Robert W Stallings
CIK 900764 · View on SEC EDGAR ↗
Insider
First SEC filing: April 23, 2026 · Latest: April 23, 2026
On this page
Insider at
Insider transactions
21 buys (P)
0 sells (S)
Net:
$4,610,418
+ 8 non-open-market transactions below
Avg return of open purchases vs now:
-8.8%
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
8 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| March 6, 2026 | TCBIO | P | 5,500 | $22.80 | $125,400 | 175,087 Direct | +3.24% | Acquired | -10.2% (price as of 2026-08-20) |
| March 5, 2026 | TCBIO | P | 20,000 | $22.69 | $453,800 | 169,587 Direct | +13.37% | Acquired | -9.7% (price as of 2026-08-20) |
| March 4, 2026 | TCBIO | P | 15,000 | $22.51 | $337,650 | 149,587 Direct | +11.15% | Acquired | -9.0% (price as of 2026-08-20) |
| March 3, 2026 | TCBIO | P | 30,000 | $22.11 | $663,300 | 134,587 Direct | +28.68% | Acquired | -7.4% (price as of 2026-08-20) |
| March 2, 2026 | TCBIO | P | 20,000 | $22.22 | $444,400 | 104,587 Direct | +23.64% | Acquired | -7.8% (price as of 2026-08-20) |
| Feb. 27, 2026 | TCBIO | P | 5,000 | $22.29 | $111,450 | 360,913 Indirect | +1.40% | Acquired | -8.1% (price as of 2026-08-20) |
| Feb. 27, 2026 | TCBIO | P | 3,330 | $94.86 | $315,884 | 293,291 Direct | +1.15% | Acquired | -78.4% (price as of 2026-08-20) |
| Feb. 24, 2026 | TCBIO | P | 20,000 | $22.26 | $445,200 | 355,913 Indirect | +5.95% | Acquired | -8.0% (price as of 2026-08-20) |
| Feb. 23, 2026 | TCBIO | P | 20,000 | $22.14 | $442,800 | 335,913 Indirect | +6.33% | Acquired | -7.5% (price as of 2026-08-20) |
| Feb. 18, 2026 | TCBIO | P | 2,000 | $22.20 | $44,400 | 315,913 Indirect | +0.64% | Acquired | -7.7% (price as of 2026-08-20) |
| Feb. 17, 2026 | TCBIO | P | 8,000 | $22.11 | $176,880 | 313,913 Indirect | +2.62% | Acquired | -7.4% (price as of 2026-08-20) |
| Feb. 5, 2026 | TCBIO | P | 8,385 | $21.36 | $179,104 | 305,913 Indirect | +2.82% | Acquired | -4.1% (price as of 2026-08-20) |
| Feb. 4, 2026 | TCBIO | P | 8,500 | $21.35 | $181,475 | 297,528 Indirect | +2.94% | Acquired | -4.1% (price as of 2026-08-20) |
| Feb. 3, 2026 | TCBIO | P | 3,600 | $21.10 | $75,960 | 289,028 Indirect | +1.26% | Acquired | -2.9% (price as of 2026-08-20) |
| Feb. 2, 2026 | TCBIO | P | 515 | $20.97 | $10,800 | 285,428 Indirect | +0.18% | Acquired | -2.3% (price as of 2026-08-20) |
| Jan. 30, 2026 | TCBIO | P | 4,500 | $20.91 | $94,095 | 284,913 Indirect | +1.60% | Acquired | -2.1% (price as of 2026-08-20) |
| Jan. 29, 2026 | TCBIO | P | 2,500 | $20.94 | $52,350 | 280,413 Indirect | +0.90% | Acquired | -2.2% (price as of 2026-08-20) |
| Jan. 23, 2026 | TCBIO | P | 2,000 | $20.91 | $41,820 | 277,913 Indirect | +0.72% | Acquired | -2.1% (price as of 2026-08-20) |
| Oct. 28, 2025 | TCBIO | P | 5,000 | $20.83 | $104,150 | 275,913 Indirect | +1.85% | Acquired | -1.7% (price as of 2026-08-20) |
