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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 97.7% |
| 2 | Technology | 0.48% |
| 3 | Consumer Discretionary | 0.39% |
| 4 | Communication Services | 0.28% |
| 5 | Healthcare | 0.27% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
576
PUT
T-Mobile US
TMUS
$195B
| $13.9M | 0.01% |
+95,700
| New | +$13.2M |
|
577
Coinbase
COIN
$48.7B
| $13.8M | 0.01% |
+54,603
| New | +$14.2M |
|
578
CALL
Teledyne Technologies
TDY
$28.3B
| $13.8M | 0.01% |
32,900
+32,896
| +822,400% | +$14M |
|
579
CALL
Vipshop
VIPS
$6.28B
| $13.8M | 0.01% |
686,200
+682,845
| +20,353% | +$17.2M |
|
580
CALL
Akamai
AKAM
$15.1B
| $13.7M | 0.01% |
+117,700
| New | +$13.1M |
|
581
CALL
CRISPR Therapeutics
CRSP
$5.39B
| $13.7M | 0.01% |
84,700
+83,844
| +9,795% | +$10.2M |
|
582
PUT
Tyson Foods
TSN
$18.1B
| $13.7M | 0.01% |
185,400
+183,735
| +11,035% | +$14.3M |
|
583
Procter & Gamble
PG
$340B
| $13.6M | 0.01% |
+100,695
| New | +$13.6M |
|
584
S&P Global
SPGI
$131B
| $13.6M | 0.01% |
33,066
+28,326
| +598% | +$10.9M |
|
|
EXAS
585
CALL
DELISTED
Exact Sciences
EXAS
| $13.5M | 0.01% |
108,900
+108,066
| +12,958% | +$12.9M |
|
586
CALL
Alcoa
AA
$13.2B
| $13.5M | 0.01% |
367,400
+363,590
| +9,543% | +$13.2M |
|
587
Alibaba
BABA
$281B
| $13.5M | 0.01% |
59,644
+17,159
| +40% | +$3.81M |
|
588
CALL
Logitech
LOGI
$14.6B
| $13.5M | 0.01% |
+111,500
| New | +$13M |
|
589
PUT
Workhorse Group
WKHS
$33.8M
| $13.5M | 0.01% |
270
+268
| +13,400% | +$9.92M |
|
590
CALL
Generac Holdings
GNRC
$11.1B
| $13.4M | 0.01% |
32,400
+32,204
| +16,431% | +$10.8M |
|
591
PUT
Sherwin-Williams
SHW
$81B
| $13.3M | 0.01% |
48,800
+48,251
| +8,789% | +$13.2M |
|
592
PUT
Clover Health Investments
CLOV
$2.26B
| $13.3M | 0.01% |
996,500
+993,664
| +35,038% | +$9.76M |
|
593
CALL
ArcelorMittal
MT
$59.4B
| $13.3M | 0.01% |
427,000
+424,299
| +15,709% | +$13.1M |
|
594
CALL
Okta
OKTA
$29.8B
| $13.2M | 0.01% |
+54,100
| New | +$13.1M |
|
595
PUT
Under Armour Class C
UA
$2.2B
| $13.2M | 0.01% |
655,700
+650,653
| +12,892% | +$12.3M |
|
596
CALL
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$111M
| $13.2M | 0.01% |
326,025
+321,914
| +7,831% | +$9.33M |
|
|
B
597
CALL
Barrick Mining
B
$73.7B
| $13.2M | 0.01% |
+638,400
| New | +$14.4M |
|
598
PUT
Lennar Class B
LEN.B
$19.8B
| $13.1M | 0.01% |
138,864
+136,474
| +5,710% | +$10.3M |
|
599
CALL
Advance Auto Parts
AAP
$2.67B
| $13.1M | 0.01% |
+63,900
| New | +$12.5M |
|
|
SIVB
600
PUT
DELISTED
SVB Financial Group
SIVB
| $13.1M | 0.01% |
23,500
+23,252
| +9,376% | +$12.9M |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading's Q2 2021 filing shows 2,248 new, 6,668 increased, 1,000 reduced and 1,196 closed positions. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M. The largest sale was Invesco QQQ Trust, an estimated $36.1M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 97% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,248 new positions and closed 1,196 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.