Services-Medical Laboratories
Standard Industrial Classification: SIC 8071
Industry Insider Sentiment Analysis
The Services-Medical Laboratories sector (SIC 8071) acts as a critical barometer for broader economic health. Our real-time monitoring reveals total transactions. Monitoring "cluster buying" is one of the most reliable leading indicators for future sector performance. By analyzing aggregate data across this specific Standard Industrial Classification, investors can filter out individual company volatility and identify high-conviction trends. When multiple directors and officers within the same industry move capital simultaneously, it often signals an upcoming sector-wide revaluation or a fundamental shift in supply chain dynamics that has yet to be recognized by the broader public market.
| Filing Date | Trade Date | Ticker | Company | Reporting Person | Relationship | Type | Price | Qty | Total, $ | Owned After |
|---|---|---|---|---|---|---|---|---|---|---|
| 2026-01-28 01:12 | 2026-01-27 | SERA | SERA PROGNOSTICS, INC. | Harrison Robert Gardner | Officer | SELL | $2.97 | 2,000 | $5,940 | 82,788 |
| 2026-01-27 17:29 | 2026-01-23 | BDSX | BIODESIX INC | SCHULER JACK W | 10% owner | BUY | $11.81 | 100,000 | $1,180,740 | 1,563,210 |
| 2026-01-26 17:28 | 2026-01-22 | BDSX | BIODESIX INC | SCHULER JACK W | 10% owner | BUY | $10.96 | 82,465 | $903,561 | 1,463,210 |
| 2026-01-24 02:03 | 2026-01-22 | PSNL | Personalis, Inc. | Tachibana Aaron | Officer | OPT+S | $11.50 | 1,201 | $13,812 | 164,458 |
| 2026-01-24 01:58 | 2026-01-21 | CDNA | CareDx, Inc. | Hanna John Walter JR | Director, Officer | SELL | $21.16 | 19,480 | $412,222 | 597,405 |
| 2026-01-23 05:05 | 2026-01-20 | NTRA | Natera, Inc. | Fesko John | Officer | SELL | $234.74 | 18,145 | $4,259,417 | 177,252 |
| 2026-01-23 05:05 | 2026-01-20 | NTRA | Natera, Inc. | Moshkevich Solomon | Officer | SELL | $234.74 | 23,498 | $5,515,960 | 144,699 |
| 2026-01-23 05:05 | 2026-01-20 | NTRA | Natera, Inc. | RABINOWITZ DANIEL | Officer | OPT+S | $234.74 | 19,672 | $4,617,888 | 227,033 |
| 2026-01-23 05:35 | 2026-01-20 | NTRA | Natera, Inc. | Chapman Steven Leonard | Director, Officer | OPT+S | $234.74 | 73,522 | $17,258,856 | 219,150 |
| 2026-01-23 05:35 | 2026-01-20 | NTRA | Natera, Inc. | Brophy Michael Burkes | Officer | OPT+S | $239.49 | 61,123 | $14,638,103 | 64,123 |
| 2026-01-23 05:05 | 2026-01-20 | NTRA | Natera, Inc. | Sheena Jonathan | Director | OPT+S | $234.60 | 6,144 | $1,441,367 | 264,078 |
| 2026-01-23 01:45 | 2026-01-21 | GH | Guardant Health, Inc. | Monroe Terilyn J. | Officer | SELL | $114.09 | 8,571 | $977,902 | 20,990 |
| 2026-01-23 00:15 | 2026-01-20 | CSTL | CASTLE BIOSCIENCES INC | MAETZOLD DEREK J | Director, Officer | SELL | $40.01 | 4,017 | $160,732 | 87,715 |
| 2026-01-21 00:22 | 2026-01-16 | BDSX | BIODESIX INC | Vazquez Chris | Officer | OPT+S | $8.15 | 83 | $676 | 1,072 |
| 2026-01-21 00:21 | 2026-01-16 | BDSX | BIODESIX INC | Pestano Gary Anthony | Officer | OPT+S | $8.15 | 298 | $2,428 | 8,446 |
| 2026-01-21 00:21 | 2026-01-16 | BDSX | BIODESIX INC | O'Kane Kieran | Officer | OPT+S | $8.15 | 298 | $2,428 | 7,869 |
| 2026-01-21 00:21 | 2026-01-16 | BDSX | BIODESIX INC | Hutton Scott | Director, Officer | OPT+S | $8.15 | 970 | $7,905 | 38,974 |
