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 | |
|---|---|---|---|---|---|---|
426
PUT
GE Aerospace
GE
$350B
| $21.3M | 0.02% |
318,230
+314,989
| +9,719% | +$21M |
|
427
CALL
Kimberly-Clark
KMB
$34.9B
| $21.3M | 0.02% |
159,500
+158,854
| +24,590% | +$21.2M |
|
428
CALL
Skyworks Solutions
SWKS
$11.1B
| $21.1M | 0.02% |
110,000
+109,537
| +23,658% | +$19.4M |
|
429
CALL
Capital One
COF
$135B
| $21.1M | 0.02% |
+136,200
| New | +$20.5M |
|
430
CALL
Accenture
ACN
$114B
| $21M | 0.02% |
+71,400
| New | +$20.4M |
|
431
PUT
Unity
U
$18.3B
| $21M | 0.02% |
191,100
+188,931
| +8,711% | +$18.6M |
|
432
CALL
Altria Group
MO
$115B
| $20.8M | 0.02% |
435,400
+433,271
| +20,351% | +$21.3M |
|
|
LOGC
433
DELISTED
ContextLogic
LOGC
| $20.7M | 0.02% |
52,415
+50,534
| +2,687% | +$17.9M |
|
434
PUT
Devon Energy
DVN
$52.9B
| $20.6M | 0.02% |
+705,500
| New | +$18.2M |
|
435
CALL
Datadog
DDOG
$76.5B
| $20.6M | 0.02% |
197,600
+195,829
| +11,058% | +$17.7M |
|
436
CALL
Toronto Dominion Bank
TD
$199B
| $20.5M | 0.02% |
292,000
+291,415
| +49,815% | +$20.4M |
|
437
CALL
Diamondback Energy
FANG
$55.8B
| $20.4M | 0.02% |
217,800
+215,803
| +10,806% | +$17.8M |
|
438
CALL
Wayfair
W
$13.6B
| $20.4M | 0.02% |
64,700
+63,905
| +8,038% | +$20M |
|
439
PUT
WIX.com
WIX
$3.19B
| $20.3M | 0.02% |
69,900
+68,794
| +6,220% | +$19.3M |
|
440
CALL
Futu Holdings
FUTU
$17.1B
| $20.3M | 0.02% |
113,100
+111,012
| +5,317% | +$16.1M |
|
441
PUT
American Tower
AMT
$81.9B
| $20.1M | 0.02% |
74,500
+73,420
| +6,798% | +$18.7M |
|
442
CALL
Marathon Digital Holdings
MARA
$4.37B
| $20M | 0.02% |
638,800
+633,521
| +12,001% | +$20.1M |
|
443
Freeport-McMoran
FCX
$104B
| $20M | 0.02% |
538,234
+285,158
| +113% | +$11.1M |
|
444
CALL
Zillow
Z
$7.78B
| $19.9M | 0.02% |
162,900
+160,500
| +6,688% | +$19.5M |
|
445
CALL
Workday
WDAY
$47.2B
| $19.8M | 0.02% |
83,000
+82,542
| +18,022% | +$19.9M |
|
446
CALL
Arista Networks
ANET
$244B
| $19.8M | 0.02% |
+873,600
| New | +$18.2M |
|
|
PXD
447
CALL
DELISTED
Pioneer Natural Resource Co.
PXD
| $19.7M | 0.02% |
121,300
+120,746
| +21,795% | +$19M |
|
448
PUT
SLB Ltd
SLB
$85.3B
| $19.7M | 0.02% |
614,700
+610,232
| +13,658% | +$18.7M |
|
449
PUT
MetLife
MET
$62B
| $19.6M | 0.02% |
328,300
+326,383
| +17,026% | +$20.7M |
|
450
PUT
Vanguard FTSE Europe ETF
VGK
$31.1B
| $19.6M | 0.02% |
325,100
+322,954
| +15,049% | +$21.8M |
|
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.