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 | |
|---|---|---|---|---|---|---|
1101
CALL
KLA
KLAC
$281B
| $3.21M | 0.01% |
1,800
-2,590
| -59% | -$43.4K |
|
|
ABB
1102
CALL
DELISTED
ABB Ltd
ABB
| $3.21M | 0.01% |
1,331
+50
| +4% | +$1.07K |
|
|
MNDT
1103
CALL
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $3.21M | 0.01% |
1,940
+289
| +18% | +$4.64K |
|
1104
CALL
Kinder Morgan
KMI
$73.3B
| $3.21M | 0.01% |
1,514
-450
| -23% | -$9.11K |
|
|
DAY
1105
PUT
DELISTED
Dayforce
DAY
| $3.2M | 0.01% |
472
+240
| +103% | +$13.3K |
|
1106
CALL
Albemarle
ALB
$13.8B
| $3.19M | 0.01% |
437
-446
| -51% | -$29.8K |
|
1107
PUT
Rockwell Automation
ROK
$51.4B
| $3.18M | 0.01% |
157
-192
| -55% | -$35.6K |
|
1108
CALL
AngloGold Ashanti
AU
$40B
| $3.17M | 0.01% |
1,420
-164
| -10% | -$3.3K |
|
|
MIC
1109
PUT
DELISTED
Macquarie Infrastructure Holdings, LLC
MIC
| $3.17M | 0.01% |
739
-273
| -27% | -$11.3K |
|
1110
PUT
PTC Therapeutics
PTCT
$6.52B
| $3.16M | 0.01% |
658
+316
| +92% | +$13.4K |
|
1111
CALL
StoneCo
STNE
$2.69B
| $3.16M | 0.01% |
792
+159
| +25% | +$5.82K |
|
1112
State Street Industrial Select Sector SPDR ETF
XLI
$33.9B
| $3.16M | 0.01% |
38,765
-48,057
| -55% | -$3.84M |
|
1113
General Motors
GM
$74.8B
| $3.16M | 0.01% |
86,242
+20,641
| +31% | +$750K |
|
1114
PUT
NRG Energy
NRG
$30.1B
| $3.16M | 0.01% |
794
+398
| +101% | +$15.7K |
|
1115
PUT
Globus Medical
GMED
$10.3B
| $3.15M | 0.01% |
536
+341
| +175% | +$18.5K |
|
|
SPR
1116
PUT
DELISTED
Spirit AeroSystems
SPR
| $3.15M | 0.01% |
433
+264
| +156% | +$21.8K |
|
1117
PUT
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$252M
| $3.15M | 0.01% |
+86
| New | +$24.9K |
|
1118
CALL
Viasat
VSAT
$9.78B
| $3.15M | 0.01% |
430
+96
| +29% | +$6.87K |
|
1119
CALL
TG Therapeutics
TGTX
$8.35B
| $3.14M | 0.01% |
2,831
+1,679
| +146% | +$12.8K |
|
|
SRCL
1120
CALL
DELISTED
Stericycle Inc
SRCL
| $3.13M | 0.01% |
490
+430
| +717% | +$25.4K |
|
1121
PUT
Ashland
ASH
$3.07B
| $3.12M | 0.01% |
408
+186
| +84% | +$14.1K |
|
1122
CALL
Jazz Pharmaceuticals
JAZZ
$16B
| $3.12M | 0.01% |
209
+59
| +39% | +$8.03K |
|
1123
CALL
Inspire Medical Systems
INSP
$1.48B
| $3.11M | 0.01% |
419
+360
| +610% | +$23.1K |
|
1124
CALL
Advance Auto Parts
AAP
$3.23B
| $3.11M | 0.01% |
194
-171
| -47% | -$27.4K |
|
1125
CALL
Hasbro
HAS
$12.5B
| $3.1M | 0.01% |
294
+148
| +101% | +$15.4K |
|
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.