0% | 2,728 |
| 2026-10-12 | 251K | 495K | 50.6% | 0 |
| 2026-10-09 | 611K | 1.6M | 37.5% | 0 |
| 2026-10-08 | 511K | 1.1M | 48.3% | 0 |
| 2026-10-07 | 430K | 1.2M | 35.4% | 0 |
| 2026-10-06 | 611K | 1.3M | 48.1% | 9,036 |
| 2026-10-05 | 394K | 751K | 52.5% | 500 |
| 2026-10-02 | 329K | 737K | 44.6% | 63 |
| 2026-10-01 | 386K | 1.0M | 38.3% | 2,200 |
| 2026-09-30 | 333K | 687K | 48.5% | 0 |
| 2026-09-29 | 565K | 1.1M | 53.4% | 0 |
| 2026-09-28 | 432K | 970K | 44.5% | 0 |
| 2026-09-25 | 524K | 755K | 69.5% | 0 |
| 2026-09-24 | 397K | 504K | 78.8% | 0 |
| 2026-09-23 | 452K | 942K | 48.1% | 78 |
| 2026-09-22 | 299K | 506K | 59.1% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 6 October 2026, the fails-to-deliver balance in CERT is 14,988 shares, up 9,986 shares over the last settlement date. Over the last 30 readings it ranged from 53 shares (8 September 2026) to 1,189,746 shares (29 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-10-06 | 14,988 | $10.07 | $151K |
| 2026-09-29 | 5,002 | $9.13 | $46K |
| 2026-09-17 | 14,080 | $8.13 | $114K |
| 2026-09-16 | 154 | $8.40 | $1K |
| 2026-09-15 | 4,663 | $8.00 | $37K |
| 2026-09-08 | 53 | $7.94 | $421 |
| 2026-09-03 | 10,480 | $8.28 | $87K |
| 2026-09-01 | 6,167 | $8.29 | $51K |
| 2026-08-27 | 563 | $8.22 | $5K |
| 2026-08-25 | 7,531 | $7.96 | $60K |
| 2026-08-24 | 7,924 | $8.43 | $67K |
| 2026-08-14 | 13,992 | $8.15 | $114K |
| 2026-08-06 | 718 | $8.01 | $6K |
| 2026-08-04 | 3,802 | $8.18 | $31K |
| 2026-08-03 | 1,105,373 | $8.10 | $9.0M |
| 2026-07-17 | 501 | $7.28 | $4K |
| 2026-07-16 | 1,965 | $7.06 | $14K |
| 2026-07-08 | 66 | $7.17 | $473 |
| 2026-06-29 | 1,189,746 | $5.84 | $6.9M |
| 2026-06-25 | 2,202 | $5.43 | $12K |
| 2026-06-22 | 19,518 | $5.54 | $108K |
| 2026-06-17 | 3,087 | $6.05 | $19K |
| 2026-06-16 | 601,400 | $5.21 | $3.1M |
| 2026-06-02 | 2,103 | $6.12 | $13K |
| 2026-05-28 | 6,579 | $5.35 | $35K |
| 2026-05-26 | 276,984 | $5.24 | $1.5M |
| 2026-05-22 | 58,930 | $5.17 | $305K |
| 2026-05-21 | 1,822 | $4.67 | $9K |
| 2026-04-28 | 14,187 | $6.24 | $89K |
| 2026-04-27 | 946 | $6.32 | $6K |
Insider trades
SEC Form 4, newest first. JSONNo open-market insider trades were reported for CERT in the last 90 days. The most recent filings are listed below. Latest filing: Corcoran Daniel (SVP and General Counsel) on 2026-06-01.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-06-01 | Corcoran Daniel | SVP and General Counsel | Tax withholding | 8K | $5.82 | $46K | 32K |
| 2026-06-01 | Corcoran Daniel | SVP and General Counsel | Exercise or conversion | 15K | $0.00 | $0 | 40K |
| 2026-06-01 | Corcoran Daniel | SVP and General Counsel | Tax withholding | 4K | $5.82 | $25K | 25K |
| 2026-06-01 | Corcoran Daniel | SVP and General Counsel | Exercise or conversion | 8K | $0.00 | $0 | 29K |
| 2026-06-01 | Anhalt Rona | Chief Human Resources Officer | Tax withholding | 2K | $5.82 | $13K | 17K |
| 2026-06-01 | Anhalt Rona | Chief Human Resources Officer | Exercise or conversion | 7K | $0.00 | $0 | 19K |
| 2026-05-14 | Reynders John V W | Chief Financial Officer | Exercise or conversion | 16K | $0.00 | $0 | 26K |
| 2026-05-14 | Killefer Nancy | Director | Exercise or conversion | 16K | $0.00 | $0 | 52K |
| 2026-05-14 | Crane Rosemary A | Director | Exercise or conversion | 16K | $0.00 | $0 | 46K |
| 2026-05-14 | Collins Cynthia | Director | Exercise or conversion | 16K | $0.00 | $0 | 52K |
| 2026-05-14 | WALSH MATTHEW M | Director | Exercise or conversion | 16K | $0.00 | $0 | 213K |
