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 | |
|---|---|---|---|---|---|---|
|
ESPR
5826
CALL
DELISTED
Esperion Therapeutics
ESPR
| $55K | ﹤0.01% |
56,300
-14,400
| -20% | -$14.4K |
|
5827
Five Point Holdings
FPH
$383M
| $55K | ﹤0.01% |
10,180
+7,374
| +263% | +$39.5K |
|
5828
Halozyme
HALO
$9.88B
| $55K | ﹤0.01% |
+1,069
| New | +$60.8K |
|
5829
PUT
Janux Therapeutics
JANX
$950M
| $55K | ﹤0.01% |
2,400
-3,500
| -59% | -$92.2K |
|
5830
CALL
Lloyds Banking Group
LYG
$90.7B
| $55K | ﹤0.01% |
+13,100
| New | +$52.1K |
|
5831
CALL
Mizuho Financial
MFG
$126B
| $55K | ﹤0.01% |
10,000
+5,300
| +113% | +$27.5K |
|
5832
Northwest Bancshares
NWBI
$2.3B
| $55K | ﹤0.01% |
+4,326
| New | +$52.5K |
|
5833
PUT
Northwest Natural Holdings
NWN
$2.11B
| $55K | ﹤0.01% |
1,400
-800
| -36% | -$33.2K |
|
5834
PUT
Perdoceo Education
PRDO
$2.04B
| $55K | ﹤0.01% |
1,700
+1,600
| +1,600% | +$47.4K |
|
5835
Reinsurance Group of America
RGA
$15.6B
| $55K | ﹤0.01% |
282
-22
| -7% | -$4.29K |
|
5836
RLJ Lodging Trust
RLJ
$1.87B
| $55K | ﹤0.01% |
+7,616
| New | +$54.9K |
|
5837
PUT
Rayonier
RYN
$6.43B
| $55K | ﹤0.01% |
2,622
-7,866
| -75% | -$180K |
|
5838
Sabre
SABR
$739M
| $55K | ﹤0.01% |
+17,697
| New | +$45.4K |
|
5839
CALL
TaskUs
TASK
$542M
| $55K | ﹤0.01% |
3,300
-3,700
| -53% | -$56.4K |
|
5840
PUT
United Microelectronic
UMC
$47.5B
| $55K | ﹤0.01% |
7,200
-7,300
| -50% | -$54.2K |
|
|
LENZ
5841
CALL
LENZ Therapeutics
LENZ
$181M
| $55K | ﹤0.01% |
+1,900
| New | +$51.7K |
|
|
SMST
5842
Defiance Daily Target 2x Short MSTR ETF
SMST
$27.7M
| $55K | ﹤0.01% |
2,329
+1,017
| +78% | +$36.9K |
|
5843
Ares Capital
ARCC
$13.5B
| $54K | ﹤0.01% |
+2,464
| New | +$52.4K |
|
5844
Amplify Travel Tech ETF
AWAY
$26M
| $54K | ﹤0.01% |
2,536
+1,386
| +121% | +$28.2K |
|
5845
Banco Bilbao Vizcaya Argentaria
BBVA
$152B
| $54K | ﹤0.01% |
+3,575
| New | +$51.5K |
|
5846
PUT
CG Oncology
CGON
$6.44B
| $54K | ﹤0.01% |
2,100
| – | – |
|
|
CPRX
5847
DELISTED
Catalyst Pharmaceutical
CPRX
| $54K | ﹤0.01% |
2,499
-762
| -23% | -$18K |
|
5848
CALL
Amdocs
DOX
$5.87B
| $54K | ﹤0.01% |
600
-900
| -60% | -$80.4K |
|
5849
PUT
Emergent Biosolutions
EBS
$375M
| $54K | ﹤0.01% |
8,500
-10,900
| -56% | -$62.4K |
|
5850
PUT
Editas Medicine
EDIT
$413M
| $54K | ﹤0.01% |
24,700
-10,500
| -30% | -$17.2K |
|
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.