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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 97.5% |
| 2 | Communication Services | 0.5% |
| 3 | Consumer Discretionary | 0.49% |
| 4 | Technology | 0.41% |
| 5 | Financials | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
401
PUT
Western Digital
WDC
$169B
| $8.08M | 0.02% |
2,892
-1,241
| -30% | -$44K |
|
402
PUT
Intuit
INTU
$91B
| $8.07M | 0.02% |
410
+41
| +11% | +$8.53K |
|
403
PUT
Advance Auto Parts
AAP
$2.67B
| $8.06M | 0.02% |
512
+319
| +165% | +$53.3K |
|
404
CALL
APA Corp
APA
$15B
| $8.02M | 0.02% |
3,056
+1,140
| +59% | +$42K |
|
405
CALL
Allstate
ALL
$65.6B
| $7.99M | 0.02% |
967
+879
| +999% | +$78.9K |
|
|
XLNX
406
PUT
DELISTED
Xilinx Inc
XLNX
| $7.97M | 0.02% |
936
+350
| +60% | +$29.3K |
|
407
SLB Ltd
SLB
$85.3B
| $7.96M | 0.02% |
220,580
+54,683
| +33% | +$2.7M |
|
408
CALL
Prudential Financial
PRU
$42.1B
| $7.91M | 0.02% |
970
+574
| +145% | +$52.9K |
|
409
PUT
D.R. Horton
DHI
$39.9B
| $7.89M | 0.02% |
2,276
+1,348
| +145% | +$49.2K |
|
410
CALL
Seagate
STX
$192B
| $7.84M | 0.02% |
2,032
+952
| +88% | +$40.1K |
|
411
CALL
PG&E
PCG
$31.5B
| $7.82M | 0.02% |
3,291
+975
| +42% | +$34.9K |
|
412
PUT
TJX Companies
TJX
$145B
| $7.8M | 0.02% |
1,743
+959
| +122% | +$48.5K |
|
|
SPLK
413
CALL
DELISTED
Splunk Inc
SPLK
| $7.73M | 0.02% |
737
-122
| -14% | -$12.3K |
|
414
CALL
Vanguard S&P 500 ETF
VOO
$1.05T
| $7.73M | 0.02% |
824
+117
| +17% | +$29K |
|
|
SCHW
415
CALL
Charles Schwab
SCHW
$189B
| $7.72M | 0.02% |
1,860
+911
| +96% | +$41.2K |
|
416
PUT
Halliburton
HAL
$30.9B
| $7.71M | 0.02% |
2,900
-273
| -9% | -$9.21K |
|
417
CALL
TripAdvisor
TRIP
$1.09B
| $7.7M | 0.02% |
1,428
+726
| +103% | +$40.2K |
|
418
PUT
Newmont
NEM
$135B
| $7.69M | 0.02% |
2,219
+1,124
| +103% | +$36.4K |
|
419
CALL
Chubb
CB
$132B
| $7.69M | 0.02% |
595
+226
| +61% | +$29.2K |
|
420
PUT
Ecolab
ECL
$78.3B
| $7.65M | 0.02% |
519
+476
| +1,107% | +$72.7K |
|
421
PUT
Take-Two Interactive
TTWO
$40.1B
| $7.58M | 0.02% |
736
-311
| -30% | -$35.8K |
|
422
PUT
iShares MSCI Global Gold Miners ETF
RING
$2.53B
| $7.54M | 0.02% |
1,595
+1,213
| +318% | +$18.4K |
|
423
PUT
Philip Morris
PM
$284B
| $7.52M | 0.02% |
1,127
-1,612
| -59% | -$135K |
|
424
Roku
ROKU
$23.1B
| $7.51M | 0.02% |
245,080
+26,183
| +12% | +$1.23M |
|
425
CALL
Diamondback Energy
FANG
$55.8B
| $7.49M | 0.02% |
808
+570
| +239% | +$63.7K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,572 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, up from 95% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,572 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.