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 | |
|---|---|---|---|---|---|---|
1026
PUT
Symbotic
SYM
$5.16B
| $9.17M | ﹤0.01% |
170,200
+51,500
| +43% | +$2.6M |
|
1027
Direxion Daily TSLA Bull 2X ETF
TSLL
$2.55B
| $9.15M | ﹤0.01% |
433,696
-382,936
| -47% | -$5.19M |
|
1028
CALL
TripAdvisor
TRIP
$1.57B
| $9.14M | ﹤0.01% |
562,200
-45,700
| -8% | -$797K |
|
1029
CALL
Ally Financial
ALLY
$13.4B
| $9.13M | ﹤0.01% |
232,900
+58,200
| +33% | +$2.33M |
|
1030
Warner Bros
WBD
$65.1B
| $9.1M | ﹤0.01% |
465,696
-46,249
| -9% | -$630K |
|
1031
PUT
APA Corp
APA
$12.9B
| $9.09M | ﹤0.01% |
374,400
+15,400
| +4% | +$325K |
|
1032
PUT
Insmed
INSM
$23.3B
| $9.09M | ﹤0.01% |
63,100
-41,900
| -40% | -$5.13M |
|
1033
PUT
Tapestry
TPR
$28.1B
| $9.08M | ﹤0.01% |
80,200
+400
| +0.5% | +$41.9K |
|
1034
CALL
Shift4
FOUR
$3.68B
| $9.07M | ﹤0.01% |
117,200
+39,900
| +52% | +$3.71M |
|
|
EXE
1035
PUT
Expand Energy Corp
EXE
$21.9B
| $9.02M | ﹤0.01% |
84,900
-24,400
| -22% | -$2.45M |
|
1036
PUT
Intercontinental Exchange
ICE
$81B
| $9.01M | ﹤0.01% |
53,500
-3,900
| -7% | -$697K |
|
1037
CALL
American Electric Power
AEP
$73.4B
| $9M | ﹤0.01% |
80,000
-38,300
| -32% | -$4.19M |
|
1038
CALL
Factset
FDS
$8.68B
| $8.99M | ﹤0.01% |
31,400
+28,400
| +947% | +$10.8M |
|
1039
Chipotle Mexican Grill
CMG
$41.1B
| $8.99M | ﹤0.01% |
229,446
-104,552
| -31% | -$4.71M |
|
1040
CALL
UBS Group
UBS
$169B
| $8.97M | ﹤0.01% |
218,700
-23,000
| -10% | -$893K |
|
|
QXO
1041
CALL
QXO Inc
QXO
$14.4B
| $8.96M | ﹤0.01% |
470,200
+103,900
| +28% | +$2.15M |
|
1042
PUT
Ulta Beauty
ULTA
$20.5B
| $8.96M | ﹤0.01% |
29,900
+18,000
| +151% | +$9.22M |
|
1043
Elevance Health
ELV
$82.3B
| $8.91M | ﹤0.01% |
27,588
+26,697
| +2,996% | +$8.3M |
|
1044
PUT
Hecla Mining
HL
$10.3B
| $8.91M | ﹤0.01% |
736,100
+478,500
| +186% | +$3.84M |
|
1045
CALL
Ginkgo Bioworks
DNA
$518M
| $8.89M | ﹤0.01% |
610,000
-207,800
| -25% | -$2.49M |
|
1046
PUT
Bunge Global
BG
$23.7B
| $8.89M | ﹤0.01% |
109,400
+7,600
| +7% | +$609K |
|
1047
iShares MSCI Emerging Markets ETF
EEM
$28.6B
| $8.88M | ﹤0.01% |
166,335
-140,080
| -46% | -$7.03M |
|
1048
PUT
Sarepta Therapeutics
SRPT
$1.68B
| $8.86M | ﹤0.01% |
459,900
+290,500
| +171% | +$5.18M |
|
1049
PUT
Duke Energy
DUK
$101B
| $8.86M | ﹤0.01% |
71,600
-97,500
| -58% | -$11.8M |
|
1050
CALL
Steel Dynamics
STLD
$34.7B
| $8.82M | ﹤0.01% |
63,300
+27,100
| +75% | +$3.56M |
|
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.