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 | |
|---|---|---|---|---|---|---|
5701
ProShares VIX Mid-Term Futures ETF
VIXM
$56.3M
| $63K | ﹤0.01% |
3,789
-9,253
| -71% | -$160K |
|
|
BIOA
5702
BioAge Labs
BIOA
$1.1B
| $63K | ﹤0.01% |
15,281
-6,322
| -29% | -$25.5K |
|
|
LMBO
5703
DELISTED
Direxion Daily Crypto Industry Bull 2X ETF
LMBO
| $63K | ﹤0.01% |
+2,518
| New | +$44.5K |
|
|
ACRE
5704
PUT
Ares Commercial Real Estate
ACRE
$239M
| $62K | ﹤0.01% |
13,000
-100
| -0.8% | -$444 |
|
5705
PUT
Andersons Inc
ANDE
$2.44B
| $62K | ﹤0.01% |
+1,700
| New | +$62.3K |
|
5706
CALL
AptarGroup
ATR
$8.54B
| $62K | ﹤0.01% |
+400
| New | +$60.4K |
|
5707
CALL
AXIS Capital
AXS
$7.67B
| $62K | ﹤0.01% |
600
-600
| -50% | -$59.7K |
|
5708
PUT
Crescent Capital BDC
CCAP
$400M
| $62K | ﹤0.01% |
4,400
+1,600
| +57% | +$24.6K |
|
5709
PUT
CMS Energy
CMS
$22.7B
| $62K | ﹤0.01% |
900
+800
| +800% | +$57K |
|
5710
Crexendo
CXDO
$221M
| $62K | ﹤0.01% |
10,365
+5,722
| +123% | +$29.9K |
|
|
DVAX
5711
PUT
DELISTED
Dynavax Technologies
DVAX
| $62K | ﹤0.01% |
6,300
+200
| +3% | +$2.11K |
|
|
FBRT
5712
CALL
Franklin BSP Realty Trust
FBRT
$643M
| $62K | ﹤0.01% |
5,800
-40,000
| -87% | -$449K |
|
|
HES
5713
PUT
DELISTED
Hess
HES
| $62K | ﹤0.01% |
9,200
+5,300
| +136% | +$716K |
|
5714
CALL
Lincoln Electric
LECO
$13.7B
| $62K | ﹤0.01% |
300
-400
| -57% | -$76.5K |
|
5715
CALL
Medpace
MEDP
$16.1B
| $62K | ﹤0.01% |
200
-1,100
| -85% | -$330K |
|
5716
PUT
Mohawk Industries
MHK
$7.29B
| $62K | ﹤0.01% |
600
-12,800
| -96% | -$1.33M |
|
5717
CALL
Madison Square Garden
MSGS
$9.75B
| $62K | ﹤0.01% |
+300
| New | +$57.8K |
|
5718
CALL
Matrix Service
MTRX
$320M
| $62K | ﹤0.01% |
4,600
-2,300
| -33% | -$27.8K |
|
5719
PUT
NET Power
NPWR
$130M
| $62K | ﹤0.01% |
25,200
+17,200
| +215% | +$36.1K |
|
5720
PetMed Express
PETS
$42.3M
| $62K | ﹤0.01% |
18,770
-13,871
| -42% | -$49.4K |
|
5721
CALL
State Street Multi-Asset Real Return ETF
RLY
$1.27B
| $62K | ﹤0.01% |
1,500
+1,400
| +1,400% | +$39.7K |
|
5722
Safe Bulkers
SB
$810M
| $62K | ﹤0.01% |
+17,441
| New | +$62.4K |
|
5723
PUT
CVR Partners
UAN
$1.35B
| $62K | ﹤0.01% |
700
-1,000
| -59% | -$80.5K |
|
5724
CALL
VinFast Auto
VFS
$7.25B
| $62K | ﹤0.01% |
17,500
-7,700
| -31% | -$26.1K |
|
5725
PUT
VirTra
VTSI
$35.7M
| $62K | ﹤0.01% |
8,900
-1,900
| -18% | -$10K |
|
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.