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 | |
|---|---|---|---|---|---|---|
4676
PUT
Helix Energy Solutions
HLX
$1.34B
| $147K | ﹤0.01% |
+13,200
| New | +$127K |
|
4677
Icon
ICLR
$13.7B
| $147K | ﹤0.01% |
+599
| New | +$151K |
|
4678
Ironwood Pharmaceuticals
IRWD
$586M
| $147K | ﹤0.01% |
15,318
+7,372
| +93% | +$72.3K |
|
4679
RBC Bearings
RBC
$17.4B
| $147K | ﹤0.01% |
629
-1,489
| -70% | -$338K |
|
4680
PUT
CryoPort
CYRX
$753M
| $146K | ﹤0.01% |
10,700
+8,400
| +365% | +$124K |
|
|
EEX
4681
CALL
DELISTED
Emerald Holding
EEX
| $146K | ﹤0.01% |
+32,400
| New | +$137K |
|
4682
PUT
Eldorado Gold
EGO
$8.33B
| $146K | ﹤0.01% |
16,400
+6,500
| +66% | +$63.3K |
|
4683
CALL
Insperity
NSP
$2.03B
| $146K | ﹤0.01% |
1,500
-7,700
| -84% | -$805K |
|
4684
CALL
U-Haul Holding Co Series N
UHAL.B
$12.4B
| $146K | ﹤0.01% |
2,700
+2,000
| +286% | +$109K |
|
4685
PUT
Apogee Enterprises
APOG
$833M
| $145K | ﹤0.01% |
3,100
+3,000
| +3,000% | +$146K |
|
4686
CALL
Biomea Fusion
BMEA
$88.2M
| $145K | ﹤0.01% |
10,600
-55,400
| -84% | -$999K |
|
4687
United States Copper Index Fund
CPER
$742M
| $145K | ﹤0.01% |
6,324
-4,841
| -43% | -$113K |
|
4688
CALL
Carter's
CRI
$1.43B
| $145K | ﹤0.01% |
2,100
-500
| -19% | -$35.7K |
|
4689
CapForce IBD 50 ETF
FFTY
$78.8M
| $145K | ﹤0.01% |
6,511
+6,111
| +1,528% | +$148K |
|
4690
iShares Global Clean Energy ETF
ICLN
$2.22B
| $145K | ﹤0.01% |
9,952
-4,298
| -30% | -$72.1K |
|
4691
PUT
Loews
L
$24.5B
| $145K | ﹤0.01% |
2,300
+200
| +10% | +$12.5K |
|
4692
CALL
Lazard
LAZ
$3.96B
| $145K | ﹤0.01% |
4,700
+200
| +4% | +$6.7K |
|
4693
CALL
LSB Industries
LXU
$824M
| $145K | ﹤0.01% |
14,200
-10,700
| -43% | -$111K |
|
4694
CALL
Medpace
MEDP
$16.3B
| $145K | ﹤0.01% |
600
-1,000
| -63% | -$256K |
|
4695
CALL
RCI Hospitality Holdings
RICK
$202M
| $145K | ﹤0.01% |
2,400
-900
| -27% | -$60.3K |
|
4696
Seanergy Maritime Holdings
SHIP
$349M
| $145K | ﹤0.01% |
26,358
+25,968
| +6,658% | +$138K |
|
4697
CALL
SkyWater Technology
SKYT
$1.5B
| $145K | ﹤0.01% |
24,200
+20,600
| +572% | +$156K |
|
4698
PUT
Sylvamo
SLVM
$1.52B
| $145K | ﹤0.01% |
3,300
+2,500
| +313% | +$107K |
|
4699
PUT
Telesat
TSAT
$524M
| $145K | ﹤0.01% |
10,200
+7,000
| +219% | +$95.1K |
|
4700
State Street SPDR S&P Semiconductor ETF
XSD
$2.51B
| $145K | ﹤0.01% |
+741
| New | +$157K |
|
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.