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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1776
CALL
Republic Services
RSG
$66.7B
| $1.42M | ﹤0.01% |
158
+66
| +72% | +$5.77K |
|
1777
CALL
Gray Television
GTN
$407M
| $1.42M | ﹤0.01% |
660
+422
| +177% | +$7.83K |
|
1778
PUT
Power Integrations
POWI
$3.54B
| $1.41M | ﹤0.01% |
286
+220
| +333% | +$10.1K |
|
1779
CALL
argenx
ARGX
$57.4B
| $1.41M | ﹤0.01% |
88
+86
| +4,300% | +$11.6K |
|
1780
CALL
IDEX
IEX
$16.5B
| $1.41M | ﹤0.01% |
82
+23
| +39% | +$3.72K |
|
1781
CALL
Woodward
WWD
$25B
| $1.41M | ﹤0.01% |
119
+41
| +53% | +$4.63K |
|
|
JOYY
1782
CALL
JOYY Inc
JOYY
$3.73B
| $1.41M | ﹤0.01% |
267
-205
| -43% | -$12.1K |
|
|
SA
1783
PUT
Seabridge Gold
SA
$2.8B
| $1.4M | ﹤0.01% |
1,016
-246
| -19% | -$3.11K |
|
|
MRTX
1784
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $1.4M | ﹤0.01% |
10,866
+6,651
| +158% | +$642K |
|
1785
Caesars Entertainment
CZR
$6.1B
| $1.4M | ﹤0.01% |
+23,470
| New | +$1.16M |
|
1786
CALL
Mid-America Apartment Communities
MAA
$15.6B
| $1.4M | ﹤0.01% |
106
+63
| +147% | +$8.43K |
|
|
SINA
1787
PUT
DELISTED
Sina Corp
SINA
| $1.4M | ﹤0.01% |
350
+218
| +165% | +$8.36K |
|
|
MNDT
1788
PUT
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $1.4M | ﹤0.01% |
844
-184
| -18% | -$2.95K |
|
1789
CALL
Goodyear
GT
$2.07B
| $1.39M | ﹤0.01% |
893
-75
| -8% | -$1.17K |
|
|
SGEN
1790
DELISTED
Seagen Inc. Common Stock
SGEN
| $1.39M | ﹤0.01% |
12,128
-9,147
| -43% | -$970K |
|
1791
PUT
Synaptics
SYNA
$4.41B
| $1.38M | ﹤0.01% |
210
-72
| -26% | -$3.79K |
|
1792
PUT
Genuine Parts
GPC
$17.1B
| $1.38M | ﹤0.01% |
130
+83
| +177% | +$8.53K |
|
1793
Zscaler
ZS
$23B
| $1.38M | ﹤0.01% |
29,665
-25,230
| -46% | -$1.17M |
|
|
NLSN
1794
CALL
DELISTED
Nielsen Holdings plc
NLSN
| $1.38M | ﹤0.01% |
679
-1,668
| -71% | -$33.9K |
|
1795
PUT
Sprouts Farmers Market
SFM
$7.04B
| $1.38M | ﹤0.01% |
712
+680
| +2,125% | +$13.2K |
|
1796
CALL
Jones Lang LaSalle
JLL
$15.1B
| $1.38M | ﹤0.01% |
79
+62
| +365% | +$9.75K |
|
1797
CALL
uniQure
QURE
$2.68B
| $1.38M | ﹤0.01% |
192
-162
| -46% | -$8.89K |
|
1798
CALL
Cadence Design Systems
CDNS
$90B
| $1.37M | ﹤0.01% |
198
-307
| -61% | -$20.6K |
|
1799
CALL
New York Times
NYT
$11.6B
| $1.37M | ﹤0.01% |
427
-650
| -60% | -$20.2K |
|
1800
CALL
Regenxbio
RGNX
$623M
| $1.37M | ﹤0.01% |
335
-58
| -15% | -$2.29K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.