| 2026-05-14 | CASHMAN JAMES E III | Director, Chairman | Exercise or conversion | 16K | $0.00 | $0 | 484K |
| 2026-05-14 | Bedi Arjun | Director | Exercise or conversion | 6K | $0.00 | $0 | 6K |
| 2026-05-14 | BROSHY ERAN | Director, Chairman | Exercise or conversion | 16K | $0.00 | $0 | 51K |
| 2026-05-11 | Resnick Jon Matthew | Chief Executive Officer | Tax withholding | 24K | $6.31 | $154K | 35K |
| 2026-05-11 | Resnick Jon Matthew | Chief Executive Officer | Exercise or conversion | 60K | $0.00 | $0 | 60K |
| 2026-04-01 | McKemey Adrian | President, Drug Dev. Solutions | Tax withholding | 3K | $5.70 | $15K | 8K |
| 2026-04-01 | McKemey Adrian | President, Drug Dev. Solutions | Exercise or conversion | 11K | $0.00 | $0 | 11K |
| 2026-04-01 | Corcoran Daniel | SVP and General Counsel | Tax withholding | 6K | $5.70 | $33K | 21K |
| 2026-04-01 | Corcoran Daniel | SVP and General Counsel | Exercise or conversion | 11K | $0.00 | $0 | 27K |
| 2026-04-01 | Gallagher John E | Chief Financial Officer | Tax withholding | 8K | $5.70 | $44K | 95K |
| 2026-04-01 | Gallagher John E | Chief Financial Officer | Exercise or conversion | 23K | $0.00 | $0 | 103K |
| 2026-04-01 | Gallagher John E | Chief Financial Officer | Tax withholding | 5K | $5.70 | $30K | 80K |
| 2026-04-01 | Gallagher John E | Chief Financial Officer | Exercise or conversion | 15K | $0.00 | $0 | 86K |
| 2026-04-01 | Gallagher John E | Chief Financial Officer | Tax withholding | 4K | $0.00 | $0 | 70K |
| 2026-04-01 | Gallagher John E | Chief Financial Officer | Exercise or conversion | 13K | $0.00 | $0 | 75K |
| 2026-04-01 | Gallagher John E | Chief Financial Officer | Tax withholding | 8K | $5.70 | $44K | 62K |
| 2026-04-01 | Gallagher John E | Chief Financial Officer | Grant | 23K | $0.00 | $0 | 70K |
| 2026-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 4K | $5.70 | $21K | 110K |
| 2026-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Exercise or conversion | 15K | $0.00 | $0 | 114K |
| 2026-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 2K | $5.70 | $14K | 99K |
| 2026-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Exercise or conversion | 10K | $0.00 | $0 | 101K |
| 2026-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 2K | $5.70 | $11K | 91K |
| 2026-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Exercise or conversion | 8K | $0.00 | $0 | 93K |
| 2026-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 4K | $5.70 | $20K | 85K |
| 2026-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Grant | 15K | $0.00 | $0 | 88K |
| 2026-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Tax withholding | 7K | $5.70 | $41K | 332K |
| 2026-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Exercise or conversion | 15K | $0.00 | $0 | 340K |
| 2026-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Tax withholding | 5K | $5.70 | $27K | 324K |
| 2026-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Exercise or conversion | 10K | $0.00 | $0 | 329K |
| 2026-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Tax withholding | 4K | $5.70 | $21K | 319K |
| 2026-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Exercise or conversion | 8K | $0.00 | $0 | 323K |
| 2026-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Tax withholding | 7K | $5.70 | $39K | 315K |
| 2026-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Grant | 15K | $0.00 | $0 | 322K |
| 2026-04-01 | Anhalt Rona | Chief Human Resources Officer | Tax withholding | 3K | $5.70 | $17K | 12K |
