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 | |
|---|---|---|---|---|---|---|
7576
Republic Bancorp
RBCAA
$1.84B
| $7K | ﹤0.01% |
+100
| New | +$6.84K |
|
|
7577
PUT
Republic Bancorp
RBCAA
$1.84B
| $7K | ﹤0.01% |
+100
| New | +$6.84K |
|
7578
PUT
RLI Corp
RLI
$5.68B
| $7K | ﹤0.01% |
+100
| New | +$7.5K |
|
7579
CALL
Rimini Street
RMNI
$408M
| $7K | ﹤0.01% |
1,900
-1,400
| -42% | -$4.68K |
|
7580
PUT
Satellogic
SATL
$532M
| $7K | ﹤0.01% |
2,200
+1,500
| +214% | +$5.66K |
|
7581
CALL
SK Telecom
SKM
$13.7B
| $7K | ﹤0.01% |
300
+100
| +50% | +$2.15K |
|
|
SLN
7582
PUT
Silence Therapeutics
SLN
$521M
| $7K | ﹤0.01% |
+1,300
| New | +$5.57K |
|
7583
CALL
Spire
SR
$4.92B
| $7K | ﹤0.01% |
100
-800
| -89% | -$59.9K |
|
|
7584
PUT
Spire
SR
$4.92B
| $7K | ﹤0.01% |
+100
| New | +$7.49K |
|
7585
Theravance Biopharma
TBPH
$874M
| $7K | ﹤0.01% |
697
+591
| +558% | +$5.75K |
|
7586
PUT
ThredUp
TDUP
$736M
| $7K | ﹤0.01% |
1,000
-2,100
| -68% | -$12.3K |
|
|
TERN
7587
PUT
DELISTED
Terns Pharmaceuticals
TERN
| $7K | ﹤0.01% |
2,100
-400
| -16% | -$1.25K |
|
7588
PUT
Tecnoglass
TGLS
$2.01B
| $7K | ﹤0.01% |
+100
| New | +$7.76K |
|
7589
TIM SA
TIMB
$10.2B
| $7K | ﹤0.01% |
+380
| New | +$6.5K |
|
7590
PUT
Timken Company
TKR
$9.82B
| $7K | ﹤0.01% |
100
-300
| -75% | -$20.4K |
|
7591
CALL
Tenaya Therapeutics
TNYA
$168M
| $7K | ﹤0.01% |
11,600
-800
| -6% | -$407 |
|
7592
PUT
Turning Point Brands
TPB
$1.47B
| $7K | ﹤0.01% |
100
-700
| -88% | -$47.6K |
|
7593
Terreno Realty
TRNO
$7.68B
| $7K | ﹤0.01% |
+140
| New | +$8.01K |
|
7594
Taysha Gene Therapies
TSHA
$1.59B
| $7K | ﹤0.01% |
+3,263
| New | +$7.09K |
|
|
TURN
7595
PUT
DELISTED
180 Degree Capital
TURN
| $7K | ﹤0.01% |
+2,000
| New | +$7.82K |
|
|
UDMY
7596
PUT
DELISTED
Udemy
UDMY
| $7K | ﹤0.01% |
1,100
-1,600
| -59% | -$11K |
|
7597
Universal Electronics
UEIC
$57.2M
| $7K | ﹤0.01% |
1,074
+139
| +15% | +$849 |
|
7598
PUT
Weis Markets
WMK
$1.82B
| $7K | ﹤0.01% |
100
| – | – |
|
7599
CALL
Westwater Resources
WWR
$51M
| $7K | ﹤0.01% |
+13,100
| New | +$6.89K |
|
|
YRD
7600
CALL
Yiren Digital
YRD
$103M
| $7K | ﹤0.01% |
1,300
-1,100
| -46% | -$6.92K |
|
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.