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 | |
|---|---|---|---|---|---|---|
|
AXU
6551
CALL
DELISTED
Alexco Resource Corp
AXU
| $113K | ﹤0.01% |
45,200
+45,117
| +54,358% | +$127K |
|
6552
PUT
AppFolio
APPF
$6.38B
| $112K | ﹤0.01% |
800
+790
| +7,900% | +$110K |
|
6553
Brighthouse Financial
BHF
$3.56B
| $112K | ﹤0.01% |
2,477
-9,652
| -80% | -$453K |
|
|
GDEN
6554
CALL
DELISTED
Golden Entertainment
GDEN
| $112K | ﹤0.01% |
2,500
+2,442
| +4,210% | +$93.4K |
|
6555
Nektar Therapeutics
NKTR
$2.39B
| $112K | ﹤0.01% |
436
+56
| +15% | +$15.5K |
|
6556
CALL
Redwire
RDW
$2.06B
| $112K | ﹤0.01% |
+10,900
| New | +$111K |
|
6557
CALL
SunCoke Energy
SXC
$720M
| $112K | ﹤0.01% |
15,800
+15,465
| +4,616% | +$110K |
|
|
VRNT
6558
CALL
DELISTED
Verint Systems
VRNT
| $112K | ﹤0.01% |
16,300
+15,565
| +2,118% | +$722K |
|
|
XIN
6559
CALL
DELISTED
Xinyuan Real Estate
XIN
| $112K | ﹤0.01% |
4,250
+4,222
| +15,079% | +$109K |
|
6560
PUT
ZipRecruiter
ZIP
$321M
| $112K | ﹤0.01% |
+4,500
| New | +$102K |
|
|
GMBL
6561
DELISTED
Esports Entertainment Group Inc. Common Stock
GMBL
| – | – |
-1
| Closed | -$471K |
|
|
TRHC
6562
DELISTED
Tabula Rasa HealthCare, Inc. Common Stock
TRHC
| $112K | ﹤0.01% |
2,255
-3,196
| -59% | -$143K |
|
|
UMPQ
6563
CALL
DELISTED
Umpqua Holdings Corp
UMPQ
| $112K | ﹤0.01% |
6,100
+6,045
| +10,991% | +$112K |
|
|
MANT
6564
PUT
DELISTED
Mantech International Corp
MANT
| $112K | ﹤0.01% |
+1,300
| New | +$112K |
|
|
ACH
6565
DELISTED
Alum Corp of China Ltd
ACH
| $112K | ﹤0.01% |
7,637
+5,802
| +316% | +$78.5K |
|
|
GTT
6566
PUT
DELISTED
GTT Communications, Inc.
GTT
| $112K | ﹤0.01% |
65,000
+64,942
| +111,969% | +$126K |
|
|
STEX
6567
CALL
Streamex Corp
STEX
$74M
| $111K | ﹤0.01% |
2,890
+2,859
| +9,223% | +$107K |
|
6568
PUT
Comtech Telecommunications
CMTL
$50.3M
| $111K | ﹤0.01% |
4,600
+4,540
| +7,567% | +$111K |
|
6569
PUT
Conduent
CNDT
$244M
| $111K | ﹤0.01% |
14,900
+14,044
| +1,641% | +$102K |
|
6570
PUT
Entera Bio
ENTX
$147M
| $111K | ﹤0.01% |
+18,700
| New | +$69.1K |
|
6571
CALL
Full House Resorts
FLL
$80.1M
| $111K | ﹤0.01% |
11,200
+11,196
| +279,900% | +$108K |
|
6572
CALL
Invesco CurrencyShares Australian Dollar Trust
FXA
$97.6M
| $111K | ﹤0.01% |
+1,500
| New | +$115K |
|
|
GRFS
6573
PUT
Grifois
GRFS
$5.36B
| $111K | ﹤0.01% |
6,400
+6,213
| +3,322% | +$111K |
|
6574
CALL
Immersion
IMMR
$251M
| $111K | ﹤0.01% |
12,700
+12,430
| +4,604% | +$107K |
|
6575
PUT
Kosmos Energy
KOS
$1.6B
| $111K | ﹤0.01% |
32,300
+31,999
| +10,631% | +$99.2K |
|
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.