Paul Stuka
Insider
First SEC filing: Aug. 30, 2011 · Latest: Aug. 30, 2011
Insider at
Insider transactions
14 buys (P)
0 sells (S)
Net: $284,057
Avg return of open purchases vs now: -59.4%
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Sept. 18, 2026 | NSPR | J | 43,750 | · | · | 43,750 Indirect | -50.00% | Disposed | (price as of 2026-10-06) |
| Sept. 18, 2026 | NSPR | J | 43,750 | · | · | 43,750 Indirect | · | Acquired | (price as of 2026-10-06) |
| Sept. 18, 2026 | NSPR | J | 87,500 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-06) |
| Sept. 18, 2026 | NSPR | J | 87,500 | · | · | 43,750 Indirect | · | Acquired | (price as of 2026-10-06) |
| May 27, 2026 | NSPR | P | 20,000 | $0.88 | $17,600 | 667,871 Direct | +3.09% | Acquired | -40.3% (price as of 2026-10-06) |
| May 14, 2026 | NSPR | P | 5,000 | $1.15 | $5,750 | 647,871 Direct | +0.78% | Acquired | -54.3% (price as of 2026-10-06) |
| May 13, 2026 | NSPR | P | 10,000 | $1.16 | $11,600 | 642,871 Direct | +1.58% | Acquired | -54.7% (price as of 2026-10-06) |
| May 11, 2026 | NSPR | P | 10,000 | $1.19 | $11,900 | 632,871 Direct | +1.61% | Acquired | -55.9% (price as of 2026-10-06) |
| May 11, 2026 | NSPR | P 10b5-1 | 10,000 | $1.19 | $11,900 | 632,871 Direct | +1.61% | Acquired | -55.9% (price as of 2026-10-06) |
| May 8, 2026 | NSPR | P | 65,626 | $1.16 | $76,126 | 622,871 Direct | +11.78% | Acquired | -54.7% (price as of 2026-10-06) |
| May 8, 2026 | NSPR | P 10b5-1 | 65,626 | $1.16 | $76,126 | 622,871 Direct | +11.78% | Acquired | -54.7% (price as of 2026-10-06) |
| May 7, 2026 | NSPR | P | 6,378 | $1.15 | $7,335 | 531,599 Direct | +1.21% | Acquired | -54.3% (price as of 2026-10-06) |
| May 6, 2026 | NSPR | P | 1,517 | $1.12 | $1,699 | 525,221 Direct | +0.29% | Acquired | -53.1% (price as of 2026-10-06) |
| Jan. 14, 2026 | NSPR | A | 132,076 | · | · | 523,704 Direct | +33.72% | Acquired | (price as of 2026-10-06) |
| Dec. 9, 2025 | NSPR | P | 2,710 | $1.81 | $4,905 | 391,628 Direct | +0.70% | Acquired | -71.0% (price as of 2026-10-06) |
| Dec. 9, 2025 | NSPR | P | 5,073 | $1.81 | $9,182 | 391,628 Direct | +1.31% | Acquired | -71.0% (price as of 2026-10-06) |
| Dec. 5, 2025 | NSPR | P | 5,073 | $1.86 | $9,436 | 388,918 Direct | +1.32% | Acquired | -71.8% (price as of 2026-10-06) |
| Dec. 4, 2025 | NSPR | P | 10,130 | $1.85 | $18,740 | 383,845 Direct | +2.71% | Acquired | -71.6% (price as of 2026-10-06) |
| Nov. 12, 2025 | NSPR | P | 13,431 | $1.62 | $21,758 | 373,715 Direct | +3.73% | Acquired | -67.6% (price as of 2026-10-06) |
| July 30, 2025 | NSPR | P | 20,661 | $2.42 | $50,000 | 444,195 Indirect | +4.88% | Acquired | -78.3% (price as of 2026-10-06) |
| July 1, 2025 | NSPR | X | 87,500 | $1.38 | $120,750 | 423,534 Indirect | +26.04% | Acquired | -61.9% (price as of 2026-10-06) |
| July 1, 2025 | NSPR | X | 87,500 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-06) |
| Jan. 7, 2025 | NSPR | A | 48,736 | · | · | 360,284 Direct | +15.64% | Acquired | (price as of 2026-10-06) |
