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 | |
|---|---|---|---|---|---|---|
|
LSI
726
PUT
DELISTED
Life Storage, Inc.
LSI
| $5.62M | 0.01% |
779
-216
| -22% | -$15.4K |
|
|
ICPT
727
CALL
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $5.61M | 0.01% |
453
+80
| +21% | +$7.16K |
|
728
PUT
Aflac
AFL
$63.2B
| $5.61M | 0.01% |
1,061
+667
| +169% | +$35.4K |
|
729
CALL
Exelon
EXC
$48.3B
| $5.61M | 0.01% |
1,724
+701
| +69% | +$22.7K |
|
730
CALL
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.06B
| $5.61M | 0.01% |
513
+302
| +143% | +$9.06K |
|
731
PUT
Mohawk Industries
MHK
$6.67B
| $5.61M | 0.01% |
411
+130
| +46% | +$17.7K |
|
732
PUT
NewMarket
NEU
$6.97B
| $5.59M | 0.01% |
+115
| New | +$55.3K |
|
733
Baidu
BIDU
$36.3B
| $5.58M | 0.01% |
44,166
+40,312
| +1,046% | +$4.58M |
|
734
PUT
MGM Resorts International
MGM
$11.5B
| $5.57M | 0.01% |
1,674
-929
| -36% | -$28.3K |
|
735
CALL
Alnylam Pharmaceuticals
ALNY
$35.8B
| $5.56M | 0.01% |
483
-32
| -6% | -$3.19K |
|
736
PUT
Kroger
KR
$34.2B
| $5.55M | 0.01% |
1,916
-1,576
| -45% | -$41.8K |
|
737
CALL
Dell
DELL
$282B
| $5.53M | 0.01% |
2,123
-2,079
| -49% | -$54.1K |
|
738
ProShares Short VIX Short-Term Futures ETF
SVXY
$216M
| $5.52M | 0.01% |
169,214
-83,530
| -33% | -$2.49M |
|
739
CALL
Hilton Worldwide
HLT
$72.5B
| $5.51M | 0.01% |
497
-201
| -29% | -$20.2K |
|
740
CALL
Rio Tinto
RIO
$149B
| $5.51M | 0.01% |
928
-520
| -36% | -$28.2K |
|
741
PUT
CoStar Group
CSGP
$11B
| $5.5M | 0.01% |
920
-40
| -4% | -$2.33K |
|
|
STMP
742
PUT
DELISTED
Stamps.com, Inc.
STMP
| $5.5M | 0.01% |
658
+39
| +6% | +$3.25K |
|
743
CALL
Equinix
EQIX
$102B
| $5.49M | 0.01% |
94
+46
| +96% | +$25.8K |
|
744
PUT
Assured Guaranty
AGO
$3.73B
| $5.47M | 0.01% |
1,117
-86
| -7% | -$4.11K |
|
745
PUT
Bausch Health
BHC
$1.67B
| $5.47M | 0.01% |
1,828
-37
| -2% | -$962 |
|
746
Shopify
SHOP
$146B
| $5.46M | 0.01% |
+137,390
| New | +$4.65M |
|
747
CALL
Seagate
STX
$208B
| $5.46M | 0.01% |
918
-996
| -52% | -$57.2K |
|
748
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $5.46M | 0.01% |
624
+357
| +134% | +$31.2K |
|
|
DOCU
749
PUT
DocuSign
DOCU
$9B
| $5.45M | 0.01% |
736
+271
| +58% | +$18.6K |
|
750
Ulta Beauty
ULTA
$20.6B
| $5.45M | 0.01% |
21,542
-2,806
| -12% | -$686K |
|
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.