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 | |
|---|---|---|---|---|---|---|
5101
PUT
OGE Energy
OGE
$9.78B
| $175K | ﹤0.01% |
3,800
-5,800
| -60% | -$260K |
|
5102
Piper Sandler
PIPR
$5.07B
| $175K | ﹤0.01% |
+2,024
| New | +$165K |
|
5103
Astera Labs
ALAB
$53.6B
| $175K | ﹤0.01% |
+896
| New | +$147K |
|
|
TGR
5104
CALL
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $175K | ﹤0.01% |
2,300
-100
| -4% | -$7.61K |
|
|
OSG
5105
Octave Specialty Group
OSG
$246M
| $174K | ﹤0.01% |
20,878
-10,341
| -33% | -$87.4K |
|
5106
CALL
ASE Group
ASX
$78B
| $174K | ﹤0.01% |
15,700
-15,800
| -50% | -$165K |
|
5107
Community Health Systems
CYH
$382M
| $174K | ﹤0.01% |
54,478
-58,834
| -52% | -$177K |
|
|
DRD
5108
DRDGold
DRD
$1.76B
| $174K | ﹤0.01% |
6,338
+6,025
| +1,925% | +$108K |
|
5109
Fidelity MSCI Utilities Index ETF
FUTY
$2.31B
| $174K | ﹤0.01% |
+3,093
| New | +$169K |
|
5110
KraneShares California Carbon Allowance Strategy ETF
KCCA
$113M
| $174K | ﹤0.01% |
10,233
+9,648
| +1,649% | +$154K |
|
5111
PUT
OneWater Marine
ONEW
$200M
| $174K | ﹤0.01% |
11,000
+10,800
| +5,400% | +$171K |
|
5112
RXO
RXO
$3.36B
| $174K | ﹤0.01% |
11,350
+7,103
| +167% | +$114K |
|
5113
Utz Brands
UTZ
$1.25B
| $174K | ﹤0.01% |
+14,364
| New | +$190K |
|
5114
Abeona Therapeutics
ABEO
$361M
| $173K | ﹤0.01% |
32,772
+25,321
| +340% | +$161K |
|
5115
CALL
Banco Macro
BMA
$5.95B
| $173K | ﹤0.01% |
4,100
-2,300
| -36% | -$141K |
|
|
CPRX
5116
PUT
DELISTED
Catalyst Pharmaceutical
CPRX
| $173K | ﹤0.01% |
8,800
+800
| +10% | +$16.5K |
|
5117
Direxion Daily Gold Miners Index Bear 2X ETF
DUST
$71.4M
| $173K | ﹤0.01% |
1,592
-1,216
| -43% | -$231K |
|
5118
PUT
IMAX
IMAX
$2.59B
| $173K | ﹤0.01% |
5,300
+5,200
| +5,200% | +$147K |
|
5119
CALL
Kennametal
KMT
$2.54B
| $173K | ﹤0.01% |
8,300
+6,900
| +493% | +$155K |
|
5120
CALL
Karyopharm Therapeutics
KPTI
$51M
| $173K | ﹤0.01% |
26,600
+26,000
| +4,333% | +$140K |
|
5121
Materion
MTRN
$4.31B
| $173K | ﹤0.01% |
+1,434
| New | +$151K |
|
|
5122
PUT
Piper Sandler
PIPR
$5.07B
| $173K | ﹤0.01% |
2,000
-800
| -29% | -$65.2K |
|
|
ARIS
5123
CALL
Aris Mining
ARIS
$2.81B
| $172K | ﹤0.01% |
17,600
+16,100
| +1,073% | +$128K |
|
|
STEX
5124
CALL
Streamex Corp
STEX
$74M
| $172K | ﹤0.01% |
+30,000
| New | +$163K |
|
5125
CALL
CrossAmerica Partners
CAPL
$833M
| $172K | ﹤0.01% |
8,200
+3,700
| +82% | +$77.4K |
|
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.