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 | |
|---|---|---|---|---|---|---|
|
WOW
5726
DELISTED
WideOpenWest
WOW
| $62K | ﹤0.01% |
15,380
-25,994
| -63% | -$111K |
|
|
ALMS
5727
CALL
Alumis Inc
ALMS
$3.69B
| $62K | ﹤0.01% |
+20,800
| New | +$98.2K |
|
5728
YieldMax COIN Option Income Strategy ETF
CONY
$346M
| $61K | ﹤0.01% |
+672
| New | +$54K |
|
5729
CALL
Cheniere Energy
CQP
$31.5B
| $61K | ﹤0.01% |
1,100
-2,500
| -69% | -$146K |
|
5730
CALL
Energy Recovery
ERII
$435M
| $61K | ﹤0.01% |
4,800
+300
| +7% | +$4.07K |
|
5731
PUT
EXL Service
EXLS
$5.21B
| $61K | ﹤0.01% |
+1,400
| New | +$64K |
|
5732
Hayward Holdings
HAYW
$3.26B
| $61K | ﹤0.01% |
4,446
+2,949
| +197% | +$39.7K |
|
5733
CALL
Janus Henderson Small Cap Growth Alpha ETF
JSML
$365M
| $61K | ﹤0.01% |
1,300
+700
| +117% | +$43.7K |
|
5734
Ligand Pharmaceuticals
LGND
$5.94B
| $61K | ﹤0.01% |
+540
| New | +$57.7K |
|
|
PDM
5735
CALL
Piedmont Realty Trust
PDM
$1.25B
| $61K | ﹤0.01% |
8,500
+6,100
| +254% | +$42.1K |
|
5736
Sana Biotechnology
SANA
$904M
| $61K | ﹤0.01% |
22,682
+7,209
| +47% | +$14.9K |
|
|
SGMO
5737
CALL
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $61K | ﹤0.01% |
112,900
-24,300
| -18% | -$14.4K |
|
5738
PUT
Apogee Therapeutics
APGE
$10.2B
| $60K | ﹤0.01% |
1,400
+1,300
| +1,300% | +$49.5K |
|
5739
PUT
Cabot Corp
CBT
$4.55B
| $60K | ﹤0.01% |
+800
| New | +$61.2K |
|
5740
CALL
Grupo Cibest SA
CIB
$22.3B
| $60K | ﹤0.01% |
1,300
-3,300
| -72% | -$137K |
|
5741
Crescent Energy
CRGY
$3.69B
| $60K | ﹤0.01% |
7,070
+5,792
| +453% | +$50.7K |
|
5742
CALL
GoPro
GPRO
$124M
| $60K | ﹤0.01% |
79,300
+46,400
| +141% | +$30.2K |
|
5743
PUT
Immunome
IMNM
$2.61B
| $60K | ﹤0.01% |
6,500
-800
| -11% | -$6.56K |
|
5744
Global X US Infrastructure Development ETF
PAVE
$13.8B
| $60K | ﹤0.01% |
1,398
-831
| -37% | -$33.2K |
|
5745
CALL
SES AI
SES
$200M
| $60K | ﹤0.01% |
68,400
-37,900
| -36% | -$31.8K |
|
5746
CALL
Veru
VERU
$35.6M
| $60K | ﹤0.01% |
10,390
+3,460
| +50% | +$19.4K |
|
5747
PUT
Veralto
VLTO
$23.1B
| $60K | ﹤0.01% |
600
-25,300
| -98% | -$2.44M |
|
|
VRNT
5748
PUT
DELISTED
Verint Systems
VRNT
| $60K | ﹤0.01% |
3,100
-10,100
| -77% | -$176K |
|
|
CMBT
5749
CALL
CMB.TECH NV
CMBT
$4.65B
| $60K | ﹤0.01% |
6,700
+6,200
| +1,240% | +$56.6K |
|
|
JBTM
5750
PUT
JBT Marel
JBTM
$7.31B
| $60K | ﹤0.01% |
500
-200
| -29% | -$22.3K |
|
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.