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 | |
|---|---|---|---|---|---|---|
4551
PUT
Talos Energy
TALO
$2.38B
| $192K | ﹤0.01% |
22,700
+8,900
| +64% | +$71.3K |
|
|
ETHT
4552
ProShares Ultra Ether ETF
ETHT
$197M
| $192K | ﹤0.01% |
4,885
+4,586
| +1,534% | +$152K |
|
4553
PUT
Arch Capital
ACGL
$36.5B
| $191K | ﹤0.01% |
2,100
+200
| +11% | +$18.5K |
|
4554
PUT
State Street SPDR MSCI Emerging Markets Fossil Fuel Reserves Free ETF
EEMX
$164M
| $191K | ﹤0.01% |
5,100
| – | – |
|
4555
IES Holdings
IESC
$9.89B
| $191K | ﹤0.01% |
+645
| New | +$152K |
|
4556
PUT
Rollins
ROL
$18.6B
| $191K | ﹤0.01% |
3,400
+3,000
| +750% | +$168K |
|
|
SNBR
4557
CALL
DELISTED
Sleep Number
SNBR
| $191K | ﹤0.01% |
28,400
+17,800
| +168% | +$136K |
|
|
ACLX
4558
PUT
DELISTED
Arcellx
ACLX
| $190K | ﹤0.01% |
2,900
+2,500
| +625% | +$156K |
|
4559
Harmony Gold Mining
HMY
$9.7B
| $190K | ﹤0.01% |
+13,663
| New | +$207K |
|
4560
iShares Latin America 40 ETF
ILF
$3.73B
| $190K | ﹤0.01% |
7,279
+5,206
| +251% | +$129K |
|
4561
PUT
Nexstar Media Group
NXST
$6.01B
| $190K | ﹤0.01% |
1,100
-13,100
| -92% | -$2.15M |
|
|
OPRA
4562
PUT
Opera Ltd
OPRA
$1.68B
| $190K | ﹤0.01% |
10,100
+900
| +10% | +$15.4K |
|
4563
CALL
PTC Therapeutics
PTCT
$6.18B
| $190K | ﹤0.01% |
3,900
+1,900
| +95% | +$90.2K |
|
4564
CALL
Arlo Technologies
ARLO
$1.58B
| $189K | ﹤0.01% |
11,200
-6,000
| -35% | -$76.7K |
|
4565
Blink Charging
BLNK
$67.5M
| $189K | ﹤0.01% |
201,900
-14,930
| -7% | -$11.9K |
|
4566
PUT
Cooper-Standard Automotive
CPS
$517M
| $189K | ﹤0.01% |
8,800
-1,500
| -15% | -$28.9K |
|
4567
PUT
Steven Madden
SHOO
$3.17B
| $189K | ﹤0.01% |
7,900
-600
| -7% | -$14.1K |
|
4568
Spire Global
SPIR
$408M
| $189K | ﹤0.01% |
15,890
+7,318
| +85% | +$73.8K |
|
4569
CALL
Teleflex
TFX
$5.96B
| $189K | ﹤0.01% |
1,600
+100
| +7% | +$12.6K |
|
4570
Acuity Brands
AYI
$9.99B
| $188K | ﹤0.01% |
+633
| New | +$164K |
|
4571
Fennec Pharmaceuticals
FENC
$335M
| $188K | ﹤0.01% |
22,710
+22,458
| +8,912% | +$154K |
|
4572
CALL
Genie Energy
GNE
$370M
| $188K | ﹤0.01% |
7,000
+6,900
| +6,900% | +$132K |
|
4573
Lufax Holding
LU
$1.33B
| $188K | ﹤0.01% |
67,423
+45,766
| +211% | +$129K |
|
4574
PUT
Madison Square Garden
MSGS
$9.59B
| $188K | ﹤0.01% |
+900
| New | +$173K |
|
4575
CALL
NewAmsterdam Pharma
NAMS
$3.26B
| $188K | ﹤0.01% |
10,400
+9,600
| +1,200% | +$175K |
|
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.