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 | |
|---|---|---|---|---|---|---|
|
SAGE
626
CALL
DELISTED
Sage Therapeutics
SAGE
| $6.85M | 0.02% |
949
+806
| +564% | +$99.2K |
|
627
PUT
Dell
DELL
$285B
| $6.84M | 0.01% |
2,626
-349
| -12% | -$9.08K |
|
628
CALL
International Paper
IP
$20.2B
| $6.8M | 0.01% |
1,560
+617
| +65% | +$25.9K |
|
629
CALL
CSX Corp
CSX
$92.8B
| $6.77M | 0.01% |
2,808
-1,062
| -27% | -$25.1K |
|
630
CALL
iShares Convertible Bond ETF
ICVT
$7.4B
| $6.7M | 0.01% |
1,958
+251
| +15% | +$15.1K |
|
631
PUT
LyondellBasell Industries
LYB
$20.1B
| $6.68M | 0.01% |
707
-295
| -29% | -$27K |
|
632
PUT
Stryker
SYK
$119B
| $6.68M | 0.01% |
318
+142
| +81% | +$29.5K |
|
633
PUT
Sun Communities
SUI
$14.7B
| $6.66M | 0.01% |
444
+294
| +196% | +$45.8K |
|
634
CALL
Ferrari
RACE
$65.4B
| $6.64M | 0.01% |
401
+114
| +40% | +$18.4K |
|
635
PUT
Cheniere Energy
LNG
$56B
| $6.63M | 0.01% |
1,086
-71
| -6% | -$4.37K |
|
636
CALL
eBay
EBAY
$49.3B
| $6.62M | 0.01% |
1,832
-1,707
| -48% | -$61.8K |
|
637
PUT
Carvana
CVNA
$44.9B
| $6.59M | 0.01% |
3,580
+690
| +24% | +$11.5K |
|
638
PUT
The GEO Group
GEO
$4.19B
| $6.58M | 0.01% |
3,964
+2,290
| +137% | +$34.8K |
|
639
CALL
Lennar Class B
LEN.B
$19.4B
| $6.58M | 0.01% |
1,240
+228
| +23% | +$10.1K |
|
640
PUT
International Flavors & Fragrances
IFF
$19.7B
| $6.57M | 0.01% |
509
+257
| +102% | +$32.8K |
|
641
PUT
Peloton Interactive
PTON
$2.71B
| $6.55M | 0.01% |
+2,308
| New | +$62.2K |
|
642
CALL
Verisk Analytics
VRSK
$25.2B
| $6.51M | 0.01% |
436
-19
| -4% | -$2.81K |
|
643
CALL
Macy's
M
$6.4B
| $6.5M | 0.01% |
3,824
+2,592
| +210% | +$40.6K |
|
644
PUT
American International
AIG
$41.5B
| $6.49M | 0.01% |
1,264
+440
| +53% | +$23.3K |
|
|
IMMU
645
CALL
DELISTED
Immunomedics Inc
IMMU
| $6.48M | 0.01% |
3,064
+1,036
| +51% | +$18.3K |
|
|
SGEN
646
PUT
DELISTED
Seagen Inc. Common Stock
SGEN
| $6.48M | 0.01% |
567
+366
| +182% | +$38.8K |
|
647
CALL
General Mills
GIS
$19.7B
| $6.47M | 0.01% |
1,208
-1,016
| -46% | -$53.5K |
|
648
PUT
TAL Education Group
TAL
$5.73B
| $6.47M | 0.01% |
1,342
+464
| +53% | +$19.9K |
|
649
CALL
Molina Healthcare
MOH
$11.6B
| $6.46M | 0.01% |
476
+391
| +460% | +$49.3K |
|
650
PUT
Shake Shack
SHAK
$2.26B
| $6.45M | 0.01% |
1,083
+673
| +164% | +$48.4K |
|
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.