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 | |
|---|---|---|---|---|---|---|
826
CALL
Barclays
BCS
$93.5B
| $11M | 0.01% |
592,400
+135,600
| +30% | +$2.24M |
|
827
CALL
Maplebear
CART
$9.98B
| $11M | 0.01% |
243,000
-30,900
| -11% | -$1.34M |
|
828
CALL
Plains All American Pipeline
PAA
$17.4B
| $11M | 0.01% |
599,600
+126,100
| +27% | +$2.2M |
|
829
CALL
Sempra
SRE
$61.1B
| $11M | 0.01% |
144,900
-90,900
| -39% | -$6.75M |
|
830
PUT
Kroger
KR
$34.1B
| $10.9M | 0.01% |
152,400
-3,900
| -2% | -$269K |
|
831
AST SpaceMobile
ASTS
$17.7B
| $10.9M | 0.01% |
233,885
-75,213
| -24% | -$2.18M |
|
832
Humana
HUM
$47.1B
| $10.9M | 0.01% |
44,637
-17,035
| -28% | -$4.25M |
|
833
CALL
Return Stacked Bonds & Managed Futures ETF
RSBT
$136M
| $10.9M | 0.01% |
513,300
+96,700
| +23% | +$1.54M |
|
834
CALL
BWX Technologies
BWXT
$16.4B
| $10.9M | 0.01% |
75,700
+18,800
| +33% | +$2.2M |
|
835
PUT
Constellation Brands
STZ
$22.1B
| $10.9M | 0.01% |
67,000
+100
| +0.1% | +$17.9K |
|
836
CALL
LyondellBasell Industries
LYB
$19.9B
| $10.9M | 0.01% |
188,300
+27,500
| +17% | +$1.6M |
|
837
CALL
Canadian Imperial Bank of Commerce
CM
$106B
| $10.9M | 0.01% |
153,700
-37,500
| -20% | -$2.41M |
|
838
CALL
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$166M
| $10.9M | 0.01% |
226,200
-178,600
| -44% | -$10.5M |
|
|
839
PUT
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$166M
| $10.9M | 0.01% |
226,000
-126,300
| -36% | -$7.43M |
|
|
ECHO
840
CALL
EchoStar
ECHO
$26.3B
| $10.8M | 0.01% |
391,500
+245,000
| +167% | +$5.38M |
|
841
Target
TGT
$61.1B
| $10.8M | 0.01% |
109,894
+31,793
| +41% | +$3.05M |
|
842
CALL
SentinelOne
S
$6.04B
| $10.8M | 0.01% |
593,000
+121,500
| +26% | +$2.22M |
|
843
PUT
Lumen
LUMN
$6.77B
| $10.8M | 0.01% |
2,469,800
+129,400
| +6% | +$501K |
|
844
CALL
Ciena
CIEN
$57.9B
| $10.8M | 0.01% |
132,900
-86,200
| -39% | -$6.18M |
|
845
SLB Ltd
SLB
$70.9B
| $10.8M | 0.01% |
318,601
+58,562
| +23% | +$2.03M |
|
846
PUT
Atmos Energy
ATO
$29.8B
| $10.8M | 0.01% |
69,800
-300
| -0.4% | -$46.6K |
|
847
PUT
Celestica
CLS
$39.6B
| $10.7M | 0.01% |
68,600
-40,400
| -37% | -$4.29M |
|
848
PUT
Live Nation Entertainment
LYV
$41.1B
| $10.7M | 0.01% |
70,600
-123,300
| -64% | -$17M |
|
849
Baidu
BIDU
$36.2B
| $10.7M | 0.01% |
124,357
-204,568
| -62% | -$17.7M |
|
850
PUT
Edwards Lifesciences
EW
$48.2B
| $10.6M | 0.01% |
136,100
+39,800
| +41% | +$2.97M |
|
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.