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 | |
|---|---|---|---|---|---|---|
951
PUT
MGM Resorts International
MGM
$11.5B
| $9.09M | 0.01% |
264,400
-67,600
| -20% | -$2.14M |
|
952
PUT
BWX Technologies
BWXT
$16.2B
| $9.06M | 0.01% |
62,900
+30,700
| +95% | +$3.59M |
|
953
PUT
Ferguson
FERG
$44.3B
| $9.06M | 0.01% |
41,600
-1,700
| -4% | -$313K |
|
|
HUT
954
PUT
Hut 8
HUT
$13.2B
| $9.05M | 0.01% |
486,600
+292,100
| +150% | +$4.36M |
|
955
CALL
Viking Therapeutics
VKTX
$4.11B
| $9.04M | 0.01% |
341,300
+54,600
| +19% | +$1.44M |
|
956
CALL
Prudential Financial
PRU
$40.9B
| $9.04M | 0.01% |
84,100
+3,900
| +5% | +$404K |
|
957
CALL
AngloGold Ashanti
AU
$39.7B
| $9.03M | 0.01% |
198,200
-79,200
| -29% | -$3.41M |
|
958
PUT
HubSpot
HUBS
$9.73B
| $9.02M | 0.01% |
16,200
+12,600
| +350% | +$7.38M |
|
959
CALL
FTAI Aviation
FTAI
$22.2B
| $8.97M | 0.01% |
78,000
-4,800
| -6% | -$537K |
|
960
CALL
Vodafone
VOD
$35.1B
| $8.9M | 0.01% |
835,200
+34,000
| +4% | +$329K |
|
961
PUT
Realty Income
O
$60.4B
| $8.89M | 0.01% |
154,400
-13,700
| -8% | -$775K |
|
962
PUT
Align Technology
ALGN
$12B
| $8.88M | 0.01% |
46,900
+4,100
| +10% | +$724K |
|
963
PUT
Chubb
CB
$137B
| $8.87M | 0.01% |
30,600
-35,500
| -54% | -$10.2M |
|
964
PUT
HSBC
HSBC
$349B
| $8.83M | 0.01% |
145,300
-92,800
| -39% | -$5.28M |
|
965
PUT
Quest Diagnostics
DGX
$25.2B
| $8.82M | 0.01% |
49,100
+4,600
| +10% | +$799K |
|
966
CALL
QuantumScape Corp
QS
$3.15B
| $8.81M | 0.01% |
1,311,900
+506,600
| +63% | +$2.14M |
|
967
PUT
Unilever
UL
$130B
| $8.79M | 0.01% |
127,733
+62,844
| +97% | +$4.41M |
|
968
PUT
First Majestic Silver
AG
$8.12B
| $8.77M | 0.01% |
1,060,900
+97,200
| +10% | +$654K |
|
969
CALL
Baker Hughes
BKR
$55.6B
| $8.77M | 0.01% |
228,800
+76,400
| +50% | +$2.88M |
|
|
970
PUT
Prudential Financial
PRU
$40.9B
| $8.77M | 0.01% |
81,600
+11,900
| +17% | +$1.23M |
|
|
971
CALL
HubSpot
HUBS
$9.73B
| $8.74M | 0.01% |
15,700
+600
| +4% | +$351K |
|
972
PUT
Gold Fields
GFI
$28.9B
| $8.73M | 0.01% |
368,800
+90,700
| +33% | +$2.08M |
|
973
CALL
Hertz
HTZ
$603M
| $8.71M | 0.01% |
1,275,200
-150,700
| -11% | -$941K |
|
974
CALL
SolarEdge
SEDG
$2.75B
| $8.7M | 0.01% |
426,700
+1,100
| +0.3% | +$18.2K |
|
975
CALL
Match Group
MTCH
$8.72B
| $8.7M | 0.01% |
281,600
+12,500
| +5% | +$374K |
|
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.