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 | |
|---|---|---|---|---|---|---|
3526
PUT
Korn Ferry
KFY
$4.13B
| $491K | ﹤0.01% |
6,700
+6,600
| +6,600% | +$440K |
|
3527
PUT
Willis Towers Watson
WTW
$28.6B
| $490K | ﹤0.01% |
1,600
-15,900
| -91% | -$4.93M |
|
3528
CALL
i3 Verticals
IIIV
$404M
| $489K | ﹤0.01% |
17,800
+16,400
| +1,171% | +$411K |
|
3529
CALL
Sagimet Biosciences
SGMT
$460M
| $489K | ﹤0.01% |
64,300
+26,700
| +71% | +$113K |
|
3530
PUT
Spero Therapeutics
SPRO
$68.3M
| $489K | ﹤0.01% |
168,800
+165,700
| +5,345% | +$238K |
|
3531
PUT
Innoviz Technologies
INVZ
$139M
| $488K | ﹤0.01% |
297,900
-70,700
| -19% | -$61.8K |
|
3532
PUT
Perrigo
PRGO
$1.4B
| $488K | ﹤0.01% |
18,300
-3,600
| -16% | -$94.3K |
|
3533
CALL
USA Compression Partners
USAC
$3.72B
| $488K | ﹤0.01% |
20,100
+4,400
| +28% | +$109K |
|
|
ACB
3534
PUT
Aurora Cannabis
ACB
$170M
| $487K | ﹤0.01% |
114,900
-17,600
| -13% | -$85.3K |
|
3535
CALL
Clearway Energy Class C
CWEN
$5B
| $487K | ﹤0.01% |
15,600
+700
| +5% | +$20.9K |
|
3536
Roivant Sciences
ROIV
$25B
| $487K | ﹤0.01% |
43,256
-72,948
| -63% | -$791K |
|
3537
Alaska Air
ALK
$5.3B
| $486K | ﹤0.01% |
9,829
-1,502
| -13% | -$73K |
|
3538
CALL
Cogent Communications
CCOI
$612M
| $486K | ﹤0.01% |
10,100
-4,100
| -29% | -$208K |
|
3539
PUT
Nordic American Tanker
NAT
$1.37B
| $486K | ﹤0.01% |
185,000
+14,900
| +9% | +$38.9K |
|
3540
Gartner
IT
$9.87B
| $485K | ﹤0.01% |
1,200
-5,954
| -83% | -$2.49M |
|
3541
ProShares UltraShort S&P500
SDS
$424M
| $485K | ﹤0.01% |
5,835
+4,543
| +352% | +$451K |
|
3542
CALL
Visteon
VC
$2.82B
| $485K | ﹤0.01% |
5,200
+100
| +2% | +$8.23K |
|
3543
CALL
Aegon
AEG
$13.5B
| $484K | ﹤0.01% |
66,900
+55,900
| +508% | +$374K |
|
3544
APA Corp
APA
$12.3B
| $483K | ﹤0.01% |
26,431
-418
| -2% | -$7.25K |
|
3545
Neurocrine Biosciences
NBIX
$17.7B
| $483K | ﹤0.01% |
3,843
+1,443
| +60% | +$165K |
|
3546
Amplify Cybersecurity ETF
HACK
$2.65B
| $482K | ﹤0.01% |
5,583
+876
| +19% | +$68.2K |
|
|
DFDV
3547
PUT
DeFi Development Corp
DFDV
$82.2M
| $482K | ﹤0.01% |
+24,750
| New | +$356K |
|
3548
CALL
UWM Holdings
UWMC
$624M
| $482K | ﹤0.01% |
116,600
+55,000
| +89% | +$242K |
|
3549
Direxion Daily Junior Gold Miners Index Bull 2X ETF
JNUG
$378M
| $481K | ﹤0.01% |
+6,063
| New | +$435K |
|
|
CGAU
3550
Centerra Gold
CGAU
$3.27B
| $480K | ﹤0.01% |
66,696
+57,199
| +602% | +$391K |
|
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.