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 | |
|---|---|---|---|---|---|---|
726
Verizon
VZ
$183B
| $3.64M | 0.01% |
64,709
-27,393
| -30% | -$1.55M |
|
727
CALL
Boston Beer
SAM
$1.82B
| $3.64M | 0.01% |
151
+2
| +1% | +$559 |
|
|
OPLN
728
CALL
Openlane
OPLN
$4.13B
| $3.63M | 0.01% |
2,008
+1,910
| +1,949% | +$39.6K |
|
|
AMTD
729
PUT
DELISTED
TD Ameritrade Holding Corp
AMTD
| $3.62M | 0.01% |
740
-143
| -16% | -$7.28K |
|
730
CALL
Centene
CNC
$31.5B
| $3.62M | 0.01% |
628
+62
| +11% | +$4.15K |
|
731
PUT
Baxter International
BAX
$11.2B
| $3.61M | 0.01% |
549
+492
| +863% | +$33.1K |
|
732
CALL
T. Rowe Price
TROW
$24.6B
| $3.61M | 0.01% |
391
+117
| +43% | +$11.4K |
|
733
PUT
WIX.com
WIX
$2.04B
| $3.6M | 0.01% |
398
+129
| +48% | +$12.2K |
|
734
PUT
National Grid
NGG
$82B
| $3.59M | 0.01% |
847
+741
| +699% | +$34.6K |
|
735
CALL
Sprouts Farmers Market
SFM
$6.91B
| $3.58M | 0.01% |
1,525
+445
| +41% | +$11.6K |
|
736
PUT
United States Natural Gas Fund
UNG
$473M
| $3.58M | 0.01% |
363
+266
| +274% | +$32.2K |
|
737
PUT
CarMax
KMX
$8.29B
| $3.58M | 0.01% |
571
+337
| +144% | +$22.2K |
|
738
CALL
NetApp
NTAP
$32.3B
| $3.57M | 0.01% |
599
-244
| -29% | -$17.5K |
|
739
Old Dominion Freight Line
ODFL
$48B
| $3.57M | 0.01% |
86,781
+67,092
| +341% | +$2.97M |
|
740
CALL
Genesco
GCO
$388M
| $3.57M | 0.01% |
806
+447
| +125% | +$19.3K |
|
741
D.R. Horton
DHI
$39.9B
| $3.57M | 0.01% |
+102,980
| New | +$3.76M |
|
742
CALL
Tandem Diabetes Care
TNDM
$1.16B
| $3.54M | 0.01% |
933
-85
| -8% | -$3K |
|
743
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$21.3B
| $3.54M | 0.01% |
71,452
+20,772
| +41% | +$1.1M |
|
744
PUT
Danaher
DHR
$135B
| $3.53M | 0.01% |
386
-498
| -56% | -$45.2K |
|
745
CALL
Omnicom Group
OMC
$22.2B
| $3.52M | 0.01% |
481
+48
| +11% | +$3.56K |
|
746
CALL
Honeywell
HON
$78B
| $3.52M | 0.01% |
839
-31
| -4% | -$4.23K |
|
747
CALL
Analog Devices
ADI
$185B
| $3.52M | 0.01% |
410
-75
| -15% | -$6.49K |
|
748
PUT
Lumen
LUMN
$6.73B
| $3.51M | 0.01% |
2,317
-2,163
| -48% | -$41.3K |
|
749
CALL
Marvell Technology
MRVL
$188B
| $3.5M | 0.01% |
2,165
+984
| +83% | +$16.3K |
|
750
PUT
TAL Education Group
TAL
$5.74B
| $3.5M | 0.01% |
1,313
-558
| -30% | -$14.8K |
|
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.