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 | |
|---|---|---|---|---|---|---|
1651
CALL
Newell Brands
NWL
$2.16B
| $1.64M | ﹤0.01% |
851
-90
| -10% | -$1.73K |
|
1652
PUT
Perrigo
PRGO
$1.4B
| $1.63M | ﹤0.01% |
316
-114
| -27% | -$5.96K |
|
1653
PUT
Zurn Elkay Water Solutions
ZWS
$8.07B
| $1.63M | ﹤0.01% |
1,038
+814
| +363% | +$11.7K |
|
|
CCMP
1654
PUT
DELISTED
CMC Materials, Inc. Common Stock
CCMP
| $1.63M | ﹤0.01% |
113
+80
| +242% | +$11.4K |
|
1655
PUT
Sociedad Química y Minera de Chile
SQM
$19.6B
| $1.63M | ﹤0.01% |
610
-218
| -26% | -$5.74K |
|
1656
PUT
Upland Software
UPLD
$12M
| $1.63M | ﹤0.01% |
46
+16
| +53% | +$5.98K |
|
|
XIFR
1657
CALL
XPLR Infrastructure LP
XIFR
$1.18B
| $1.62M | ﹤0.01% |
308
+19
| +7% | +$988 |
|
1658
PUT
Chubb
CB
$140B
| $1.62M | ﹤0.01% |
104
-432
| -81% | -$66.1K |
|
|
P
1659
CALL
Everpure Inc
P
$24.8B
| $1.62M | ﹤0.01% |
946
+427
| +82% | +$7.55K |
|
1660
PUT
Revolve Group
RVLV
$1.79B
| $1.62M | ﹤0.01% |
881
+734
| +499% | +$13.9K |
|
1661
PUT
Masco
MAS
$16B
| $1.61M | ﹤0.01% |
336
-104
| -24% | -$4.73K |
|
1662
PUT
Unilever
UL
$131B
| $1.61M | ﹤0.01% |
251
+152
| +154% | +$10.1K |
|
|
PLAN
1663
DELISTED
Anaplan, Inc.
PLAN
| $1.61M | ﹤0.01% |
30,721
+23,425
| +321% | +$1.16M |
|
1664
Arrowhead Research
ARWR
$12.1B
| $1.61M | ﹤0.01% |
25,339
-6,730
| -21% | -$334K |
|
1665
PUT
Ares Capital
ARCC
$13.5B
| $1.6M | ﹤0.01% |
861
-393
| -31% | -$7.3K |
|
1666
PUT
Adient
ADNT
$1.6B
| $1.6M | ﹤0.01% |
752
+210
| +39% | +$4.66K |
|
1667
PUT
Thomson Reuters
TRI
$39.4B
| $1.6M | ﹤0.01% |
212
+199
| +1,531% | +$14.5K |
|
|
NAV
1668
CALL
DELISTED
Navistar International
NAV
| $1.59M | ﹤0.01% |
551
+71
| +15% | +$2.18K |
|
|
GLIBA
1669
CALL
DELISTED
GCI Liberty, Inc. Class A Common Stock (DE)
GLIBA
| $1.59M | ﹤0.01% |
+225
| New | +$15.5K |
|
1670
CALL
Fox Class B
FOX
$20.7B
| $1.59M | ﹤0.01% |
430
-1,063
| -71% | -$35.7K |
|
|
SFIX
1671
CALL
Stitch Fix
SFIX
$478M
| $1.59M | ﹤0.01% |
621
-177
| -22% | -$4.11K |
|
1672
CALL
Vanguard High Dividend Yield ETF
VYM
$81.1B
| $1.59M | ﹤0.01% |
170
-90
| -35% | -$8.16K |
|
1673
Mercado Libre
MELI
$91.3B
| $1.59M | ﹤0.01% |
+2,783
| New | +$1.54M |
|
1674
TAL Education Group
TAL
$5.71B
| $1.59M | ﹤0.01% |
33,013
+23,755
| +257% | +$1.02M |
|
1675
CALL
Middleby
MIDD
$6.05B
| $1.59M | ﹤0.01% |
145
+28
| +24% | +$3.21K |
|
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.