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 | |
|---|---|---|---|---|---|---|
926
PUT
Nordson
NDSN
$16.3B
| $2.58M | 0.01% |
216
+209
| +2,986% | +$25.7K |
|
927
PUT
T-Mobile US
TMUS
$183B
| $2.57M | 0.01% |
404
-2,322
| -85% | -$156K |
|
928
PUT
West Pharmaceutical
WST
$25B
| $2.56M | 0.01% |
+261
| New | +$28.3K |
|
929
PUT
Alaska Air
ALK
$4.99B
| $2.56M | 0.01% |
420
+134
| +47% | +$8.67K |
|
|
TSS
930
CALL
DELISTED
Total System Services, Inc.
TSS
| $2.55M | 0.01% |
314
-100
| -24% | -$8.86K |
|
931
CALL
FMC
FMC
$1.46B
| $2.55M | 0.01% |
398
+250
| +169% | +$17.5K |
|
932
CALL
Autohome
ATHM
$2.45B
| $2.55M | 0.01% |
326
+309
| +1,818% | +$23.3K |
|
933
Colgate-Palmolive
CL
$72.1B
| $2.55M | 0.01% |
+42,849
| New | +$2.68M |
|
934
PUT
TransDigm Group
TDG
$67.9B
| $2.55M | 0.01% |
75
+2
| +3% | +$686 |
|
935
CALL
SAP
SAP
$171B
| $2.55M | 0.01% |
256
+183
| +251% | +$19.5K |
|
936
iShares MSCI South Korea ETF
EWY
$23.2B
| $2.54M | 0.01% |
43,253
+24,460
| +130% | +$1.48M |
|
|
WLL
937
CALL
DELISTED
Whiting Petroleum Corporation
WLL
| $2.54M | 0.01% |
15
+10
| +200% | +$25.7K |
|
938
CALL
Estee Lauder
EL
$28.9B
| $2.54M | 0.01% |
195
-339
| -63% | -$46K |
|
939
PUT
Molina Healthcare
MOH
$10.5B
| $2.53M | 0.01% |
218
-149
| -41% | -$19.5K |
|
|
BBBY
940
PUT
DELISTED
Bed Bath & Beyond Inc
BBBY
| $2.53M | 0.01% |
2,235
+997
| +81% | +$13K |
|
|
AERI
941
CALL
DELISTED
Aerie Pharmaceuticals
AERI
| $2.52M | 0.01% |
699
+686
| +5,277% | +$32.2K |
|
942
PUT
Alnylam Pharmaceuticals
ALNY
$35.9B
| $2.52M | 0.01% |
346
-71
| -17% | -$5.46K |
|
943
CALL
Cadence Design Systems
CDNS
$91.1B
| $2.52M | 0.01% |
579
+568
| +5,164% | +$24.7K |
|
|
DISCK
944
PUT
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $2.51M | 0.01% |
1,025
+212
| +26% | +$5.9K |
|
945
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$107M
| $2.51M | 0.01% |
1,146
-294
| -20% | -$6.36K |
|
946
Norfolk Southern
NSC
$78.3B
| $2.51M | 0.01% |
16,798
-12,076
| -42% | -$1.99M |
|
947
PUT
Sempra
SRE
$61.1B
| $2.51M | 0.01% |
464
+140
| +43% | +$7.98K |
|
948
CALL
ResMed
RMD
$27.8B
| $2.5M | 0.01% |
220
+189
| +610% | +$20.3K |
|
949
CALL
M&T Bank
MTB
$35.6B
| $2.5M | 0.01% |
175
-220
| -56% | -$35.2K |
|
950
AbbVie
ABBV
$454B
| $2.5M | 0.01% |
+27,149
| New | +$2.39M |
|
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.