| 2026-04-01 | Anhalt Rona | Chief Human Resources Officer | Exercise or conversion | 10K | $0.00 | $0 | 15K |
| 2025-11-11 | Feehery William F | CHIEF EXECUTIVE OFFICER | Buy | 24K | $8.30 | $200K | 2.4M |
| 2025-11-11 | Feehery William F | CHIEF EXECUTIVE OFFICER | Buy | 24K | $8.30 | $200K | 2.4M |
| 2025-09-09 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Sell | 51K | $10.92 | $559K | 74K |
| 2025-05-30 | Corcoran Daniel | SVP and General Counsel | Exercise or conversion | 8K | $0.00 | $0 | 8K |
| 2025-05-30 | Corcoran Daniel | SVP and General Counsel | Tax withholding | 2K | $11.40 | $26K | 6K |
| 2025-05-30 | Corcoran Daniel | SVP and General Counsel | Exercise or conversion | 15K | $0.00 | $0 | 21K |
| 2025-05-30 | Corcoran Daniel | SVP and General Counsel | Tax withholding | 4K | $11.40 | $49K | 16K |
| 2025-05-30 | Anhalt Rona | Chief Human Resources Officer | Tax withholding | 2K | $11.40 | $22K | 5K |
| 2025-05-30 | Anhalt Rona | Chief Human Resources Officer | Exercise or conversion | 7K | $0.00 | $0 | 7K |
| 2025-05-21 | BROSHY ERAN | Director,Other | Exercise or conversion | 12K | $0.00 | $0 | 35K |
| 2025-05-21 | CASHMAN JAMES E III | Director,Other | Exercise or conversion | 12K | $0.00 | $0 | 468K |
| 2025-05-21 | Collins Cynthia | Director | Exercise or conversion | 12K | $0.00 | $0 | 36K |
| 2025-05-21 | Crane Rosemary A | Director | Exercise or conversion | 12K | $0.00 | $0 | 30K |
| 2025-05-21 | Killefer Nancy | Director | Exercise or conversion | 12K | $0.00 | $0 | 36K |
| 2025-05-21 | Reynders John V W | Director | Exercise or conversion | 11K | $0.00 | $0 | 11K |
| 2025-05-21 | WALSH MATTHEW M | Director | Exercise or conversion | 12K | $0.00 | $0 | 198K |
| 2025-04-01 | Feehery William F | CHIEF EXECUTIVE OFFICER | Tax withholding | 8K | $9.90 | $82K | 2.3M |
| 2025-04-01 | Feehery William F | CHIEF EXECUTIVE OFFICER | Grant | 30K | $0.00 | $0 | 2.3M |
| 2025-04-01 | Feehery William F | CHIEF EXECUTIVE OFFICER | Exercise or conversion | 37K | $0.00 | $0 | 2.3M |
| 2025-04-01 | Feehery William F | CHIEF EXECUTIVE OFFICER | Tax withholding | 14K | $9.90 | $137K | 2.3M |
| 2025-04-01 | Feehery William F | CHIEF EXECUTIVE OFFICER | Exercise or conversion | 33K | $0.00 | $0 | 2.3M |
| 2025-04-01 | Feehery William F | CHIEF EXECUTIVE OFFICER | Tax withholding | 14K | $9.90 | $140K | 2.3M |
| 2025-04-01 | Feehery William F | CHIEF EXECUTIVE OFFICER | Exercise or conversion | 42K | $0.00 | $0 | 2.4M |
| 2025-04-01 | Feehery William F | CHIEF EXECUTIVE OFFICER | Tax withholding | 18K | $9.90 | $175K | 2.3M |
| 2025-04-01 | Gallagher John E | PRESIDENT, CHIEF COMMERCAL OFF | Exercise or conversion | 15K | $0.00 | $0 | 52K |
| 2025-04-01 | Gallagher John E | PRESIDENT, CHIEF COMMERCAL OFF | Exercise or conversion | 15K | $0.00 | $0 | 33K |
| 2025-04-01 | Gallagher John E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 5K | $9.90 | $52K | 47K |
| 2025-04-01 | Gallagher John E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 4K | $9.90 | $43K | 37K |
| 2025-04-01 | Gallagher John E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 5K | $9.90 | $46K | 28K |
| 2025-04-01 | Gallagher John E | PRESIDENT, CHIEF COMMERCAL OFF | Exercise or conversion | 13K | $0.00 | $0 | 41K |
| 2025-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Exercise or conversion | 9K | $0.00 | $0 | 114K |
| 2025-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 2K | $9.90 | $24K | 125K |
| 2025-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 2K | $9.90 | $19K | 118K |
