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 | |
|---|---|---|---|---|---|---|
526
PUT
BioNTech
BNTX
$26.1B
| $15.9M | 0.02% |
71,200
+70,844
| +19,900% | +$13.4M |
|
527
CALL
GE Aerospace
GE
$350B
| $15.9M | 0.02% |
237,333
+234,860
| +9,497% | +$15.7M |
|
528
Beyond Meat
BYND
$203M
| $15.9M | 0.02% |
3,357
+1,935
| +136% | +$7.72M |
|
529
PUT
Cummins
CMI
$77.2B
| $15.8M | 0.02% |
65,000
+64,594
| +15,910% | +$16.5M |
|
530
PUT
Occidental Petroleum
OXY
$60B
| $15.8M | 0.02% |
528,200
+524,394
| +13,778% | +$14.1M |
|
531
CALL
Li Auto
LI
$12.1B
| $15.7M | 0.02% |
448,700
+446,047
| +16,813% | +$10.4M |
|
532
PUT
Domino's
DPZ
$11.3B
| $15.7M | 0.02% |
+33,600
| New | +$14.2M |
|
533
CALL
Thermo Fisher Scientific
TMO
$227B
| $15.6M | 0.02% |
31,000
+30,571
| +7,126% | +$14.4M |
|
534
CALL
QuantumScape Corp
QS
$3.37B
| $15.6M | 0.02% |
534,100
+522,134
| +4,363% | +$16.9M |
|
535
PUT
US Bancorp Series B Preferred Stock
USB.PRH
$727M
| $15.6M | 0.02% |
+273,800
| New | +$6.73M |
|
536
CALL
Prudential Financial
PRU
$42.1B
| $15.5M | 0.02% |
151,100
+148,938
| +6,889% | +$15.2M |
|
537
CALL
TAL Education Group
TAL
$6.88B
| $15.5M | 0.02% |
613,700
+613,381
| +192,282% | +$27.4M |
|
538
CALL
BHP
BHP
$230B
| $15.5M | 0.01% |
237,988
+236,144
| +12,806% | +$15.6M |
|
539
PUT
SoFi Technologies
SOFI
$23.5B
| $15.4M | 0.01% |
804,200
+802,328
| +42,859% | +$14.9M |
|
540
CALL
Lemonade
LMND
$4.13B
| $15.4M | 0.01% |
140,800
+139,772
| +13,596% | +$12.7M |
|
|
TYNS
541
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $15.4M | 0.01% |
140,900
+137,528
| +4,079% | +$15M |
|
542
CALL
Philip Morris
PM
$284B
| $15.3M | 0.01% |
154,700
+153,210
| +10,283% | +$14.7M |
|
543
CALL
Humana
HUM
$48.2B
| $15.2M | 0.01% |
34,400
+34,267
| +25,765% | +$15M |
|
544
Mastercard
MA
$507B
| $15.2M | 0.01% |
41,527
-29,867
| -42% | -$11.1M |
|
545
CALL
Lennar Class B
LEN.B
$19.8B
| $15.1M | 0.01% |
160,325
+159,520
| +19,816% | +$12.1M |
|
546
CALL
TripAdvisor
TRIP
$1.09B
| $15.1M | 0.01% |
375,300
+371,493
| +9,758% | +$16.8M |
|
547
PUT
iQIYI
IQ
$849M
| $15.1M | 0.01% |
969,400
+962,413
| +13,774% | +$14.3M |
|
548
Trade Desk
TTD
$6.78B
| $15.1M | 0.01% |
194,798
+40,408
| +26% | +$2.58M |
|
549
PUT
Atlassian
TEAM
$48B
| $15.1M | 0.01% |
+58,600
| New | +$13.7M |
|
550
PUT
Valero Energy
VLO
$107B
| $15M | 0.01% |
192,400
+190,969
| +13,345% | +$14.8M |
|
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.