| Jan. 7, 2025 | NSPR | A | 22,254 | · | · | 128,129 Direct | +21.02% | Acquired | (price as of 2026-10-06) |
| June 5, 2024 | NSPR | X | 87,500 | $1.38 | $120,750 | 336,034 Indirect | +35.21% | Acquired | -61.9% (price as of 2026-10-06) |
| June 5, 2024 | NSPR | X | 87,500 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-06) |
| Jan. 23, 2024 | NSPR | A | 43,548 | · | · | 311,548 Direct | +16.25% | Acquired | (price as of 2026-10-06) |
| Jan. 23, 2024 | NSPR | A | 16,647 | · | · | 105,875 Direct | +18.66% | Acquired | (price as of 2026-10-06) |
| May 17, 2023 | NSPR | A | 225,680 | · | · | 268,000 Direct | +533.27% | Acquired | (price as of 2026-10-06) |
| May 17, 2023 | NSPR | A | 75,220 | · | · | 89,228 Direct | +536.98% | Acquired | (price as of 2026-10-06) |
| May 12, 2023 | NSPR | P | 175,000 | $1.63 | $285,250 | 248,534 Indirect | +237.99% | Acquired | -67.8% (price as of 2026-10-06) |
| May 12, 2023 | NSPR | P | 87,500 | $1.63 | $142,625 | 87,500 Indirect | · | Acquired | -67.8% (price as of 2026-10-06) |
| May 12, 2023 | NSPR | P | 87,500 | $1.63 | $142,625 | 87,500 Indirect | · | Acquired | -67.8% (price as of 2026-10-06) |
| May 12, 2023 | NSPR | P | 87,500 | $1.63 | $142,625 | 87,500 Indirect | · | Acquired | -67.8% (price as of 2026-10-06) |
| May 12, 2023 | NSPR | P | 87,500 | $1.63 | $142,625 | 87,500 Indirect | · | Acquired | -67.8% (price as of 2026-10-06) |
| Dec. 1, 2021 | NSPR | P | 12,037 | $3.51 | $42,250 | 73,534 Indirect | +19.57% | Acquired | -85.0% (price as of 2026-10-06) |
| Nov. 30, 2021 | NSPR | P | 18,372 | $3.55 | $65,221 | 61,497 Indirect | +42.60% | Acquired | -85.2% (price as of 2026-10-06) |
| Nov. 29, 2021 | NSPR | P | 3,177 | $3.55 | $11,278 | 43,125 Indirect | +7.95% | Acquired | -85.2% (price as of 2026-10-06) |
| Nov. 26, 2021 | NSPR | P | 1,200 | $3.55 | $4,260 | 39,948 Indirect | +3.10% | Acquired | -85.2% (price as of 2026-10-06) |
| Nov. 24, 2021 | NSPR | P | 18,328 | $3.55 | $65,064 | 38,748 Indirect | +89.76% | Acquired | -85.2% (price as of 2026-10-06) |
| Nov. 23, 2021 | NSPR | P | 1,204 | $3.55 | $4,274 | 20,420 Indirect | +6.27% | Acquired | -85.2% (price as of 2026-10-06) |
| Nov. 22, 2021 | NSPR | P | 19,188 | $3.54 | $67,926 | 19,216 Indirect | +68528.57% | Acquired | -85.2% (price as of 2026-10-06) |
| Oct. 13, 2021 | NSPR | A | 26,079 | · | · | 42,320 Direct | +160.58% | Acquired | (price as of 2026-10-06) |
| Oct. 13, 2021 | NSPR | A | 8,693 | · | · | 8,693 Direct | · | Acquired | (price as of 2026-10-06) |
| Aug. 31, 2020 | NSPR | A | 238,950 | · | · | 243,606 Direct | +5132.09% | Acquired | (price as of 2026-10-06) |
| Aug. 31, 2020 | NSPR | A | 79,650 | · | · | 79,678 Direct | +284464.29% | Acquired | (price as of 2026-10-06) |
| Feb. 4, 2019 | NSPR | A | 195,000 | · | · | 219,999 Direct | +780.03% | Acquired | (price as of 2026-10-06) |
| Dec. 11, 2018 | NSPR | S | 65 | $0.18 | $12 | 12,746 Indirect | -0.51% | Disposed | -99.6% (price as of 2026-10-06) |
