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 | |
|---|---|---|---|---|---|---|
1326
PUT
Sanmina
SANM
$11.2B
| $5.82M | ﹤0.01% |
+50,600
| New | +$5.69M |
|
1327
CALL
Whirlpool
WHR
$2.42B
| $5.82M | ﹤0.01% |
74,100
-19,500
| -21% | -$1.79M |
|
1328
PUT
Edwards Lifesciences
EW
$47.6B
| $5.82M | ﹤0.01% |
74,800
-61,300
| -45% | -$4.79M |
|
1329
PUT
The GEO Group
GEO
$4.13B
| $5.82M | ﹤0.01% |
283,900
-36,000
| -11% | -$822K |
|
1330
CALL
PNC Financial Services
PNC
$100B
| $5.81M | ﹤0.01% |
28,900
-2,100
| -7% | -$415K |
|
1331
PUT
Tractor Supply
TSCO
$16.3B
| $5.8M | ﹤0.01% |
102,000
-3,700
| -4% | -$218K |
|
|
TPC
1332
CALL
Tutor Perini Cor
TPC
$4.57B
| $5.79M | ﹤0.01% |
88,300
+55,000
| +165% | +$3.06M |
|
1333
PUT
Vanguard Consumer Discretionary ETF
VCR
$5.84B
| $5.78M | ﹤0.01% |
11,900
+4,000
| +51% | +$1.52M |
|
1334
CALL
Navitas Semiconductor
NVTS
$2.66B
| $5.78M | ﹤0.01% |
800,400
-178,000
| -18% | -$1.19M |
|
|
UCD
1335
CALL
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $5.77M | ﹤0.01% |
106,700
-15,700
| -13% | -$849K |
|
1336
Thermo Fisher Scientific
TMO
$211B
| $5.76M | ﹤0.01% |
11,871
+10,002
| +535% | +$4.66M |
|
1337
CALL
Digital Realty Trust
DLR
$73.7B
| $5.76M | ﹤0.01% |
33,300
+4,900
| +17% | +$838K |
|
|
EXAS
1338
CALL
DELISTED
Exact Sciences
EXAS
| $5.75M | ﹤0.01% |
105,200
+39,100
| +59% | +$1.95M |
|
1339
CALL
Consolidated Edison
ED
$41.6B
| $5.75M | ﹤0.01% |
57,200
-5,000
| -8% | -$502K |
|
|
ETHE
1340
Grayscale Ethereum Staking ETF Shares
ETHE
$1.51B
| $5.75M | ﹤0.01% |
167,765
+127,292
| +315% | +$4.12M |
|
1341
CALL
Plains All American Pipeline
PAA
$17.4B
| $5.74M | ﹤0.01% |
336,700
-262,900
| -44% | -$4.71M |
|
|
SLNO
1342
CALL
DELISTED
Soleno Therapeutics
SLNO
| $5.73M | ﹤0.01% |
84,800
+12,600
| +17% | +$934K |
|
1343
CALL
BlackBerry
BB
$5.01B
| $5.73M | ﹤0.01% |
1,174,400
+320,200
| +37% | +$1.27M |
|
1344
CALL
Fidelity National Information Services
FIS
$21.5B
| $5.73M | ﹤0.01% |
86,900
-19,600
| -18% | -$1.43M |
|
1345
PUT
Baker Hughes
BKR
$56.8B
| $5.73M | ﹤0.01% |
117,600
+42,200
| +56% | +$1.86M |
|
1346
PUT
Nektar Therapeutics
NKTR
$2.39B
| $5.72M | ﹤0.01% |
100,600
-107,100
| -52% | -$3.54M |
|
|
SA
1347
CALL
Seabridge Gold
SA
$2.8B
| $5.72M | ﹤0.01% |
237,000
+46,700
| +25% | +$808K |
|
1348
CALL
WIX.com
WIX
$2.15B
| $5.72M | ﹤0.01% |
32,200
+12,800
| +66% | +$1.93M |
|
1349
CALL
Magna International
MGA
$17.9B
| $5.71M | ﹤0.01% |
120,600
+19,400
| +19% | +$855K |
|
1350
PUT
Rithm Capital
RITM
$5.09B
| $5.71M | ﹤0.01% |
501,700
+335,300
| +202% | +$4.06M |
|
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.