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 | |
|---|---|---|---|---|---|---|
6251
Backblaze
BLZE
$683M
| $35K | ﹤0.01% |
6,381
-5,530
| -46% | -$28.1K |
|
|
CRGX
6252
CALL
DELISTED
CARGO Therapeutics
CRGX
| $35K | ﹤0.01% |
8,600
+500
| +6% | +$2.14K |
|
6253
Denali Therapeutics
DNLI
$3.79B
| $35K | ﹤0.01% |
+2,502
| New | +$35.2K |
|
6254
iShares MSCI Indonesia ETF
EIDO
$466M
| $35K | ﹤0.01% |
2,039
-422
| -17% | -$7.37K |
|
6255
PUT
Federated Hermes
FHI
$4.56B
| $35K | ﹤0.01% |
+800
| New | +$32.9K |
|
6256
CALL
Gentex
GNTX
$5.1B
| $35K | ﹤0.01% |
1,600
-800
| -33% | -$17.5K |
|
6257
CALL
ICL Group
ICL
$6.58B
| $35K | ﹤0.01% |
5,100
+4,800
| +1,600% | +$31.3K |
|
6258
CALL
Inter&Co
INTR
$2.39B
| $35K | ﹤0.01% |
4,800
-3,200
| -40% | -$21.3K |
|
6259
Intrepid Potash
IPI
$476M
| $35K | ﹤0.01% |
+998
| New | +$34K |
|
|
6260
PUT
Intrepid Potash
IPI
$476M
| $35K | ﹤0.01% |
1,000
-3,000
| -75% | -$102K |
|
|
KNDI
6261
PUT
Kandi Technologies Group
KNDI
$66.5M
| $35K | ﹤0.01% |
32,100
| – | – |
|
6262
PUT
Kiniksa Pharmaceuticals
KNSA
$6.31B
| $35K | ﹤0.01% |
+1,300
| New | +$33.1K |
|
6263
PUT
Koppers
KOP
$946M
| $35K | ﹤0.01% |
+1,100
| New | +$31.6K |
|
6264
PUT
American Century Diversified Corporate Bond ETF
KORP
$869M
| $35K | ﹤0.01% |
500
-1,900
| -79% | -$87.7K |
|
6265
Karyopharm Therapeutics
KPTI
$155M
| $35K | ﹤0.01% |
+8,233
| New | +$40.4K |
|
|
MVO
6266
CALL
DELISTED
MV Oil Trust
MVO
| $35K | ﹤0.01% |
6,100
+4,800
| +369% | +$27.8K |
|
|
NOTE
6267
CALL
DELISTED
FiscalNote
NOTE
| $35K | ﹤0.01% |
5,567
-3,925
| -41% | -$29.4K |
|
6268
PUT
NatWest
NWG
$69.9B
| $35K | ﹤0.01% |
2,500
+1,000
| +67% | +$13.2K |
|
6269
PUT
ONE Gas
OGS
$5.01B
| $35K | ﹤0.01% |
500
+400
| +400% | +$30K |
|
6270
Invesco Aerospace & Defense ETF
PPA
$8.07B
| $35K | ﹤0.01% |
252
-232
| -48% | -$29.4K |
|
|
PROF
6271
PUT
Profound Medical
PROF
$263M
| $35K | ﹤0.01% |
6,000
| – | – |
|
6272
Tuttle Capital Daily 2X Inverse Regional Banks ETF
SKRE
$5.07M
| $35K | ﹤0.01% |
+2,961
| New | +$41.7K |
|
6273
Sprout Social
SPT
$530M
| $35K | ﹤0.01% |
1,681
-966
| -36% | -$20.5K |
|
6274
PUT
Cambria Tail Risk ETF
TAIL
$150M
| $35K | ﹤0.01% |
1,200
+900
| +300% | +$11.2K |
|
6275
PUT
TransUnion
TRU
$16B
| $35K | ﹤0.01% |
400
-200
| -33% | -$16.7K |
|
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.