| Oct. 27, 2025 | TCBIO | P | 5,000 | $20.68 | $103,400 | 270,913 Indirect | +1.88% | Acquired | -1.0% (price as of 2026-08-20) |
| Oct. 24, 2025 | TCBIO | P | 10,000 | $20.61 | $206,100 | 265,913 Indirect | +3.91% | Acquired | -0.6% (price as of 2026-08-20) |
| June 11, 2025 | TCBIO | P | 10,500 | $20.28 | $212,940 | 60,000 Indirect | +21.21% | Acquired | 1.0% (price as of 2026-08-20) |
| June 2, 2025 | TCBIO | P | 7,000 | $19.78 | $138,460 | 255,913 Indirect | +2.81% | Acquired | 3.5% (price as of 2026-08-20) |
| May 22, 2025 | TCBIO | P | 1,000 | $19.93 | $19,930 | 248,913 Indirect | +0.40% | Acquired | 2.8% (price as of 2026-08-20) |
| May 21, 2025 | TCBIO | P | 8,000 | $19.79 | $158,320 | 247,913 Indirect | +3.33% | Acquired | 3.5% (price as of 2026-08-20) |
| May 19, 2025 | TCBIO | P | 1,000 | $19.95 | $19,950 | 239,913 Indirect | +0.42% | Acquired | 2.7% (price as of 2026-08-20) |
| May 16, 2025 | TCBIO | P | 3,500 | $19.91 | $69,685 | 238,913 Indirect | +1.49% | Acquired | 2.9% (price as of 2026-08-20) |
| May 12, 2025 | TCBIO | P | 4,200 | $20.05 | $84,210 | 235,413 Indirect | +1.82% | Acquired | 2.1% (price as of 2026-08-20) |
| May 7, 2025 | TCBIO | P | 300 | $20.00 | $6,000 | 231,213 Indirect | +0.13% | Acquired | 2.4% (price as of 2026-08-20) |
| May 1, 2025 | TCBIO | P | 1,000 | $19.85 | $19,850 | 230,913 Indirect | +0.43% | Acquired | 3.2% (price as of 2026-08-20) |
| April 29, 2025 | TCBIO | P | 1,000 | $19.84 | $19,840 | 229,913 Indirect | +0.44% | Acquired | 3.2% (price as of 2026-08-20) |
| April 25, 2025 | TCBIO | P | 5,000 | $67.76 | $338,800 | 90,039 Indirect | +5.88% | Acquired | -69.8% (price as of 2026-08-20) |
| April 23, 2025 | TCBIO | P | 1,000 | $19.80 | $19,800 | 228,913 Indirect | +0.44% | Acquired | 3.4% (price as of 2026-08-20) |
| April 23, 2025 | TCBIO | P | 500 | $68.20 | $34,100 | 289,961 Direct | +0.17% | Acquired | -70.0% (price as of 2026-08-20) |
| April 21, 2025 | TCBIO | P | 9,500 | $19.17 | $182,115 | 227,913 Indirect | +4.35% | Acquired | 6.8% (price as of 2026-08-20) |
| April 21, 2025 | TCBIO | P | 4,500 | $64.27 | $289,215 | 288,131 Direct | +1.59% | Acquired | -68.1% (price as of 2026-08-20) |
| March 13, 2025 | TCBIO | P | 1,000 | $20.40 | $20,400 | 218,413 Indirect | +0.46% | Acquired | 0.4% (price as of 2026-08-20) |
| March 12, 2025 | TCBIO | P | 2,000 | $19.90 | $39,800 | 217,413 Indirect | +0.93% | Acquired | 2.9% (price as of 2026-08-20) |
| March 4, 2025 | TCBIO | P | 7,000 | $20.43 | $143,010 | 49,500 Indirect | +16.47% | Acquired | 0.2% (price as of 2026-08-20) |
| Feb. 21, 2025 | TCBIO | P | 2,500 | $21.26 | $53,150 | 42,500 Indirect | +6.25% | Acquired | -3.7% (price as of 2026-08-20) |
| Feb. 6, 2025 | TCBIO | P | 7,000 | $21.32 | $149,240 | 215,413 Indirect | +3.36% | Acquired | -3.9% (price as of 2026-08-20) |
| Feb. 5, 2025 | TCBIO | P | 6,000 | $21.31 | $127,860 | 208,413 Indirect | +2.96% | Acquired | -3.9% (price as of 2026-08-20) |
