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 | |
|---|---|---|---|---|---|---|
|
FETH
4726
PUT
Fidelity Ethereum Fund
FETH
$1.02B
| $163K | ﹤0.01% |
+6,500
| New | +$143K |
|
4727
PUT
Clarivate
CLVT
$1.38B
| $162K | ﹤0.01% |
37,800
+24,700
| +189% | +$99.5K |
|
4728
PUT
Euronet Worldwide
EEFT
$3.19B
| $162K | ﹤0.01% |
1,600
-4,100
| -72% | -$424K |
|
4729
INmune Bio
INMB
$44.9M
| $162K | ﹤0.01% |
70,343
+27,534
| +64% | +$202K |
|
4730
CALL
Rekor Systems
REKR
$82.6M
| $162K | ﹤0.01% |
140,200
-31,500
| -18% | -$33.1K |
|
4731
CALL
Tenable Holdings
TENB
$3.47B
| $162K | ﹤0.01% |
4,800
+3,600
| +300% | +$117K |
|
4732
CALL
United States Antimony
UAMY
$728M
| $162K | ﹤0.01% |
74,700
-229,800
| -75% | -$651K |
|
4733
CALL
PACS Group
PACS
$7.35B
| $162K | ﹤0.01% |
12,600
-92,300
| -88% | -$960K |
|
4734
Agilon Health
AGL
$1.55B
| $161K | ﹤0.01% |
2,803
-2,878
| -51% | -$231K |
|
4735
CALL
Angi Inc
ANGI
$247M
| $161K | ﹤0.01% |
10,600
+8,000
| +308% | +$116K |
|
4736
PUT
AtaiBeckley Inc
ATAI
$2.66B
| $161K | ﹤0.01% |
73,800
+46,500
| +170% | +$83.4K |
|
4737
AXIS Capital
AXS
$7.73B
| $161K | ﹤0.01% |
+1,555
| New | +$155K |
|
4738
CALL
Precigen
PGEN
$1.94B
| $161K | ﹤0.01% |
114,000
+107,700
| +1,710% | +$153K |
|
|
PLTY
4739
YieldMax PLTR Option Income Strategy ETF
PLTY
$312M
| $161K | ﹤0.01% |
+2,515
| New | +$160K |
|
4740
CALL
Amylyx Pharmaceuticals
AMLX
$2.19B
| $160K | ﹤0.01% |
25,000
+19,000
| +317% | +$92.4K |
|
4741
PUT
Braze
BRZE
$3.02B
| $160K | ﹤0.01% |
5,700
-40,900
| -88% | -$1.29M |
|
4742
PUT
LivePerson
LPSN
$22M
| $160K | ﹤0.01% |
10,567
-3,986
| -27% | -$47.1K |
|
4743
Tronox
TROX
$967M
| $160K | ﹤0.01% |
+31,563
| New | +$172K |
|
4744
CALL
Adient
ADNT
$1.69B
| $159K | ﹤0.01% |
8,200
-27,600
| -77% | -$408K |
|
4745
CALL
AngioDynamics
ANGO
$605M
| $159K | ﹤0.01% |
16,100
+11,200
| +229% | +$110K |
|
|
BORR
4746
Borr Drilling
BORR
$1.19B
| $159K | ﹤0.01% |
87,205
-5,068
| -5% | -$9.57K |
|
4747
iShares MSCI Italy ETF
EWI
$987M
| $159K | ﹤0.01% |
3,307
+2,597
| +366% | +$117K |
|
4748
CALL
Icon
ICLR
$13.7B
| $159K | ﹤0.01% |
1,100
-1,600
| -59% | -$227K |
|
4749
CALL
Outfront Media
OUT
$5.75B
| $159K | ﹤0.01% |
9,800
-24,100
| -71% | -$377K |
|
4750
CALL
Praxis Precision Medicines
PRAX
$8.11B
| $159K | ﹤0.01% |
3,800
-6,900
| -64% | -$263K |
|
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.