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BK

Bong Y. Koh

ALT
10% OWNER · ALTIMMUNE, INC. · CIK 0001615979
FILING MIX · LIFETIME87%/13%
BUYS
46
SELLS
7
TOTAL VALUE
$57.29M
COMPANIES
4
ACTIVE SINCE
May 2020
HOLDINGS NOW
30,878,251
AVG SELL PX
$13.63
TRADE KIND
SHOWING 53 / 53
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
51 backtested trades · 8 horizons · 29 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Bong Y. Koh, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d51+62.75%+4.29%+0.88%+3.41%+3.18%2.94
14d51+54.90%+2.44%+1.37%+1.07%+4.25%0.40
30d51+72.55%+15.85%+1.77%+14.08%+8.76%2.61
60d51+49.02%+28.97%+1.91%+25.06%-0.79%2.36
90d51+36.96%+18.68%+5.50%+14.05%-12.41%1.71
180d51(5 pending)+69.57%+12.00%+12.72%-0.72%-4.55%-0.20
1y51(5 pending)+47.83%+23.78%+24.59%-0.81%-52.30%-0.07
2y51(19 pending)+75.00%+4.49%+44.02%-39.53%-29.14%-7.78
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
ALT · 1,000,000 shares · as of Feb 25, 2021
01,125,0002,250,0003,375,0004,500,0002021SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
FLOW · 46 buys / 7 sellsCOVERAGE · 24 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
KALV
KALVISTA PHARMACEUTICALS, INC.
SALE
21,386$17.76$379.8K5,107,954Mar 26, 2026Mar 27, 2026 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
SALE
3,183$19.12$60.9K5,089,354Mar 26, 2026Mar 27, 2026 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
SALE
15,417$18.82$290.1K5,092,537Mar 26, 2026Mar 27, 2026 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
SALE
174,485$16.95$2.96M5,129,500Mar 25, 2026Mar 27, 2026 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
SALE
160$17.53$2.8K5,129,340Mar 25, 2026Mar 27, 2026 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
25,000$9.42$235.5K5,303,985Apr 9, 2025Apr 11, 2025 ↗View →
ORKA
ORUKA THERAPEUTICS, INC.
PURCHASE
88,794$11.44$1.02M4,148,428Feb 14, 2025Feb 27, 2025 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
61,700$9.33$575.7K5,278,985Feb 13, 2025Feb 14, 2025 ↗View →
ORKA
ORUKA THERAPEUTICS, INC.
PURCHASE
14,950$11.63$173.9K4,059,634Feb 13, 2025Feb 27, 2025 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
100,000$9.23$923.0K5,217,285Feb 12, 2025Feb 14, 2025 ↗View →
ORKA
ORUKA THERAPEUTICS, INC.
PURCHASE
8,971$11.86$106.4K4,044,684Feb 12, 2025Feb 27, 2025 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
26,703$9.18$245.1K5,117,285Feb 11, 2025Feb 11, 2025 ↗View →
ORKA
ORUKA THERAPEUTICS, INC.
PURCHASE
9,593$10.95$105.0K4,035,713Feb 11, 2025Feb 27, 2025 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
4,137$9.14$37.8K5,090,582Feb 10, 2025Feb 11, 2025 ↗View →
ORKA
ORUKA THERAPEUTICS, INC.