| 2025-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Exercise or conversion | 8K | $0.00 | $0 | 119K |
| 2025-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 2K | $9.90 | $21K | 112K |
| 2025-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Exercise or conversion | 10K | $0.00 | $0 | 128K |
| 2025-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Tax withholding | 2K | $9.90 | $17K | 105K |
| 2025-04-01 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Grant | 7K | $0.00 | $0 | 107K |
| 2025-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Tax withholding | 4K | $9.90 | $40K | 298K |
| 2025-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Exercise or conversion | 9K | $0.00 | $0 | 302K |
| 2025-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Tax withholding | 3K | $9.90 | $33K | 293K |
| 2025-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Tax withholding | 5K | $9.90 | $47K | 307K |
| 2025-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Exercise or conversion | 8K | $0.00 | $0 | 306K |
| 2025-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Tax withholding | 4K | $9.90 | $37K | 302K |
| 2025-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Exercise or conversion | 10K | $0.00 | $0 | 312K |
| 2025-04-01 | Aspbury Robert | PRESIDENT, PREDICTIVE TECH | Grant | 7K | $0.00 | $0 | 296K |
| 2024-10-07 | SMITH PATRICK F | PRESIDENT, DRUG DEV SOLUTIONS | Sell | 5K | $11.03 | $60K | 50K |
| 2024-10-04 | SMITH PATRICK F | PRESIDENT, DRUG DEV SOLUTIONS | Tax withholding | 2K | $10.99 | $19K | 56K |
| 2024-10-04 | SMITH PATRICK F | PRESIDENT, DRUG DEV SOLUTIONS | Exercise or conversion | 7K | $0.00 | $0 | 57K |
| 2024-09-09 | Pedersen Leif E | PRESIDENT, CHIEF COMMERCAL OFF | Sell | 51K | $11.29 | $578K | 100K |
| 2024-07-01 | Aspbury Robert | PRESIDENT, SCIENTIFIC SOFTWARE | Tax withholding | 862 | $13.85 | $12K | 289K |
| 2024-05-21 | BROSHY ERAN | Director | Exercise or conversion | 9K | $0.00 | $0 | 23K |
| 2024-05-21 | CASHMAN JAMES E III | Director,Other | Exercise or conversion | 9K | $0.00 | $0 | 457K |
| 2024-05-21 | Collins Cynthia | Director | Exercise or conversion | 9K | $0.00 | $0 | 24K |
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. JSON1 Form 144 notice on file for CERT worth $300K at the prices reported; 1 in the last 90 days worth $300K. Latest: Pedersen Leif E filed on 2026-09-03 to sell 36,066 shares ($300K) from 2026-09-03.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-03 | Pedersen Leif EOfficer | 36K | $300K | 0.024% | 2026-09-03 | Fidelity Brokerage Services LLC |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON1 holder reports 5% or more of CERT in its latest filing, on Schedule 13G (passive). The holder is BlackRock, Inc. at 11.6% of the class (18,032,062 shares), filed 2026-07-08 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-07-14 | 13G/Ano. 1 | Dimensional Fund Advisors LPinvestment adviser | 6.0M | 3.9% | 2026-06-30 |
| 2026-07-08 | 13G/Ano. 1 | BlackRock, Inc.parent holding company | 18.0M | 11.6% | 2026-06-30 |
| 2026-04-06 | 13G/Ano. 3 | Wasatch Advisors LPinvestment adviser | 5.3M | 3.3% | 2026-03-31 |
| 2026-03-26 | 13G/Ano. 3 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
| 2025-11-25 | 13G/Ano. 1 | Deerfield Mgmt, L.P.partnership | 7.8M | 4.9% | 2025-11-25 |
| 2025-11-25 | 13G/Ano. 1 | Deerfield Management Company, L.P.partnership | 7.8M | 4.9% | 2025-11-25 |
| 2025-11-25 | 13G/Ano. 1 | Deerfield Partners, L.P.partnership | 7.8M | 4.9% | 2025-11-25 |
