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 | |
|---|---|---|---|---|---|---|
2551
CALL
JELD-WEN Holding
JELD
$94.8M
| $611K | ﹤0.01% |
261
+5
| +2% | +$103 |
|
2552
PUT
Howmet Aerospace
HWM
$116B
| $609K | ﹤0.01% |
258
-264
| -51% | -$5.9K |
|
2553
CALL
KKR & Co
KKR
$89.2B
| $609K | ﹤0.01% |
209
-85
| -29% | -$2.42K |
|
|
SEE
2554
CALL
DELISTED
Sealed Air
SEE
| $609K | ﹤0.01% |
153
-449
| -75% | -$17.8K |
|
2555
Tronox
TROX
$995M
| $608K | ﹤0.01% |
53,277
+31,756
| +148% | +$317K |
|
2556
CALL
Antero Midstream
AM
$10.8B
| $607K | ﹤0.01% |
800
+348
| +77% | +$2.2K |
|
2557
CALL
Acuity Brands
AYI
$9.88B
| $607K | ﹤0.01% |
44
-236
| -84% | -$30.3K |
|
2558
KB Home
KBH
$3.48B
| $607K | ﹤0.01% |
17,731
-3,732
| -17% | -$129K |
|
2559
PUT
Edgewell Personal Care
EPC
$1.27B
| $606K | ﹤0.01% |
196
+191
| +3,820% | +$6.16K |
|
2560
CALL
Impinj
PI
$3.89B
| $605K | ﹤0.01% |
234
+90
| +63% | +$2.8K |
|
2561
PUT
Sunoco
SUN
$14.2B
| $605K | ﹤0.01% |
198
-23
| -10% | -$725 |
|
|
XENT
2562
CALL
DELISTED
Intersect ENT, Inc
XENT
| $605K | ﹤0.01% |
243
+70
| +40% | +$1.42K |
|
|
2563
KKR & Co
KKR
$89.2B
| $603K | ﹤0.01% |
+20,695
| New | +$589K |
|
|
2564
PUT
KKR & Co
KKR
$89.2B
| $603K | ﹤0.01% |
207
-9
| -4% | -$256 |
|
2565
Yelp
YELP
$1.38B
| $603K | ﹤0.01% |
17,317
+5,760
| +50% | +$195K |
|
2566
CALL
Lithia Motors
LAD
$7.78B
| $602K | ﹤0.01% |
41
+31
| +310% | +$4.66K |
|
2567
PUT
Clarivate
CLVT
$1.3B
| $601K | ﹤0.01% |
+358
| New | +$6.03K |
|
2568
PUT
DaVita
DVA
$15.1B
| $600K | ﹤0.01% |
80
-390
| -83% | -$25.9K |
|
2569
Extra Space Storage
EXR
$31.2B
| $599K | ﹤0.01% |
5,679
-2,340
| -29% | -$255K |
|
|
CZR
2570
PUT
DELISTED
Caesars Entertainment Corporation
CZR
| $599K | ﹤0.01% |
441
-75
| -15% | -$950 |
|
2571
PUT
USA Compression Partners
USAC
$3.82B
| $598K | ﹤0.01% |
330
+98
| +42% | +$1.67K |
|
2572
Five Below
FIVE
$11.2B
| $597K | ﹤0.01% |
+4,672
| New | +$585K |
|
|
PE
2573
PUT
DELISTED
PARSLEY ENERGY INC
PE
| $597K | ﹤0.01% |
316
+156
| +98% | +$2.58K |
|
|
GREK
2574
Global X MSCI Greece ETF
GREK
$288M
| $596K | ﹤0.01% |
19,633
+5,912
| +43% | +$172K |
|
|
DCH
2575
CALL
Dauch Corp
DCH
$1.3B
| $595K | ﹤0.01% |
553
-78
| -12% | -$742 |
|
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.