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 | |
|---|---|---|---|---|---|---|
1201
PUT
Brookfield Asset Management
BAM
$72.9B
| $6.1M | ﹤0.01% |
110,400
+83,100
| +304% | +$4.46M |
|
1202
CALL
SSR Mining
SSRM
$5.62B
| $6.1M | ﹤0.01% |
478,700
+70,900
| +17% | +$799K |
|
1203
PUT
Joby Aviation
JOBY
$7.03B
| $6.07M | ﹤0.01% |
575,300
+340,700
| +145% | +$2.47M |
|
1204
CALL
Bitdeer Technologies
BTDR
$2.77B
| $6.07M | ﹤0.01% |
528,400
-192,100
| -27% | -$2.22M |
|
|
SHNY
1205
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $6.06M | ﹤0.01% |
834,600
+140,600
| +20% | +$1.02M |
|
|
SLNO
1206
CALL
DELISTED
Soleno Therapeutics
SLNO
| $6.05M | ﹤0.01% |
72,200
-110,100
| -60% | -$8.24M |
|
1207
PUT
Kratos Defense & Security Solutions
KTOS
$9.02B
| $6.04M | ﹤0.01% |
130,100
+60,200
| +86% | +$2.18M |
|
1208
Dollar General
DG
$25.8B
| $6.04M | ﹤0.01% |
52,823
-29,472
| -36% | -$2.93M |
|
|
VTLE
1209
CALL
DELISTED
Vital Energy
VTLE
| $6.03M | ﹤0.01% |
374,900
+346,500
| +1,220% | +$5.67M |
|
|
CTRA
1210
CALL
DELISTED
Coterra Energy
CTRA
| $6.01M | ﹤0.01% |
236,900
-53,600
| -18% | -$1.36M |
|
1211
PUT
Bath & Body Works
BBWI
$3.91B
| $6.01M | ﹤0.01% |
200,500
-192,100
| -49% | -$5.62M |
|
1212
CALL
Hormel Foods
HRL
$13.9B
| $5.99M | ﹤0.01% |
198,000
+14,000
| +8% | +$422K |
|
1213
CALL
AES
AES
$10.6B
| $5.98M | ﹤0.01% |
568,400
+12,300
| +2% | +$132K |
|
1214
CALL
Doximity
DOCS
$3.71B
| $5.97M | ﹤0.01% |
97,300
-40,700
| -29% | -$2.27M |
|
1215
PUT
Mobileye
MBLY
$6.64B
| $5.95M | ﹤0.01% |
331,100
-185,300
| -36% | -$2.83M |
|
1216
PUT
BioNTech
BNTX
$23B
| $5.95M | ﹤0.01% |
55,900
+1,800
| +3% | +$182K |
|
1217
CALL
Colgate-Palmolive
CL
$72.6B
| $5.94M | ﹤0.01% |
65,400
-47,500
| -42% | -$4.34M |
|
|
PARA
1218
PUT
DELISTED
Paramount Global Class B
PARA
| $5.93M | ﹤0.01% |
460,000
-24,300
| -5% | -$284K |
|
1219
Core Scientific
CORZ
$7.28B
| $5.92M | ﹤0.01% |
346,801
+195,850
| +130% | +$1.96M |
|
|
AL
1220
DELISTED
Air Lease Corp
AL
| $5.91M | ﹤0.01% |
101,068
+96,548
| +2,136% | +$5.03M |
|
1221
CALL
Restaurant Brands International
QSR
$25.3B
| $5.9M | ﹤0.01% |
89,000
-159,700
| -64% | -$10.7M |
|
|
1222
AES
AES
$10.6B
| $5.9M | ﹤0.01% |
560,576
+268,614
| +92% | +$2.88M |
|
1223
iShares National Muni Bond ETF
MUB
$45.1B
| $5.9M | ﹤0.01% |
56,446
-21,501
| -28% | -$2.24M |
|
1224
PUT
Ball Corp
BALL
$16.7B
| $5.88M | ﹤0.01% |
104,900
+58,200
| +125% | +$3.04M |
|
1225
PUT
Conagra Brands
CAG
$7B
| $5.88M | ﹤0.01% |
287,400
+220,900
| +332% | +$5.18M |
|
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.