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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2026-10-07 20:10 | 2026-10-05 | CSTL | CASTLE BIOSCIENCES INC | MAETZOLD DEREK J | Director, Officer | OPT+S | $35.57 | 14,496 | $515,565 | 6,832 |
| 2026-10-07 23:56 | 2026-10-05 | BLLN | BillionToOne, Inc. | Tsao David | Director, Officer | OPT+S | $108.15 | 20,000 | $2,162,950 | 1,000 |
| 2026-10-07 23:56 | 2026-10-05 | BLLN | BillionToOne, Inc. | ten Bosch John Roderick | Officer | SELL | $105.15 | 2,834 | $297,995 | 19,385 |
| 2026-10-07 22:36 | 2026-10-05 | GRAL | GRAIL, Inc. | Freidin Aaron | Officer | SELL | $146.39 | 23,619 | $3,457,585 | 225,364 |
| 2026-10-07 22:36 | 2026-10-05 | GRAL | GRAIL, Inc. | Partridge Andrew John | Officer | SELL | $146.39 | 7,873 | $1,152,528 | 155,865 |
| 2026-10-05 20:07 | 2026-10-01 | CSTL | CASTLE BIOSCIENCES INC | Oelschlager Kristen M | Officer | OPT+S | $35.95 | 4,153 | $149,318 | 13,356 |
| 2026-10-03 01:35 | 2026-10-01 | NTRA | Natera, Inc. | Moshkevich Solomon | Officer | SELL | $414.22 | 3,000 | $1,242,645 | 106,914 |
| 2026-10-03 01:35 | 2026-10-01 | NTRA | Natera, Inc. | Chapman Steven Leonard | Director, Officer | SELL | $413.31 | 1,273 | $526,144 | 96,926 |
| 2026-10-01 20:21 | 2026-09-29 | CSTL | CASTLE BIOSCIENCES INC | Juvenal Tobin W | Officer | SELL | $35.29 | 6,577 | $232,128 | 52,007 |
| 2026-10-01 00:33 | 2026-09-28 | BLLN | BillionToOne, Inc. | Atay Oguzhan | Director, Officer | OPT+S | $120.64 | 10,999 | $1,326,919 | 154,502 |
| 2026-09-28 21:56 | 2026-09-24 | BLLN | BillionToOne, Inc. | ten Bosch John Roderick | Officer | SELL | $120.00 | 1,416 | $169,920 | 22,219 |
| 2026-09-28 21:57 | 2026-09-24 | BLLN | BillionToOne, Inc. | Tsao David | Director, Officer | OPT+S | $125.00 | 3,333 | $416,625 | 1,000 |
| 2026-09-26 01:35 | 2026-09-23 | NTRA | Natera, Inc. | Sheena Jonathan | Director | SELL | $388.01 | 18,064 | $7,008,973 | 9,000 |
| 2026-09-23 21:50 | 2026-09-21 | BLLN | BillionToOne, Inc. | ten Bosch John Roderick | Officer | SELL | $106.61 | 1,416 | $150,960 | 23,635 |
| 2026-09-23 21:06 | 2026-09-22 | CAI | Caris Life Sciences, Inc. | Denton John Russel | Officer | SELL | $31.82 | 7,500 | $238,626 | 174,855 |
| 2026-09-23 20:37 | 2026-09-21 | GRAL | GRAIL, Inc. | Ofman Joshua J. | Director, Officer | OPT+S | $97.74 | 61,452 | $6,006,380 | 362,271 |
| 2026-09-23 20:37 | 2026-09-21 | GRAL | GRAIL, Inc. | Freidin Aaron | Officer | SELL | $93.34 | 4,100 | $382,679 | 248,983 |
| 2026-09-23 20:27 | 2026-09-21 | CSTL | CASTLE BIOSCIENCES INC | MAETZOLD DEREK J | Director, Officer | OPT+S | $35.33 | 14,496 | $512,202 | 9,550 |
| 2026-09-22 20:10 | 2026-09-18 | PSNL | Personalis, Inc. | Moore Stephen Michael | Officer | SELL | $16.22 | 2,068 | $33,543 | 90,257 |
| 2026-09-22 20:10 | 2026-09-18 | PSNL | Personalis, Inc. | Chen Richard | Officer | SELL | $16.22 | 3,998 | $64,848 | 169,882 |
| 2026-09-22 20:10 | 2026-09-18 | PSNL | Personalis, Inc. | Hall Christopher M | Director, Officer | SELL | $16.22 | 7,459 | $120,985 | 228,527 |
| 2026-09-22 20:10 | 2026-09-18 | PSNL | Personalis, Inc. | Tachibana Aaron | Officer | SELL | $16.22 | 2,931 | $47,541 | 195,902 |
| 2026-09-22 21:16 | 2026-09-21 | VCYT | VERACYTE, INC. | Leite John | Officer | SELL | $40.00 | 4,015 | $160,600 | 124,329 |
| 2026-09-21 23:00 | 2026-09-17 | BLLN | BillionToOne, Inc. | Lynch Thomas P. | Officer | OPT+S | $110.33 | 35,112 | $3,873,967 | 700 |
| 2026-09-18 01:35 | 2026-09-15 | NTRA | Natera, Inc. | Sheena Jonathan | Director | SELL | $351.49 | 9,150 | $3,216,144 | 221,314 |