| Dec. 7, 2016 | NSPR | A | 12,500 | · | · | 12,500 Direct | · | Acquired | (price as of 2026-10-06) |
| July 7, 2016 | NSPR | P | 3,030 | $33.00 | $99,990 | 3,030 Direct | · | Acquired | -100.0% (price as of 2026-10-06) |
| July 7, 2016 | NSPR | P | 303,000 | $33.00 | $9,999,000 | 303,000 Direct | · | Acquired | -100.0% (price as of 2026-10-06) |
| July 7, 2016 | NSPR | P | 1,515 | $33.00 | $49,995 | 1,515 Indirect | · | Acquired | -100.0% (price as of 2026-10-06) |
| July 7, 2016 | NSPR | P | 151,500 | $33.00 | $4,999,500 | 151,500 Indirect | · | Acquired | -100.0% (price as of 2026-10-06) |
| June 30, 2016 | NSPR | A | 136,257 | · | · | 136,257 Direct | · | Acquired | (price as of 2026-10-06) |
| March 21, 2016 | NSPR | P | 127,119 | $0.59 | $75,000 | 267,060 Indirect | +90.84% | Acquired | -100.0% (price as of 2026-10-06) |
| March 21, 2016 | NSPR | P | 63,560 | $0.59 | $37,500 | 63,560 Indirect | · | Acquired | -100.0% (price as of 2026-10-06) |
| Jan. 26, 2016 | NSPR | A | 1 | · | · | 1 Direct | · | Acquired | (price as of 2026-10-06) |
| Jan. 26, 2016 | NSPR | D | 2,500 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| Jan. 26, 2016 | NSPR | D | 1,250 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| Jan. 26, 2016 | NSPR | D | 5,000 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| Jan. 26, 2016 | NSPR | D | 7,500 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| Jan. 26, 2016 | NSPR | D | 4,637 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| Jan. 26, 2016 | NSPR | D | 5,409 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| Sept. 30, 2015 | NSPR | A | 90,869 | · | · | 90,869 Direct | · | Acquired | (price as of 2026-10-06) |
| June 30, 2015 | NSPR | A | 55,338 | · | · | 55,338 Direct | · | Acquired | (price as of 2026-10-06) |
| March 31, 2015 | NSPR | A | 48,905 | · | · | 48,905 Direct | · | Acquired | (price as of 2026-10-06) |
| March 9, 2015 | NSPR | P | 625,000 | · | · | 625,000 Indirect | · | Acquired | (price as of 2026-10-06) |
| March 9, 2015 | NSPR | P | 625,000 | · | · | 1,370,204 Indirect | +83.87% | Acquired | (price as of 2026-10-06) |
| Jan. 26, 2015 | NSPR | A | 54,088 | · | · | 54,088 Direct | · | Acquired | (price as of 2026-10-06) |
| Jan. 5, 2015 | NSPR | J | 46,367 | · | · | 46,367 Direct | · | Acquired | (price as of 2026-10-06) |
| May 8, 2014 | NSPR | J | 926 | · | · | 139,941 Indirect | +0.67% | Acquired | (price as of 2026-10-06) |
| Jan. 29, 2014 | NSPR | A | 50,000 | · | · | 50,000 Direct | · | Acquired | (price as of 2026-10-06) |
| Dec. 20, 2013 | NSPR | J | 326 | · | · | 139,015 Indirect | +0.24% | Acquired | (price as of 2026-10-06) |
| May 9, 2013 | NSPR | J | 3,795 | · | · | 745,204 Indirect | +0.51% | Acquired | (price as of 2026-10-06) |
| May 9, 2013 | NSPR | A | 75,000 | · | · | 75,000 Direct | · | Acquired | (price as of 2026-10-06) |
| April 16, 2013 | NSPR | J | 141,408 | · | · | 741,409 Indirect | +23.57% | Acquired | (price as of 2026-10-06) |
