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 | |
|---|---|---|---|---|---|---|
4776
iShares 3-7 Year Treasury Bond ETF
IEI
$18.1B
| $335K | ﹤0.01% |
+2,567
| New | +$335K |
|
4777
CALL
Centrus Energy
LEU
$3.14B
| $335K | ﹤0.01% |
13,200
+13,181
| +69,374% | +$315K |
|
4778
CALL
LHA Market State Tactical Beta ETF
MSTB
$189M
| $335K | ﹤0.01% |
12,700
+12,669
| +40,868% | +$381K |
|
|
AKTS
4779
DELISTED
Akoustis Technologies Inc
AKTS
| $335K | ﹤0.01% |
31,325
+27,363
| +691% | +$289K |
|
|
WRK
4780
DELISTED
WestRock Company
WRK
| $335K | ﹤0.01% |
+6,305
| New | +$353K |
|
4781
CSX Corp
CSX
$94B
| $334K | ﹤0.01% |
+10,430
| New | +$344K |
|
4782
Identive
INVE
$61M
| $334K | ﹤0.01% |
19,659
+6,498
| +49% | +$98.2K |
|
4783
PUT
Prothena Corp
PRTA
$448M
| $334K | ﹤0.01% |
6,500
+6,478
| +29,445% | +$202K |
|
4784
CALL
Papa John's
PZZA
$1.01B
| $334K | ﹤0.01% |
3,200
+3,065
| +2,270% | +$297K |
|
4785
Quantum-Si Incorporated
QSI
$153M
| $334K | ﹤0.01% |
27,290
+5,685
| +26% | +$59.6K |
|
4786
Smith Micro Software
SMSI
$13.6M
| $334K | ﹤0.01% |
1,600
+471
| +42% | +$101K |
|
|
SVM
4787
PUT
Silvercorp Metals
SVM
$2.02B
| $334K | ﹤0.01% |
61,000
+60,590
| +14,778% | +$352K |
|
4788
CALL
CarGurus
CARG
$3.34B
| $333K | ﹤0.01% |
12,700
+12,448
| +4,940% | +$323K |
|
4789
Crane NXT
CXT
$2.99B
| $333K | ﹤0.01% |
10,382
+2,758
| +36% | +$90K |
|
4790
Invesco Mortgage Capital
IVR
$759M
| $333K | ﹤0.01% |
8,542
-10,835
| -56% | -$411K |
|
4791
M&T Bank
MTB
$36.3B
| $333K | ﹤0.01% |
+2,297
| New | +$359K |
|
4792
Matador Resources
MTDR
$6.04B
| $333K | ﹤0.01% |
+9,271
| New | +$270K |
|
4793
PUT
Terex
TEX
$7.37B
| $333K | ﹤0.01% |
7,000
+6,872
| +5,369% | +$334K |
|
|
NXGN
4794
CALL
DELISTED
NextGen Healthcare, Inc. Common Stock
NXGN
| $333K | ﹤0.01% |
20,100
+20,099
| +2,009,900% | +$360K |
|
|
ABMD
4795
DELISTED
Abiomed Inc
ABMD
| $333K | ﹤0.01% |
1,068
-2,143
| -67% | -$657K |
|
|
REV
4796
CALL
DELISTED
Revlon, Inc.
REV
| $333K | ﹤0.01% |
+26,000
| New | +$327K |
|
4797
Donaldson
DCI
$10.7B
| $332K | ﹤0.01% |
5,226
+3,012
| +136% | +$186K |
|
4798
CALL
Jones Lang LaSalle
JLL
$15.8B
| $332K | ﹤0.01% |
1,700
+1,699
| +169,900% | +$332K |
|
4799
CALL
Relmada Therapeutics
RLMD
$540M
| $332K | ﹤0.01% |
10,400
+10,344
| +18,471% | +$359K |
|
4800
PUT
AgEagle Aerial Systems
UAVS
$39.5M
| $332K | ﹤0.01% |
63
+62
| +6,200% | +$340K |
|
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.