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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
1351
CALL
DocuSign
DOCU
$15B
| $3.92M | ﹤0.01% |
58,400
-81,400
| -58% | -$4.84M |
2021 Q1
22 quarters
|
|
1352
CALL
Defiance Daily Target 2X Long RGTI ETF
RGTX
$19.3M
| $3.92M | ﹤0.01% |
212,800
+92,200
| +76% | +$1.03M |
2026 Q1
2 quarters
|
|
1353
PUT
Webull Corp
BULL
$2.73B
| $3.91M | ﹤0.01% |
560,600
+160,600
| +40% | +$1.28M |
2025 Q2
5 quarters
|
|
1354
PUT
Crocs
CROX
$7.32B
| $3.91M | ﹤0.01% |
33,300
-7,200
| -18% | -$909K |
2018 Q2
33 quarters
|
|
1355
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$10.7M
| $3.9M | ﹤0.01% |
75,500
+24,100
| +47% | +$981K |
2015 Q3
44 quarters
|
|
1356
Best Buy
BBY
$22.1B
| $3.89M | ﹤0.01% |
44,115
+17,871
| +68% | +$1.54M |
2026 Q2
1 quarter
|
|
1357
NIO
NIO
$8.12B
| $3.89M | ﹤0.01% |
1,134,510
+226,752
| +25% | +$988K |
2026 Q2
1 quarter
|
|
1358
CALL
Aflac
AFL
$62.9B
| $3.89M | ﹤0.01% |
34,800
-42,400
| -55% | -$5.08M |
2015 Q1
46 quarters
|
|
|
1359
CALL
Best Buy
BBY
$22.1B
| $3.88M | ﹤0.01% |
44,000
-4,300
| -9% | -$371K |
2021 Q2
21 quarters
|
|
1360
PUT
Veeva Systems
VEEV
$49.3B
| $3.88M | ﹤0.01% |
13,600
+7,300
| +116% | +$1.72M |
2016 Q2
41 quarters
|
|
1361
CALL
Breakwave Tanker Shipping ETF
BWET
$76.1M
| $3.88M | ﹤0.01% |
12,000
+9,600
| +400% | +$4.03M |
2025 Q3
4 quarters
|
|
1362
CALL
Gold Fields
GFI
$33.2B
| $3.88M | ﹤0.01% |
107,400
+86,600
| +416% | +$3.4M |
2017 Q3
36 quarters
|
|
1363
PUT
VICI Properties
VICI
$27.5B
| $3.88M | ﹤0.01% |
168,800
+121,300
| +255% | +$3.12M |
2019 Q1
30 quarters
|
|
1364
CALL
Fermi Inc
FRMI
$1.16B
| $3.87M | ﹤0.01% |
920,200
+200,000
| +28% | +$1.18M |
2025 Q4
3 quarters
|
|
1365
PUT
Sarepta Therapeutics
SRPT
$1.79B
| $3.87M | ﹤0.01% |
212,500
+59,500
| +39% | +$1.11M |
2021 Q2
21 quarters
|
|
1366
CALL
Quantum Computing Inc
QUBT
$1.4B
| $3.87M | ﹤0.01% |
457,500
-118,400
| -21% | -$998K |
2021 Q4
19 quarters
|
|
1367
PUT
Johnson Controls International
JCI
$87.6B
| $3.86M | ﹤0.01% |
26,000
-16,700
| -39% | -$2.42M |
2014 Q4
47 quarters
|
|
1368
argenx
ARGX
$61.5B
| $3.86M | ﹤0.01% |
4,026
+2,330
| +137% | +$2.19M |
2025 Q2
5 quarters
|
|
1369
PUT
MetLife
MET
$64.7B
| $3.86M | ﹤0.01% |
41,000
-16,300
| -28% | -$1.55M |
2014 Q4
47 quarters
|
|
1370
CALL
Golar LNG
GLNG
$4.37B
| $3.85M | ﹤0.01% |
81,000
+6,500
| +9% | +$329K |
2014 Q4
47 quarters
|
|
1371
PUT
Solaris Energy Infrastructure
SEI
$4.5B
| $3.84M | ﹤0.01% |
54,000
+25,500
| +89% | +$1.55M |
2024 Q1
10 quarters
|
|
1372
CALL
Energy Vault
NRGV
$704M
| $3.84M | ﹤0.01% |
966,600
+198,300
| +26% | +$728K |
2025 Q3
4 quarters
|
|
1373
PUT
QuantumScape Corp
QS
$2.61B
| $3.83M | ﹤0.01% |
825,100
+212,400
| +35% | +$1.21M |
2020 Q3
24 quarters
|
|
1374
Ciena
CIEN
$42B
| $3.83M | ﹤0.01% |
10,889
+6,227
| +134% | +$2.4M |
2026 Q2
1 quarter
|
|
1375
CALL
Grayscale Ethereum Staking Mini ETF Shares
ETH
$1.75B
| $3.83M | ﹤0.01% |
150,200
+105,300
| +235% | +$2.18M |
2026 Q1
2 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.