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 | |
|---|---|---|---|---|---|---|
6476
CALL
QuickLogic
QUIK
$232M
| $119K | ﹤0.01% |
16,500
+16,409
| +18,032% | +$107K |
|
6477
PUT
Spectrum Brands
SPB
$2.04B
| $119K | ﹤0.01% |
1,400
+1,387
| +10,669% | +$122K |
|
6478
Vicor
VICR
$9.56B
| $119K | ﹤0.01% |
1,131
+426
| +60% | +$37.9K |
|
|
PVG
6479
DELISTED
PRETIUM RESOURCES INC.
PVG
| $119K | ﹤0.01% |
12,453
+10,840
| +672% | +$118K |
|
6480
CALL
Atea Pharmaceuticals
AVIR
$376M
| $118K | ﹤0.01% |
5,500
+5,471
| +18,866% | +$164K |
|
6481
PUT
CareDx
CDNA
$2.26B
| $118K | ﹤0.01% |
1,300
+1,207
| +1,298% | +$95.9K |
|
6482
Castle Biosciences
CSTL
$855M
| $118K | ﹤0.01% |
+1,620
| New | +$107K |
|
6483
PUT
Curtiss-Wright
CW
$26.7B
| $118K | ﹤0.01% |
+1,000
| New | +$125K |
|
|
DEA
6484
CALL
Easterly Government Properties
DEA
$1.13B
| $118K | ﹤0.01% |
2,240
+2,239
| +223,900% | +$118K |
|
6485
PUT
Four Corners Property Trust
FCPT
$2.81B
| $118K | ﹤0.01% |
4,300
+4,274
| +16,438% | +$121K |
|
6486
INmune Bio
INMB
$46.5M
| $118K | ﹤0.01% |
+6,766
| New | +$91.2K |
|
6487
PUT
Markel Group
MKL
$23.3B
| $118K | ﹤0.01% |
100
+98
| +4,900% | +$117K |
|
6488
PUT
TTM Technologies
TTMI
$12B
| $118K | ﹤0.01% |
8,300
+8,254
| +17,943% | +$123K |
|
6489
Vanguard FTSE Developed Markets ETF
VEA
$229B
| $118K | ﹤0.01% |
2,297
-7,983
| -78% | -$412K |
|
6490
CALL
Vanguard Total International Stock ETF
VXUS
$155B
| $118K | ﹤0.01% |
1,800
+1,799
| +179,900% | +$118K |
|
|
WPRT
6491
PUT
Westport Fuel Systems
WPRT
$33.5M
| $118K | ﹤0.01% |
2,230
+2,183
| +4,645% | +$132K |
|
|
VIEW
6492
DELISTED
View, Inc. Class A Common Stock
VIEW
| $118K | ﹤0.01% |
234
-872
| -79% | -$428K |
|
|
ATRS
6493
DELISTED
Antares Pharma, Inc.
ATRS
| $118K | ﹤0.01% |
27,236
-7,279
| -21% | -$29.7K |
|
|
XENT
6494
DELISTED
Intersect ENT, Inc
XENT
| $118K | ﹤0.01% |
6,963
-17,557
| -72% | -$329K |
|
6495
PUT
ACV Auctions
ACVA
$1.31B
| $117K | ﹤0.01% |
+4,600
| New | +$134K |
|
6496
CALL
AXIS Capital
AXS
$7.68B
| $117K | ﹤0.01% |
2,400
+2,393
| +34,186% | +$127K |
|
6497
CALL
McEwen Inc
MUX
$1.03B
| $117K | ﹤0.01% |
+8,490
| New | +$112K |
|
6498
PUT
Nabors Industries
NBR
$1.27B
| $117K | ﹤0.01% |
9,500
+9,460
| +23,650% | +$952K |
|
6499
VanEck Rare Earth/Strategic Metals ETF
REMX
$1.95B
| $117K | ﹤0.01% |
1,387
-5,869
| -81% | -$475K |
|
6500
iShares MSCI Thailand ETF
THD
$369M
| $117K | ﹤0.01% |
1,503
+145
| +11% | +$11.6K |
|
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.