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 | |
|---|---|---|---|---|---|---|
|
ARI
4051
PUT
Apollo Commercial Real Estate
ARI
$864M
| $151K | ﹤0.01% |
83
+62
| +295% | +$1.14K |
|
4052
PUT
Compass Diversified
CODI
$762M
| $151K | ﹤0.01% |
61
+38
| +165% | +$838 |
|
4053
ProShares Ultra Energy
DIG
$81.2M
| $151K | ﹤0.01% |
4,740
| – | – |
|
4054
ING
ING
$93.1B
| $151K | ﹤0.01% |
12,602
-47,881
| -79% | -$549K |
|
4055
CALL
Terex
TEX
$7.28B
| $151K | ﹤0.01% |
51
-68
| -57% | -$1.91K |
|
4056
Trex
TREX
$4.39B
| $151K | ﹤0.01% |
+3,368
| New | +$148K |
|
|
PENG
4057
CALL
Penguin Solutions Inc
PENG
$2.3B
| $151K | ﹤0.01% |
80
+62
| +344% | +$960 |
|
|
BGG
4058
CALL
DELISTED
Briggs & Stratton Corp.
BGG
| $151K | ﹤0.01% |
228
+199
| +686% | +$1.22K |
|
4059
CALL
Antero Resources
AR
$10.9B
| $150K | ﹤0.01% |
527
-642
| -55% | -$1.64K |
|
4060
PUT
CareDx
CDNA
$1.84B
| $150K | ﹤0.01% |
70
-102
| -59% | -$2.34K |
|
4061
CALL
Dine Brands
DIN
$457M
| $150K | ﹤0.01% |
18
-60
| -77% | -$4.66K |
|
4062
Huntington Bancshares
HBAN
$34.3B
| $150K | ﹤0.01% |
10,000
-20,633
| -67% | -$303K |
|
4063
Pediatrix Medical
MD
$2.17B
| $150K | ﹤0.01% |
+5,418
| New | +$136K |
|
4064
United Therapeutics
UTHR
$25.9B
| $150K | ﹤0.01% |
+1,707
| New | +$150K |
|
|
ABK
4065
CALL
DELISTED
Ambac Financial Group
ABK
| $150K | ﹤0.01% |
70
+66
| +1,650% | +$141K |
|
|
FIEU
4066
CALL
DELISTED
FI Enhanced Europe 50 ETN
FIEU
| $150K | ﹤0.01% |
47
-11
| -19% | -$35.1K |
|
4067
PUT
Advanced Energy
AEIS
$10.1B
| $149K | ﹤0.01% |
21
-1
| -5% | -$62 |
|
4068
PUT
AudioCodes
AUDC
$238M
| $149K | ﹤0.01% |
58
-264
| -82% | -$5.78K |
|
|
CAF
4069
Morgan Stanley China A Share Fund
CAF
$326M
| $149K | ﹤0.01% |
6,876
+1,166
| +20% | +$24.9K |
|
4070
PUT
Dover
DOV
$26.6B
| $149K | ﹤0.01% |
13
-15
| -54% | -$1.61K |
|
4071
PUT
Evercore
EVR
$11.7B
| $149K | ﹤0.01% |
20
+4
| +25% | +$305 |
|
4072
Federal Realty Investment Trust
FRT
$10.8B
| $149K | ﹤0.01% |
1,164
+768
| +194% | +$102K |
|
4073
iShares Europe ETF
IEV
$1.63B
| $149K | ﹤0.01% |
3,191
-179
| -5% | -$8.04K |
|
|
IPG
4074
DELISTED
Interpublic Group of Companies
IPG
| $149K | ﹤0.01% |
6,485
+820
| +14% | +$18K |
|
4075
Titan Machinery
TITN
$425M
| $149K | ﹤0.01% |
+10,087
| New | +$157K |
|
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.