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 | |
|---|---|---|---|---|---|---|
|
ZENA
5926
CALL
ZenaTech Inc
ZENA
$116M
| $50K | ﹤0.01% |
+13,700
| New | +$39.5K |
|
5927
PUT
Allegiant Air
ALGT
$2.66B
| $49K | ﹤0.01% |
900
-3,100
| -78% | -$160K |
|
5928
CALL
Avista
AVA
$3.39B
| $49K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$47.3K |
|
5929
Brookfield Infrastructure
BIPC
$5.24B
| $49K | ﹤0.01% |
+1,189
| New | +$45.8K |
|
5930
PUT
Designer Brands
DBI
$314M
| $49K | ﹤0.01% |
20,600
-178,900
| -90% | -$540K |
|
5931
Diageo
DEO
$49.5B
| $49K | ﹤0.01% |
493
-13,985
| -97% | -$1.52M |
|
5932
CALL
First American
FAF
$7.71B
| $49K | ﹤0.01% |
+800
| New | +$47.5K |
|
|
FFWM
5933
CALL
DELISTED
First Foundation Inc
FFWM
| $49K | ﹤0.01% |
9,800
+9,500
| +3,167% | +$48.6K |
|
5934
Jefferies Financial Group
JEF
$12.7B
| $49K | ﹤0.01% |
910
-6,485
| -88% | -$321K |
|
5935
PUT
LivaNova
LIVN
$4.45B
| $49K | ﹤0.01% |
1,100
+900
| +450% | +$37.1K |
|
5936
Lexicon Pharmaceuticals
LXRX
$1.04B
| $49K | ﹤0.01% |
52,680
-122,302
| -70% | -$79.2K |
|
5937
CALL
First Trust Exchange-Traded Fund VI Multi-Asset Diversified Income Index Fund
MDIV
$430M
| $49K | ﹤0.01% |
800
+200
| +33% | +$3.15K |
|
5938
CALL
OptimizeRx
OPRX
$118M
| $49K | ﹤0.01% |
3,700
-6,200
| -63% | -$67.8K |
|
|
PCH
5939
PUT
DELISTED
PotlatchDeltic
PCH
| $49K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$47.1K |
|
5940
CALL
Quince Therapeutics
QNCX
$22.5M
| $49K | ﹤0.01% |
149
-23
| -13% | -$5.26K |
|
5941
PUT
Repligen
RGEN
$7.03B
| $49K | ﹤0.01% |
400
-5,200
| -93% | -$662K |
|
|
SEE
5942
PUT
DELISTED
Sealed Air
SEE
| $49K | ﹤0.01% |
1,600
-5,600
| -78% | -$167K |
|
5943
SurgePays
SURG
$5.43M
| $49K | ﹤0.01% |
15,827
-2,870
| -15% | -$7.94K |
|
5944
CALL
Transportadora de Gas del Sur
TGS
$4.73B
| $49K | ﹤0.01% |
1,900
+800
| +73% | +$21.9K |
|
5945
CALL
Valley National Bancorp
VLY
$7.92B
| $49K | ﹤0.01% |
5,500
-17,400
| -76% | -$151K |
|
5946
Ambev
ABEV
$48.2B
| $48K | ﹤0.01% |
19,969
-142,254
| -88% | -$346K |
|
|
API
5947
Agora
API
$337M
| $48K | ﹤0.01% |
12,620
-7,531
| -37% | -$26.2K |
|
5948
PUT
Associated Banc-Corp
ASB
$5.8B
| $48K | ﹤0.01% |
2,000
+1,200
| +150% | +$27K |
|
5949
PUT
Mission Produce
AVO
$1.13B
| $48K | ﹤0.01% |
+4,100
| New | +$44.4K |
|
5950
CALL
Babcock & Wilcox
BW
$1.41B
| $48K | ﹤0.01% |
50,800
+20,300
| +67% | +$13.9K |
|
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.