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 | |
|---|---|---|---|---|---|---|
|
EMWP
3701
PUT
DELISTED
Eros Media World PLC
EMWP
| $210K | ﹤0.01% |
31
-15
| -33% | -$700 |
|
3702
CALL
Andersons Inc
ANDE
$2.54B
| $209K | ﹤0.01% |
83
+75
| +938% | +$1.64K |
|
3703
Ardelyx
ARDX
$1.25B
| $209K | ﹤0.01% |
+27,939
| New | +$170K |
|
3704
CALL
Clearwater Paper
CLW
$278M
| $209K | ﹤0.01% |
98
+84
| +600% | +$1.69K |
|
3705
Saic
SAIC
$5.01B
| $209K | ﹤0.01% |
2,412
+1,629
| +208% | +$136K |
|
|
JNCE
3706
DELISTED
Jounce Therapeutics, Inc. Common Stock
JNCE
| $209K | ﹤0.01% |
+24,027
| New | +$130K |
|
|
GLDD
3707
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
| $208K | ﹤0.01% |
184
+136
| +283% | +$1.45K |
|
3708
CALL
Pacira BioSciences
PCRX
$1.04B
| $208K | ﹤0.01% |
46
-313
| -87% | -$13.3K |
|
3709
SiriusPoint
SPNT
$3.01B
| $208K | ﹤0.01% |
19,866
+14,426
| +265% | +$140K |
|
|
LM
3710
CALL
DELISTED
Legg Mason, Inc.
LM
| $208K | ﹤0.01% |
58
-112
| -66% | -$4.16K |
|
|
PGNX
3711
CALL
DELISTED
Progenics Pharmaceuticals Inc
PGNX
| $208K | ﹤0.01% |
410
+36
| +10% | +$190 |
|
3712
PUT
Atara Biotherapeutics
ATRA
$69.5M
| $207K | ﹤0.01% |
5
| – | – |
|
3713
CALL
Bloomin' Brands
BLMN
$731M
| $207K | ﹤0.01% |
94
+8
| +9% | +$170 |
|
3714
Enovis
ENOV
$1.63B
| $207K | ﹤0.01% |
3,313
+2,630
| +385% | +$149K |
|
3715
PUT
Enviri
NVRI
$620M
| $207K | ﹤0.01% |
90
+7
| +8% | +$146 |
|
|
ACH
3716
Accendra Health
ACH
$247M
| $207K | ﹤0.01% |
+40,084
| New | +$257K |
|
3717
PUT
Open Text
OTEX
$5.73B
| $207K | ﹤0.01% |
47
+33
| +236% | +$1.39K |
|
3718
Pinduoduo
PDD
$121B
| $207K | ﹤0.01% |
5,498
-38,949
| -88% | -$1.45M |
|
|
AIOT
3719
PowerFleet Inc
AIOT
$515M
| $207K | ﹤0.01% |
+31,864
| New | +$192K |
|
3720
Anavex Life Sciences
AVXL
$232M
| $206K | ﹤0.01% |
79,887
+19,283
| +32% | +$50.6K |
|
3721
CALL
Cameco
CCJ
$38.9B
| $206K | ﹤0.01% |
232
-2,133
| -90% | -$19.7K |
|
3722
CALL
Compass Diversified
CODI
$755M
| $206K | ﹤0.01% |
83
-24
| -22% | -$529 |
|
3723
PUT
Hyatt Hotels
H
$18B
| $206K | ﹤0.01% |
23
+22
| +2,200% | +$1.72K |
|
3724
Regency Centers
REG
$15.1B
| $206K | ﹤0.01% |
3,272
+198
| +6% | +$13K |
|
|
AAWW
3725
DELISTED
Atlas Air Worldwide Holdings, Inc.
AAWW
| $206K | ﹤0.01% |
+7,493
| New | +$187K |
|
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.