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 | |
|---|---|---|---|---|---|---|
3526
PUT
Essex Property Trust
ESS
$19B
| $445K | ﹤0.01% |
2,100
+400
| +24% | +$93.8K |
|
3527
CALL
Alliant Energy
LNT
$19.2B
| $445K | ﹤0.01% |
9,200
-2,700
| -23% | -$140K |
|
3528
PUT
Eastman Chemical
EMN
$7.84B
| $444K | ﹤0.01% |
5,800
-31,500
| -84% | -$2.61M |
|
3529
Pliant Therapeutics
PLRX
$67.5M
| $444K | ﹤0.01% |
+25,606
| New | +$444K |
|
3530
CALL
SurgePays
SURG
$6.03M
| $444K | ﹤0.01% |
95,000
+65,300
| +220% | +$339K |
|
3531
PUT
Carlyle Secured Lending
CGBD
$714M
| $443K | ﹤0.01% |
30,600
-6,700
| -18% | -$100K |
|
3532
Guardant Health
GH
$19.1B
| $443K | ﹤0.01% |
+14,973
| New | +$527K |
|
3533
CALL
Kimco Realty
KIM
$17.9B
| $443K | ﹤0.01% |
25,200
-12,200
| -33% | -$237K |
|
3534
CALL
Mettler-Toledo International
MTD
$27.9B
| $443K | ﹤0.01% |
400
+200
| +100% | +$245K |
|
3535
PUT
Public Service Enterprise Group
PEG
$39.6B
| $443K | ﹤0.01% |
7,800
-13,200
| -63% | -$811K |
|
3536
Direxion Daily MSCI Brazil Bull 2X ETF
BRZU
$103M
| $442K | ﹤0.01% |
5,720
+1,108
| +24% | +$93.9K |
|
3537
CALL
StealthGas
GASS
$330M
| $442K | ﹤0.01% |
87,900
+87,300
| +14,550% | +$424K |
|
3538
PUT
Alta Equipment Group
ALTG
$210M
| $441K | ﹤0.01% |
36,600
+4,400
| +14% | +$65.8K |
|
|
TBCH
3539
PUT
Turtle Beach Corp
TBCH
$254M
| $441K | ﹤0.01% |
48,700
-156,400
| -76% | -$1.68M |
|
3540
Canadian National Railway
CNI
$78B
| $440K | ﹤0.01% |
4,066
+1,519
| +60% | +$174K |
|
3541
PUT
Carlisle Companies
CSL
$14B
| $440K | ﹤0.01% |
1,700
+1,200
| +240% | +$322K |
|
|
HDSN
3542
PUT
Hudson Technologies
HDSN
$262M
| $440K | ﹤0.01% |
33,100
+23,800
| +256% | +$257K |
|
3543
Ternium
TX
$9.67B
| $439K | ﹤0.01% |
+11,011
| New | +$454K |
|
3544
CALL
Corcept Therapeutics
CORT
$9.91B
| $438K | ﹤0.01% |
16,100
+15,800
| +5,267% | +$457K |
|
|
SRCL
3545
CALL
DELISTED
Stericycle Inc
SRCL
| $438K | ﹤0.01% |
9,800
+4,000
| +69% | +$179K |
|
3546
PUT
Kulicke & Soffa
KLIC
$4.7B
| $437K | ﹤0.01% |
9,000
+600
| +7% | +$31.8K |
|
3547
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$10.7B
| $437K | ﹤0.01% |
+16,736
| New | +$471K |
|
3548
Tradr 1.25X NVDA Bear Daily ETF
NVDS
$16.5M
| $436K | ﹤0.01% |
735
+729
| +12,150% | +$424K |
|
3549
PUT
Orion
OEC
$403M
| $436K | ﹤0.01% |
20,500
-64,200
| -76% | -$1.4M |
|
3550
CALL
Omnicell
OMCL
$1.95B
| $436K | ﹤0.01% |
9,700
+7,300
| +304% | +$442K |
|
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.