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 | |
|---|---|---|---|---|---|---|
|
TYNS
676
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $4.03M | 0.01% |
982
-234
| -19% | -$6.74K |
|
677
CALL
T-Mobile US
TMUS
$195B
| $4.03M | 0.01% |
633
-531
| -46% | -$35.6K |
|
678
PUT
Boston Beer
SAM
$1.74B
| $4.02M | 0.01% |
167
-49
| -23% | -$13.7K |
|
679
CALL
General Mills
GIS
$20.5B
| $4.01M | 0.01% |
1,030
-88
| -8% | -$3.72K |
|
|
WWE
680
CALL
DELISTED
World Wrestling Entertainment
WWE
| $4M | 0.01% |
535
+300
| +128% | +$22.5K |
|
|
GRUB
681
CALL
DELISTED
Just Eat Takeaway.com N.V. American Depositary Shares
GRUB
| $3.99M | 0.01% |
260
-18
| -6% | -$3.38K |
|
|
HES
682
CALL
DELISTED
Hess
HES
| $3.98M | 0.01% |
984
+4
| +0.4% | +$228 |
|
683
PUT
Cardinal Health
CAH
$57.5B
| $3.97M | 0.01% |
891
+404
| +83% | +$21.1K |
|
684
PUT
Martin Marietta Materials
MLM
$36.6B
| $3.95M | 0.01% |
230
-117
| -34% | -$20.8K |
|
685
CALL
Fortinet
FTNT
$115B
| $3.95M | 0.01% |
2,805
+1,100
| +65% | +$16.8K |
|
686
CALL
SBA Communications
SBAC
$20.1B
| $3.95M | 0.01% |
244
+8
| +3% | +$1.3K |
|
687
CALL
Papa John's
PZZA
$747M
| $3.95M | 0.01% |
992
-692
| -41% | -$34.9K |
|
|
ABMD
688
PUT
DELISTED
Abiomed Inc
ABMD
| $3.9M | 0.01% |
120
-658
| -85% | -$229K |
|
689
PUT
Stellantis
STLA
$16.1B
| $3.9M | 0.01% |
2,697
+1,075
| +66% | +$17.3K |
|
|
ATVI
690
DELISTED
Activision Blizzard
ATVI
| $3.9M | 0.01% |
+83,706
| New | +$5.01M |
|
|
WRK
691
CALL
DELISTED
WestRock Company
WRK
| $3.89M | 0.01% |
1,030
+633
| +159% | +$27.9K |
|
692
PUT
Pinduoduo
PDD
$117B
| $3.89M | 0.01% |
1,733
+183
| +12% | +$3.86K |
|
693
PUT
DaVita
DVA
$11.7B
| $3.88M | 0.01% |
755
+218
| +41% | +$14K |
|
694
CALL
Mondelez International
MDLZ
$78.2B
| $3.87M | 0.01% |
968
-369
| -28% | -$15.7K |
|
695
CALL
Newell Brands
NWL
$2.6B
| $3.86M | 0.01% |
2,079
+1,030
| +98% | +$20.5K |
|
696
PUT
GSK
GSK
$100B
| $3.86M | 0.01% |
808
+278
| +52% | +$13.7K |
|
|
CTRA
697
CALL
DELISTED
Coterra Energy
CTRA
| $3.85M | 0.01% |
1,725
+626
| +57% | +$15.1K |
|
698
CALL
Wayfair
W
$13.6B
| $3.85M | 0.01% |
428
-4
| -0.9% | -$421 |
|
699
PUT
Royal Caribbean
RCL
$70.9B
| $3.84M | 0.01% |
393
-316
| -45% | -$34.6K |
|
700
PUT
Energy Transfer Partners
ET
$74B
| $3.84M | 0.01% |
2,907
+2,677
| +1,164% | +$40.7K |
|
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.