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 | |
|---|---|---|---|---|---|---|
1401
CALL
Urban Outfitters
URBN
$5.99B
| $2.18M | ﹤0.01% |
786
+133
| +20% | +$3.7K |
|
1402
PUT
Martin Marietta Materials
MLM
$33.6B
| $2.18M | ﹤0.01% |
78
-108
| -58% | -$28.8K |
|
1403
CALL
Tandem Diabetes Care
TNDM
$1.17B
| $2.18M | ﹤0.01% |
366
-353
| -49% | -$21.8K |
|
1404
CALL
Nexstar Media Group
NXST
$5.6B
| $2.18M | ﹤0.01% |
186
+37
| +25% | +$3.87K |
|
1405
American Tower
AMT
$77.7B
| $2.17M | ﹤0.01% |
9,456
-13,793
| -59% | -$3M |
|
1406
PUT
Citizens Financial Group
CFG
$30.4B
| $2.17M | ﹤0.01% |
534
+33
| +7% | +$1.24K |
|
|
BRSL
1407
CALL
Brightstar Lottery PLC
BRSL
$1.91B
| $2.17M | ﹤0.01% |
1,448
+105
| +8% | +$1.5K |
|
1408
CALL
W.W. Grainger
GWW
$65.3B
| $2.17M | ﹤0.01% |
64
-51
| -44% | -$16.2K |
|
1409
CALL
Sabre
SABR
$656M
| $2.17M | ﹤0.01% |
965
+761
| +373% | +$16.9K |
|
1410
CALL
Quest Diagnostics
DGX
$25.1B
| $2.16M | ﹤0.01% |
202
-73
| -27% | -$7.61K |
|
1411
PUT
Visteon
VC
$2.77B
| $2.16M | ﹤0.01% |
249
+121
| +95% | +$10.8K |
|
|
BKI
1412
PUT
DELISTED
Black Knight, Inc. Common Stock
BKI
| $2.15M | ﹤0.01% |
334
-46
| -12% | -$2.85K |
|
1413
CALL
Murphy USA
MUSA
$11.3B
| $2.15M | ﹤0.01% |
184
+169
| +1,127% | +$18.2K |
|
1414
PUT
Grocery Outlet
GO
$891M
| $2.15M | ﹤0.01% |
663
+616
| +1,311% | +$19.8K |
|
1415
PUT
Becton Dickinson
BDX
$43.1B
| $2.15M | ﹤0.01% |
81
+2
| +3% | +$499 |
|
1416
CALL
Vistra
VST
$55.1B
| $2.15M | ﹤0.01% |
934
+727
| +351% | +$18.8K |
|
1417
CALL
Thor Industries
THO
$3.99B
| $2.14M | ﹤0.01% |
288
-128
| -31% | -$8.26K |
|
|
BITA
1418
PUT
DELISTED
Bitauto Holdings Limited
BITA
| $2.14M | ﹤0.01% |
1,442
-833
| -37% | -$12.6K |
|
1419
PUT
Safety Insurance
SAFT
$1.52B
| $2.14M | ﹤0.01% |
231
+188
| +437% | +$18.3K |
|
1420
CALL
Itaú Unibanco
ITUB
$91.3B
| $2.14M | ﹤0.01% |
3,209
+1,182
| +58% | +$7.41K |
|
|
TWOU
1421
PUT
DELISTED
2U Inc
TWOU
| $2.13M | ﹤0.01% |
30
+13
| +76% | +$8.09K |
|
1422
PUT
Wheaton Precious Metals
WPM
$50.6B
| $2.13M | ﹤0.01% |
717
-189
| -21% | -$5.17K |
|
1423
CALL
ArcelorMittal
MT
$50.4B
| $2.13M | ﹤0.01% |
1,216
-304
| -20% | -$4.93K |
|
|
I
1424
PUT
DELISTED
INTELSAT S. A.
I
| $2.13M | ﹤0.01% |
3,032
+912
| +43% | +$14.3K |
|
1425
iShares MSCI ACWI ETF
ACWI
$32.6B
| $2.13M | ﹤0.01% |
26,881
+15,684
| +140% | +$1.2M |
|
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.