| April 16, 2013 | NSPR | P | 250,000 | $2.00 | $500,000 | 600,001 Indirect | +71.43% | Acquired | -100.0% (price as of 2026-10-06) |
| Jan. 9, 2013 | NSPR | J | 1,667 | · | · | 138,689 Indirect | +1.22% | Acquired | (price as of 2026-10-06) |
| Jan. 9, 2013 | NSPR | J | 16,667 | · | · | 350,001 Indirect | +5.00% | Acquired | (price as of 2026-10-06) |
| June 18, 2012 | NSPR | A | 12,500 | · | · | 12,500 Direct | · | Acquired | (price as of 2026-10-06) |
| June 18, 2012 | NSPR | A | 50,000 | · | · | 50,000 Direct | · | Acquired | (price as of 2026-10-06) |
| Aug. 8, 2011 | NSPR | A | 25,000 | · | · | 25,000 Direct | · | Acquired | (price as of 2026-10-06) |
| Aug. 8, 2011 | NSPR | A | 100,000 | · | · | 100,000 Direct | · | Acquired | (price as of 2026-10-06) |
| April 15, 2011 | NSPR | P | 83,333 | · | · | 83,333 Indirect | · | Acquired | (price as of 2026-10-06) |
| March 31, 2011 | NSPR | P | 83,333 | · | · | 83,333 Indirect | · | Acquired | (price as of 2026-10-06) |
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 |
|---|---|---|---|---|---|---|---|
| Sept. 18, 2026 | NSPR | Series J Warrant (right to buy) | Common Stock | $1.38 | · | 43,750 | Disposed |
| Sept. 18, 2026 | NSPR | Series J Warrant (right to buy) | Common Stock | $0.77 | · | 43,750 | Acquired |
| Sept. 18, 2026 | NSPR | Series K Warrant (right to buy) | Common Stock | $1.38 | · | 87,500 | Disposed |
| Sept. 18, 2026 | NSPR | Series K Warrant (right to buy) | Common Stock | $0.77 | · | 87,500 | Acquired |
| July 1, 2025 | NSPR | Series I Warrant (right to buy) | Common Stock | $1.38 | July 23, 2025 | 87,500 | Disposed |
| Jan. 7, 2025 | NSPR | Options to purchase common stock (right to buy) | Common Stock | $2.71 | Jan. 7, 2035 | 22,254 | Acquired |
| June 5, 2024 | NSPR | Series H Warrant (right to buy) | Common Stock | $1.38 | June 26, 2024 | 87,500 | Disposed |
| Jan. 23, 2024 | NSPR | Options to purchase common stock (right to buy) | Common Stock | $3.14 | Jan. 23, 2034 | 16,647 | Acquired |
| May 17, 2023 | NSPR | Options to purchase common stock (right to buy) | Common Stock | $1.76 | May 17, 2033 | 75,220 | Acquired |
| May 12, 2023 | NSPR | Series H Warrants to purchase Common Stock | Common Stock | $1.38 | · | 87,500 | Acquired |
| May 12, 2023 | NSPR | Series I Warrants to purchase Common Stock | Common Stock | $1.38 | · | 87,500 | Acquired |
| May 12, 2023 | NSPR | Series J Warrants to purchase Common Stock | Common Stock | $1.38 | · | 87,500 | Acquired |
| May 12, 2023 | NSPR | Series K Warrants to purchase Common Stock | Common Stock | $1.38 | · | 87,500 | Acquired |
| Oct. 13, 2021 | NSPR | Options to purchase common stock (right to buy) | Common Stock | $4.12 | Oct. 13, 2031 | 8,693 | Acquired |
| Aug. 31, 2020 | NSPR | Options to purchase common stock (right to buy) | Common Stock | $0.39 | Aug. 31, 2030 | 79,650 | Acquired |
| Dec. 7, 2016 | NSPR | Options (right to buy) | Common Stock | $3.04 | Dec. 7, 2026 | 12,500 | Acquired |
