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 | |
|---|---|---|---|---|---|---|
|
SEE
2651
PUT
DELISTED
Sealed Air
SEE
| $549K | ﹤0.01% |
138
+79
| +134% | +$3.13K |
|
|
CPE
2652
DELISTED
Callon Petroleum Company
CPE
| $549K | ﹤0.01% |
11,381
+11,016
| +3,018% | +$456K |
|
|
SCIU
2653
PUT
DELISTED
Global X Scientific Beta US ETF
SCIU
| $549K | ﹤0.01% |
211
-57
| -21% | -$1.95K |
|
2654
PUT
Allogene Therapeutics
ALLO
$601M
| $548K | ﹤0.01% |
211
+178
| +539% | +$4.9K |
|
2655
Invesco Senior Loan ETF
BKLN
$7.1B
| $546K | ﹤0.01% |
+23,951
| New | +$540K |
|
2656
PUT
Cabot Corp
CBT
$4.65B
| $546K | ﹤0.01% |
115
+97
| +539% | +$4.5K |
|
2657
PUT
Philips
PHG
$25.4B
| $546K | ﹤0.01% |
141
-162
| -53% | -$5.86K |
|
2658
PUT
Wyndham Hotels & Resorts
WH
$5.46B
| $546K | ﹤0.01% |
87
-33
| -28% | -$1.83K |
|
|
MLNX
2659
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $546K | ﹤0.01% |
4,667
+4,567
| +4,567% | +$519K |
|
2660
Ultragenyx Pharmaceutical
RARE
$2.65B
| $545K | ﹤0.01% |
12,772
+1,659
| +15% | +$68.4K |
|
|
LTHM
2661
PUT
DELISTED
Livent Corporation
LTHM
| $545K | ﹤0.01% |
638
+427
| +202% | +$3.27K |
|
2662
Harmony Gold Mining
HMY
$9.92B
| $544K | ﹤0.01% |
150,061
-7,756
| -5% | -$24.9K |
|
2663
Marvell Technology
MRVL
$174B
| $544K | ﹤0.01% |
20,483
+1,849
| +10% | +$46.9K |
|
2664
Natera
NTRA
$37.5B
| $544K | ﹤0.01% |
16,157
+13,898
| +615% | +$512K |
|
|
LCI
2665
DELISTED
Lannett Company, Inc.
LCI
| $544K | ﹤0.01% |
+15,438
| New | +$628K |
|
2666
PUT
Antero Midstream
AM
$10.8B
| $543K | ﹤0.01% |
716
+686
| +2,287% | +$4.34K |
|
2667
CALL
Q2 Holdings
QTWO
$3.42B
| $543K | ﹤0.01% |
67
-24
| -26% | -$1.84K |
|
2668
Knight Transportation
KNX
$11.8B
| $542K | ﹤0.01% |
+15,146
| New | +$556K |
|
2669
Penumbra
PEN
$12.5B
| $542K | ﹤0.01% |
3,303
-4,080
| -55% | -$649K |
|
2670
CALL
Plains GP Holdings
PAGP
$5.23B
| $541K | ﹤0.01% |
286
+165
| +136% | +$3.1K |
|
2671
PUT
A.O. Smith
AOS
$8.38B
| $538K | ﹤0.01% |
113
-70
| -38% | -$3.39K |
|
2672
Brown-Forman Class B
BF.B
$12B
| $538K | ﹤0.01% |
7,962
+6,133
| +335% | +$398K |
|
2673
PUT
MGIC Investment
MTG
$6.27B
| $538K | ﹤0.01% |
380
-174
| -31% | -$2.41K |
|
2674
PUT
Guidewire Software
GWRE
$11.5B
| $537K | ﹤0.01% |
49
-6
| -11% | -$671 |
|
2675
Radware
RDWR
$1.24B
| $537K | ﹤0.01% |
20,831
-18,105
| -46% | -$429K |
|
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.