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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
501
CALL
Apollo Global Management
APO
$68.6B
| $28.6M | 0.01% |
214,900
-120,400
| -36% | -$17M |
|
502
PUT
Seagate
STX
$205B
| $28.6M | 0.01% |
121,300
-37,700
| -24% | -$6.43M |
|
503
CALL
McKesson
MCK
$95.3B
| $28.4M | 0.01% |
36,800
+26,600
| +261% | +$18.7M |
|
|
TLN
504
CALL
Talen Energy Corp
TLN
$18B
| $28.4M | 0.01% |
66,800
+32,900
| +97% | +$11.9M |
|
505
CALL
Johnson Controls International
JCI
$86.9B
| $28.4M | 0.01% |
258,100
+163,100
| +172% | +$17.4M |
|
506
CALL
Direxion Daily MSCI Emerging Markets Bear 3X ETF
EDZ
$17.1M
| $28.2M | 0.01% |
+696,200
| New | +$33.8M |
|
|
BULL
507
CALL
Webull Corp
BULL
$4.31B
| $28.1M | 0.01% |
1,901,800
+1,428,200
| +302% | +$20.4M |
|
508
CALL
Medtronic
MDT
$105B
| $28.1M | 0.01% |
294,900
-190,200
| -39% | -$17.5M |
|
509
PUT
Upstart Holdings
UPST
$2.74B
| $28M | 0.01% |
551,700
+178,500
| +48% | +$12.6M |
|
510
PUT
Regeneron Pharmaceuticals
REGN
$68.3B
| $28M | 0.01% |
49,800
+7,800
| +19% | +$4.41M |
|
|
EXE
511
CALL
Expand Energy Corp
EXE
$22.3B
| $27.9M | 0.01% |
262,800
-13,800
| -5% | -$1.38M |
|
512
CALL
Danaher
DHR
$127B
| $27.9M | 0.01% |
140,900
-70,700
| -33% | -$14.1M |
|
|
AXON
513
PUT
Axon Enterprise
AXON
$39.6B
| $27.8M | 0.01% |
38,700
+7,500
| +24% | +$5.69M |
|
514
PUT
Zscaler
ZS
$23B
| $27.7M | 0.01% |
92,300
-41,500
| -31% | -$11.8M |
|
515
CALL
CSX Corp
CSX
$92.8B
| $27.7M | 0.01% |
778,700
+207,800
| +36% | +$7.1M |
|
516
CALL
Amplify Online Retail ETF
IBUY
$108M
| $27.6M | 0.01% |
1,181,800
+562,100
| +91% | +$41.1M |
|
517
CALL
Halliburton
HAL
$27.6B
| $27.6M | 0.01% |
1,120,900
+178,900
| +19% | +$3.96M |
|
|
518
PUT
CSX Corp
CSX
$92.8B
| $27.5M | 0.01% |
775,100
+350,100
| +82% | +$12M |
|
|
SHNY
519
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $27.5M | 0.01% |
1,000,200
+165,600
| +20% | +$4.55M |
|
520
CALL
Archer Aviation
ACHR
$3.95B
| $27.4M | 0.01% |
2,860,500
-452,300
| -14% | -$4.48M |
|
521
PUT
D.R. Horton
DHI
$40.4B
| $27.4M | 0.01% |
161,600
+57,600
| +55% | +$9.06M |
|
522
CALL
Altria Group
MO
$121B
| $27.2M | 0.01% |
412,500
-167,800
| -29% | -$10.6M |
|
523
PUT
Nu Holdings
NU
$70.1B
| $27.2M | 0.01% |
1,696,800
-1,178,100
| -41% | -$16.4M |
|
524
PUT
Sharplink Inc
SBET
$1.33B
| $27.1M | 0.01% |
1,590,500
+1,447,600
| +1,013% | +$28.4M |
|
525
PUT
Estee Lauder
EL
$29.9B
| $26.9M | 0.01% |
305,800
+51,900
| +20% | +$4.62M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.