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 | |
|---|---|---|---|---|---|---|
601
CALL
Nucor
NUE
$54.9B
| $4.77M | 0.01% |
921
+216
| +31% | +$12.8K |
|
602
PUT
Intercontinental Exchange
ICE
$81B
| $4.77M | 0.01% |
633
+356
| +129% | +$27.3K |
|
603
PUT
Weibo
WB
$1.92B
| $4.76M | 0.01% |
814
-367
| -31% | -$22.2K |
|
604
CALL
Neurocrine Biosciences
NBIX
$17.5B
| $4.73M | 0.01% |
663
+414
| +166% | +$39.7K |
|
605
CALL
General Dynamics
GD
$103B
| $4.73M | 0.01% |
301
-4
| -1% | -$717 |
|
606
CALL
Baxter International
BAX
$11.2B
| $4.72M | 0.01% |
717
+373
| +108% | +$25.1K |
|
607
CALL
Martin Marietta Materials
MLM
$32.8B
| $4.69M | 0.01% |
273
-14
| -5% | -$2.49K |
|
608
CALL
Macy's
M
$6.14B
| $4.68M | 0.01% |
1,573
-243
| -13% | -$8K |
|
609
CALL
Truist Financial
TFC
$62.5B
| $4.67M | 0.01% |
1,077
+70
| +7% | +$3.36K |
|
610
CALL
Dominion Energy
D
$62.8B
| $4.65M | 0.01% |
651
+48
| +8% | +$3.51K |
|
611
PUT
General Mills
GIS
$19B
| $4.65M | 0.01% |
1,194
+118
| +11% | +$4.99K |
|
612
PUT
Acuity Brands
AYI
$9.79B
| $4.64M | 0.01% |
404
+56
| +16% | +$6.91K |
|
613
Citigroup
C
$221B
| $4.63M | 0.01% |
88,841
-254,375
| -74% | -$16.1M |
|
614
PUT
Assured Guaranty
AGO
$3.73B
| $4.62M | 0.01% |
1,208
-221
| -15% | -$8.82K |
|
|
WWE
615
PUT
DELISTED
World Wrestling Entertainment
WWE
| $4.62M | 0.01% |
618
+127
| +26% | +$9.54K |
|
616
PUT
British American Tobacco
BTI
$129B
| $4.62M | 0.01% |
1,449
+1,232
| +568% | +$47.9K |
|
617
PUT
Occidental Petroleum
OXY
$57.3B
| $4.62M | 0.01% |
752
+276
| +58% | +$19.4K |
|
618
PUT
LendingTree
TREE
$550M
| $4.61M | 0.01% |
210
+47
| +29% | +$10.7K |
|
|
ALXN
619
CALL
DELISTED
Alexion Pharmaceuticals
ALXN
| $4.61M | 0.01% |
473
+209
| +79% | +$24.7K |
|
620
TransDigm Group
TDG
$67.9B
| $4.59M | 0.01% |
13,501
+4,333
| +47% | +$1.49M |
|
621
PUT
Vulcan Materials
VMC
$35.7B
| $4.57M | 0.01% |
463
+155
| +50% | +$15.7K |
|
622
CALL
MetLife
MET
$59.5B
| $4.55M | 0.01% |
1,247
-865
| -41% | -$37.1K |
|
623
CALL
Aptiv
APTV
$11.9B
| $4.53M | 0.01% |
741
+626
| +544% | +$45.4K |
|
|
CMA
624
PUT
DELISTED
Comerica
CMA
| $4.53M | 0.01% |
659
-73
| -10% | -$5.8K |
|
625
PUT
Agnico Eagle Mines
AEM
$72.3B
| $4.52M | 0.01% |
1,119
+699
| +166% | +$25.7K |
|
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 1,573 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.