| 2025-11-25 | 13G/Ano. 1 | James E. Flynnindividual | 7.8M | 4.9% | 2025-11-25 |
13F holders
Tracked managers holding CERT at their latest 13F. JSON7 of the 30 tracked managers held CERT at their latest 13F, $55.6M in total at quarter-end prices. Millennium Management is the largest at $16.7M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 2 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Millennium Management | 2026-06-30 | 2.6M | $16.7M | 0.01% | +1.3M |
| AQR Capital Management | 2026-06-30 | 2.2M | $13.8M | 0.00% | +1.6M |
| Two Sigma Investments | 2026-06-30 | 1.1M | $7.2M | 0.01% | +1.0M |
| Citadel Advisors | 2026-06-30 | 1.1M | $7.2M | 0.00% | -3.5M |
| Renaissance Technologies | 2026-06-30 | 685K | $4.5M | 0.01% | +330K |
| D. E. Shaw & Co. | 2026-06-30 | 568K | $3.7M | 0.00% | +250K |
| Point72 Asset Management | 2026-06-30 | 383K | $2.5M | 0.00% | -736K |
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.
What this page is
Certara 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 Certara (CERT), SEC CIK 1827090, listed on Nasdaq, classified by the SEC as services-prepackaged software. 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 2026-10-06.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 2026-09-03.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 2026-07-14.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
- 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 2026-08-04.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 2026-06-01.JSON and CSV
- Company record
- EDGAR filing index for CIK 1827090Ticker, 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.
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Datasets
Frequently Asked Questions
How much of CERT is sold short?
25,681,536 shares were held short at the 2026-10-15 settlement, 8.4 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 CERT's daily short volume?
On 2026-11-02, 451,565 of the 752,734 CERT shares reported to FINRA were sold short, 60.0% of the day's reported volume. Short volume is a flow for one day, not a position.
Does CERT have fails to deliver?
The SEC's latest file shows 14,988 CERT shares failed to deliver at settlement 2026-10-06. Fails are reported per settlement date and published twice a month with a lag.
Are CERT insiders buying or selling?
No open-market insider trades were reported for CERT in the last 90 days. The most recent filings are listed below. Latest filing: Corcoran Daniel (SVP and General Counsel) on 2026-06-01.
Have CERT insiders filed to sell?
1 Form 144 notice on file for CERT worth $300K at the prices reported; 1 in the last 90 days worth $300K. Latest: Pedersen Leif E filed on 2026-09-03 to sell 36,066 shares ($300K) from 2026-09-03.
Who owns 5% or more of CERT?
1 holder reports 5% or more of CERT in its latest filing, on Schedule 13G (passive). The holder is BlackRock, Inc. at 11.6% of the class (18,032,062 shares), filed 2026-07-08 for an event on 2026-06-30.
Which tracked 13F managers own CERT?
7 of the 30 tracked 13F managers held CERT shares at their latest filing, $55.6M in all. The largest: Izzy Englander's Millennium Management (2.6M shares, $16.7M), Cliff Asness's AQR Capital Management (2.2M shares, $13.8M), Two Sigma Investments (1.1M shares, $7.2M), Ken Griffin's Citadel Advisors (1.1M shares, $7.2M), Renaissance Technologies (685K shares, $4.5M), D. E. Shaw & Co. (568K shares, $3.7M). The table above lists all 7.
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.