| 2026-01-21 00:21 | 2026-01-16 | BDSX | BIODESIX INC | Cowie Robin Harper | Officer | OPT+S | $8.15 | 298 | $2,428 | 13,654 |
| 2026-01-21 01:30 | 2026-01-15 | CDNA | CareDx, Inc. | Hanna John Walter JR | Director, Officer | SELL | $21.05 | 10,156 | $213,804 | 616,885 |
| 2026-01-10 00:09 | 2026-01-07 | GH | Guardant Health, Inc. | Monroe Terilyn J. | Officer | SELL | $112.08 | 10,031 | $1,124,279 | 20,990 |
| 2026-01-08 00:06 | 2026-01-05 | CSTL | CASTLE BIOSCIENCES INC | MAETZOLD DEREK J | Director, Officer | SELL | $38.76 | 4,017 | $155,694 | 29,513 |
| 2026-01-07 05:05 | 2026-01-02 | NTRA | Natera, Inc. | Moshkevich Solomon | Officer | SELL | $228.95 | 2,951 | $675,621 | 123,499 |
| 2026-01-07 05:05 | 2026-01-02 | NTRA | Natera, Inc. | Chapman Steven Leonard | Director, Officer | SELL | $229.08 | 3,848 | $881,482 | 136,568 |
| 2025-12-31 02:41 | 2025-12-30 | SERA | SERA PROGNOSTICS, INC. | Harrison Robert Gardner | Officer | SELL | $3.00 | 2,000 | $6,000 | 84,788 |
| 2025-12-30 00:07 | 2025-12-22 | CSTL | CASTLE BIOSCIENCES INC | MAETZOLD DEREK J | Director, Officer | SELL | $40.35 | 830 | $33,491 | 33,530 |
| 2025-12-23 04:05 | 2025-12-19 | NTRA | Natera, Inc. | Sheena Jonathan | Director | SELL | $225.94 | 1,500 | $338,914 | 22,532 |
| 2025-12-20 00:06 | 2025-12-17 | CSTL | CASTLE BIOSCIENCES INC | Oelschlager Kristen M | Officer | SELL | $39.31 | 14,888 | $585,292 | 12,323 |
| 2025-12-20 00:06 | 2025-12-17 | CSTL | CASTLE BIOSCIENCES INC | MAETZOLD DEREK J | Director, Officer | SELL | $40.04 | 509 | $20,380 | 34,360 |
| 2025-12-19 02:33 | 2025-12-17 | GH | Guardant Health, Inc. | Tariq Musa | Director | SELL | $101.46 | 116 | $11,769 | 7,993 |
| 2025-12-18 04:35 | 2025-12-17 | NTRA | Natera, Inc. | Sheena Jonathan | Director | SELL | $227.01 | 3,070 | $696,912 | 222,966 |
| 2025-12-18 03:17 | 2025-12-15 | GH | Guardant Health, Inc. | Chudova Darya | Officer | SELL | $104.04 | 5,451 | $567,132 | 7,012 |
| 2025-12-18 03:18 | 2025-12-15 | GH | Guardant Health, Inc. | Eltoukhy Helmy | Director, Officer | SELL | $103.82 | 90,565 | $9,402,223 | 2,047,143 |
| 2025-12-18 00:35 | 2025-12-16 | VCYT | VERACYTE, INC. | McGuire Annie | Officer | SELL | $43.13 | 10,739 | $463,203 | 67,760 |
| 2025-12-18 00:20 | 2025-12-15 | CSTL | CASTLE BIOSCIENCES INC | MAETZOLD DEREK J | Director, Officer | SELL | $38.69 | 32,346 | $1,251,399 | 34,869 |
| 2025-12-17 05:05 | 2025-12-12 | NTRA | Natera, Inc. | Moshkevich Solomon | Officer | OPT+S | $230.76 | 4,692 | $1,082,714 | 113,065 |
| 2025-12-17 05:05 | 2025-12-12 | NTRA | Natera, Inc. | ROSENMAN HERM | Director | SELL | $227.42 | 48,419 | $11,011,478 | 20,342 |
| 2025-12-16 00:09 | 2025-12-11 | CSTL | CASTLE BIOSCIENCES INC | Juvenal Tobin W | Officer | SELL | $37.48 | 13,200 | $494,736 | 86,825 |
| 2025-12-16 00:08 | 2025-12-11 | CSTL | CASTLE BIOSCIENCES INC | Stokes Frank | Officer | SELL | $37.45 | 4,496 | $168,375 | 50,326 |
| 2025-12-13 03:39 | 2025-12-11 | CAI | Caris Life Sciences, Inc. | Power Luke Thomas | Officer | OPT+S | $26.58 | 62,250 | $1,654,462 | 99,571 |
| 2025-12-12 03:58 | 2025-12-10 | SERA | SERA PROGNOSTICS, INC. | Lindgardt Zhenya | Director, Officer | SELL | $3.31 | 4,155 | $13,753 | 763,926 |