| July 7, 2016 | NSPR | Series B Convertible Preferred Stock | Common Stock | $0.33 | July 7, 2021 | 3,030 | Acquired |
| July 7, 2016 | NSPR | Warrants to Purchase Common Stock | Common Stock | $0.20 | July 7, 2021 | 303,000 | Acquired |
| July 7, 2016 | NSPR | Series B Convertible Preferred Stock | Common Stock | $0.33 | July 7, 2021 | 1,515 | Acquired |
| July 7, 2016 | NSPR | Warrants to Purchase Common Stock | Common Stock | $0.20 | July 7, 2021 | 151,500 | Acquired |
| June 30, 2016 | NSPR | Options (right to buy) | Common Stock | $0.33 | June 30, 2026 | 136,257 | Acquired |
| March 21, 2016 | NSPR | Warrants to Purchase Common Stock | Common Stock | $0.59 | March 21, 2021 | 63,560 | Acquired |
| Jan. 26, 2016 | NSPR | Options (right to buy) | Common Stock | · | Aug. 8, 2021 | 2,500 | Disposed |
| Jan. 26, 2016 | NSPR | Options (right to buy) | Common Stock | · | June 18, 2022 | 1,250 | Disposed |
| Jan. 26, 2016 | NSPR | Options (right to buy) | Common Stock | · | Jan. 29, 2024 | 5,000 | Disposed |
| Jan. 26, 2016 | NSPR | Options (right to buy) | Common Stock | · | May 9, 2023 | 7,500 | Disposed |
| Jan. 26, 2016 | NSPR | Options (right to buy) | Common Stock | · | Jan. 5, 2025 | 4,637 | Disposed |
| Jan. 26, 2016 | NSPR | Options (right to buy) | Common Stock | · | Jan. 26, 2025 | 5,409 | Disposed |
| Sept. 30, 2015 | NSPR | Options (right to buy) | Common Stock | $0.17 | Sept. 30, 2025 | 90,869 | Acquired |
| June 30, 2015 | NSPR | Option (right to buy) | Common Stock | $0.28 | June 30, 2025 | 55,338 | Acquired |
| March 31, 2015 | NSPR | Option (right to buy) | Common Stock | $0.32 | March 31, 2025 | 48,905 | Acquired |
| March 9, 2015 | NSPR | Warrants (right to buy) | Common Stock | $0.55 | March 9, 2020 | 625,000 | Acquired |
| Jan. 26, 2015 | NSPR | Stock Options (right to buy) | Common Stock | $0.72 | Jan. 26, 2025 | 54,088 | Acquired |
| Jan. 5, 2015 | NSPR | Options to Purchase Common Stock | Common Stock | $0.78 | Jan. 5, 2025 | 46,367 | Acquired |
| Jan. 29, 2014 | NSPR | Options to Purchase Common Stock | Common Stock | $3.10 | Jan. 29, 2024 | 50,000 | Acquired |
| May 9, 2013 | NSPR | Options to Purchase Common Stock | Common Stock | $2.75 | May 9, 2023 | 75,000 | Acquired |
| June 18, 2012 | NSPR | Options to Purchase Common Stock [F3] | Common Stock | $3.16 | June 18, 2022 | 12,500 | Acquired |
| June 18, 2012 | NSPR | Options to Purchase Common Stock | Common Stock | $0.79 | June 18, 2022 | 50,000 | Acquired |
| Aug. 8, 2011 | NSPR | Options to Purchase Common Stock [F3] | Common Stock | $7.80 | Aug. 8, 2021 | 25,000 | Acquired |
| Aug. 8, 2011 | NSPR | Options to Purchase Common Stock | Common stock | $1.95 | Aug. 8, 2021 | 100,000 | Acquired |
| April 15, 2011 | NSPR | Warrants [F3] | Common Stock | $7.20 | April 15, 2016 | 83,333 | Acquired |
| March 31, 2011 | NSPR | Warrants [F3] | Common Stock | $7.20 | March 31, 2016 | 83,333 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 2 holdings
Securities held when first becoming an insider, per SEC Form 3.