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 | |
|---|---|---|---|---|---|---|
326
PUT
O'Reilly Automotive
ORLY
$71.7B
| $16.4M | 0.04% |
5,610
+750
| +15% | +$21.5K |
|
327
PUT
Fair Isaac
FICO
$28.3B
| $16.3M | 0.04% |
436
-427
| -49% | -$144K |
|
328
CALL
Lockheed Martin
LMT
$119B
| $16.3M | 0.04% |
418
-312
| -43% | -$120K |
|
329
CALL
Charter Communications
CHTR
$15.9B
| $16.3M | 0.04% |
335
+201
| +150% | +$92.5K |
|
|
ITCI
330
PUT
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $16.1M | 0.04% |
4,694
+3,670
| +358% | +$44K |
|
331
CALL
Universal Display
OLED
$3.81B
| $16M | 0.04% |
776
-385
| -33% | -$72.7K |
|
|
RTN
332
CALL
DELISTED
Raytheon Company
RTN
| $15.8M | 0.03% |
721
+8
| +1% | +$1.69K |
|
333
CALL
Nucor
NUE
$53.7B
| $15.8M | 0.03% |
2,810
-301
| -10% | -$16.4K |
|
334
PUT
ASML
ASML
$692B
| $15.8M | 0.03% |
534
+334
| +167% | +$90.2K |
|
335
CALL
Abbott
ABT
$175B
| $15.8M | 0.03% |
1,818
-569
| -24% | -$47.7K |
|
336
CALL
Sarepta Therapeutics
SRPT
$1.67B
| $15.8M | 0.03% |
1,223
+563
| +85% | +$56.8K |
|
337
PUT
Accenture
ACN
$85.7B
| $15.8M | 0.03% |
749
-663
| -47% | -$129K |
|
338
PUT
Analog Devices
ADI
$188B
| $15.7M | 0.03% |
1,325
+278
| +27% | +$31.3K |
|
339
CALL
Cummins
CMI
$91.2B
| $15.7M | 0.03% |
877
+182
| +26% | +$32K |
|
340
Chipotle Mexican Grill
CMG
$41.3B
| $15.6M | 0.03% |
934,300
+687,450
| +278% | +$11M |
|
341
PUT
Delta Air Lines
DAL
$54.9B
| $15.6M | 0.03% |
2,667
-133
| -5% | -$7.46K |
|
342
CALL
Applied Materials
AMAT
$440B
| $15.4M | 0.03% |
2,518
-100
| -4% | -$5.62K |
|
343
CALL
Blackstone
BX
$150B
| $15.3M | 0.03% |
2,735
-4,103
| -60% | -$213K |
|
|
344
PUT
Sarepta Therapeutics
SRPT
$1.67B
| $15.2M | 0.03% |
1,178
+160
| +16% | +$16.1K |
|
345
CALL
Philip Morris
PM
$303B
| $15.2M | 0.03% |
1,781
-1,166
| -40% | -$96.1K |
|
346
PUT
General Motors
GM
$74.1B
| $15.1M | 0.03% |
4,114
+174
| +4% | +$6.32K |
|
347
PUT
Yum! Brands
YUM
$40.7B
| $15M | 0.03% |
1,489
+646
| +77% | +$66.9K |
|
348
CALL
Cracker Barrel
CBRL
$1.19B
| $14.9M | 0.03% |
970
+421
| +77% | +$66.3K |
|
349
PUT
Southern Company
SO
$108B
| $14.9M | 0.03% |
2,334
+606
| +35% | +$37.6K |
|
350
CALL
BP
BP
$112B
| $14.8M | 0.03% |
3,927
-1,017
| -21% | -$38.6K |
|
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.