| Feb. 4, 2025 | TCBIO | P | 7,000 | $21.10 | $147,700 | 202,413 Indirect | +3.58% | Acquired | -2.9% (price as of 2026-08-20) |
| Feb. 3, 2025 | TCBIO | P | 5,000 | $21.17 | $105,850 | 195,413 Indirect | +2.63% | Acquired | -3.3% (price as of 2026-08-20) |
| Jan. 31, 2025 | TCBIO | P | 6,788 | $21.30 | $144,584 | 190,413 Indirect | +3.70% | Acquired | -3.8% (price as of 2026-08-20) |
| Jan. 29, 2025 | TCBIO | P | 726 | $20.99 | $15,239 | 183,625 Indirect | +0.40% | Acquired | -2.4% (price as of 2026-08-20) |
| Jan. 27, 2025 | TCBIO | P | 2,006 | $20.99 | $42,106 | 182,899 Indirect | +1.11% | Acquired | -2.4% (price as of 2026-08-20) |
| Jan. 24, 2025 | TCBIO | P | 5,000 | $20.92 | $104,600 | 180,893 Indirect | +2.84% | Acquired | -2.1% (price as of 2026-08-20) |
| Jan. 24, 2025 | TCBIO | P | 670 | $77.45 | $51,892 | 85,039 Indirect | +0.79% | Acquired | -73.6% (price as of 2026-08-20) |
| Oct. 22, 2024 | TCBIO | P | 20,000 | $21.28 | $425,600 | 84,587 Direct | +30.97% | Acquired | -3.8% (price as of 2026-08-20) |
| Sept. 10, 2024 | TCBIO | P | 1,187 | $20.79 | $24,678 | 175,893 Indirect | +0.68% | Acquired | -1.5% (price as of 2026-08-20) |
| Sept. 10, 2024 | TCBIO | P | 480 | $20.86 | $10,013 | 64,587 Direct | +0.75% | Acquired | -1.8% (price as of 2026-08-20) |
| Aug. 23, 2024 | TCBIO | P | 5,245 | $20.17 | $105,792 | 64,107 Direct | +8.91% | Acquired | 1.5% (price as of 2026-08-20) |
| Aug. 23, 2024 | TCBIO | P | 10,000 | $20.20 | $202,000 | 40,000 Indirect | +33.33% | Acquired | 1.4% (price as of 2026-08-20) |
| Aug. 22, 2024 | TCBIO | P | 3,568 | $20.08 | $71,645 | 58,862 Direct | +6.45% | Acquired | 2.0% (price as of 2026-08-20) |
| Aug. 22, 2024 | TCBIO | P | 10,000 | $20.13 | $201,300 | 30,000 Indirect | +50.00% | Acquired | 1.7% (price as of 2026-08-20) |
| Aug. 2, 2024 | TCBIO | P | 15,000 | $20.00 | $300,000 | 20,000 Indirect | +300.00% | Acquired | 2.4% (price as of 2026-08-20) |
| July 31, 2024 | TCBIO | P | 14,000 | $19.93 | $279,020 | 55,294 Direct | +33.90% | Acquired | 2.8% (price as of 2026-08-20) |
| July 30, 2024 | TCBIO | P | 10,000 | $20.47 | $204,700 | 41,294 Direct | +31.96% | Acquired | 0.0% (price as of 2026-08-20) |
| July 29, 2024 | TCBIO | P | 10,000 | $20.46 | $204,600 | 31,294 Direct | +46.96% | Acquired | 0.1% (price as of 2026-08-20) |
| July 26, 2024 | TCBIO | P | 8,500 | $20.51 | $174,335 | 21,294 Direct | +66.44% | Acquired | -0.1% (price as of 2026-08-20) |
| July 25, 2024 | TCBIO | P | 4,000 | $20.62 | $82,480 | 12,794 Direct | +45.49% | Acquired | -0.7% (price as of 2026-08-20) |
| July 24, 2024 | TCBIO | P | 5,000 | $20.53 | $102,650 | 8,794 Direct | +131.79% | Acquired | -0.2% (price as of 2026-08-20) |
| July 23, 2024 | TCBIO | P | 500 | $20.60 | $10,300 | 3,794 Direct | +15.18% | Acquired | -0.6% (price as of 2026-08-20) |
| May 23, 2024 | TCBIO | P | 5,369 | $58.72 | $315,268 | 84,369 Indirect | +6.80% | Acquired | -65.1% (price as of 2026-08-20) |