| 2025-12-12 03:57 | 2025-12-10 | SERA | SERA PROGNOSTICS, INC. | Kearney Paul | Officer | SELL | $3.31 | 1,213 | $4,015 | 167,383 |
| 2025-12-12 03:57 | 2025-12-10 | SERA | SERA PROGNOSTICS, INC. | Jackson Benjamin | Officer | SELL | $3.31 | 892 | $2,953 | 118,866 |
| 2025-12-12 03:56 | 2025-12-10 | SERA | SERA PROGNOSTICS, INC. | Boniface John J. | Officer | SELL | $3.31 | 1,332 | $4,409 | 150,397 |
| 2025-12-12 03:56 | 2025-12-10 | SERA | SERA PROGNOSTICS, INC. | Aerts Austin | Officer | SELL | $3.31 | 873 | $2,890 | 272,214 |
| 2025-12-12 03:56 | 2025-12-10 | SERA | SERA PROGNOSTICS, INC. | Harrison Robert Gardner | Officer | SELL | $3.31 | 616 | $2,039 | 86,788 |
| 2025-12-11 05:31 | 2025-12-08 | GH | Guardant Health, Inc. | Chudova Darya | Officer | SELL | $105.43 | 22,935 | $2,417,980 | 54,480 |
| 2025-12-11 05:32 | 2025-12-08 | GH | Guardant Health, Inc. | Kalia Kumud | Officer | SELL | $104.60 | 2,000 | $209,204 | 22,365 |
| 2025-12-11 05:32 | 2025-12-08 | GH | Guardant Health, Inc. | Hidalgo Medina Manuel | Director | OPT+S | $105.00 | 1,250 | $131,250 | 797 |
| 2025-12-11 05:33 | 2025-12-08 | GH | Guardant Health, Inc. | Talasaz AmirAli | Director, Officer | SELL | $105.05 | 100,000 | $10,505,470 | 168,223 |
| 2025-12-11 03:24 | 2025-12-09 | SERA | SERA PROGNOSTICS, INC. | Lindgardt Zhenya | Director, Officer | SELL | $3.04 | 28,215 | $85,774 | 768,081 |
Sector-Wide Insider Alpha
Analyzing insider movements across the Services-Medical Laboratories sector provides a macro-view of executive conviction. When multiple leaders in different companies within the same SIC code (8071) simultaneously buy shares, it often indicates an industry-wide undervaluation or a positive shift in market cycles.
SEC Filings in Services-Medical Laboratories
Every transaction in the Services-Medical Laboratories industry is reported via Form 4 disclosures. By filtering these filings by industry, investors can detect institutional-scale sentiment shifts before they are reflected in broader market indices, following the capital flow of those with intimate industry knowledge.
UNDERSTANDING THE DATA
FILING DATE: The date and time when the transaction was reported to the SEC. This is when the public first receives the information.
TRADE DATE: The actual day the insider executed the purchase or sale in the market.
INDUSTRY: The specific market sector the company operates in. Useful for identifying broader institutional capital flows across sectors.
OWNED AFTER: The total number of shares held by the insider following the transaction. This highlights the insider's remaining conviction in the company.
CHANGE %: The percentage increase or decrease of the insider's total position. Large percentage changes often carry more weight than the dollar amount alone.
TRADE TYPES DEFINITIONS
BUY: An open market purchase. Typically indicates an insider's belief that the stock is undervalued or poised for growth.
SELL: An open market sale. While often used for diversification or liquidity, large or unexpected sales can be a warning signal.
OPT+S (OPTION EXERCISE & SALE): This occurs when an insider exercises their stock options and sells them immediately. Often part of a structured compensation plan.