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 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
351
Wynn Resorts
WYNN
$9.79B
| $9.6M | 0.03% |
97,069
+52,398
| +117% | +$5.65M |
|
352
CALL
CSX Corp
CSX
$92.8B
| $9.51M | 0.03% |
4,590
+1,020
| +29% | +$23.5K |
|
|
SIVB
353
PUT
DELISTED
SVB Financial Group
SIVB
| $9.5M | 0.03% |
500
+94
| +23% | +$23K |
|
354
CALL
TJX Companies
TJX
$172B
| $9.39M | 0.03% |
2,100
+64
| +3% | +$3.23K |
|
|
ATHN
355
PUT
DELISTED
Athenahealth, Inc.
ATHN
| $9.35M | 0.03% |
709
+340
| +92% | +$43.6K |
|
356
PUT
Medtronic
MDT
$105B
| $9.33M | 0.03% |
1,026
+178
| +21% | +$16.6K |
|
357
PUT
Cheniere Energy
LNG
$56B
| $9.31M | 0.03% |
1,573
+631
| +67% | +$38.8K |
|
|
UWC
358
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $9.28M | 0.03% |
2,555
+611
| +31% | +$2.22M |
|
|
PXD
359
PUT
DELISTED
Pioneer Natural Resource Co.
PXD
| $9.27M | 0.03% |
705
+218
| +45% | +$33.3K |
|
360
PUT
Centene
CNC
$32.5B
| $9.26M | 0.03% |
1,606
+946
| +143% | +$63.3K |
|
|
CEO
361
PUT
DELISTED
CNOOC Limited
CEO
| $9.21M | 0.03% |
604
+477
| +376% | +$81.1K |
|
|
EXAS
362
CALL
DELISTED
Exact Sciences
EXAS
| $9.21M | 0.03% |
1,459
+308
| +27% | +$21.1K |
|
363
PUT
Vale
VALE
$63.2B
| $9.2M | 0.03% |
6,978
+6,140
| +733% | +$87.8K |
|
364
PUT
Seagate
STX
$205B
| $9.15M | 0.03% |
2,372
+984
| +71% | +$41.4K |
|
|
PPLC
365
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $9.14M | 0.03% |
4,432
+1,819
| +70% | +$65.7K |
|
366
CALL
Humana
HUM
$47.7B
| $9.14M | 0.03% |
319
+28
| +10% | +$8.88K |
|
|
DNB
367
CALL
DELISTED
Dun & Bradstreet
DNB
| $8.99M | 0.03% |
630
+318
| +102% | +$45.3K |
|
368
PUT
Best Buy
BBY
$18.4B
| $8.97M | 0.03% |
1,693
+473
| +39% | +$30.9K |
|
|
LSI
369
PUT
DELISTED
Life Storage, Inc.
LSI
| $8.83M | 0.03% |
1,425
+724
| +103% | +$45.9K |
|
370
CALL
American International
AIG
$41.5B
| $8.81M | 0.03% |
2,235
+1,052
| +89% | +$45.9K |
|
371
CALL
NetEase
NTES
$77.6B
| $8.8M | 0.03% |
1,870
-205
| -10% | -$9.25K |
|
372
PUT
Simon Property Group
SPG
$73.4B
| $8.8M | 0.03% |
524
+299
| +133% | +$53.5K |
|
373
PUT
Burlington
BURL
$22.3B
| $8.7M | 0.03% |
535
+64
| +14% | +$10.3K |
|
|
IRBT
374
PUT
DELISTED
iRobot
IRBT
| $8.68M | 0.03% |
1,037
-66
| -6% | -$5.98K |
|
375
CALL
MGM Resorts International
MGM
$11.6B
| $8.68M | 0.03% |
3,578
+1,151
| +47% | +$30K |
|
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 1,573 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 Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- 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 1,573 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.