| 2026-09-17 22:08 | 2026-09-17 | CAI | Caris Life Sciences, Inc. | Brille Brian J | Director, Officer | OPT+S | $30.33 | 400,000 | $12,132,080 | 230,303 |
| 2026-09-17 21:09 | 2026-09-16 | GH | Guardant Health, Inc. | Tariq Musa | Director | OPT+S | $175.00 | 116 | $20,300 | 11,449 |
| 2026-09-17 21:09 | 2026-09-16 | GH | Guardant Health, Inc. | Azar Alex M II | Director | SELL | $175.00 | 826 | $144,550 | 825 |
| 2026-09-17 21:10 | 2026-09-16 | GH | Guardant Health, Inc. | Krognes Steve E. | Director | SELL | $175.74 | 6,674 | $1,172,885 | 7,906 |
| 2026-09-17 21:11 | 2026-09-15 | GH | Guardant Health, Inc. | Chudova Darya | Officer | SELL | $178.00 | 7,738 | $1,377,364 | 70,635 |
| 2026-09-16 20:01 | 2026-09-14 | YDES | YD Bio Ltd | Shen Ethan PhD | Director, Officer | BUY | $3.85 | 12,700 | $48,895 | 11,258,331 |
| 2026-09-16 20:20 | 2026-09-14 | CSTL | CASTLE BIOSCIENCES INC | Juvenal Tobin W | Officer | SELL | $33.73 | 6,600 | $222,621 | 58,584 |
| 2026-09-17 01:35 | 2026-09-14 | NTRA | Natera, Inc. | Rabinowitz Matthew | Director, Officer | SELL | $341.15 | 102,000 | $34,797,269 | 0 |
| 2026-09-16 22:43 | 2026-09-14 | BLLN | BillionToOne, Inc. | Atay Oguzhan | Director, Officer | OPT+S | $99.91 | 30,331 | $3,030,443 | 157,168 |
| 2026-09-16 20:08 | 2026-09-14 | VCYT | VERACYTE, INC. | Holstein Jens | Director | SELL | $40.95 | 5,000 | $204,747 | 27,471 |
| 2026-09-15 20:08 | 2026-09-11 | CSTL | CASTLE BIOSCIENCES INC | MAETZOLD DEREK J | Director, Officer | OPT+S | $32.02 | 14,518 | $464,871 | 12,268 |
| 2026-09-14 22:11 | 2026-09-11 | GH | Guardant Health, Inc. | Kalia Kumud | Officer | SELL | $158.05 | 4,000 | $632,193 | 39,794 |
| 2026-09-11 20:07 | 2026-09-10 | SERA | SERA PROGNOSTICS, INC. | Inglis Tiffany Eul Davis | Officer | SELL | $2.00 | 486 | $972 | 91,589 |
| 2026-09-11 20:07 | 2026-09-10 | SERA | SERA PROGNOSTICS, INC. | Anderson Dyaarl Lee Jr. | Officer | SELL | $2.00 | 1,800 | $3,600 | 76,198 |
| 2026-09-11 20:07 | 2026-09-10 | SERA | SERA PROGNOSTICS, INC. | Lindgardt Zhenya | Director, Officer | SELL | $2.00 | 7,022 | $14,044 | 837,848 |
| 2026-09-11 20:07 | 2026-09-10 | SERA | SERA PROGNOSTICS, INC. | Jackson Benjamin | Officer | SELL | $2.00 | 2,190 | $4,380 | 159,566 |
| 2026-09-12 01:35 | 2026-09-11 | NTRA | Natera, Inc. | Rabinowitz Matthew | Director, Officer | SELL | $327.97 | 50,000 | $16,398,265 | 2,225,394 |
| 2026-09-11 22:01 | 2026-09-09 | BLLN | BillionToOne, Inc. | Tsao David | Director, Officer | OPT+S | $98.77 | 20,000 | $1,975,400 | 1,000 |
| 2026-09-11 22:01 | 2026-09-09 | BLLN | BillionToOne, Inc. | ten Bosch John Roderick | Officer | SELL | $97.54 | 1,416 | $138,117 | 25,051 |
| 2026-09-10 20:01 | 2026-09-09 | YDES | YD Bio Ltd | Shen Ethan PhD | Director, Officer | BUY | $3.93 | 3,100 | $12,183 | 11,245,631 |
| 2026-09-10 20:08 | 2026-09-09 | FTRE | Fortrea Holdings Inc. | Russell Carrie Elizabeth | Officer | OPT+S | $16.85 | 246 | $4,145 | 2,384 |
| 2026-09-10 20:05 | 2026-09-09 | FTRE | Fortrea Holdings Inc. | Morais Mark A. | Officer | OPT+S | $16.85 | 3,149 | $53,061 | 81,794 |
| 2026-09-10 23:44 | 2026-09-08 | BLLN | BillionToOne, Inc. | Lynch Thomas P. | Officer | OPT+S | $99.99 | 20,000 | $1,999,880 | 700 |
| 2026-09-09 20:07 | 2026-09-08 | SERA | SERA PROGNOSTICS, INC. | Lindgardt Zhenya | Director, Officer | SELL | $2.00 | 20,139 | $40,278 | 844,870 |
| 2026-09-08 20:00 | 2026-09-04 | YDES | YD Bio Ltd | Shen Ethan PhD | Director, Officer | BUY | $3.67 | 18,378 | $67,447 | 11,242,531 |
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.