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 | |
|---|---|---|---|---|---|---|
6701
CALL
Korro Bio
KRRO
$150M
| $102K | ﹤0.01% |
206
+199
| +2,843% | +$97.2K |
|
|
SII
6702
PUT
Sprott
SII
$2.66B
| $102K | ﹤0.01% |
2,600
+2,431
| +1,438% | +$104K |
|
6703
CALL
Silicon Motion
SIMO
$8.6B
| $102K | ﹤0.01% |
1,600
+1,535
| +2,362% | +$101K |
|
6704
CALL
VirnetX Holding Corp
VHC
$54.4M
| $102K | ﹤0.01% |
+1,205
| New | +$113K |
|
6705
Vanguard Communication Services ETF
VOX
$5.59B
| $102K | ﹤0.01% |
+710
| New | +$97.8K |
|
|
CDMO
6706
PUT
DELISTED
Avid Bioservices, Inc. Common Stock
CDMO
| $102K | ﹤0.01% |
4,000
+3,951
| +8,063% | +$84.4K |
|
|
CONX
6707
DELISTED
CONX Corp. Class A Common Stock
CONX
| $102K | ﹤0.01% |
10,433
-22,303
| -68% | -$221K |
|
|
ADAP
6708
CALL
DELISTED
Adaptimmune Therapeutics
ADAP
| $101K | ﹤0.01% |
23,800
+23,724
| +31,216% | +$115K |
|
6709
PUT
Axsome Therapeutics
AXSM
$11.2B
| $101K | ﹤0.01% |
1,500
+1,470
| +4,900% | +$88.2K |
|
|
SLAI
6710
PUT
DELISTED
SOLAI Ltd ADS
SLAI
| $101K | ﹤0.01% |
184
+173
| +1,573% | +$153K |
|
6711
PUT
Delek US
DK
$4.16B
| $101K | ﹤0.01% |
4,700
+4,645
| +8,445% | +$105K |
|
6712
CALL
Innoviva
INVA
$1.55B
| $101K | ﹤0.01% |
7,600
+7,558
| +17,995% | +$94.6K |
|
6713
CALL
Mistras Group
MG
$484M
| $101K | ﹤0.01% |
+10,300
| New | +$111K |
|
6714
Rhythm Pharmaceuticals
RYTM
$6.81B
| $101K | ﹤0.01% |
5,204
+488
| +10% | +$10.1K |
|
6715
CALL
Travel + Leisure Co
TNL
$4.66B
| $101K | ﹤0.01% |
1,700
+1,380
| +431% | +$87.4K |
|
|
SUNL
6716
CALL
DELISTED
Sunlight Financial Holdings, Inc.
SUNL
| $101K | ﹤0.01% |
6,045
+6,030
| +40,200% | +$1.21M |
|
|
ZVO
6717
PUT
DELISTED
Zovio Inc. Common Stock
ZVO
| $101K | ﹤0.01% |
39,100
+38,483
| +6,237% | +$118K |
|
6718
CALL
Astec Industries
ASTE
$1.16B
| $100K | ﹤0.01% |
1,600
+1,598
| +79,900% | +$112K |
|
6719
Cognyte Software
CGNT
$659M
| $100K | ﹤0.01% |
+4,119
| New | +$102K |
|
6720
PUT
Cyclerion Therapeutics
CYCN
$14.9M
| $100K | ﹤0.01% |
1,285
+1,284
| +128,400% | +$80.4K |
|
|
DEA
6721
Easterly Government Properties
DEA
$1.13B
| $100K | ﹤0.01% |
1,910
+1,874
| +5,206% | +$99K |
|
6722
PUT
Intellicheck
IDN
$73.1M
| $100K | ﹤0.01% |
12,000
+11,823
| +6,680% | +$97K |
|
|
ODP
6723
CALL
DELISTED
ODP
ODP
| $100K | ﹤0.01% |
2,100
+2,077
| +9,030% | +$91.6K |
|
6724
CALL
Pacer Trendpilot US Large Cap ETF
PTLC
$3.26B
| $100K | ﹤0.01% |
2,500
+2,477
| +10,770% | +$90.6K |
|
|
REVG
6725
DELISTED
REV Group
REVG
| $100K | ﹤0.01% |
6,409
+5,719
| +829% | +$104K |
|
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.