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 | |
|---|---|---|---|---|---|---|
926
CALL
Chewy
CHWY
$8.38B
| $4.12M | 0.01% |
1,419
+732
| +107% | +$18.7K |
|
927
CALL
Ambarella
AMBA
$3.09B
| $4.11M | 0.01% |
679
+123
| +22% | +$6.81K |
|
928
PUT
Toyota
TM
$209B
| $4.1M | 0.01% |
292
+103
| +54% | +$14.4K |
|
|
X
929
CALL
DELISTED
US Steel
X
| $4.1M | 0.01% |
3,590
+843
| +31% | +$10.5K |
|
930
PUT
Guardant Health
GH
$19.9B
| $4.09M | 0.01% |
524
+209
| +66% | +$15.1K |
|
|
NBIS
931
PUT
Nebius Group N.V.
NBIS
$56.1B
| $4.09M | 0.01% |
941
-122
| -11% | -$4.55K |
|
932
Honeywell
HON
$78B
| $4.08M | 0.01% |
24,467
+18,680
| +323% | +$3.05M |
|
933
CALL
PACCAR
PCAR
$68.8B
| $4.08M | 0.01% |
774
+631
| +441% | +$32.5K |
|
934
CALL
CarMax
KMX
$8.29B
| $4.08M | 0.01% |
465
-258
| -36% | -$24.3K |
|
935
CALL
STMicroelectronics
STM
$47.7B
| $4.08M | 0.01% |
1,515
+431
| +40% | +$10.2K |
|
936
PUT
Mattel
MAT
$4.14B
| $4.08M | 0.01% |
3,008
+1,203
| +67% | +$14.3K |
|
937
PUT
VF Corp
VFC
$6.49B
| $4.07M | 0.01% |
409
+111
| +37% | +$9.95K |
|
938
CALL
Fortive
FTV
$18.5B
| $4.06M | 0.01% |
844
+207
| +32% | +$9.35K |
|
939
PUT
EPR Properties
EPR
$4.74B
| $4.05M | 0.01% |
574
+514
| +857% | +$37.9K |
|
940
PUT
Tractor Supply
TSCO
$15.9B
| $4.04M | 0.01% |
2,165
+305
| +16% | +$5.79K |
|
941
PUT
Viatris
VTRS
$20.1B
| $4.04M | 0.01% |
2,011
+53
| +3% | +$986 |
|
942
CALL
LKQ Corp
LKQ
$6.32B
| $4.02M | 0.01% |
1,127
+532
| +89% | +$18.1K |
|
943
CALL
National Health Investors
NHI
$3.88B
| $4.02M | 0.01% |
493
+484
| +5,378% | +$39.6K |
|
944
PUT
Post Holdings
POST
$4.09B
| $4.01M | 0.01% |
562
-605
| -52% | -$41.4K |
|
|
PPLI
945
PUT
People Inc
PPLI
$3.14B
| $4.01M | 0.01% |
901
-520
| -37% | -$21K |
|
|
BLD
946
PUT
DELISTED
TopBuild
BLD
| $4M | 0.01% |
388
-113
| -23% | -$11.8K |
|
947
CALL
Equifax
EFX
$19.6B
| $3.99M | 0.01% |
285
-173
| -38% | -$24K |
|
948
PUT
Truist Financial
TFC
$62.5B
| $3.99M | 0.01% |
709
-303
| -30% | -$16.4K |
|
|
WORK
949
CALL
DELISTED
Slack Technologies, Inc.
WORK
| $3.98M | 0.01% |
1,770
+815
| +85% | +$18.1K |
|
950
PUT
BioMarin Pharmaceuticals
BMRN
$11.4B
| $3.96M | 0.01% |
469
+308
| +191% | +$23.3K |
|
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.