Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
426
CALL
Valero Energy
VLO
$92.3B
| $11.2M | 0.02% |
1,199
+41
| +4% | +$3.88K |
|
427
PUT
Vanguard Dividend Appreciation ETF
VIG
$110B
| $11.1M | 0.02% |
894
+813
| +1,004% | +$98.4K |
|
|
B
428
CALL
Barrick Mining
B
$62.8B
| $11.1M | 0.02% |
5,984
-1,804
| -23% | -$31K |
|
429
PUT
CME Group
CME
$90.1B
| $11.1M | 0.02% |
553
-102
| -16% | -$20.9K |
|
430
CALL
Humana
HUM
$47.7B
| $11.1M | 0.02% |
302
+67
| +29% | +$21.3K |
|
431
CALL
CrowdStrike
CRWD
$192B
| $11.1M | 0.02% |
8,876
+6,076
| +217% | +$79.7K |
|
|
STZ.B
432
CALL
DELISTED
CONSTELLATION BRANDS, INC. CLASS B
STZ.B
| $11.1M | 0.02% |
583
-423
| -42% | -$80.2K |
|
|
CTXS
433
CALL
DELISTED
Citrix Systems Inc
CTXS
| $11M | 0.02% |
993
-197
| -17% | -$21.2K |
|
|
ABMD
434
CALL
DELISTED
Abiomed Inc
ABMD
| $11M | 0.02% |
643
+445
| +225% | +$82.5K |
|
435
PUT
Alnylam Pharmaceuticals
ALNY
$35.6B
| $11M | 0.02% |
951
+431
| +83% | +$43K |
|
436
CALL
Axsome Therapeutics
AXSM
$12.3B
| $10.9M | 0.02% |
1,052
+885
| +530% | +$35.7K |
|
437
PUT
Tyson Foods
TSN
$20.1B
| $10.8M | 0.02% |
1,189
-770
| -39% | -$66.2K |
|
438
VanEck Semiconductor ETF
SMH
$70.7B
| $10.8M | 0.02% |
+152,942
| New | +$10M |
|
439
CALL
American Electric Power
AEP
$72.4B
| $10.8M | 0.02% |
1,143
+532
| +87% | +$49.1K |
|
440
CALL
Cheniere Energy
LNG
$56B
| $10.7M | 0.02% |
1,756
+266
| +18% | +$16.4K |
|
441
CALL
Dow Inc
DOW
$22.5B
| $10.7M | 0.02% |
1,957
-203
| -9% | -$10.5K |
|
442
PUT
Check Point Software Technologies
CHKP
$13.3B
| $10.7M | 0.02% |
965
+196
| +25% | +$22K |
|
443
CALL
Capital One
COF
$124B
| $10.7M | 0.02% |
1,040
+270
| +35% | +$26K |
|
444
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $10.7M | 0.02% |
+33,147
| New | +$10.2M |
|
|
AYX
445
CALL
DELISTED
Alteryx Inc
AYX
| $10.6M | 0.02% |
1,061
+574
| +118% | +$58.3K |
|
446
CALL
Lyft
LYFT
$5.57B
| $10.6M | 0.02% |
2,460
+512
| +26% | +$22.4K |
|
447
PUT
Arista Networks
ANET
$220B
| $10.5M | 0.02% |
8,224
+5,248
| +176% | +$69K |
|
448
CALL
Chubb
CB
$133B
| $10.4M | 0.02% |
668
+296
| +80% | +$45.3K |
|
449
CALL
United States Natural Gas Fund
UNG
$472M
| $10.4M | 0.02% |
1,541
+788
| +105% | +$61.1K |
|
450
CALL
Dollar Tree
DLTR
$23.5B
| $10.4M | 0.02% |
1,104
+715
| +184% | +$75.1K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.