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 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2401
PUT
PetMed Express
PETS
$42.5M
| $1.68M | ﹤0.01% |
52,800
+52,471
| +15,949% | +$1.67M |
|
2402
CALL
Sibanye-Stillwater
SBSW
$5.92B
| $1.68M | ﹤0.01% |
100,500
+99,136
| +7,268% | +$1.84M |
|
2403
Vail Resorts
MTN
$5.19B
| $1.68M | ﹤0.01% |
5,306
+2,371
| +81% | +$756K |
|
2404
Planet Fitness
PLNT
$4.23B
| $1.68M | ﹤0.01% |
22,306
+11,798
| +112% | +$939K |
|
2405
AdvisorShares Pure US Cannabis ETF
MSOS
$864M
| $1.68M | ﹤0.01% |
41,890
-32,986
| -44% | -$1.34M |
|
2406
CALL
National Grid
NGG
$82.7B
| $1.68M | ﹤0.01% |
29,626
+29,017
| +4,765% | +$1.65M |
|
2407
PUT
Methanex
MEOH
$4.32B
| $1.67M | ﹤0.01% |
50,600
+50,003
| +8,376% | +$1.84M |
|
2408
Prudential Financial
PRU
$41.7B
| $1.67M | ﹤0.01% |
+16,327
| New | +$1.67M |
|
2409
Zillow
ZG
$7.02B
| $1.67M | ﹤0.01% |
+13,658
| New | +$1.69M |
|
2410
ProShares UltraPro Short Russell2000
SRTY
$76.3M
| $1.67M | ﹤0.01% |
9,311
+8,088
| +661% | +$1.6M |
|
2411
CALL
Abercrombie & Fitch
ANF
$4.17B
| $1.67M | ﹤0.01% |
36,000
+35,312
| +5,133% | +$1.42M |
|
2412
CALL
Telus
TU
$16B
| $1.67M | ﹤0.01% |
74,400
+73,551
| +8,663% | +$1.59M |
|
2413
Domino's
DPZ
$11B
| $1.67M | ﹤0.01% |
+3,575
| New | +$1.52M |
|
|
OPTU
2414
PUT
Optimum Communications Inc
OPTU
$316M
| $1.67M | ﹤0.01% |
48,800
+48,486
| +15,441% | +$1.7M |
|
2415
CALL
Baxter International
BAX
$11.6B
| $1.67M | ﹤0.01% |
+20,700
| New | +$1.74M |
|
2416
CALL
Porch Group
PRCH
$1.3B
| $1.67M | ﹤0.01% |
86,100
+84,937
| +7,303% | +$1.4M |
|
2417
CALL
Corpay
CPAY
$24.2B
| $1.66M | ﹤0.01% |
6,500
+6,470
| +21,567% | +$1.79M |
|
|
BOWX
2418
CALL
DELISTED
BowX Acquisition Corp. Class A Common Stock
BOWX
| $1.66M | ﹤0.01% |
144,700
+144,619
| +178,542% | +$1.76M |
|
2419
PUT
Virtu Financial
VIRT
$5.2B
| $1.66M | ﹤0.01% |
60,200
+60,019
| +33,160% | +$1.79M |
|
2420
CALL
CNX Resources
CNX
$4.85B
| $1.66M | ﹤0.01% |
121,600
+121,017
| +20,758% | +$1.69M |
|
2421
CALL
Hormel Foods
HRL
$13.9B
| $1.66M | ﹤0.01% |
34,800
+34,590
| +16,471% | +$1.65M |
|
2422
PUT
First Horizon
FHN
$12.1B
| $1.66M | ﹤0.01% |
96,100
+94,969
| +8,397% | +$1.72M |
|
2423
CALL
Katapult Holdings
KPLT
$32.8M
| $1.66M | ﹤0.01% |
6,144
+6,092
| +11,715% | +$1.89M |
|
|
MAPS
2424
CALL
DELISTED
WM TECHNOLOGY INC A
MAPS
| $1.66M | ﹤0.01% |
93,000
+92,774
| +41,050% | +$1.61M |
|
2425
CALL
VF Corp
VFC
$6.68B
| $1.66M | ﹤0.01% |
20,200
+20,019
| +11,060% | +$1.67M |
|
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 deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- 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 2,250 new positions and closed 1,197 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.