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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 | |
|---|---|---|---|---|---|---|---|
401
PUT
DoorDash
DASH
$76.7B
| $25.2M | 0.01% |
137,200
+10,000
| +8% | +$2.02M |
2020 Q4
23 quarters
|
|
402
CALL
Union Pacific
UNP
$178B
| $25.1M | 0.01% |
92,100
-1,700
| -2% | -$494K |
2021 Q2
21 quarters
|
|
403
PUT
DELISTED
Warner Bros
WBD
| $25M | 0.01% |
807,700
+381,200
| +89% | +$10.6M |
2022 Q2
17 quarters
|
|
404
PUT
Constellation Energy
CEG
$94.3B
| $24.8M | 0.01% |
97,800
-26,200
| -21% | -$7M |
2022 Q1
18 quarters
|
|
405
CALL
Akamai
AKAM
$12.1B
| $24.8M | 0.01% |
233,500
+77,300
| +49% | +$8.83M |
2021 Q2
21 quarters
|
|
406
PUT
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$150M
| $24.8M | 0.01% |
837,800
-156,600
| -16% | -$4.2M |
2022 Q2
17 quarters
|
|
407
CALL
Capital One
COF
$118B
| $24.4M | 0.01% |
126,300
+32,400
| +35% | +$6.8M |
2021 Q2
21 quarters
|
|
408
PUT
Texas Instruments
TXN
$274B
| $24.4M | 0.01% |
87,000
-89,400
| -51% | -$24.7M |
2021 Q1
22 quarters
|
|
409
CALL
Fortinet
FTNT
$90.4B
| $24.3M | 0.01% |
136,000
-2,000
| -1% | -$324K |
2014 Q4
47 quarters
|
|
410
PUT
ConocoPhillips
COP
$161B
| $24.3M | 0.01% |
194,100
+26,400
| +16% | +$3.27M |
2021 Q2
21 quarters
|
|
411
PUT
Amgen
AMGN
$251B
| $24.2M | 0.01% |
57,300
+8,500
| +17% | +$3.39M |
2021 Q2
21 quarters
|
|
|
412
State Street Industrial Select Sector SPDR ETF
XLI
$30.9B
| $24.1M | 0.01% |
+144,222
| New | +$25.7M |
2026 Q3
0 quarters
|
|
413
CALL
Teucrium Corn Fund
CORN
$106M
| $24M | 0.01% |
1,237,100
-616,100
| -33% | -$11.5M |
2025 Q4
3 quarters
|
|
414
PUT
JD.com
JD
$38.2B
| $23.9M | 0.01% |
898,600
+153,100
| +21% | +$4.44M |
2014 Q4
47 quarters
|
|
415
PUT
Ford
F
$49B
| $23.9M | 0.01% |
1,980,000
+451,600
| +30% | +$6.26M |
2014 Q4
47 quarters
|
|
416
CALL
Lowe's Companies
LOW
$130B
| $23.6M | 0.01% |
128,300
+67,800
| +112% | +$14.1M |
2021 Q2
21 quarters
|
|
417
CALL
Delta Air Lines
DAL
$60.6B
| $23.6M | 0.01% |
283,300
+43,700
| +18% | +$3.71M |
2021 Q2
21 quarters
|
|
418
PUT
Home Depot
HD
$350B
| $23.6M | 0.01% |
83,000
-52,400
| -39% | -$17.2M |
2021 Q2
21 quarters
|
|
419
CALL
EchoStar
ECHO
$30.1B
| $23.6M | 0.01% |
263,400
-524,900
| -67% | -$47.7M |
2023 Q2
13 quarters
|
|
420
CALL
CVS Health
CVS
$113B
| $23.4M | 0.01% |
273,000
-133,600
| -33% | -$13.1M |
2021 Q1
22 quarters
|
|
421
PUT
American Airlines Group
AAL
$9.29B
| $23.3M | 0.01% |
1,746,000
-1,037,900
| -37% | -$15.1M |
2014 Q4
47 quarters
|
|
422
PUT
Intuitive Surgical
ISRG
$156B
| $22.9M | 0.01% |
56,300
-4,000
| -7% | -$1.53M |
2014 Q4
47 quarters
|
|
423
CALL
Analog Devices
ADI
$190B
| $22.7M | 0.01% |
57,100
+16,000
| +39% | +$6.03M |
2021 Q2
21 quarters
|
|
|
424
PUT
Analog Devices
ADI
$190B
| $22.6M | 0.01% |
57,000
-15,700
| -22% | -$5.91M |
2021 Q2
21 quarters
|
|
425
CALL
Fiserv Inc
FISV
$33.7B
| $22.5M | 0.01% |
498,100
+96,200
| +24% | +$4.92M |
2021 Q1
22 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.