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 | |
|---|---|---|---|---|---|---|
2376
CALL
MPLX
MPLX
$59.5B
| $728K | ﹤0.01% |
286
+96
| +51% | +$2.45K |
|
2377
PUT
Gentex
GNTX
$4.88B
| $727K | ﹤0.01% |
251
+248
| +8,267% | +$6.98K |
|
|
DRRX
2378
PUT
DELISTED
DURECT Corp
DRRX
| $726K | ﹤0.01% |
191
+187
| +4,675% | +$3.85K |
|
|
HUYA
2379
Huya Inc
HUYA
$542M
| $726K | ﹤0.01% |
40,485
+1,169
| +3% | +$24.7K |
|
2380
PUT
Camtek
CAMT
$6.9B
| $723K | ﹤0.01% |
668
+34
| +5% | +$354 |
|
2381
PUT
Synopsys
SNPS
$71.5B
| $723K | ﹤0.01% |
52
-137
| -72% | -$18.8K |
|
2382
PUT
Polaris
PII
$4.15B
| $722K | ﹤0.01% |
71
-33
| -32% | -$3.2K |
|
|
EIGI
2383
PUT
DELISTED
Endurance International Group Holdings, Inc.
EIGI
| $722K | ﹤0.01% |
1,537
+1,245
| +426% | +$5.12K |
|
2384
CALL
Hain Celestial
HAIN
$47.8M
| $721K | ﹤0.01% |
278
+70
| +34% | +$1.67K |
|
2385
PUT
Alcoa
AA
$11.7B
| $720K | ﹤0.01% |
335
-769
| -70% | -$15.9K |
|
|
HEP
2386
DELISTED
Holly Energy Partners, L.P.
HEP
| $718K | ﹤0.01% |
32,446
+22,938
| +241% | +$521K |
|
|
SAIL
2387
DELISTED
SailPoint Technologies Holdings, Inc. Common Stock
SAIL
| $718K | ﹤0.01% |
30,446
+27,897
| +1,094% | +$610K |
|
2388
CALL
BorgWarner
BWA
$13.2B
| $715K | ﹤0.01% |
187
-120
| -39% | -$4.4K |
|
2389
CALL
MACOM Technology Solutions
MTSI
$20.4B
| $715K | ﹤0.01% |
269
-88
| -25% | -$2.1K |
|
2390
PUT
Wingstop
WING
$3.68B
| $715K | ﹤0.01% |
83
+23
| +38% | +$1.91K |
|
2391
CALL
FIVE9
FIVN
$1.77B
| $714K | ﹤0.01% |
109
-118
| -52% | -$7.22K |
|
2392
PUT
Generac Holdings
GNRC
$11.9B
| $714K | ﹤0.01% |
71
+58
| +446% | +$5.4K |
|
2393
PUT
Iovance Biotherapeutics
IOVA
$2.23B
| $714K | ﹤0.01% |
258
-28
| -10% | -$637 |
|
2394
CALL
SSR Mining
SSRM
$5.57B
| $714K | ﹤0.01% |
371
+23
| +7% | +$358 |
|
2395
CALL
Coty
COTY
$2.33B
| $713K | ﹤0.01% |
634
-419
| -40% | -$4.77K |
|
2396
CALL
Service Corp International
SCI
$11.4B
| $713K | ﹤0.01% |
155
-403
| -72% | -$18.2K |
|
2397
CALL
Trimble
TRMB
$12.3B
| $712K | ﹤0.01% |
171
+102
| +148% | +$4.06K |
|
2398
argenx
ARGX
$57.4B
| $711K | ﹤0.01% |
4,432
+2,828
| +176% | +$382K |
|
2399
PUT
Xcel Energy
XEL
$51B
| $711K | ﹤0.01% |
112
+64
| +133% | +$4K |
|
2400
PUT
Digital Turbine
APPS
$1.02B
| $710K | ﹤0.01% |
996
+909
| +1,045% | +$6.76K |
|
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.