PURCHASE
574$10.90$6.3K4,026,120Feb 10, 2025Feb 27, 2025 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
73,649$9.29$684.2K5,086,445Feb 7, 2025Feb 11, 2025 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
14,562$9.22$134.3K5,012,796Feb 3, 2025Feb 3, 2025 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
11,754$8.89$104.5K4,998,234Jan 31, 2025Feb 3, 2025 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
43,707$8.76$382.9K4,986,480Jan 30, 2025Feb 3, 2025 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
655,738$15.25$10.00M655,738Feb 20, 2024Feb 22, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
29,747$14.70$437.3K4,824,731Feb 8, 2024Feb 8, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
51,827$14.56$754.6K4,794,984Feb 7, 2024Feb 8, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
4,474$14.74$65.9K4,743,157Feb 6, 2024Feb 8, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
88,099$14.47$1.27M4,738,683Jan 30, 2024Feb 1, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
80,600$14.22$1.15M4,650,584Jan 29, 2024Jan 29, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
4,174$12.98$54.2K4,569,984Jan 26, 2024Jan 29, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
7,030$12.73$89.5K4,565,810Jan 25, 2024Jan 29, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
20,686$12.44$257.3K4,558,780Jan 24, 2024Jan 24, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
10,897$12.54$136.6K4,538,094Jan 23, 2024Jan 24, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
67,546$12.55$847.7K4,527,197Jan 22, 2024Jan 24, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
25,000$12.43$310.8K4,459,651Jan 19, 2024Jan 19, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
39,680$12.51$496.4K4,434,651Jan 18, 2024Jan 19, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
78,925$12.60$994.5K4,394,971Jan 17, 2024Jan 19, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
19,599$12.73$249.5K4,316,046Jan 16, 2024Jan 16, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
6,647$12.68$84.3K4,296,447Jan 11, 2024Jan 16, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
47,700$12.67$604.4K4,289,800Jan 10, 2024Jan 10, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
20,816$12.56$261.4K4,242,100Jan 9, 2024Jan 10, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
69,184$12.44$860.6K4,221,284Jan 8, 2024Jan 10, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
41,764$12.11$505.8K4,152,100Jan 4, 2024Jan 5, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
17,605$12.20$214.8K4,110,336Jan 3, 2024Jan 5, 2024 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
6,013$12.49$75.1K4,092,731Dec 29, 2023Dec 29, 2023 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
471,490$12.50$5.89M4,086,718Dec 28, 2023Dec 29, 2023 ↗View →
KALV
KALVISTA PHARMACEUTICALS, INC.
PURCHASE
41,514$11.97$496.9K3,615,228Dec 27, 2023Dec 29, 2023 ↗View →
VTGN
VISTAGEN THERAPEUTICS, INC.
SALE
60,000$0.89$53.4K20,637,286Jul 12, 2022Jul 14, 2022 ↗View →
ALT
ALTIMMUNE, INC.
SALE
1,000,000——3,500,000Feb 25, 2021Mar 1, 2021 ↗View →
ALT
ALTIMMUNE, INC.
PURCHASE
1,000,000——1,000,000Feb 25, 2021Mar 1, 2021 ↗View →
ALT
ALTIMMUNE, INC.
PURCHASE
1,500,000$7.54$11.31M4,500,000Jun 15, 2020Jun 15, 2020 ↗View →
ALT
ALTIMMUNE, INC.
PURCHASE
173,711$8.87$1.54M3,000,000May 28, 2020May 28, 2020 ↗View →
ALT
ALTIMMUNE, INC.
PURCHASE
27,763$7.79$216.3K2,826,289May 28, 2020May 28, 2020 ↗View →
ALT
ALTIMMUNE, INC.
PURCHASE
125,162$7.23$904.9K2,521,526May 27, 2020May 28, 2020 ↗View →
ALT
ALTIMMUNE, INC.
PURCHASE
277,000$7.92$2.19M2,798,526May 27, 2020May 28, 2020 ↗View →
ALT
ALTIMMUNE, INC.
PURCHASE
309,453$8.79$2.72M2,005,817May 26, 2020May 28, 2020 ↗View →
ALT
ALTIMMUNE, INC.
PURCHASE
390,547$9.78$3.82M2,396,364May 26, 2020May 28, 2020 ↗View →
Other insiders · ALT
Loading peer insiders…
About this filer
CIK 0001615979
ROLE
10% Owner
PRIMARY
ALT
COMPANIES
4
ACTIVE SINCE
May 2020
MARKETPEEL · /INSIDER/0001615979DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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