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 | Miscellaneous | 97.26% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.58% |
| 4 | Communication Services | 0.34% |
| 5 | Healthcare | 0.32% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1701
PUT
United Therapeutics
UTHR
$21.4B
| $1.56M | ﹤0.01% |
177
+67
| +61% | +$5.9K |
|
|
CBPO
1702
CALL
DELISTED
China Biologic Products Holdings, Inc.
CBPO
| $1.56M | ﹤0.01% |
134
-117
| -47% | -$13.6K |
|
1703
CALL
Aramark
ARMK
$15.2B
| $1.56M | ﹤0.01% |
497
-46
| -8% | -$1.44K |
|
1704
CALL
Factset
FDS
$10.3B
| $1.56M | ﹤0.01% |
58
-53
| -48% | -$13.6K |
|
|
ARQL
1705
CALL
DELISTED
Arqule Inc
ARQL
| $1.56M | ﹤0.01% |
780
+442
| +131% | +$5.13K |
|
|
UCTT
1706
PUT
Ultra Clean Holdings
UCTT
$3.39B
| $1.55M | ﹤0.01% |
662
+37
| +6% | +$748 |
|
1707
CALL
Yelp
YELP
$1.14B
| $1.55M | ﹤0.01% |
446
-365
| -45% | -$12.4K |
|
|
LCI
1708
PUT
DELISTED
Lannett Company, Inc.
LCI
| $1.55M | ﹤0.01% |
440
+133
| +43% | +$5.41K |
|
|
BPY
1709
CALL
DELISTED
Brookfield Property Partners L.P. Limited Partnership Units
BPY
| $1.55M | ﹤0.01% |
850
+430
| +102% | +$8.13K |
|
1710
CALL
Northern Trust
NTRS
$34.1B
| $1.55M | ﹤0.01% |
146
-161
| -52% | -$16.5K |
|
|
WCG
1711
CALL
DELISTED
Wellcare Health Plans, Inc.
WCG
| $1.55M | ﹤0.01% |
47
-113
| -71% | -$33.9K |
|
1712
PUT
Lear
LEA
$6.42B
| $1.55M | ﹤0.01% |
113
-100
| -47% | -$12.4K |
|
1713
CALL
Weyerhaeuser
WY
$16.4B
| $1.55M | ﹤0.01% |
513
+148
| +41% | +$4.29K |
|
1714
PUT
InterDigital
IDCC
$8.81B
| $1.55M | ﹤0.01% |
284
-54
| -16% | -$2.98K |
|
1715
PUT
PagSeguro Digital
PAGS
$2.69B
| $1.55M | ﹤0.01% |
453
+174
| +62% | +$6.26K |
|
1716
PUT
Semtech
SMTC
$15B
| $1.54M | ﹤0.01% |
292
-167
| -36% | -$8.37K |
|
1717
CALL
Teradata
TDC
$2.59B
| $1.54M | ﹤0.01% |
577
+1
| +0.2% | +$28 |
|
1718
PUT
Cooper Companies
COO
$13.3B
| $1.54M | ﹤0.01% |
192
-4
| -2% | -$302 |
|
|
NBLX
1719
CALL
DELISTED
Noble Midstream Partners LP
NBLX
| $1.54M | ﹤0.01% |
580
-103
| -15% | -$2.44K |
|
|
DERM
1720
DELISTED
Dermira, Inc.
DERM
| $1.54M | ﹤0.01% |
101,387
+96,182
| +1,848% | +$830K |
|
1721
CALL
Datadog
DDOG
$74.7B
| $1.53M | ﹤0.01% |
+406
| New | +$14.6K |
|
1722
PUT
Baxter International
BAX
$12.8B
| $1.53M | ﹤0.01% |
183
+178
| +3,560% | +$14.7K |
|
1723
CALL
Helen of Troy
HELE
$659M
| $1.53M | ﹤0.01% |
85
+55
| +183% | +$8.82K |
|
|
1724
Teradata
TDC
$2.59B
| $1.53M | ﹤0.01% |
+57,042
| New | +$1.59M |
|
1725
CALL
Celanese
CE
$4.89B
| $1.53M | ﹤0.01% |
124
+2
| +2% | +$246 |
|
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 Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.