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 | |
|---|---|---|---|---|---|---|
76
PUT
Cisco
CSCO
$445B
| $243M | 0.12% |
3,558,400
+446,000
| +14% | +$30.4M |
|
|
UWC
77
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $240M | 0.12% |
2,313,900
+411,100
| +22% | +$42.6M |
|
78
CALL
JPMorgan Chase
JPM
$925B
| $239M | 0.12% |
757,500
-244,300
| -24% | -$72.7M |
|
|
79
Microsoft
MSFT
$2.89T
| $237M | 0.12% |
+458,309
| New | +$234M |
|
80
CALL
Nike
NKE
$62.5B
| $237M | 0.12% |
3,393,300
+97,400
| +3% | +$7.26M |
|
|
CRWV
81
PUT
CoreWeave
CRWV
$45.5B
| $233M | 0.12% |
1,699,300
+272,700
| +19% | +$32.3M |
|
82
PUT
Wolfspeed
WOLF
$1.59B
| $222M | 0.11% |
7,772,900
+4,129,700
| +113% | +$9.68M |
|
|
83
CALL
Pinduoduo
PDD
$119B
| $221M | 0.11% |
1,669,900
-215,700
| -11% | -$25.5M |
|
84
CALL
iShares Morningstar Value ETF
ILCV
$1.3B
| $219M | 0.11% |
2,742,000
+1,612,900
| +143% | +$140M |
|
85
PUT
Iris Energy
IREN
$15.2B
| $217M | 0.11% |
4,617,000
+1,259,600
| +38% | +$30.6M |
|
86
CALL
Salesforce
CRM
$135B
| $216M | 0.11% |
910,700
+187,000
| +26% | +$47.2M |
|
87
CALL
ASML
ASML
$694B
| $209M | 0.11% |
215,900
+32,000
| +17% | +$25.2M |
|
|
KFYP
88
CALL
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $205M | 0.11% |
5,147,200
+1,985,400
| +63% | +$79M |
|
89
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46.2B
| $199M | 0.1% |
428,200
-65,800
| -13% | -$29.7M |
|
90
CALL
CrowdStrike
CRWD
$191B
| $197M | 0.1% |
1,609,200
-173,600
| -10% | -$19.7M |
|
91
CALL
Uber
UBER
$144B
| $191M | 0.1% |
1,948,200
-67,900
| -3% | -$6.35M |
|
92
PUT
Bank of America
BAC
$433B
| $188M | 0.1% |
4,142,800
-1,007,300
| -20% | -$49.1M |
|
93
CALL
Walmart Inc
WMT
$868B
| $188M | 0.1% |
1,821,400
-403,900
| -18% | -$40.2M |
|
94
CALL
IBM
IBM
$197B
| $188M | 0.1% |
664,700
+261,000
| +65% | +$68.3M |
|
|
95
CALL
Bank of America
BAC
$433B
| $186M | 0.1% |
3,604,900
-271,300
| -7% | -$13.2M |
|
96
CALL
PayPal
PYPL
$49.1B
| $184M | 0.09% |
2,737,200
+335,600
| +14% | +$23.7M |
|
|
97
PUT
Nike
NKE
$62.5B
| $183M | 0.09% |
2,621,200
-1,214,800
| -32% | -$90.5M |
|
98
PUT
Eli Lilly
LLY
$1.04T
| $182M | 0.09% |
238,700
-67,900
| -22% | -$50.5M |
|
|
99
PUT
Walmart Inc
WMT
$868B
| $182M | 0.09% |
1,763,000
-239,300
| -12% | -$23.8M |
|
|
100
CALL
Eli Lilly
LLY
$1.04T
| $180M | 0.09% |
235,300
-159,800
| -40% | -$119M |
|
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.