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 | |
|---|---|---|---|---|---|---|
1226
CALL
AGNC Investment
AGNC
$12.4B
| $2.71M | 0.01% |
1,536
-1,654
| -52% | -$28.1K |
|
1227
CALL
Agios Pharmaceuticals
AGIO
$2.14B
| $2.71M | 0.01% |
568
+513
| +933% | +$19.4K |
|
1228
PUT
Vail Resorts
MTN
$5.29B
| $2.71M | 0.01% |
113
-51
| -31% | -$12.1K |
|
1229
CALL
RenaissanceRe
RNR
$13.6B
| $2.71M | 0.01% |
138
-36
| -21% | -$6.82K |
|
|
BERY
1230
CALL
DELISTED
Berry Global Group, Inc.
BERY
| $2.7M | 0.01% |
620
-116
| -16% | -$4.6K |
|
1231
CALL
Murphy Oil
MUR
$5.56B
| $2.7M | 0.01% |
1,008
+814
| +420% | +$18.7K |
|
1232
PUT
LendingTree
TREE
$560M
| $2.7M | 0.01% |
89
+49
| +123% | +$16.2K |
|
1233
CALL
Wyndham Hotels & Resorts
WH
$5.58B
| $2.7M | 0.01% |
430
+377
| +711% | +$20.9K |
|
1234
Booking.com
BKNG
$139B
| $2.69M | 0.01% |
32,775
-105,850
| -76% | -$8.31M |
|
1235
PUT
HDFC Bank
HDB
$121B
| $2.69M | 0.01% |
850
+86
| +11% | +$2.62K |
|
|
ALXN
1236
DELISTED
Alexion Pharmaceuticals
ALXN
| $2.69M | 0.01% |
24,879
-31,018
| -55% | -$3.32M |
|
1237
PUT
Xerox
XRX
$339M
| $2.69M | 0.01% |
729
+455
| +166% | +$15.9K |
|
1238
CALL
Boyd Gaming
BYD
$6.42B
| $2.68M | 0.01% |
896
+558
| +165% | +$15.7K |
|
1239
PUT
Kimberly-Clark
KMB
$36.3B
| $2.68M | 0.01% |
195
-373
| -66% | -$50.5K |
|
1240
CALL
Rithm Capital
RITM
$5.11B
| $2.68M | 0.01% |
1,665
+820
| +97% | +$12.9K |
|
1241
CALL
Ashland
ASH
$3.1B
| $2.68M | 0.01% |
350
-94
| -21% | -$7.13K |
|
1242
CALL
Essex Property Trust
ESS
$18.9B
| $2.68M | 0.01% |
89
+61
| +218% | +$19.3K |
|
1243
CALL
Canadian Pacific Kansas City
CP
$81.9B
| $2.68M | 0.01% |
525
+475
| +950% | +$22.3K |
|
1244
CALL
Halozyme
HALO
$9.68B
| $2.67M | 0.01% |
1,506
+1,146
| +318% | +$19.8K |
|
|
WORK
1245
PUT
DELISTED
Slack Technologies, Inc.
WORK
| $2.67M | 0.01% |
1,186
+115
| +11% | +$2.56K |
|
1246
PUT
Celanese
CE
$5.17B
| $2.66M | 0.01% |
216
+10
| +5% | +$1.23K |
|
1247
PUT
Middleby
MIDD
$6.09B
| $2.65M | 0.01% |
242
+198
| +450% | +$22.7K |
|
1248
PUT
GrafTech
EAF
$200M
| $2.65M | 0.01% |
228
+205
| +891% | +$25.8K |
|
1249
CALL
Children's Place
PLCE
$56M
| $2.64M | 0.01% |
423
+322
| +319% | +$23.5K |
|
1250
PUT
Quest Diagnostics
DGX
$25.1B
| $2.64M | 0.01% |
247
-73
| -23% | -$7.61K |
|
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.