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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2901
PUT
Cytokinetics
CYTK
$11B
| $885K | ﹤0.01% |
26,800
-14,500
| -35% | -$504K |
|
2902
CALL
FT Vest Gold Strategy Target Income ETF
IGLD
$507M
| $881K | ﹤0.01% |
15,800
+11,400
| +259% | +$246K |
|
2903
Stratasys
SSYS
$697M
| $881K | ﹤0.01% |
76,811
-9,082
| -11% | -$92.1K |
|
2904
CALL
Tilray
TLRY
$479M
| $881K | ﹤0.01% |
212,890
+62,300
| +41% | +$283K |
|
2905
CALL
Main Street Capital
MAIN
$4.97B
| $880K | ﹤0.01% |
14,900
+7,800
| +110% | +$431K |
|
2906
CALL
Tower Semiconductor
TSEM
$26.4B
| $880K | ﹤0.01% |
20,300
-15,600
| -43% | -$599K |
|
2907
CALL
Scholar Rock
SRRK
$5.71B
| $878K | ﹤0.01% |
24,800
+23,300
| +1,553% | +$731K |
|
2908
PUT
American Water Works
AWK
$26.3B
| $876K | ﹤0.01% |
6,300
-5,400
| -46% | -$774K |
|
2909
Lantheus
LNTH
$6.82B
| $876K | ﹤0.01% |
+10,708
| New | +$940K |
|
2910
CALL
Enviri
NVRI
$621M
| $876K | ﹤0.01% |
101,000
+100,100
| +11,122% | +$734K |
|
|
MGIC
2911
PUT
DELISTED
Magic Software Enterprises
MGIC
| $875K | ﹤0.01% |
45,800
+100
| +0.2% | +$1.5K |
|
2912
PUT
Qfin Holdings
QFIN
$1.61B
| $875K | ﹤0.01% |
20,200
-11,500
| -36% | -$479K |
|
2913
PUT
BRC Group Holdings
RILY
$277M
| $874K | ﹤0.01% |
294,300
-22,400
| -7% | -$68.8K |
|
|
CHGX
2914
PUT
DELISTED
AXS Change Finance ESG ETF
CHGX
| $872K | ﹤0.01% |
49,500
-27,900
| -36% | -$999K |
|
|
PPTA
2915
PUT
Perpetua Resources
PPTA
$2.23B
| $868K | ﹤0.01% |
71,500
+53,500
| +297% | +$721K |
|
2916
CALL
RPM International
RPM
$13.7B
| $867K | ﹤0.01% |
7,900
+3,000
| +61% | +$330K |
|
2917
CALL
Ecopetrol
EC
$32.9B
| $866K | ﹤0.01% |
97,900
+17,300
| +21% | +$153K |
|
2918
Worthington Enterprises
WOR
$2.76B
| $866K | ﹤0.01% |
13,613
+5,026
| +59% | +$278K |
|
|
KDK
2919
Kodiak AI
KDK
$802M
| $865K | ﹤0.01% |
+76,373
| New | +$861K |
|
2920
CALL
Check Point Software Technologies
CHKP
$13.3B
| $862K | ﹤0.01% |
3,900
-45,000
| -92% | -$9.9M |
|
2921
Boston Properties
BXP
$11B
| $860K | ﹤0.01% |
12,755
-599
| -4% | -$39.9K |
|
2922
Corteva
CTVA
$59.7B
| $860K | ﹤0.01% |
+11,544
| New | +$769K |
|
2923
PUT
Ashland
ASH
$3.04B
| $859K | ﹤0.01% |
17,100
-1,200
| -7% | -$61K |
|
2924
Direxion Daily NYSE FANG+ Bull 2X ETF
FNGG
$115M
| $859K | ﹤0.01% |
4,022
+4,019
| +133,967% | +$661K |
|
2925
PUT
Cerence
CRNC
$382M
| $858K | ﹤0.01% |
84,100
+34,200
| +69% | +$301K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.