| May 23, 2024 | TCBIO | P | 5,000 | $19.02 | $95,100 | 174,706 Indirect | +2.95% | Acquired | 7.7% (price as of 2026-08-20) |
| May 22, 2024 | TCBIO | P | 3,000 | $19.36 | $58,080 | 169,706 Indirect | +1.80% | Acquired | 5.8% (price as of 2026-08-20) |
| May 21, 2024 | TCBIO | P | 3,000 | $19.48 | $58,440 | 166,706 Indirect | +1.83% | Acquired | 5.1% (price as of 2026-08-20) |
| May 20, 2024 | TCBIO | P | 6,000 | $19.52 | $117,120 | 163,706 Indirect | +3.80% | Acquired | 4.9% (price as of 2026-08-20) |
| May 17, 2024 | TCBIO | P | 996 | $19.53 | $19,452 | 157,706 Indirect | +0.64% | Acquired | 4.9% (price as of 2026-08-20) |
| May 16, 2024 | TCBIO | P | 4 | $19.40 | $78 | 156,710 Indirect | 0.00% | Acquired | 5.6% (price as of 2026-08-20) |
| May 10, 2024 | TCBIO | P | 3,000 | $19.50 | $58,500 | 156,706 Indirect | +1.95% | Acquired | 5.0% (price as of 2026-08-20) |
| May 7, 2024 | TCBIO | P | 3,000 | $19.70 | $59,100 | 153,706 Indirect | +1.99% | Acquired | 4.0% (price as of 2026-08-20) |
| Feb. 13, 2024 | TCBIO | P | 4,000 | $56.48 | $225,920 | 79,000 Indirect | +5.33% | Acquired | -63.7% (price as of 2026-08-20) |
| Feb. 7, 2024 | TCBIO | P | 4,000 | $18.77 | $75,080 | 150,706 Indirect | +2.73% | Acquired | 9.1% (price as of 2026-08-20) |
| Feb. 5, 2024 | TCBIO | P | 6,000 | $18.64 | $111,840 | 146,706 Indirect | +4.26% | Acquired | 9.9% (price as of 2026-08-20) |
| Feb. 2, 2024 | TCBIO | P | 5,000 | $18.81 | $94,050 | 140,706 Indirect | +3.68% | Acquired | 8.9% (price as of 2026-08-20) |
| Feb. 1, 2024 | TCBIO | P | 1,000 | $58.80 | $58,800 | 75,000 Indirect | +1.35% | Acquired | -65.2% (price as of 2026-08-20) |
| Feb. 1, 2024 | TCBIO | P | 4,000 | $19.02 | $76,080 | 135,706 Indirect | +3.04% | Acquired | 7.7% (price as of 2026-08-20) |
| Jan. 31, 2024 | TCBIO | P | 4,000 | $19.93 | $79,720 | 131,706 Indirect | +3.13% | Acquired | 2.8% (price as of 2026-08-20) |
| Jan. 29, 2024 | TCBIO | P | 1,000 | $19.48 | $19,480 | 127,706 Indirect | +0.79% | Acquired | 5.1% (price as of 2026-08-20) |
| Jan. 26, 2024 | TCBIO | P | 9,000 | $19.49 | $175,410 | 126,706 Indirect | +7.65% | Acquired | 5.1% (price as of 2026-08-20) |
| Jan. 25, 2024 | TCBIO | P | 5,000 | $19.09 | $95,450 | 117,706 Indirect | +4.44% | Acquired | 7.3% (price as of 2026-08-20) |
| Jan. 24, 2024 | TCBIO | P | 4,000 | $18.98 | $75,920 | 112,706 Indirect | +3.68% | Acquired | 7.9% (price as of 2026-08-20) |
| Jan. 23, 2024 | TCBIO | P | 7,000 | $18.93 | $132,510 | 108,706 Indirect | +6.88% | Acquired | 8.2% (price as of 2026-08-20) |
| Jan. 22, 2024 | TCBIO | P | 5,000 | $18.95 | $94,750 | 101,706 Indirect | +5.17% | Acquired | 8.1% (price as of 2026-08-20) |
| Dec. 7, 2023 | TCBIO | P | 5,772 | $18.54 | $107,013 | 96,706 Indirect | +6.35% | Acquired | 10.5% (price as of 2026-08-20) |
| Dec. 6, 2023 | TCBIO | P | 4,934 | $18.58 | $91,674 | 90,934 Indirect | +5.74% | Acquired | 10.2% (price as of 2026-08-20) |
