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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
EDR
651
CALL
DELISTED
Endeavor Group Holdings, Inc.
EDR
| $23.1M | 0.01% |
972,800
+789,900
| +432% | +$17.8M |
|
|
SHNY
652
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $23.1M | 0.01% |
1,665,800
+243,600
| +17% | +$3.38M |
|
653
CALL
Toyota
TM
$213B
| $22.9M | 0.01% |
125,000
+29,800
| +31% | +$5.43M |
|
654
PUT
Wingstop
WING
$3.76B
| $22.9M | 0.01% |
89,300
+40,600
| +83% | +$8.77M |
|
655
PUT
Mobileye
MBLY
$7.39B
| $22.9M | 0.01% |
528,300
+427,700
| +425% | +$16.8M |
|
656
PUT
XPO
XPO
$25.1B
| $22.9M | 0.01% |
266,400
+112,200
| +73% | +$9.14M |
|
657
PUT
Idexx Laboratories
IDXX
$43B
| $22.9M | 0.01% |
41,200
-700
| -2% | -$329K |
|
658
PUT
PENN Entertainment
PENN
$2.8B
| $22.9M | 0.01% |
889,100
+294,700
| +50% | +$6.83M |
|
659
Newmont
NEM
$102B
| $22.8M | 0.01% |
551,810
-108,490
| -16% | -$4.19M |
|
|
PARA
660
PUT
DELISTED
Paramount Global Class B
PARA
| $22.8M | 0.01% |
1,538,200
-332,300
| -18% | -$4.45M |
|
661
CALL
Macy's
M
$6.4B
| $22.7M | 0.01% |
1,129,400
+214,400
| +23% | +$3.1M |
|
662
CALL
NXP Semiconductors
NXPI
$70.4B
| $22.7M | 0.01% |
98,800
-20,000
| -17% | -$4.03M |
|
|
MRO
663
PUT
DELISTED
Marathon Oil Corporation
MRO
| $22.7M | 0.01% |
938,700
+344,600
| +58% | +$8.88M |
|
664
PUT
Allstate
ALL
$64.8B
| $22.6M | 0.01% |
161,600
+36,800
| +29% | +$4.8M |
|
665
Robinhood
HOOD
$93.8B
| $22.6M | 0.01% |
1,774,728
+1,366,254
| +334% | +$13.6M |
|
666
CALL
Suncor Energy
SU
$76.4B
| $22.6M | 0.01% |
705,600
-981,800
| -58% | -$32.1M |
|
667
CALL
Johnson Controls International
JCI
$86.9B
| $22.6M | 0.01% |
392,200
+25,700
| +7% | +$1.35M |
|
668
CALL
Toronto Dominion Bank
TD
$200B
| $22.4M | 0.01% |
347,100
+44,000
| +15% | +$2.64M |
|
669
CALL
AstraZeneca
AZN
$263B
| $22.3M | 0.01% |
165,500
-126,550
| -43% | -$16.5M |
|
670
PUT
Illumina
ILMN
$28.9B
| $22.2M | 0.01% |
164,069
+99,511
| +154% | +$11.5M |
|
671
PUT
Warner Bros
WBD
$64.8B
| $22.1M | 0.01% |
1,940,000
+345,100
| +22% | +$3.73M |
|
672
PUT
Scorpio Tankers
STNG
$3.9B
| $22M | 0.01% |
362,300
+135,700
| +60% | +$7.64M |
|
673
CALL
e.l.f. Beauty
ELF
$4.66B
| $22M | 0.01% |
152,600
-157,000
| -51% | -$18.1M |
|
674
CALL
Roper Technologies
ROP
$34B
| $22M | 0.01% |
40,400
-12,800
| -24% | -$6.59M |
|
675
CALL
Williams-Sonoma
WSM
$26.2B
| $22M | 0.01% |
218,200
+12,800
| +6% | +$1.11M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.