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 | |
|---|---|---|---|---|---|---|
651
PUT
XPO
XPO
$24.9B
| $6.45M | 0.01% |
2,339
-651
| -22% | -$17.9K |
|
|
TYNS
652
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $6.42M | 0.01% |
802
+199
| +33% | +$5.16K |
|
653
Marathon Petroleum
MPC
$93.5B
| $6.42M | 0.01% |
+106,618
| New | +$6.67M |
|
|
MLNX
654
PUT
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $6.41M | 0.01% |
547
-142
| -21% | -$16.1K |
|
655
CALL
Carnival Corporation Ltd
CCL
$34.8B
| $6.4M | 0.01% |
1,259
-469
| -27% | -$21K |
|
656
PUT
Idexx Laboratories
IDXX
$42.6B
| $6.4M | 0.01% |
245
+100
| +69% | +$26.4K |
|
|
ZEN
657
PUT
DELISTED
ZENDESK INC
ZEN
| $6.37M | 0.01% |
831
+420
| +102% | +$30.8K |
|
658
CALL
Equity Residential
EQR
$25.7B
| $6.35M | 0.01% |
785
+308
| +65% | +$26.2K |
|
659
PUT
State Street
STT
$50.8B
| $6.34M | 0.01% |
802
+303
| +61% | +$21.3K |
|
660
CALL
WEX
WEX
$5.62B
| $6.33M | 0.01% |
302
+183
| +154% | +$36.7K |
|
661
CALL
McKesson
MCK
$95.5B
| $6.32M | 0.01% |
457
+159
| +53% | +$22.5K |
|
662
CALL
Colgate-Palmolive
CL
$71.9B
| $6.31M | 0.01% |
917
+60
| +7% | +$4.09K |
|
663
PUT
Incyte
INCY
$23.3B
| $6.3M | 0.01% |
722
+81
| +13% | +$6.92K |
|
664
PUT
NovoCure
NVCR
$2.26B
| $6.3M | 0.01% |
748
+333
| +80% | +$26.9K |
|
665
CALL
HP
HPQ
$22.9B
| $6.27M | 0.01% |
3,051
+793
| +35% | +$15K |
|
666
PUT
Digital Realty Trust
DLR
$67B
| $6.26M | 0.01% |
523
+457
| +692% | +$56.2K |
|
667
PUT
Ambarella
AMBA
$2.97B
| $6.26M | 0.01% |
1,034
+137
| +15% | +$7.59K |
|
668
PUT
Harley-Davidson
HOG
$2.81B
| $6.25M | 0.01% |
1,681
+436
| +35% | +$16.2K |
|
669
PUT
Williams Companies
WMB
$92B
| $6.23M | 0.01% |
2,628
-22
| -0.8% | -$504 |
|
670
CALL
ResMed
RMD
$27.8B
| $6.23M | 0.01% |
402
-34
| -8% | -$4.9K |
|
671
PUT
Macy's
M
$6.12B
| $6.21M | 0.01% |
3,652
+951
| +35% | +$14.9K |
|
|
B
672
PUT
Barrick Mining
B
$62B
| $6.2M | 0.01% |
3,333
-5,679
| -63% | -$97.5K |
|
673
CALL
Campbell Soup
CPB
$6.44B
| $6.18M | 0.01% |
1,250
+156
| +14% | +$7.4K |
|
|
VMW
674
CALL
DELISTED
VMware, Inc
VMW
| $6.18M | 0.01% |
407
-179
| -31% | -$28.1K |
|
675
CALL
Dominion Energy
D
$62.8B
| $6.14M | 0.01% |
742
+145
| +24% | +$11.8K |
|
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.