| Dec. 5, 2023 | TCBIO | P | 1,000 | $18.64 | $18,640 | 86,000 Indirect | +1.18% | Acquired | 9.9% (price as of 2026-08-20) |
| Nov. 22, 2023 | TCBIO | P | 3,294 | $17.90 | $58,963 | 3,294 Direct | — | Acquired | 14.4% (price as of 2026-08-20) |
| Nov. 22, 2023 | TCBIO | P | 1,000 | $53.85 | $53,850 | 282,000 Direct | +0.36% | Acquired | -62.0% (price as of 2026-08-20) |
| Nov. 20, 2023 | TCBIO | S | 7,000 | $54.14 | $378,980 | 281,000 Direct | -2.43% | Disposed | -62.2% (price as of 2026-08-20) |
Showing latest 100 of 256 transactions
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| April 22, 2026 | TCBIO | 2025 Restricted Stock Units | Common Stock (1,670) | $0.00 | — | 1,670 | Disposed |
| April 23, 2025 | TCBIO | 2024 Restricted Stock Units | Common Stock (1,330) | $0.00 | — | 1,330 | Disposed |
| April 22, 2025 | TCBIO | 2025 Restricted Stock Units | Common Stock (1,670) | $0.00 | — | 1,670 | Acquired |
| April 23, 2024 | TCBIO | 2024 Restricted Stock Units | Common Stock (1,330) | $0.00 | — | 1,330 | Acquired |
| April 18, 2024 | TCBIO | Restricted Stock Units | Common Stock (1,631) | $0.00 | — | 1,631 | Disposed |
| April 19, 2023 | TCBIO | Restricted Stock Units | Common Stock (1,377) | $0.00 | — | 1,377 | Disposed |
| April 18, 2023 | TCBIO | Restricted Stock Units | Common Stock (1,631) | $0.00 | — | 1,631 | Acquired |
| Oct. 31, 2019 | TCBIO | Stock Appreciation Rights | Common Stock (600) | $18.52 | May 18, 2020 | 600 | Disposed |
| Oct. 29, 2014 | TCBIO | Stock Appreciation Right | Common Stock (2,400) | $18.52 | May 18, 2020 | 2,400 | Disposed |
| Oct. 29, 2014 | TCBIO | Stock Appreciation Right | Common Stock (3,000) | $14.17 | May 19, 2019 | 3,000 | Disposed |
| May 18, 2010 | TCBIO | Stock Appreciation Rights [F7] | Common Stock (3,000) | $18.52 | May 18, 2020 | 3,000 | Acquired |
| May 19, 2009 | TCBIO | Stock Appreciation Rights | Common Stock (3,000) | $14.17 | May 19, 2019 | 3,000 | Acquired |
| May 19, 2008 | TCBIO | Stock Appreciation Rights | Common Stock (3,000) | $18.67 | May 19, 2018 | 3,000 | Acquired |
| May 19, 2008 | TCBIO | Stock Appreciation Rights | Common Stock (2,000) | $18.67 | May 19, 2018 | 2,000 | Acquired |
| July 24, 2007 | TCBIO | Stock Appreciation Rights | Common Stock (2,000) | $22.47 | July 24, 2017 | 2,000 | Acquired |
| May 16, 2006 | TCBIO | Restricted Stock Units | Common Stock (100) | — | — | 100 | Disposed |
| May 16, 2006 | TCBIO | Stock Appreciation Rights | Common Stock (2,000) | $23.00 | May 16, 2016 | 2,000 | Acquired |
| May 16, 2006 | TCBIO | Restricted Stock Units | Common Stock (500) | — | — | 500 | Acquired |
| May 17, 2005 | TCBIO | Common Stock Options | Common Stock (4,000) | $19.37 | May 17, 2015 | 4,000 | Acquired |
| May 18, 2004 | TCBIO | Common Stock Options | Common Stock (4,000) | $14.91 | May 18, 2014 | 4,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).