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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
7651
PUT
Kforce
KFRC
$1.02B
| $5K | ﹤0.01% |
+100
| New | +$6.09K |
|
|
KNDI
7652
PUT
Kandi Technologies Group
KNDI
$66.3M
| $5K | ﹤0.01% |
1,600
-1,700
| -52% | -$5.98K |
|
7653
Kopin
KOPN
$689M
| $5K | ﹤0.01% |
4,138
-9,109
| -69% | -$14.8K |
|
7654
CALL
KT
KT
$8.85B
| $5K | ﹤0.01% |
400
-2,700
| -87% | -$32.5K |
|
7655
PUT
Kymera Therapeutics
KYMR
$9.23B
| $5K | ﹤0.01% |
400
-200
| -33% | -$4.02K |
|
7656
PUT
Leslie's
LESL
$12.3M
| $5K | ﹤0.01% |
45
-625
| -93% | -$81.8K |
|
7657
CALL
Mistras Group
MG
$495M
| $5K | ﹤0.01% |
1,100
-3,100
| -74% | -$19.5K |
|
7658
PUT
Martin Midstream Partners
MMLP
$97.8M
| $5K | ﹤0.01% |
2,000
| – | – |
|
7659
PUT
MGIC Investment
MTG
$6.31B
| $5K | ﹤0.01% |
300
-2,900
| -91% | -$49.3K |
|
7660
CALL
Myers Industries
MYE
$1.2B
| $5K | ﹤0.01% |
300
| – | – |
|
7661
NewMarket
NEU
$7.17B
| $5K | ﹤0.01% |
+12
| New | +$5.42K |
|
|
NEWP
7662
CALL
New Pacific Metals
NEWP
$855M
| $5K | ﹤0.01% |
2,900
+600
| +26% | +$1.41K |
|
7663
PUT
National Health Investors
NHI
$3.85B
| $5K | ﹤0.01% |
100
-1,600
| -94% | -$83.7K |
|
7664
InspireMD
NSPR
$32.3M
| $5K | ﹤0.01% |
+1,782
| New | +$5.69K |
|
7665
CALL
NetSol Technologies
NTWK
$51.8M
| $5K | ﹤0.01% |
+3,200
| New | +$7.14K |
|
7666
PUT
Ocular Therapeutix
OCUL
$1.93B
| $5K | ﹤0.01% |
1,900
-20,600
| -92% | -$84.3K |
|
7667
PAVmed
PAVM
$36.9M
| $5K | ﹤0.01% |
41
+3
| +8% | +$465 |
|
7668
CALL
Puma Biotechnology
PBYI
$416M
| $5K | ﹤0.01% |
2,200
-21,100
| -91% | -$71.9K |
|
7669
PUT
Performance Food Group
PFGC
$17.8B
| $5K | ﹤0.01% |
100
-300
| -75% | -$18.1K |
|
7670
PennantPark Floating Rate Capital
PFLT
$692M
| $5K | ﹤0.01% |
482
-397
| -45% | -$4.28K |
|
7671
Porch Group
PRCH
$1.37B
| $5K | ﹤0.01% |
6,854
-8,305
| -55% | -$8.73K |
|
|
PRPH
7672
CALL
DELISTED
ProPhase Labs
PRPH
| $5K | ﹤0.01% |
130
-120
| -48% | -$7.03K |
|
7673
PUT
Protagonist Therapeutics
PTGX
$8.97B
| $5K | ﹤0.01% |
300
-12,200
| -98% | -$237K |
|
7674
PUT
RCM Technologies
RCMT
$197M
| $5K | ﹤0.01% |
300
-100
| -25% | -$1.96K |
|
|
REE
7675
CALL
DELISTED
REE Automotive
REE
| $5K | ﹤0.01% |
1,227
-1,403
| -53% | -$10.7K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.