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 | |
|---|---|---|---|---|---|---|
1176
CALL
Red Cat Holdings
RCAT
$1.18B
| $7.25M | ﹤0.01% |
700,400
+144,700
| +26% | +$1.35M |
|
1177
PUT
Capri Holdings
CPRI
$1.8B
| $7.23M | ﹤0.01% |
363,100
+219,200
| +152% | +$4.4M |
|
1178
PUT
Wingstop
WING
$3.84B
| $7.22M | ﹤0.01% |
28,700
-9,600
| -25% | -$2.98M |
|
|
MPT
1179
CALL
Medical Properties Trust
MPT
$2.89B
| $7.21M | ﹤0.01% |
1,422,200
-507,000
| -26% | -$2.23M |
|
|
ECHO
1180
EchoStar
ECHO
$25.5B
| $7.2M | ﹤0.01% |
94,286
+72,495
| +333% | +$3.28M |
|
1181
CALL
POET Technologies
POET
$1.22B
| $7.19M | ﹤0.01% |
1,298,100
+458,200
| +55% | +$2.59M |
|
1182
PUT
Valaris
VAL
$5.51B
| $7.18M | ﹤0.01% |
147,200
-44,900
| -23% | -$2.19M |
|
1183
CALL
GDS Holdings
GDS
$6.4B
| $7.16M | ﹤0.01% |
185,100
+19,700
| +12% | +$698K |
|
1184
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$430M
| $7.16M | ﹤0.01% |
202,300
-66,150
| -25% | -$4.51M |
|
1185
ARK 21Shares Bitcoin ETF
ARKB
$2.44B
| $7.12M | ﹤0.01% |
187,268
-13,696
| -7% | -$521K |
|
|
JPGE
1186
PUT
DELISTED
JPMorgan Diversified Return Global Equity ETF
JPGE
| $7.11M | ﹤0.01% |
124,500
+93,300
| +299% | +$5.33M |
|
1187
PUT
SAP
SAP
$185B
| $7.11M | ﹤0.01% |
26,600
+6,200
| +30% | +$1.74M |
|
1188
CALL
AstraZeneca
AZN
$261B
| $7.09M | ﹤0.01% |
46,200
-59,000
| -56% | -$8.93M |
|
1189
PUT
Canadian Natural Resources
CNQ
$97B
| $7.08M | ﹤0.01% |
221,400
+85,700
| +63% | +$2.68M |
|
|
KEEL
1190
CALL
Keel Infrastructure Corp
KEEL
$2.72B
| $7.06M | ﹤0.01% |
2,504,600
+1,814,700
| +263% | +$2.81M |
|
1191
PUT
monday.com
MNDY
$3.24B
| $7.01M | ﹤0.01% |
36,200
+25,900
| +251% | +$5.96M |
|
1192
PUT
Trip.com Group
TCOM
$27.7B
| $6.98M | ﹤0.01% |
92,800
-84,000
| -48% | -$5.61M |
|
|
MRP
1193
PUT
Millrose Properties Inc
MRP
$4.76B
| $6.97M | ﹤0.01% |
207,500
+144,000
| +227% | +$4.65M |
|
1194
PUT
Mondelez International
MDLZ
$77.3B
| $6.95M | ﹤0.01% |
111,300
-196,400
| -64% | -$12.7M |
|
1195
CALL
Tilray
TLRY
$478M
| $6.95M | ﹤0.01% |
401,740
+188,850
| +89% | +$1.81M |
|
1196
CALL
Tenet Healthcare
THC
$20.3B
| $6.94M | ﹤0.01% |
34,200
-12,800
| -27% | -$2.27M |
|
1197
CALL
Badger Meter
BMI
$3.68B
| $6.93M | ﹤0.01% |
38,800
+38,100
| +5,443% | +$7.49M |
|
1198
CALL
McEwen Inc
MUX
$1.05B
| $6.92M | ﹤0.01% |
405,000
+112,400
| +38% | +$1.35M |
|
1199
PUT
American International
AIG
$41.7B
| $6.89M | ﹤0.01% |
87,800
-92,600
| -51% | -$7.4M |
|
1200
PUT
Deutsche Bank
DB
$66.7B
| $6.88M | ﹤0.01% |
194,300
-16,800
| -8% | -$573K |
|
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.