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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4901
PUT
QuickLogic
QUIK
$232M
| $193K | ﹤0.01% |
12,100
+8,300
| +218% | +$119K |
|
4902
CALL
RLI Corp
RLI
$5.62B
| $193K | ﹤0.01% |
2,600
+600
| +30% | +$42.8K |
|
4903
PUT
Eos Energy Enterprises
EOSE
$1.23B
| $192K | ﹤0.01% |
186,700
-175,300
| -48% | -$178K |
|
4904
iShares US Oil & Gas Exploration & Production ETF
IEO
$580M
| $192K | ﹤0.01% |
1,800
+682
| +61% | +$65K |
|
|
PCH
4905
CALL
DELISTED
PotlatchDeltic
PCH
| $192K | ﹤0.01% |
4,100
-200
| -5% | -$9.21K |
|
4906
CALL
Palomar
PLMR
$3.57B
| $192K | ﹤0.01% |
2,300
-6,300
| -73% | -$432K |
|
4907
AerSale
ASLE
$292M
| $191K | ﹤0.01% |
26,702
-49,659
| -65% | -$458K |
|
|
CWAN
4908
CALL
DELISTED
Clearwater Analytics
CWAN
| $191K | ﹤0.01% |
10,800
-21,300
| -66% | -$396K |
|
4909
CALL
Kulicke & Soffa
KLIC
$4.69B
| $191K | ﹤0.01% |
3,800
-14,600
| -79% | -$730K |
|
4910
PUT
KLX Energy Services
KLXE
$44.8M
| $191K | ﹤0.01% |
24,800
+22,800
| +1,140% | +$204K |
|
4911
iShares Global Timber & Forestry ETF
WOOD
$268M
| $191K | ﹤0.01% |
2,274
+1,872
| +466% | +$147K |
|
4912
PUT
Atmos Energy
ATO
$28.9B
| $190K | ﹤0.01% |
1,600
+1,300
| +433% | +$149K |
|
4913
KLA
KLAC
$240B
| $190K | ﹤0.01% |
+2,720
| New | +$175K |
|
4914
MidCap Financial Investment
MFIC
$785M
| $190K | ﹤0.01% |
+12,659
| New | +$180K |
|
4915
PUT
Redwire
RDW
$2.06B
| $190K | ﹤0.01% |
43,400
-46,000
| -51% | -$146K |
|
4916
PUT
Safe Bulkers
SB
$798M
| $190K | ﹤0.01% |
38,400
+17,100
| +80% | +$75.3K |
|
4917
TTEC Holdings
TTEC
$121M
| $190K | ﹤0.01% |
18,360
+18,013
| +5,191% | +$302K |
|
4918
B&G Foods
BGS
$287M
| $189K | ﹤0.01% |
16,544
-8,204
| -33% | -$85.9K |
|
4919
CALL
BRC Inc
BRCC
$122M
| $189K | ﹤0.01% |
44,300
+25,900
| +141% | +$107K |
|
4920
Louisiana-Pacific
LPX
$5.05B
| $189K | ﹤0.01% |
+2,262
| New | +$163K |
|
4921
CALL
abrdn Physical Gold Shares ETF
SGOL
$6.91B
| $189K | ﹤0.01% |
8,900
+7,000
| +368% | +$139K |
|
|
EVA
4922
PUT
DELISTED
Enviva Inc.
EVA
| $189K | ﹤0.01% |
429,800
+400,200
| +1,352% | +$210K |
|
4923
CALL
United States Copper Index Fund
CPER
$766M
| $188K | ﹤0.01% |
7,500
-1,200
| -14% | -$28.9K |
|
|
FRGE
4924
CALL
DELISTED
Forge Global Holdings
FRGE
| $188K | ﹤0.01% |
6,513
+2,713
| +71% | +$84.7K |
|
4925
CALL
Kayne Anderson Energy Infrastructure Fund
KYN
$2.47B
| $188K | ﹤0.01% |
+18,800
| New | +$170K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.