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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
7001
CALL
Edgewise Therapeutics
EWTX
$4.48B
| $15K | ﹤0.01% |
1,200
-134,700
| -99% | -$1.94M |
|
7002
Ezcorp Inc
EZPW
$1.87B
| $15K | ﹤0.01% |
1,085
-14,323
| -93% | -$207K |
|
7003
Greif
GEF
$4.56B
| $15K | ﹤0.01% |
235
+144
| +158% | +$8.19K |
|
7004
Greystone Housing Impact Investors LP
GHI
$121M
| $15K | ﹤0.01% |
1,355
+831
| +159% | +$9.73K |
|
7005
PUT
Gray Television
GTN
$409M
| $15K | ﹤0.01% |
3,500
-3,000
| -46% | -$11.6K |
|
7006
Harmonic Inc
HLIT
$1.23B
| $15K | ﹤0.01% |
1,661
-2,643
| -61% | -$24.1K |
|
7007
CALL
Heron Therapeutics
HRTX
$86.9M
| $15K | ﹤0.01% |
7,300
-86,300
| -92% | -$176K |
|
7008
PUT
MarineMax
HZO
$799M
| $15K | ﹤0.01% |
600
| – | – |
|
7009
CALL
Information Services Group
III
$192M
| $15K | ﹤0.01% |
+3,300
| New | +$14.2K |
|
|
IRS
7010
PUT
IRSA Inversiones y Representaciones
IRS
$1.31B
| $15K | ﹤0.01% |
1,100
+100
| +10% | +$1.43K |
|
7011
CALL
Janus International
JBI
$732M
| $15K | ﹤0.01% |
1,900
+900
| +90% | +$6.86K |
|
7012
PUT
908 Devices
MASS
$293M
| $15K | ﹤0.01% |
2,200
-13,600
| -86% | -$75.6K |
|
7013
PUT
MidCap Financial Investment
MFIC
$790M
| $15K | ﹤0.01% |
1,200
+400
| +50% | +$4.91K |
|
7014
CALL
MacroGenics
MGNX
$254M
| $15K | ﹤0.01% |
12,900
+2,500
| +24% | +$3.63K |
|
7015
Mitek Systems
MITK
$768M
| $15K | ﹤0.01% |
1,598
-1,879
| -54% | -$16.9K |
|
7016
Newmark Group
NMRK
$2.82B
| $15K | ﹤0.01% |
1,296
+914
| +239% | +$10.2K |
|
7017
Energy Vault
NRGV
$531M
| $15K | ﹤0.01% |
21,726
-17,387
| -44% | -$14K |
|
7018
Nuvectis Pharma
NVCT
$616M
| $15K | ﹤0.01% |
+2,114
| New | +$19.2K |
|
7019
Organon & Co
OGN
$3.56B
| $15K | ﹤0.01% |
+1,608
| New | +$16.6K |
|
7020
Pliant Therapeutics
PLRX
$66.9M
| $15K | ﹤0.01% |
13,286
+7,983
| +151% | +$11.3K |
|
7021
PUT
Perimeter Solutions
PRM
$5.44B
| $15K | ﹤0.01% |
+1,100
| New | +$12.7K |
|
|
PVL
7022
PUT
Permianville Royalty Trust
PVL
$56.1M
| $15K | ﹤0.01% |
8,600
+4,100
| +91% | +$6.56K |
|
7023
PUT
Radiant Logistics
RLGT
$415M
| $15K | ﹤0.01% |
2,500
-5,500
| -69% | -$32.9K |
|
7024
CALL
Stellus Capital Investment Corp
SCM
$204M
| $15K | ﹤0.01% |
+1,100
| New | +$14.5K |
|
7025
SIGA Technologies
SIGA
$222M
| $15K | ﹤0.01% |
2,316
-131
| -5% | -$786 |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.