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 | |
|---|---|---|---|---|---|---|
5801
PUT
Hayward Holdings
HAYW
$3.21B
| $95K | ﹤0.01% |
6,300
+500
| +9% | +$7.66K |
|
5802
FT Vest Gold Strategy Target Income ETF
IGLD
$509M
| $95K | ﹤0.01% |
+3,989
| New | +$88.9K |
|
|
JFIN
5803
PUT
Jiayin Group
JFIN
$113M
| $95K | ﹤0.01% |
9,300
-11,800
| -56% | -$161K |
|
5804
PUT
Comstock
LODE
$208M
| $95K | ﹤0.01% |
28,500
-200
| -0.7% | -$623 |
|
5805
Markel Group
MKL
$23.3B
| $95K | ﹤0.01% |
+50
| New | +$98K |
|
5806
NewAmsterdam Pharma
NAMS
$3.25B
| $95K | ﹤0.01% |
3,372
-2,232
| -40% | -$53.5K |
|
5807
Nabors Industries
NBR
$1.27B
| $95K | ﹤0.01% |
+2,330
| New | +$83K |
|
5808
CALL
Star Group
SGU
$412M
| $95K | ﹤0.01% |
8,100
+7,800
| +2,600% | +$91.1K |
|
5809
CALL
Takeda Pharmaceutical
TAK
$54.6B
| $95K | ﹤0.01% |
6,500
-9,300
| -59% | -$138K |
|
|
LIF
5810
CALL
Life360
LIF
$4.38B
| $95K | ﹤0.01% |
900
+600
| +200% | +$50.5K |
|
|
LTM
5811
CALL
LATAM Airlines Group S.A.
LTM
$15.1B
| $95K | ﹤0.01% |
+2,100
| New | +$94.4K |
|
|
SFD
5812
Smithfield Foods
SFD
$10.2B
| $95K | ﹤0.01% |
+4,085
| New | +$99.8K |
|
5813
CALL
ALX Oncology
ALXO
$261M
| $94K | ﹤0.01% |
51,900
-11,700
| -18% | -$10.1K |
|
5814
PUT
Ardagh Metal Packaging
AMBP
$2.83B
| $94K | ﹤0.01% |
23,700
+5,000
| +27% | +$19.9K |
|
5815
CALL
Cincinnati Financial
CINF
$27.3B
| $94K | ﹤0.01% |
600
-200
| -25% | -$30.4K |
|
5816
CALL
IHS Holding
IHS
$2.76B
| $94K | ﹤0.01% |
13,900
-4,500
| -24% | -$30.1K |
|
5817
CALL
INmune Bio
INMB
$46.5M
| $94K | ﹤0.01% |
45,700
-26,000
| -36% | -$59.5K |
|
5818
PUT
Marqeta
MQ
$1.83B
| $94K | ﹤0.01% |
4,475
-100
| -2% | -$2.37K |
|
5819
CALL
Meritage Homes
MTH
$4.58B
| $94K | ﹤0.01% |
1,300
+300
| +30% | +$22.3K |
|
5820
Outlook Therapeutics
OTLK
$183M
| $94K | ﹤0.01% |
+89,241
| New | +$154K |
|
5821
PUT
Phathom Pharmaceuticals
PHAT
$708M
| $94K | ﹤0.01% |
8,000
-191,200
| -96% | -$1.97M |
|
5822
Perella Weinberg Partners
PWP
$1.29B
| $94K | ﹤0.01% |
+4,426
| New | +$94.6K |
|
|
RPC
5823
PUT
Ridgepost Capital
RPC
$949M
| $94K | ﹤0.01% |
8,700
+6,000
| +222% | +$71.3K |
|
5824
Supernus Pharmaceuticals
SUPN
$2.59B
| $94K | ﹤0.01% |
+1,981
| New | +$79.8K |
|
5825
Tarsus Pharmaceuticals
TARS
$2.58B
| $94K | ﹤0.01% |
+1,594
| New | +$78.5K |
|
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.