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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6451
PUT
AGF US Market Neutral Anti-Beta Fund
BTAL
$315M
| $50K | ﹤0.01% |
+3,200
| New | +$52.7K |
|
6452
CALL
CareDx
CDNA
$1.83B
| $50K | ﹤0.01% |
3,500
-24,300
| -87% | -$346K |
|
6453
CALL
CEVA Inc
CEVA
$831M
| $50K | ﹤0.01% |
+1,900
| New | +$44.3K |
|
|
CVAC
6454
PUT
DELISTED
CureVac
CVAC
| $50K | ﹤0.01% |
9,400
-1,000
| -10% | -$5.41K |
|
|
DENN
6455
CALL
DELISTED
Denny's
DENN
| $50K | ﹤0.01% |
9,700
+8,800
| +978% | +$39K |
|
6456
CALL
Encompass Health
EHC
$11.3B
| $50K | ﹤0.01% |
400
-500
| -56% | -$59.5K |
|
6457
PUT
Equitable Holdings
EQH
$13.2B
| $50K | ﹤0.01% |
1,000
-2,600
| -72% | -$138K |
|
6458
PUT
Edgewise Therapeutics
EWTX
$4.28B
| $50K | ﹤0.01% |
3,100
-13,200
| -81% | -$187K |
|
6459
PUT
FormFactor
FORM
$6.51B
| $50K | ﹤0.01% |
1,400
-1,400
| -50% | -$45.1K |
|
6460
CALL
Federal Realty Investment Trust
FRT
$10.9B
| $50K | ﹤0.01% |
500
-3,000
| -86% | -$290K |
|
6461
CALL
Fortis
FTS
$29.3B
| $50K | ﹤0.01% |
1,000
-1,800
| -64% | -$88.5K |
|
6462
PUT
Penumbra
PEN
$12.6B
| $50K | ﹤0.01% |
+200
| New | +$50.4K |
|
6463
CALL
Purple Innovation
PRPL
$34.5M
| $50K | ﹤0.01% |
2,148
+132
| +7% | +$3.09K |
|
6464
CALL
Q2 Holdings
QTWO
$3.78B
| $50K | ﹤0.01% |
700
-3,300
| -83% | -$271K |
|
6465
CALL
Shinhan Financial Group
SHG
$32.1B
| $50K | ﹤0.01% |
1,000
+500
| +100% | +$24.5K |
|
6466
CALL
SunCoke Energy
SXC
$794M
| $50K | ﹤0.01% |
6,200
+3,500
| +130% | +$27.9K |
|
|
6467
SunCoke Energy
SXC
$794M
| $50K | ﹤0.01% |
6,233
+3,787
| +155% | +$30.2K |
|
6468
CALL
Triumph Financial Inc
TFIN
$1.81B
| $50K | ﹤0.01% |
1,000
-4,800
| -83% | -$283K |
|
6469
CALL
VinFast Auto
VFS
$7.02B
| $50K | ﹤0.01% |
15,600
-1,900
| -11% | -$6.51K |
|
6470
Telefônica Brasil
VIV
$20.4B
| $50K | ﹤0.01% |
3,973
+831
| +26% | +$9.96K |
|
|
ETHD
6471
ProShares UltraShort Ether ETF
ETHD
$48.6M
| $50K | ﹤0.01% |
+1,380
| New | +$77.1K |
|
6472
Asbury Automotive
ABG
$4.62B
| $49K | ﹤0.01% |
+203
| New | +$49.3K |
|
6473
Caribou Biosciences
CRBU
$146M
| $49K | ﹤0.01% |
+21,123
| New | +$39.9K |
|
6474
PUT
iMGP DBi Managed Futures Strategy ETF
DBMF
$4B
| $49K | ﹤0.01% |
+1,800
| New | +$47.1K |
|
6475
CALL
Denali Therapeutics
DNLI
$3.79B
| $49K | ﹤0.01% |
3,400
-3,100
| -48% | -$44.5K |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.