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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 | |
|---|---|---|---|---|---|---|---|
451
CALL
Applied Optoelectronics
AAOI
$4.35B
| $20.9M | 0.01% |
210,100
+47,300
| +29% | +$5.31M |
2016 Q2
41 quarters
|
|
452
CALL
Teradyne
TER
$38.1B
| $20.7M | 0.01% |
51,700
-2,500
| -5% | -$922K |
2016 Q4
39 quarters
|
|
453
PUT
Alcoa
AA
$10.5B
| $20.6M | 0.01% |
491,200
+22,500
| +5% | +$1.07M |
2015 Q1
46 quarters
|
|
454
CALL
Wayfair
W
$15.2B
| $20.5M | 0.01% |
200,200
+38,600
| +24% | +$3.77M |
2017 Q1
38 quarters
|
|
455
Citigroup
C
$202B
| $20.4M | 0.01% |
157,546
+129,617
| +464% | +$17.5M |
2026 Q1
2 quarters
|
|
456
State Street Technology Select Sector SPDR ETF
XLK
$112B
| $20.3M | 0.01% |
103,760
+70,971
| +216% | +$13.1M |
2025 Q1
6 quarters
|
|
457
CALL
Ross Stores
ROST
$75.8B
| $20.2M | 0.01% |
86,700
+75,200
| +654% | +$17.6M |
2014 Q4
47 quarters
|
|
458
PUT
DigitalOcean
DOCN
$9.39B
| $20.2M | 0.01% |
151,500
+25,900
| +21% | +$3.26M |
2021 Q2
21 quarters
|
|
459
CALL
Fidelity Wise Origin Bitcoin Fund
FBTC
$13.6B
| $20.1M | 0.01% |
277,200
-21,100
| -7% | -$1.31M |
2026 Q1
2 quarters
|
|
460
CALL
Etsy
ETSY
$7.38B
| $20.1M | 0.01% |
281,100
+73,400
| +35% | +$5.8M |
2015 Q2
45 quarters
|
|
461
PUT
Akamai
AKAM
$12.1B
| $20.1M | 0.01% |
188,800
+36,200
| +24% | +$4.14M |
2021 Q2
21 quarters
|
|
462
CALL
Beyond Meat
BYND
$103M
| $20M | 0.01% |
2,420,800
+2,336,503
| +2,772% | +$34.1M |
2021 Q1
22 quarters
|
|
463
CALL
Amplify Online Retail ETF
IBUY
$125M
| $20M | 0.01% |
730,300
+205,700
| +39% | +$14.6M |
2018 Q1
34 quarters
|
|
464
PUT
HP
HPQ
$25.7B
| $19.9M | 0.01% |
637,700
-162,200
| -20% | -$4.68M |
2021 Q2
21 quarters
|
|
465
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$484M
| $19.9M | 0.01% |
834,900
+179,400
| +27% | +$3.78M |
2018 Q1
34 quarters
|
|
466
CALL
ON Semiconductor
ON
$27B
| $19.9M | 0.01% |
259,300
+69,000
| +36% | +$5.54M |
2021 Q2
21 quarters
|
|
467
GE Vernova
GEV
$207B
| $19.8M | 0.01% |
20,878
+526
| +3% | +$521K |
2025 Q4
3 quarters
|
|
468
CALL
D-Wave Quantum Inc
QBTS
$3.91B
| $19.8M | 0.01% |
1,194,600
+513,000
| +75% | +$9.49M |
2023 Q2
13 quarters
|
|
|
469
CALL
ProShares Ultra Bloomberg Natural Gas
BOIL
$484M
| $19.6M | 0.01% |
761,800
-387,600
| -34% | -$8.16M |
2020 Q2
25 quarters
|
|
470
PUT
Semtech
SMTC
$10.4B
| $19.6M | 0.01% |
109,800
+9,300
| +9% | +$1.32M |
2018 Q2
33 quarters
|
|
471
PUT
Novartis
NVS
$309B
| $19.5M | 0.01% |
137,100
+83,200
| +154% | +$12.6M |
2014 Q4
47 quarters
|
|
472
PUT
Natera
NTRA
$45.4B
| $19.4M | 0.01% |
46,900
+16,100
| +52% | +$5.06M |
2018 Q4
31 quarters
|
|
473
PUT
Hims & Hers Health
HIMS
$4.39B
| $19.3M | 0.01% |
648,400
-215,000
| -25% | -$6.6M |
2021 Q1
22 quarters
|
|
474
PUT
GE Aerospace
GE
$350B
| $19.3M | 0.01% |
61,800
-123,300
| -67% | -$42.7M |
2014 Q4
47 quarters
|
|
475
CALL
Booking.com
BKNG
$120B
| $19.3M | 0.01% |
118,300
+500
| +0.4% | +$94K |
2021 Q2
21 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.