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 | |
|---|---|---|---|---|---|---|
676
PUT
Chewy
CHWY
$8.38B
| $18.4M | 0.01% |
455,700
+172,200
| +61% | +$6.64M |
|
677
PUT
Diamondback Energy
FANG
$57.8B
| $18.4M | 0.01% |
128,700
+60,100
| +88% | +$8.55M |
|
678
PUT
Lumentum
LITE
$64.9B
| $18.4M | 0.01% |
113,100
+47,700
| +73% | +$5.95M |
|
679
PUT
Eaton
ETN
$161B
| $18.3M | 0.01% |
49,000
+6,100
| +14% | +$2.22M |
|
680
PUT
McKesson
MCK
$96.5B
| $18.3M | 0.01% |
23,700
+14,500
| +158% | +$10.2M |
|
681
CALL
Franco-Nevada
FNV
$41.3B
| $18.3M | 0.01% |
82,000
+39,200
| +92% | +$7.06M |
|
682
PUT
BP
BP
$113B
| $18.1M | 0.01% |
526,200
-116,500
| -18% | -$3.9M |
|
683
CALL
Crocs
CROX
$6.58B
| $18.1M | 0.01% |
216,500
+170,000
| +366% | +$15.5M |
|
684
CALL
Thermo Fisher Scientific
TMO
$213B
| $18M | 0.01% |
37,100
-13,100
| -26% | -$6.1M |
|
685
CALL
Twilio
TWLO
$28.1B
| $18M | 0.01% |
179,400
-7,400
| -4% | -$833K |
|
686
PUT
Lumen
LUMN
$6.73B
| $18M | 0.01% |
2,933,400
+463,600
| +19% | +$2.23M |
|
687
PUT
Fidelity Wise Origin Bitcoin Fund
FBTC
$12B
| $17.9M | 0.01% |
179,600
+78,900
| +78% | +$7.88M |
|
688
PUT
EOG Resources
EOG
$77.5B
| $17.9M | 0.01% |
159,800
+29,800
| +23% | +$3.55M |
|
689
PUT
Cleveland-Cliffs
CLF
$6.25B
| $17.9M | 0.01% |
1,465,900
+533,400
| +57% | +$5.61M |
|
|
HUT
690
PUT
Hut 8
HUT
$13.2B
| $17.8M | 0.01% |
512,500
+25,900
| +5% | +$658K |
|
691
PUT
Fair Isaac
FICO
$28B
| $17.8M | 0.01% |
11,900
+3,200
| +37% | +$4.81M |
|
692
PUT
Dollar Tree
DLTR
$22.6B
| $17.8M | 0.01% |
188,500
-66,800
| -26% | -$7.15M |
|
693
PUT
Dollar General
DG
$25.4B
| $17.8M | 0.01% |
171,900
-95,900
| -36% | -$10.5M |
|
694
CALL
SiriusXM
SIRI
$10.1B
| $17.7M | 0.01% |
762,500
+8,100
| +1% | +$187K |
|
695
PUT
Nucor
NUE
$54.9B
| $17.6M | 0.01% |
130,100
-61,100
| -32% | -$8.65M |
|
696
Freeport-McMoran
FCX
$91.3B
| $17.5M | 0.01% |
+447,211
| New | +$19.4M |
|
697
CALL
Cheniere Energy
LNG
$57B
| $17.5M | 0.01% |
74,400
-103,200
| -58% | -$24.3M |
|
698
CALL
American Eagle Outfitters
AEO
$2.86B
| $17.4M | 0.01% |
1,019,200
+731,200
| +254% | +$10M |
|
699
PUT
HCA Healthcare
HCA
$83.5B
| $17.4M | 0.01% |
40,800
+5,400
| +15% | +$2.09M |
|
700
PUT
On Holding
ONON
$11.6B
| $17.4M | 0.01% |
409,900
-6,600
| -2% | -$314K |
|
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.